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1
Boteva, E., K. Peycheva, D. Karayasheva, D. Pashkouleva, and M. Marinova. "A Study on Fracture Resistance of Class IV Cavities Treated with Pins." Acta Medica Bulgarica 41, no. 2 (2014): 43–48. http://dx.doi.org/10.1515/amb-2014-0020.
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Summary Тhе use of pins in restoration of large cavities with esthetic resin materials appear in the dental literature after 1970 and there are less than 20 publications, focused around restorations of class IV cavities. The aim of the present study is to test the role of pins in the fracture resistance in class IV restorations with resin materials. Materials and methods: 68 matured human upper and lower sound front teeth are included in the study. The groups are upper incisors, lower incisors, canines with or without pins. All cavities are filled with the same resin material, technology and Prime bond NT. Termocycling: 30 days in 30ºС, 100% humidity, 60 days in 100% humidity 2Х12 hours at 35ºС and 40ºС and 100 dry cycles, 20 seconds each in the following order - 45ºС ± 3ºС, room temperature, 5ºС, room temperature, two series, 50 each with two days between in Cultura incubator of Viva Dent 55ºС and ice. Machine for vertical load testing ZD 10/90, load in Newtons (N), from 20 N to 1275 N, speed 0.5 mm/ min, displacement from 0.1 to 1.2 mm. Type of fractures observed: adhesive, cohesive in dentine and in resin material, mixed. Results: The highest proportion of fractures observed was in front teeth with large cavities and with pins, low loading (493-503N). Front teeth with large cavities without pins have better resistance and lower proportion of fractures (488-526N). Canines are more resistible with pins and less without. Lowest resistance is found in lower front teeth when pins are present. Conclusion: In class IV restorations when tissue loses are less than 2/3 of the incisal ridge pins can decrease the fracture resistance of the teeth.
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Saravanan, Soundaria, Chalakuzhiyil Abraham Mathew, and Biju K.A. "NEUTRAL ZONE RECORDING USING DIE PINS AND TISSUE CONDITIONER: A CASE REPORT." International Journal of Advanced Research 9, no. 03 (2021): 455–62. http://dx.doi.org/10.21474/ijar01/12604.
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The primary goal of providing complete denture prosthesis is to restore function and esthetics. Arbitrary placement of teeth may cause dislodgment during function. Neutral zone is a concept which emphasize on placing the teeth in a zone where the forces between the tongue and cheeks or lips are equal. In this case report a novel dental technique is to be discussed which uses, used die pins to retain the tissue conditioning material to record the neutral zone.
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Smith, Margaret A., Sangeeta Rao, and Jennifer E. Rawlinson. "Dental Pathology of the Domestic Pig (Sus Scrofa Domesticus)." Journal of Veterinary Dentistry 37, no. 4 (2020): 192–200. http://dx.doi.org/10.1177/0898756421989097.
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Antemortem domestic pig (Sus scrofa domesticus) dental pathology literature is sparse. This observational descriptive study evaluated 23 client-owned pigs that while sedated/anesthetized for routine annual care had intraoral dental radiographs and an oral examination performed. Age, gender, weight, and breed for each pig were recorded. Oral examination and radiographic findings were reviewed to create a comprehensive list of dental abnormalities identified. Descriptive statistics were performed to summarize the data. The study population included 14 castrated males and 20 Vietnamese pot-bellied mini-pigs. The median age was 3 years (range 2-12 years), and the median weight was 39 kg (range 11-140 kg). The most common finding was missing teeth (21/23 pigs); the first premolar tooth was the most likely to be absent (64/106 missing teeth). Periodontal disease was common (20/23 pigs). Advanced stages primarily affected the first molar teeth frequently in the form of a mucogingival defect. Supernumerary roots were discovered on the maxillary canine teeth in female pigs only (10/25 teeth with supernumerary roots). The most common persistent deciduous tooth was the maxillary second incisor (15/19 persistent deciduous teeth). Non-age or gender related open apices were most likely associated with mandibular first and second incisor teeth (26/96 teeth with open apices). Tooth resorption was also identified (7/23 pigs). The study findings prove that pet pigs commonly have dental pathology; therefore, thorough oral examinations with intraoral radiographs should be included in porcine routine health care regimens.
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Oliveira, Simone Helena Gonçalves, Lilian Costa Anami, Tânia Mara Silva, Rodrigo Simões Oliveira, Ana Luisa Leme Simões Sales, and Alberto Alvarenga Oliveira. "Intracanal reinforcement in anterior teeth to prevent fractures." Brazilian Dental Science 17, no. 3 (2014): 98. http://dx.doi.org/10.14295/bds.2014.v17i3.973.
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<p>The fracture of anterior teeth after root canal treatment is a real and multifactorial possibility. This is due to the weakening of the root due to lost of the remaining tooth added to oblique-existing occlusal forces. This fracture in addition to causing a masticatory dysfunction, will also influence the aesthetics of the patient. In prevention, one of the treatments used and widely accepted, is the use of intraradicular. These can be made of metal, carbon fiber, fiberglass and ceramics. The pins of metal and carbon fiber are very efficient but don't favor the aesthetic, as the pins fiberglass and ceramics are very resistant and favor aesthetics. Reinforcing with these biomaterials is beneficial and leads to a favorable prognosis. This study shows a case which the building could have prevented the intracanal fracture of an devitalized upper anterior tooth and makes a brief discussion about the available options for this type of rehabilitation. The use of reinforced glass fiber as reinforcement of the structure of devitalized teeth is indicated for the prevention of dental fractures. Cast ceramic cores are indicated for the insufficient coronary remaining to support the filling material.<strong></strong></p>
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Nikolaychuk, Evgeny A., Andrei K. Iordanishvili, and Evgeny Kh Barinov. "Case of dental restoration by materials not permitted for use in medical practice." Russian Journal of Forensic Medicine 7, no. 1 (2021): 48–50. http://dx.doi.org/10.17816/fm338.
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Introduction: In recent years, endodontic dental treatment associated with periodontal inflammation in the provision of emergency and planned dental care is not provided with the appropriate standard and quality. Clinical case: Clinical observation is done to a patient suffering from exacerbation of chronic periodontitis, who underwent restoration of 2.6 teeth with light-cured filling material 15 years ago, and intraroot pins of which are made of materials that are not approved for medical practice use. Conclusion: The use of inappropriate material in medical practice for tooth restoration gives the patient the right to seek for material and moral compensation for bodily harm.
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Aborisade, A., J. Abdurrazaq, and J. Adeoye. "Concurrent presentation of dental lamina cysts of the new born and natal tooth in a child: a case report and literature review." African Journal of Oral Health 9, no. 1 (2019): 1–4. http://dx.doi.org/10.4314/ajoh.v9i1.1.
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Dental lamina cysts and natal/neonatal teeth are rare findings in a neonate with the dental lamina cysts presenting as white or pink small nodules, often multiple, approximately 1 to 3mm in diameter. They are usually located on the alveolar mucosa of both maxilla and mandible and also on the midpalatine raphe; the whitish colored lamina cysts found on the alveolar mucosa can be confused clinically with neonatal teeth. Neonatal teeth are teeth found in infants within the first 30 days of life, and they present a social stigma to the parent. They have been reported to be a component of the full complement of teeth in 90-95% of cases. Apart from the social stigmata, they can also induce trauma to surrounding soft tissues and / or to the mother’s breast (Riga-Fede phenomenon). While the dental lamina cysts usually resolve spontaneously within few weeks to months, there are indications that might preclude extraction of a natal/neonatal tooth.Keywords: Dental lamina cyst, Epstein’s pearls, Mucosal cyst, natal/neonatal tooth
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Bajić, Marijana Popović, Violeta Petrović, Vanja Opačić Galić, et al. "Direct pulp capping with novel nanostructural materials based on calcium silicate systems and hydroxyapatite." Stomatoloski glasnik Srbije 63, no. 4 (2016): 183–92. http://dx.doi.org/10.1515/sdj-2016-0019.
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Summary Introduction Direct pulp capping is an important therapeutic method that has goal to provide formation of dentin bridge and healing process of the pulp. The aim of this study was to investigate the effects of new nanostructural materials based on calcium silicate systems and hydroxyapatite on exposed dental pulp in Vietnamese pigs. Material and Methods The study was conducted on 30 teeth of two Vietnamese pigs (Sus scrofa verus). On buccal surfaces of incisors, canines and first premolars, class V cavities were prepared with a small round bur and pulp horn was exposed. In the first experimental group (10 teeth) the perforation was covered with new nanostructural material based on calcium silicate systems (CS). In the second experimental group, the perforation was covered with compound of calcium silicate systems and hydroxyapatite (HA-CS) (10 teeth). In the control group, exposed pulp was covered with Pro Root MTA® (Dentsply Tulsa Dental, Johnson City, TN, USA) (10 teeth). All cavities were restored with glass ionomer cement (GC Fuji VIII, GC Corporation, Tokyo, Japan). Observation period was 28 days. After sacrificing the animals, histological preparations were done to analyze the presence of dentin bridge, inflammatory reaction of the pulp, pulp tissue reorganization and the presence of bacteria. Results Dentin bridge was observed in all teeth (experimental and control groups). Inflammation of the pulp was mild to moderate in all groups. Neoangiogenesis and many odontoblast like cells responsible for dentin bridge formation were detected. Necrosis was not observed in any case, neither the presence of Gram-positive bacteria in the pulp. Conclusion Histological analysis indicated favorable therapeutic effects of new nanostructural materials based on calcium silicate systems and hydroxyapatite for direct pulp capping in teeth of Vietnamese pigs.
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Kuo, Tzong-Fu, Shi-Yuan Sheu, Ching-Chuan Jiang, et al. "TOOTH REGENERATION WITH DENTAL STEM CELL RESEARCH IN MINIATURE PIG MODEL." Taiwan Veterinary Journal 41, no. 03 (2015): 197–203. http://dx.doi.org/10.1142/s1682648515500109.
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To develop a cell-based approach to tooth regeneration, we isolated dental stem cells from tooth buds of mini pigs and culture-expanded them for about three weeks. Flow cytometry revealed that the majority of the proliferating cells were positive for stem cell surface markers, including CD105, CD29, CD44, CD71. These dental stem cells were then seeded in biodegradable agarose gel for autograft in various areas of the jaw bone. Mini pigs with tooth buds removed without transplantation of dental stem cells served as control. After one year, well differentiated tooth crown and root sheath were formed in mini pigs in the experimental group. The tooth formed by dental stem cells transplanted in alveolar bone was similar in size to original tooth crown (approximately 2 cm × 2 cm × 2 cm). The teeth formed by dental stem cells transplanted under the roots of the anterior teeth and in the cortical bone area were smaller. In the control group, the space where the tooth bud was extracted without cell transplantation was seen to be closed by forward movement of the posterior teeth. Histological analysis showed the structures of enamel, dentin and pulp in the regenerated tooth crown. Immunohistochemical analysis of amelogenin, type I collagen and bone sialoprotein confirmed enamel and dentin formation. Enamel and dentin structures on the regenerated tooth were also identified using scanning electron microscopy. These findings demonstrate a successful model of tooth regeneration from dental stem cells in mini pigs. In addition, local environment and available space also significantly affect the extent of tissue regeneration. Our study demonstrates the feasibility of using dental stem cells for tooth regeneration in clinical applications.
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Galo, Rodrigo, Marta Maria Martins Giamatei Contente, and Maria Cristina Borsatto. "Wear of two pit and fissure sealants in contact with primary teeth." European Journal of Dentistry 08, no. 02 (2014): 241–48. http://dx.doi.org/10.4103/1305-7456.130619.
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ABSTRACT Objectives: Wear simulations may provide an indication of the clinical performance of pit-and-fissure sealants when associated with primary teeth as counterbody, restricting the involved variables. The aim of this study was to evaluate wear of dental materials used as pit-and-fissure sealants in contact with primary teeth. Materials and Methods: A resinous sealant (Fluroshield®) and a resin-modified glass ionomer cement (Vitremer®) were selected in a post-plate design, using as counterbody primary tooth pins (4 × 4 × 2 mm) at 3 and 10 N vertical load, 1 Hz frequency, 900 wear cycles in artificial saliva (n = 15). Attrition coefficient values were obtained and the material and primary tooth volumes were analyzed. Data were analyzed statistically by ANOVA and Duncan's test (P < 0.05). Results: Fluroshield® presented the highest attrition coefficient values for the 3 N but these values decreased significantly for the 10 N load. The means for volume loss (3 mm) of the different samples after the wear test were not statistically different for the materials. The volume loss values for the primary teeth were statistically different and there was an increase in volume loss with the increase of the load applied in the wear tests. Conclusions: Differences were also observed with regard to the surface deformation characteristics. The wear rates of primary tooth enamel vary according to the type of material and the load applied during mastication.
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Franco, Ademir, Murilo Navarro de Oliveira, Lorenna Keren Gomes-Lima, et al. "Case-specific characteristics of pink teeth in dental autopsies – A systematic review." Journal of Forensic and Legal Medicine 68 (November 2019): 101869. http://dx.doi.org/10.1016/j.jflm.2019.101869.
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PAPADIMITRIOU (Σ. ΠΑΠΑΔΗΜΗΤΡΙΟΥ), S., A. THOMAS (Α. ΘΩΜΑΣ), and M. KOUKI (Μ. ΚΟΥΚΗ). "Dental problems in rabbits and rodents." Journal of the Hellenic Veterinary Medical Society 59, no. 3 (2017): 225. http://dx.doi.org/10.12681/jhvms.14960.
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As the number of pet rabbits and rodents has raised lately, veterinarians have to cope with various medical conditions that affect them and especially those concerning their teeth in everyday practice. Rabbits', guinea pigs and chinchillas whole dentition and the incisors of the rest of the rodents are known as elodont teeth. Malocclusion, which is the most common dental condition seen in those animals occurs due to a combination of several factors and inappropriate diets. The owners frequently fail to recognize their pets' dental disease in time. Consequently, when they are finally presented to the vet, their condition is difficult to be treated and their life is in danger. The examination of the oral cavity should preferably be made under general anaesthesia. Radiological assessment is also essential in order to acquire valuable information about the teeth, roots and facial bones. As mentioned before, malocclusion is the most common dental problem that rabbits and small rodents experience whereas cheekteeth malocclusion is the most frequently recognized problem in guinea pigs and chinchillas. The common factors that contribute are: genetic predisposition (prognathism or brachygnathism), trauma and metabolic disorders. The symptoms vary from difficulty in mastication, bad breath, lesions of the tongue and oral mucosa to facial swelling, abscesses, fistulisation, ocular disease etc. Usually there are also symptoms regarding the animal's general health such as lack of appetite, emaciation and alternation of the feaces' composition. Treatment is both surgical and pharmaceutical. Occlusal equilibration may be accomplished by burring. If this is not possible, the extraction of all the incisors is recommended. In case of an abscess, debridement and extraction of the responsible tooth (usually affecting cheek teeth) is advised. Moreover, antibiotics and analgesics-antinflammatory drugs are of great help. The selection of the appropriate antibiotic should be based on aerobic and anaerobic culture and sensitivity, especially in case of an abscess. The most common antibiotics prescribed are enrofloxacin, Oxytetracycline, doxycycline, amicasin and metronidazole. The most common analgesics are opioids (e.g. fentanyl, buprenorphine, butorphanol) and NSAIDs (e.g. carprofen, meloxicam). Small mamals who are suffering from dental disease have to be treated very cautiously because of their being sensitive by nature. Especially rabbits and guinea pigs are very sensitive to the protracted loss of appetite. The preanaesthetic management is also critical. The complete blood count and serum biochemical analysis, especially in dehydrated and undernourished patients is imperative to be measured, as the iv administration of normal saline or dextrose serum and electrolytes is often needed. There is a positive correlation between feeding the animals on balanced diets (especially in calcium) and avoidance of dental problems. Therefore, prevention could be managed via the combination of appropriate diets and proper advising of the owners. The diet should consist of hay, straws and small quantities of cereals. The veterinarian should inform the owners about proper management of their pet, feeding and periodical examinations that should be done in order to prevent these pathological conditions.
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Richards, A., J. Kragstrup, K. Josephsen, and O. Fejerskov. "Dental Fluorosis Developed in Post-secretory Enamel." Journal of Dental Research 65, no. 12 (1986): 1406–9. http://dx.doi.org/10.1177/00220345860650120501.
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The aim of this study was to test whether dental fluorosis can be produced by administration of chronic doses of fluoride during only the post-secretory stage of enamel mineralization. Eight control and eight experimental pigs matched by weight and litter were fed a low-fluoride diet (<0.05 mg F-/kg b.w. daily) from weaning to slaughter at 14 months. The test group received an oral dose of 2 mg F -/kg b.w. per day from 8 months of age. Lower fourth pre-molars were at the post-secretory stage at the start of fluoride administration (confirmed by tetracycline marker) and were just erupting at slaughter. All of the fourth pre-molar teeth from the test group developed diffuse enamel hypomineralization indistinguishable from human fluorosis. No such lesions were seen in any of the teeth from the control animals. It was concluded that enamel fluorosis may be caused by fluoride exposure in the maturation phase only. The pathogenic mechanism may be an effect either on the selective loss of protein or on the influx of mineral, both of which occur during the post-secretory or maturation stage of enamel formation.
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Karpishchenko, S. A., D. A. Usmanova, E. V. Bolozneva, and E. S. Karpishchenko. "CASE OF MAXILLARY SINUS FOREIGN BODY REMOVAL." Folia Otorhinolaryngologiae et Pathologiae Respiratoriae 25, no. 3 (2019): 73–77. http://dx.doi.org/10.33848/foliorl23103825-2019-25-3-73-77.
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Maxillary sinus foreign bodies are interrelated with different types of treatment of pathologies of teeth of the maxilla. Foreign bodies can be presented by pins, sillers, impression materials, teeth, dental implants etc. Features of anatomical development of maxilla, degree of pneumatization of it and many other factors promote hit of the foreign body to the maxillary sinus. Detection of the foreign body in the maxillary sinus during the operation sometimes can become a serious technical difficulty and needs a surgeon to be a man of experience. Important part of success of the surgery is selection of access to the maxillary sinus based on the 3D computed tomography data. We represent a clinical case of treatment the patient with the maxillary sinus foreign body after two non-resultative surgeries. After the implantation of dental implant, patient appealed for medical treatment, complaining on the discomfort, passing pain at the right buccal region and secrete from the right part of nose. We know from the anamnesis, that the patient was operated through the anterior maxillary wall under the general anesthesia for two times. The foreign body was removed only during the third surgery, that was done under the local anesthesia under the control of the rigid endoscopes. The patient was conversed to the out-patient treatment at the day of the surgery. The efficacy of the endoscopic endonasal approach to the maxillary sinus through the inferior nasal meatus in case of maxillary sinus foreign body was approved.
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Brunton, Paul A., Jithendra Ratnayake, Carolina Loch, Arthi Veerasamy, Peter Cathro, and Robert Lee. "Indirect Restorations and Fixed Prosthodontics: Materials and Techniques Used by General Dentists of New Zealand." International Journal of Dentistry 2019 (January 10, 2019): 1–6. http://dx.doi.org/10.1155/2019/5210162.
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Background. To investigate the selection and use of materials and techniques for core buildup, indirect restorations, and fixed prosthodontics by general dentists in New Zealand. Methods. A questionnaire comprising 19 sections and 125 questions was distributed via mail to 351 general dentists in New Zealand who were selected from the Dental Council of New Zealand’s 2016 register. Results. The majority of the respondents (68.8%) reported using resin composite light-cured materials for the core buildup of vital posterior teeth. A large number of respondents (52%) did not use dentine pins, with the majority of them (25%) being recent graduates (<10 years). Fibre posts were used by 61.6% of the dentists surveyed. The majority of dentists (54.6%) reported using addition-cured silicone impression material for crown and bridge impressions. Glass-ionomer cements (37.5% of participants) and resin-modified glass-ionomer cements (35.8%) were the most common luting cements used. Direct resin composite veneers were the preferred material of choice rather than indirect restoration of anterior teeth (40.4%). Conclusions. The study showed that New Zealand dentists surveyed are using current state-of-the-art materials and techniques, with their choice of material being greatly influenced by clinical indications and patients aesthetic demands.
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Clarke, CMH, RM Dzieciolowski, D. Batcheler, and CM Frampton. "A Comparison of Tooth Eruption and Wear and Dental Cementum Techniques in Age Determination of New Zealand Feral Pigs." Wildlife Research 19, no. 6 (1992): 769. http://dx.doi.org/10.1071/wr9920769.
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This study evaluates dental ageing techniques for feral pigs in northern South I., New Zealand. Ages of pigs were estimated by three techniques: tooth eruption and replacement on criteria calibrated from pen-reared American-bred European wild pigs; tooth eruption, development, and wear calibrated from known-age feral pigs from the study area; and annular growth in cementum of molariform teeth. All age estimations showed strong agreement with each other and with known ages. The eruption and replacement criteria were most useful for ageing pigs less than 30 months old, whereas the other two criteria were more suited to ageing pigs more than 30 months old. All permanent teeth of New Zealand feral pigs erupted 1-2 months earlier than in European and Malayan wild pigs, and permanent premolars erupted up to 4 months earlier than in Japanese wild pigs. Earlier eruption may reflect early onset of maturity in New Zealand pigs. The clarity of annuli observed varied between animals, but generally increased with age. Pigs from unforested habitat had a higher percentage of clearly defined annuli than those from forested habitat. This may be explained by a climatic or dietary factor.
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Bains, Rhythm, Aseem P. Tikku, and Promila Verma. "Occurrence of internal root resorption defects in anterior teeth with a history of concussion injury: A cross-sectional study among select adult North Indian dental patients." Asian Journal of Oral Health and Allied Sciences 10 (August 17, 2020): 7. http://dx.doi.org/10.25259/ajohas_5_2020.
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Objectives: The aim of this study was to assess the frequency of internal resorption (IR) defects in select adult North Indian population with a history of concussion injury to their anterior teeth. Material and Methods: The study population consisted of patients reporting with a history of concussion injury to their anterior teeth. At least two intraoral periapical radiographs, one at central and other at a 20° horizontal angulation, were taken for each of the affected teeth to check for any IR defect. The radiographs were inspected after placing them over a viewing box using magnifying glasses. Percentage of IR defects and their occurrence on the basis of tooth type, duration of trauma, gender, and side was assessed. Results: A total of 1507 patients reported with a history of a traumatic dental injury (TDI) to their anterior teeth. About 37.1% (560/1507) patients and 602 teeth with TDI had a history concussion injury. The percentage of patients with concussion injuries resulting in IR defect was 3.3% (19/560), and the percentage of teeth with IR defect was 3.16% (19/602). About 68.42% (13/19) were in males, and 31.58% (6/19) were in females; however, the difference was not statistically significant (χ2 = 1.05, P = 0.590). Most of the patients reported with a history of TDI within 0–5 years back, and the median age at the time of presentation was 20 years. Maxillary left central incisor was most affected, 4.84% (9/186) followed by maxillary right central incisor 3.5% (7/200) mandibular left lateral incisor 3.85% (1/26), mandibular left central incisor 3.57% (1/28), and maxillary lateral incisor 1.52% (1/66). Out of the 19 IR defects, 15 (78.9%) were located in the root, four were located coronally (21.05%), out of which 2 had a pink-colored crown. Conclusion: Silent injuries such as concussion and subsequent IR can potentially weaken the tooth; therefore, follow-up of patients with a history of TDIs is vital to rule out any developing but obscure resorptive defects.
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Popovic-Bajic, Marijana, Vesna Danilovic, Branislav Prokic, Bogomir Prokic, Vukoman Jokanovic, and Slavoljub Zivkovic. "Direct pulp capping using biodentine." Serbian Dental Journal 61, no. 2 (2014): 65–74. http://dx.doi.org/10.2298/sgs1402065p.
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Introduction. Direct pulp capping is therapeutic method of applying medication on exposed pulp in order to allow bridge formation and healing process. The aim of this study was to investigate the effect of Biodentine on exposed dental pulp of Vietnamese pigs. Material and Methods. The study was conducted on 20 teeth of Vietnamese pigs (Sus scrofa domesticus). On buccal surfaces of incisors, canines and first premolars, class V cavities were prepared and pulp was exposed. In the experimental group (six incisors, two canines and two premolars) the perforation was covered with Biodentine? (Septodont, Saint-Maur-des-Fosses, France). In the control group, the perforation was covered with MTA? (Dentsply Tulsa Dental, Johnson City, TN, USA). All cavities were restored with glass ionomer cement (GC Fuji VIII, GC Corporation, Tokyo, Japan). Observation period was 28 days. After sacrificing the animals, histological preparations were done to analyze the presence of dentin bridge, an inflammatory reaction of the pulp, pulp tissue reorganization and the presence of bacteria. Results. Dentin bridge was observed in all teeth (experimental and control groups). Inflammation of the pulp was mild to moderate in both groups. Neoangiogenesis and many odontoblast like cells responsible for dentin bridge formation were detected. Necrosis was not observed in any case, neither the presence of Gram-positive bacteria in the pulp. Conclusion. Histological analysis indicated favorable therapeutic effects of Biodentine for direct pulp capping in teeth of Vietnamese pigs. Findings were similar with Biodentine and MTA.
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Alama, Md Ashraful, Umme Salma Abdullah, Monoara Mofiz, Salma Aktar, Asaduszaman, and Mohoshina Karim. "Oral health status among the under five children attending at OPD of Dhaka Dental College Hospital." Update Dental College Journal 5, no. 2 (2016): 9–17. http://dx.doi.org/10.3329/updcj.v5i2.27263.
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Aim: The purpose of the study was to assess the oral health status among the under five children. Study revealed to find out selected dental conditions like dental caries, gingival and periodontal conditions and DMFT score and socio-demographic background.Methods: A descriptive type of cross sectional study was conducted at Dhaka Dental College Hospital at children OPD.A total 120 under five childrens parents were interviewed through a structured questionnaire followed by oral examination through a checklist.Results: Among 120 children, 44.17% were male and 55.83% were female. Most of the children (94.17%) were found to clean teeth regularly by themselves. 70.83% children clean their teeth themselves with brush and paste once daily spending 1-3 minutes. Maximum children (73.33%) clean their teeth before breakfast. Fluoridated toothpaste was being used by most of the children (85.84%). Only 4.17% child change their toothbrush every month and 55.83% every two months and 40% after 3-6 months. Regarding feeding history, it was found that 58.33% children were given exclusive breast feeding. Most of the children (63.33%) take soft drinks. It was found from the study that 87.50% children had pink color oral mucosa and their gingival condition was normal. Though prevalence of dental caries was 96.67% but overall oral hygiene status was good (86.67%).Conclusion: The study revealed that, dental caries among the under five children was a major health concern creating awareness among the people about their own and their childrens oral health through appropriate plan can reduce the dental diseases. Moreover mass media and general education of the people create vital role in this regards.Update Dent. Coll. j: 2015; 5 (2): 09-17
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Zhang, W., B. Vazquez, D. Oreadi, and P. C. Yelick. "Decellularized Tooth Bud Scaffolds for Tooth Regeneration." Journal of Dental Research 96, no. 5 (2017): 516–23. http://dx.doi.org/10.1177/0022034516689082.
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Whole tooth regeneration approaches currently are limited by our inability to bioengineer full-sized, living replacement teeth. Recently, decellularized organ scaffolds have shown promise for applications in regenerative medicine by providing a natural extracellular matrix environment that promotes cell attachment and tissue-specific differentiation leading to full-sized organ regeneration. We hypothesize that decellularized tooth buds (dTBs) created from unerupted porcine tooth buds (TBs) can be used to guide reseeded dental cell differentiation to form whole bioengineered teeth, thereby providing a potential off-the-shelf scaffold for whole tooth regeneration. Porcine TBs were harvested from discarded 6-mo-old pig jaws, and decellularized by successive sodium dodecyl sulfate/Triton-X cycles. Four types of replicate implants were used in this study: 1) acellular dTBs; 2) recellularized dTBs seeded with porcine dental epithelial cells, human dental pulp cells, and human umbilical vein endothelial cells (recell-dTBs); 3) dTBs seeded with bone morphogenetic protein (BMP)-2 (dTB-BMPs); and 4) freshly isolated nondecellularized natural TBs (nTBs). Replicate samples were implanted into the mandibles of host Yucatan mini-pigs and grown for 3 or 6 mo. Harvested mandibles with implanted TB constructs were fixed in formalin, decalcified, embedded in paraffin, sectioned, and analyzed via histological methods. Micro-computed tomography (CT) analysis was performed on harvested 6-mo samples prior to decalcification. All harvested constructs exhibited a high degree of cellularity. Significant production of organized dentin and enamel-like tissues was observed in dTB-recell and nTB implants, but not in dTB or dTB-BMP implants. Micro-CT analyses of 6-mo implants showed the formation of organized, bioengineered teeth of comparable size to natural teeth. To our knowledge, these results are the first to describe the potential use of dTBs for functional whole tooth regeneration.
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Nesterov, Alexander M., Mukatdes I. Sadykov, and Vladislav V. Matrosov. "Analysis of orthopedic treatment of patients with stump pins inserts with artificial crown in significant destruction of the clinical dental crown: the data of archival materials of the dental clinic." Aspirantskiy Vestnik Povolzhiya 20, no. 1-2 (2020): 96–101. http://dx.doi.org/10.17816/2072-2354.2020.20.1.96-101.
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The aim of the article is to analyze the orthopedic treatment of patients with a lack of clinical tooth crowns by means of stump pin inserts with an artificial crown presented in the archival materials from the dental clinic of Samara.
 Research methods. Health records of dental patients and the orthopaedic work orders of the Dental Clinic No. 2 of the city of Samara over the period of 20152019 were analyzed.
 Results. Of the total number of patients (142,394 people), 5370 patients underwent a stump pin insert to restore a missing tooth crown. A total of 5802 pin stump tabs were made for these patients. 524 patients (10.09%) had complications. Most complications were observed in the lateral group of patients with prosthetic teeth (62.18%). Discementation of crowns from stump pin inserts was the main complication (53.32%). Ceramic crown chipping from metal-ceramic crowns was observed in 6.46% of all complications.
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Boteva, Ekaterina. "Non-Invasive and Minimum Invasive Concepts in Prevention, Cariology and Endodontics – from Research and Science to Practice." Acta Medica Bulgarica 45, no. 1 (2018): 55–60. http://dx.doi.org/10.2478/amb-2018-0011.
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AbstractThe minimum invasive dental concept is based on practical experience of more than 30 years negative trends from the use of resin materials in distal teeth and early metal-ceramic “aesthetic” crowns and bridges. The scientific dental research includes all aspects of the conservative dentistry treatment which are scientifically and clinically proved with most up to date methods and tests: anthropometric, epidemiological, biochemical, immunohistochemical, electron microscopy, polarized light microscopy, light induced fluorescence, microradiography, microbiology, genetic tests, etc. Experiments in vitro, animal tests, clinical research in the last 34 years are focused in the field of prevention of dental caries, treatment of precavitated precarious lesions with nanotechnologies, preparation of hard dental tissues with most conservative techniques, adhesive restoration methods with amalgam and resins, backup in endodontics in root canals preparation methods and in pins and posts fixations. The conclusions can be focused on basic principles and refocused in the 21st century like: Dental caries is not only predictable and controlled disease but is also a polyetiological disease on a community and population levels and uni- or bi-etiological on an individual level. The minimum invasive dental concept in cariology and endodontics leads to prevention of early extractions, early prosthetic medical procedures and to lifetime dental health. This plays a key role in prevention of metabolic disorders and gastrointestinal diseases.
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Medina, Sebastián, Sandra Henao, Viviana Muñóz, et al. "Macroscopic analysis of dental and periodontal tissues of pig (Sus domesticus) exposed to high temperatures." Revista Estomatología 21, no. 1 (2017): 28–34. http://dx.doi.org/10.25100/re.v21i1.5755.
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SUMMARYObjective: To describe the physical changesofmacro-structural dental tissues (enamel,dentin and cement) and periodontal(oral mucous membrane, alveolar compactbone and cancellous alveolar bone) ofdomestic pig (Sus domesticus) expose tohigh temperatures.Materials and methods: This descriptivestudy observed the physical changes in macro-structural dental tissues and periodontalin 25 teeth of domestic pigs subjected tohigh temperatures (200°C, 400°C, 600°C,800°C and 1000°C).Results: Dental and periodontal tissues studiedshow great resistance when subjectedto high temperatures without changing significantlytheir macro-structure. At 200°Cno color changes and cracks appear in theenamel. At 400°C there was an increase ofthe fissure and no separation between thehard tissues, initiating carbonization. At600°C fractures in the dental tissues andbone are most apparent. At 800°C burningof the tissues initiated. At 1000°C there wasno evidence of soft tissue.Conclusions: Macroscopic analysis of theteeth articulated in their alveolar-dentalunits constitutes a experimental model thatssimulates the changes of dental and periodontaltissues expose to high temperature.It is recommended to conduct astudy onhuman teeth in their respective unit articulatedalveolar to determine whether themacro-structural physical changes describedare repeated and can be extrapolated,and which can eventually be used duringthe process of dental identification anddocumentation of the medical legal autopsyused in the case of bodies or human remainsburned, charred and burned.Key words: Forensic dentistry, domesticpig (Sus domesticus), dental and periodontaltissues, temperature exposition, animalmodel.
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Zhyvotovskyi, I. V., Yu I. Sylenko, and M. V. Khrebor. "COMPARATIVE CHARACTERISTICS OF THE EFFECTIVENESS OF DIRECT AND INDIRECT RESTORATIONS ON TEETH WITH DISCOLORATION." Ukrainian Dental Almanac, no. 3 (September 6, 2019): 27–33. http://dx.doi.org/10.31718/2409-0255.3.2019.05.
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The rapid development of dental industry and constant improvement of technologies in production of basic dental materials contribute to the increase of the quality of rendering dental care with the obligatory consideration not only of functional but also aesthetic parameters during a patient's rehabilitation. However, there is still no precise indication for the use of metal-free structures for the qualitative and durable aesthetic restoration of the frontal group of teeth, white-pink aesthetics and prosthetic rehabilitation, taking into account changes in the parameter of biological width of the tooth and aesthetic criteria.
 The aim of the research is to improve the effectiveness of treatment of frontal group teeth with discoloration using direct and indirect restorations by evaluating and comparing the quality of restorations.
 Research materials and methods. For clinical substantiation and comparison of direct and indirect ceramic restorations with classical fixation and the proposed method of fixation on the heated composite, 90 patients with discoloration and defects of the crown of the front teeth, aged 18 to 65 years, were examined and treated. A comparative evaluation was carried out one year after the restoration was completed.
 The distribution of patients into clinical groups was as follows: the first group – patients who were treated by direct restorations, performed with light- polymer restorative material Estet X HD (Dentsply) (50 patients, 125 restorations); the second group embraced patients, treated with indirect ceramic restorations manufactured by the method of pressing high temperature ceramics (IPS Emax). The latter group was in turn divided into two subgroups, depending on the treatment method: 2A – patients with indirect fixation by conventional methods on the Dentsply dual-cure composite of Calibra production (20 patients, 70 veneers) and 2B - patients with fixation treated on the heated composite Gradia Direct by GC production (20 patients, 55 veneers).
 In order to evaluate the quality of prosthetics in patients with direct and indirect ceramic restorations (veneers) it has been determined the status of these restorations using the modified USPHS (United States Public Health Service; Ryge, G., 1980, 1981) criteria for the frontal teeth group. The obtained results were processed by the method of variational statistics using Student's test.
 Research results. During the clinical evaluation of direct restorations using the modified USPHS criteria for the frontal teeth group, the following complications were identified: tooth sensitivity was present in 5.6% of teeth, fractures, cracks, chips – in 20 restorations (16%); discrepancy between the color of restoration and the color of natural teeth – in 30 restorations (24%); the presence of defects in the texture of the surface – 30 teeth (24%). Impaired marginal adaptation was in 32 restorations, which amounted to 25.6%; loss of restoration gloss – in 66,4%, the presence of secondary caries – in 17 teeth (13,6%); deficiency of occlusal contact –in 13 restorations (10.4%), of approximate contact – in 17 restorations (3.6%). A detailed analysis of the condition of indirect restorations and clinical complications in the second group showed that the most common defects are impairment of marginal adaptation – 16 veneers (12.8%), impairment of the integrity of veneers due to fractures, cracks, chips – 6 (4.8%), inconsistency of color – 13 veneers (10.4%), the presence of surface texture defects – 0, secondary caries – 3 teeth (2.4%), the position of fixing cement – 4 veneers (3.2%). Impaired occlusal contact was observed in 1 tooth (8.8%). No changes in approximate contacts were detected. The total number of complications was 17%, which indicates the need to find the optimization approaches to treatment with these structures.
 Comparison of the status of indirect restorations, depending on the method of fixation by subgroups showed that the impaired integrity of veneers due to fractures, cracks, chips in subgroup 2A was detected in 4 teeth (5.7%), and in the subgroup 2B – in 2 teeth (3.6%). Color change in group 2A was observed in 12 teeth (17.1%), in group 2B – in 3 teeth (5.5%). Disorders of marginal adaptation in group 2A were observed in 12 teeth (17.1%), in group 2B – in 4 teeth (6.6%). Secondary caries was observed on 2 teeth (2.9%) in group 2A and in one patient in group 2B (1.8%). According to the criteria for evaluating the state of indirect ceramic restorations and recommended follow-up professional actions, the following estimates were established: 28% of restorations in the first group, 55.7% of restorations in group 2A, 85.5% of restorations in group 2B received an “excellent” rating; 33.6% of restorations in the first group, 25.7% in group 2A, 5.5% in group 2B received a “good” rating; a “satisfactory” rating was obtained by 11.2% of restorations in the first group, 11.7% in group 2A, 5.4% in group 2B. In the first group, 27.2% of restorations needed immediate replacement, 11.4% – in the second and 3.6% – in the third group.
 The total score for the first group was 3.87±0.07, for 2A – 4.26±0.12, p.05, for group 2B – 4.73±0,1, p1˂p,05, p2˂0,05.
 Conclusion. Thus, our studies of direct and indirect restorations after one year of use showed that the highest level of quality was observed in the group where indirect restorations (veneers) were manufactured, which were fixed on the heated Gradia Direct composite by GC production. The obtained results are confirmed by the statistical analysis.
 To evaluate the quality and duration of using direct and indirect structures with different types of fixation, it is advisable to carry out a long-term monitoring for up to 10 years.
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Trippe, Leslie H., Apoena Aguiar Ribeiro, M. Andrea Azcarate-Peril, John S. Preisser, Rujin Wang, and Andrea Ferreira Zandona. "Is Fluorescence Technology a Promising Tool for Detecting Infected Dentin in Deep Carious Lesions?" Caries Research 54, no. 3 (2020): 205–17. http://dx.doi.org/10.1159/000505643.
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The purpose of this study was to determine if the degree of fluorescence detected by fluorescence-aided caries excavation (FACE) correlates with dentin bacterial microbiome diversity, as assessed by 16S rRNA gene amplicon sequencing, and with traditional tactile dentin caries assessment. Unidentified human teeth were obtained from a dental facility. The included teeth had a carious lesion two-thirds into the dentin, verified by radiography, and were red-fluorescing (RF) using FACE technology (SIROInspect; Sirona, Bensheim, Germany). Two independent examiners performed visual/tactile assessment of the lesions. RF sites were sampled with a sterile spoon excavator and dentin characteristics were evaluated. Once RF dentin was removed, a second sample of pink-fluorescing (PF) dentin was obtained. After excavation with a sterile round bur to nonfluorescing (NF) dentin, a third sample was collected with a slow-speed round bur. The samples were processed at the UNC (University of North Carolina at Chapel Hill) Microbiome Core Facility. Out of 134 extracted teeth collected, 21 fit the inclusion criteria, yielding 61 dentin samples. RF samples had the highest number of observed operational taxonomic units (n = 154), followed by PF (n = 109) and NF (n = 100). RF carious dentin was primarily “soft,” and NF dentin was assessed as “hard” 100% of the time by both examiners (rank correlation χ2: p < 0.001). However, approximately one-third of the tactile assessments of hard dentin still displayed some fluorescence, either pink or red. We concluded that the sampled fluorescing (RF and PF) and NF carious dentin layers displayed diverse bacterial taxa, and tactile assessments of soft, leathery, and hard corresponded with RF, PF, and NF.
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Moosavi, Horieh, Saied Mostafa Moazzami, Shaghayegh Loh, and Soheil Salari. "Microleakage Evaluation of Core Buildup Composite Resins with Total-Etch and Self-Etch Adhesive Systems." Journal of Contemporary Dental Practice 11, no. 2 (2010): 9–16. http://dx.doi.org/10.5005/jcdp-11-2-9.
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Abstract Aim Core buildup composite resins with prefabricated posts are commonly used to restore endodontically treated teeth. This study compared the sealing ability of Core Max II and Panavia F2.0 cement with total-etch and self-etch adhesive systems. Methods and Materials Sixty recently extracted human second premolar teeth were chosen and their crowns were cut 3 mm above the CEJ. After preparing proximal boxes (4±1 mm buccolingually and 3 mm occlusogingivally dimensions) and finishing root canal therapy, the teeth were randomly divided into four groups (n=15): groups 1 and 2, Core Max II without and with total-etch adhesive; groups 3 and 4, Clearfil photocore composite, A2 shade, and Panavia F2.0 cement without and with self-etch adhesive respectively. The Dentatus posts (# 2 Long) were used in canals approximately 8 mm depth. According to manufacturer guidelines, pins were cemented and cores were restored. After keeping the specimens for 24 hours at 37°C and 100% humidity, they were thermally cycled for 500 cycles, sealed with nail varnish except 1 mm beyond the margins of restoration, and then immersed in a 0.5% fuschin basic for 24 hours. Samples were embedded in clear epoxy resin, sectioned mesiodistally, and observed at 20× magnification. The microleakage was assessed under stereomicroscope and the results were recorded in percentage of dye penetration to the whole path from the cavosurface margin of the proximal boxes to the end of the post. Analysis of variance and the Tukey test were used to evaluate the data (p=0.05). Results Groups 1 and 4 had the highest and the lowest values of microleakage respectively. Microleakage of Panavia F2.0 cement was lower than for Core Max II and for both cements using adhesive made the microleakage smaller than without it (p<0.05). Conclusion Application of adhesive using Core Max II cement and Panavia F2.0 cement is strongly recommended to decrease microleakage. Self-etch adhesive performed better than total-etch adhesive. Clinical Significance With regards to microleakage, the self-etching primer displayed better sealing than that obtained with the totaletching, two-step dental adhesive. Citation Moosavi H, Moazzami SM, Loh S, Salari S. Microleakage Evaluation of Core Buildup Composite Resins with Total-Etch and Self- Etch Adhesive Systems. J Contemp Dent Pract [Internet]. 2010 March; 11(2):009-016. Available from: http://www.thejcdp.com/journal/view/ volume11-issue2-moosavi.
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Nithya karpagam G, Bhagya Lakshmi T, and Dinesh Prabhu. "Radiographic evaluation of permanent second molar development based on nollas stage of tooth development in 9-11-year-old male children." International Journal of Research in Pharmaceutical Sciences 11, SPL3 (2020): 469–74. http://dx.doi.org/10.26452/ijrps.v11ispl3.2968.
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The aim of this study is to radiographically evaluate the second molar development based on the NOLLAS stage of tooth development in 9-11-year-old male children. For this, a total of 400 orthopantomography (OPG) images were collected from the database record of Saveetha dental college. Of these 40 OPGs were selected based on the age group between 9 to 11 years old male children. The dental age of the 2nd molar was calculated based on the NOLLAS loss stage of tooth development. After data collection, statistical analysis was done in the SPSS software. Among the study population, 33.90% were nine years old, 33.90% was ten years old, and 32.20% were 11 years old. Considering the distribution of teeth assessed majority were lower left second molar - 37 (32.20%) and least were upper left second molar-27(16.95%). Majority of the teeth attained maximum development at stage 9 (pink)-25.42%, least maturation assessed at stage 7-6.78%. The association between nollas stage and age was statistically significant (P-value of 0.000, p < 0.05). The association between nollas stage and tooth number was statistically not significant (P value of 0.106, p > 0.05). Majority of the children in the age group of 9 years had 'crown almost completed' in second molar (Stage 5), majority of 10-year-old children had 'two-third root completed' in second molar (Stage 8) and majority of 11-year-old children had ' root completed with open apex' in second molar (Stage 9).
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Kubo, Cláudio Hideki, Ana Paula Martins Gomes, Paloma Grasso Madureira, Eduardo Galera Da Silva, Frederico Canato Martinho, and Clovis Pagani. "Effect of root perforations on the bond strength of fiberglass post using different adhesive systems and resin cement." Brazilian Dental Science 16, no. 4 (2013): 84. http://dx.doi.org/10.14295/bds.2013.v16i4.940.
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<p><strong>Objective: </strong>This study evaluated the effect of rootperforations on the bond strength of fiberglassposts cemented to the root canal with two adhesivesystems and resin cement. <strong>Material and Methods:</strong>Forty single-rooted human teeth received endodontictreatment and were prepared for the cementationof fiberglass posts (Exacto Mini, Angelus). Theteeth were divided into four experimental groups(n = 10) according to the root condition (with orwithout perforation) and the adhesive system used:G1: without perforation + Adper Single Bond 2(3M ESPE), G2: without perforation + Clearfil SEBond (Kuraray), G3: with perforation + AdperSingle Bond 2, G4: with perforation + Clearfil SEBond. The perforation was executed on the rootsurface with a diamond bur and sealed with whitemineral trioxide aggregate (MTA). The specimenswere sectioned and a push-out test was carriedout (1 mm/min speed and 50 kgf). The data werestatistically analyzed by ANOVA and Tukey Test(5%). <strong>Results: </strong>Adper Single Bond 2 promoted thegreatest values of bond strength to the roots withoutroot perforation. The presence of root perforation ledto the reduction in bond strength values regardlessof the bonding system used (p &lt; 0.05). <strong>Conclusion:</strong>The root perforations caused a direct effect on thebond strength of the fiberglass posts cemented byreducing the bond strength values to the root dentinregardless of the adhesive system used.</p><p>Keywords<br />Adhesion; Cementation; Dental adhesives; Dental cements; Fiberglass pins.</p>
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Bencharit, Sompop, Debra Schardt-Sacco, Michael B. Border, and Colin P. Barbaro. "Full Mouth Rehabilitation with Implant-Supported Prostheses for Severe Periodontitis: A Case Report." Open Dentistry Journal 4, no. 1 (2010): 165–71. http://dx.doi.org/10.2174/1874210601004010165.
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Oral rehabilitation for a patient with severe loss of alveolar bone and soft tissue resulting from severe periodontitis presents a challenge to clinicians. Replacing loosening natural teeth with fixed prostheses supported by dental implants often requires either gingival surgery or bone grafting. The outcome of the bone grafting is sometimes unpredictable and requires longer healing time and/ or multiple surgeries. The presence of periodontal inflammation and periapical lesions often delay the placement of bone grafts as well as dental implants. Here we present a clinical case of a patient undergone full mouth reconstruction with implant-supported fixed prostheses. We demonstrated that early placement of implants (three weeks after extractions) with minimal bone grafting may be an alternative to conventional bone grafting followed by implant placement. We believe that primary stability during implant placement may contribute to our success. In addition, composite resin gingival material may be indicated in cases of large fixed implant prostheses as an alternative to pink porcelain.
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Mavely, Arun V., Akanksha Mittal, Suman Basavaraju, Paras Mull Gehlot, and Vinutha Manjunath. "Interdisciplinary Management of Gummy Smile and Fluorosis – A Case Report." Journal of Evolution of Medical and Dental Sciences 10, no. 9 (2021): 645–48. http://dx.doi.org/10.14260/jemds/2021/137.
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An unpleasant smile can have a psychosocial effect leading to lack of self-esteem and a challenge in social relations. A perfect smile is a balance among 3 parameters: the white (teeth), the pink (gum) and the lips. A predictable smile correction warrants a multidisciplinary approach and good treatment planning. We planned for a minimally invasive interdisciplinary treatment approach for the restoration of a gummy smile with dental fluorosis in a young female patient. An interdisciplinary management of smile correction is crucial for successful results. Lasers for soft tissue management and minimal tooth preparation for direct composite veneer restorations being minimally invasive periodontal and restorative approaches were the key to success with exceptional patient satisfaction. Minimally invasive procedures in interdisciplinary dentistry should be embraced in the management of procedures requiring correction of both hard and soft tissues, for successful outcomes. Pre-treatment mock-up can build patients' confidence in dentistry and are useful tools for planning treatments with a predictable outcome. A beautiful smile is the fruit of a coordinated and balanced interplay between teeth, gingiva and lips. A compromise in any of these cornerstones can impair the beauty of a smile. Thorough knowledge and understanding about the various elements involved and their harmonious synchronisation makes smile makeovers a challenging task. One such challenge is the treatment of gummy smile. A gummy smile is a clinical condition that has gained tremendous focus and attention recently. Gummy smile is the excessive gingival display when a person smiles. It has been defined as a nonpathological condition causing aesthetic disharmony in which more than 3 mm of gingival tissue is exposed while smiling.1 Aetiology of a gummy smile can be multifactorial and the main factors being altered passive eruption (APE), vertical maxillary excess and upper lip hypermobility. The diagnosis must be accurate to deliver the appropriate line of treatment. Based on the complexity of the underlying aetiological factors involved, the treatment modalities also change from conservative approaches like aesthetic restorations and orthodontic tooth movements to periodontal and maxillofacial surgical procedures.2 Altered passive eruption (APE) also knows as “impaired passive eruption” is a clinical condition characterised by the coronally positioned marginal gingiva in relation to the cementoenamel junction (CEJ). Passive eruption is a physiological phase involved in the process of tooth eruption. As the teeth meet the occlusal plane, the soft tissue covering the teeth migrates apically till the CEJ is reached. Retardation in this process causes failure of the gingiva to migrate apically, resulting in short clinical crowns and excessive soft tissue exposure while smiling. This is visualised as a gummy smile.
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Popovic-Bajic, Marijana, Vesna Danilovic, Branislav Prokic, Bogomir Prokic, Milica Manojlovic, and Slavoljub Zivkovic. "Histological effects of enamel matrix derivative on exposed dental pulp." Srpski arhiv za celokupno lekarstvo 143, no. 7-8 (2015): 397–403. http://dx.doi.org/10.2298/sarh1508397p.
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Introduction. Direct pulp capping procedure is a therapeutic application of a drug on exposed tooth pulp in order to ensure the closure of the pulp chamber and to allow the healing process to take place. Objective. The aim of this study was to examine the histological effects of Emdogain? on exposed tooth pulp of a Vietnamese pig (Sus scrofa verus). Methods. The study comprised 20 teeth of a Vietnamese pig. After class V preparation on the buccal surfaces of incisors, canines and first premolars, pulp was exposed. In the experimental group, the perforations were capped with Emdogain? (Straumann, Basel, Switzerland), while in the control group pulp capping was performed with MTA? (Dentsply Tulsa Dental, Johnson City, TN, USA). All cavities were restored with glass-ionomer cement (GC Fuji VIII, GC Corporation, Tokyo, Japan). The observational period was 28 days, after which the animal was sacrificed and histological preparations were made. A light microscope was used to analyze dentin bridge formation, tissue reorganization and inflammation, and the presence of bacteria in the pulp. Results. The formation of dentin bridge was observed in the experimental and control groups. Inflammation of the pulp was mild to moderate in both groups. Angiogenesis and many odontoblast-like cells, responsible for dentin bridge formation, were observed. Necrosis was not observed in any case, nor were bacteria present in the pulp. Conclusion. Histological analysis indicated a favorable therapeutic effect of Emdogain? Gel in direct pulp capping of Vietnamese pigs. Pulp reaction was similar to that of MTA?.
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Robo, Ilma, Saimir Heta, Geriona Lasku, and Vera Ostreni. "Prevalence of Chronic Periodontitis: A Retrospective Cross-sectional Study." SciMedicine Journal 3, no. 1 (2021): 35–43. http://dx.doi.org/10.28991/scimedj-2021-0301-5.
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Introduction: The characteristic appearance of chronic periodontitis with the absence of bacterial plaque or with minimal amounts of it, but with the presence of gingival health, expressed in the specific pink color of the gingiva, is associated with active stages of the disease and its inactive stages. The aim of this study is to compare cross-sectional and retrograde data on the prevalence of chronic periodontitis in the two respective groups of patients, evaluated according to specific periodontal diagnostic tools. Materials and Methods: The study was applied in two groups of patients: the first group of patients presented at the dental clinic in the period October 2019 - January 2020 and the second group; in the period October-November in the annual interval 2010-2018. In these patients, periodontal status was assessed based on probing values, bacterial plaque index, bleeding index, and amount of gingival fluid in specific dentures. The number of natural teeth and the number of teeth replaced with fixed prosthetics were recorded. Results: For both cross-sectional and retrograde data, chronic periodontitis is a disease that affects young people, with a higher prevalence in females. This data is expressed with high ratios of tooth loss for periodontal reasons. The highest dental care for replacement with fixed prosthetics, again belongs to the female sex, but with a high bacterial plaque index. The high index of gingival hemorrhage with reduced bacterial plaque index, are data with high percentages both for the group of patients cross-sectional data and for the group of patients with retrograde data. Conclusions: The high prevalence of chronic periodontitis at a young age indicates a poor prognosis of this disease at older ages. Gingival recession associated with loss of attachment for patients with chronic periodontitis have higher values at age intervals 31-50 years, intervals where systemic pathologies are in the stages of development and stabilization in the human body. Doi: 10.28991/SciMedJ-2021-0301-5 Full Text: PDF
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Kallistová, Anna, Roman Skála, Ivan Horáček, Nobuyoshi Miyajima, and Radana Malíková. "Influence of sample preparation on the microstructure of tooth enamel apatite." Journal of Applied Crystallography 48, no. 3 (2015): 763–68. http://dx.doi.org/10.1107/s1600576715005208.
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X-ray powder diffraction and transmission electron microscopy are widely used for determination of the basic characteristics of the biological apatite structure. Many different techniques have been adopted for separation of the enamel part of the tooth for use in these analytical methods, but their influence on the sample itself has not yet been studied. In this paper, six different preparation techniques have been applied on pigs' teeth to see their effect on the microstructure of dental hydroxyapatite. Although the only inorganic component of the tooth is the hydroxyapatite, new phases, such as calcite, aragonite, calcium hydrogen phosphate and calcium carbonate hydroxide, appeared when a drilling technique or deproteination of the sample was used. In addition, the crystallite size (especially in thec-axis direction) varies within a wide range (330–700 Å) depending on the preparation technique. Thus, the results indicate a strong effect of the enamel separation on the phase composition and crystallite size. The method providing results most consistent with previous studies is manual disintegration.
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Shenoy B, Santhosh, Anahita Punj, Amitha Ramesh, and Avaneendra Talwar. "Salvaging the Lost Pink Triangle: A Case Series of Papilla Reconstruction." Case Reports in Dentistry 2020 (January 16, 2020): 1–7. http://dx.doi.org/10.1155/2020/9735074.
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Introduction. The interdental papilla may be lost or reduced in height, forming black triangles due to various reasons, which gives an unaesthetic appearance when the patient smiles. Various noninvasive and invasive techniques have been used to augment/reconstruct the interdental papilla, to reclaim the pink triangle. The most satisfactory and natural appearance can be obtained by augmenting or reconstructing the lost papilla as the pink esthetics is as important as the white esthetics. Cases. Two female patients and 1 male patient reported to the dental department with the complaint of a small black gap in the gum area between their upper front teeth since 6 months and 1 year, respectively. On examination, the interdental papillae in all three cases were classified as class 1 (Nordland and Tarnow’s). The interdental papilla was augmented surgically by using three different approaches in each case. Result and Conclusion. Postoperatively and after 1-month follow-up, there was a complete fill of the interdental area by the interdental papilla normal (Nordland and Tarnow’s). As a result, the black triangle was successfully converted into a natural pink triangle in all three cases.
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Paramarta, Galih, and Eny Inayati. "MANUFACTURING TECHNIQUE OF METAL CERAMIC RESTORATION WITH IMPLANT-ABUTMENT AT GINGIVAL RESORPTION CASE." Journal of Vocational Health Studies 3, no. 1 (2019): 22. http://dx.doi.org/10.20473/jvhs.v3.i1.2019.22-31.
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Background: The low levels of patient satisfaction and confidence in the restoration of the gingival resorption results in impaired quality of life in both functional and psychosocial aspects. It is necessary to manufacture a dental restoration to restore the mastication, phonetic, and aesthetic functions associated with soft tissue repair. Manufacture of gingiva ceramic restorations which are believed to be an alternative to restore the aesthetic function and harmonization of the patient’s teeth. In terms of manufacturing techniques, this restoration has a level of difficulty in achieving a balance between “White aesthetic” and “aesthetic pink”. Objective: This study aims to provide knowledge to the reader of Manufacturing Technique of Metal Ceramic Restoration with Implant-Abutment at Gingival Resorption Case. Reviews: Gingiva ceramic restorations can be used to create esthetic implant-supported restorations when bone and gingival tissues are deficient and surgical replacement of such tissues is not possible. Dental technicians should be able to analyze the three-dimensional shapes of gingival anatomy, color, texture, smile components, the balance of the “pink aesthetic” and “white aesthetic”. Conclusion: Manufacturing Technique of Metal Ceramic Restoration with Implant-Abutment at Gingival Resorption Case including the manufacture of metal coping, oxidation, application of opaque coating, application of the first “white aesthetic” ceramics (Opaque Dentine, Dentine, Enamel and transpa on crown coping restorations), Application of opaque gingiva layer, gingival ceramics build-up "pink aesthetics”, first firing, followed by correction build-up, and second firing, and ends with the glazing process.
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Winkler, Daniela E., Thomas Tütken, Ellen Schulz-Kornas, et al. "Shape, size, and quantity of ingested external abrasives influence dental microwear texture formation in guinea pigs." Proceedings of the National Academy of Sciences 117, no. 36 (2020): 22264–73. http://dx.doi.org/10.1073/pnas.2008149117.
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Food processing wears down teeth, thus affecting tooth functionality and evolutionary success. Other than intrinsic silica phytoliths, extrinsic mineral dust/grit adhering to plants causes tooth wear in mammalian herbivores. Dental microwear texture analysis (DMTA) is widely applied to infer diet from microscopic dental wear traces. The relationship between external abrasives and dental microwear texture (DMT) formation remains elusive. Feeding experiments with sheep have shown negligible effects of dust-laden grass and browse, suggesting that intrinsic properties of plants are more important. Here, we explore the effect of clay- to sand-sized mineral abrasives (quartz, volcanic ash, loess, kaolin) on DMT in a controlled feeding experiment with guinea pigs. By adding 1, 4, 5, or 8% mineral abrasives to a pelleted base diet, we test for the effect of particle size, shape, and amount on DMT. Wear by fine-grained quartz (>5/<50 µm), loess, and kaolin is not significantly different from the abrasive-free control diet. Fine silt-sized quartz (∼5 µm) results in higher surface anisotropy and lower roughness (polishing effect). Coarse-grained volcanic ash leads to significantly higher complexity, while fine sands (130 to 166 µm) result in significantly higher roughness. Complexity and roughness values exceed those from feeding experiments with guinea pigs who received plants with different phytolith content. Our results highlight that large (>95-µm) external silicate abrasives lead to distinct microscopic wear with higher roughness and complexity than caused by mineral abrasive-free herbivorous diets. Hence, high loads of mineral dust and grit in natural diets might be identified by DMTA, also in the fossil record.
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Vlahovic, Zoran, Branko Mihailovic, Zoran Lazic, and Mileta Golubovic. "Comparative radiographic and resonance frequency analyses of the peri-implant tissue after dental implants placement using flap and flapless techniques: An experimental study on domestic pigs." Vojnosanitetski pregled 70, no. 6 (2013): 586–94. http://dx.doi.org/10.2298/vsp1306586v.
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Background/Aim. Flapless implant surgery has become very important issue during recent years, mostly thanks to computerization of dentistry and software planning of dental implants placements. The aim of this study was to compare flap and flapless surgical techniques for implant placement through radiographic and radiofrequency analyses. Methods. The experiment was made in five domestic pigs. Nine weeks following domestic pigs teeth extraction, implants were placed, on the right side using surgical technique flap, and flapless on the left side. Digital dental Xrays were applied to determine primary dental implant stability quality (ISQ). At certain intervals, not later than three months, the experimental animals were sacrificed, and just before it, control X-rays were applied to measure dental implants stability. Results. Radiographic analysis showed that peri-implant bone resorption in the first 4 weeks following placement implants with flap and flapless surgical techniques was negligible. After the 3 months, mean value of peri-implant bone resorption of the implants placed using flap technique was 1.86 mm, and of those placed using flapless technique was 1.13 mm. In relation to the primary dental implant stability in the first and second week there was an expected decrease in ISQ values, but it was less expressed in the dental implants placed using the flapless technique. In the third week the ISQ values were increased in the dental implants placed by using both techniques, but the increase in flapless implant placement was higher (7.4 ISQ) than in flap implant placement (1.5 ISQ). The upward trend continued in a 4- week period, and after 3 months the dental implant stability values in the implants placed using flap technique were higher than the primary stability for 7.1 ISQ, and in the implants placed using flapless technique were higher comparing to the primary stability for 10.1 ISQ units. Conclusion. Based on the results of radiographic and resonance frequency analyses it can be concluded that the flapless technique in surgical implants placemat, leads to better results.
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Munoz-Sanchez, Marie-Laure, Nicolas Decerle, Laurent Devoize, Emmanuel Nicolas, Pierre-Yves Cousson, and Jean-Luc Veyrune. "Dental Trauma Management in a Young Teenager through Endodontics and Implantology: A Case Report." Healthcare 9, no. 5 (2021): 542. http://dx.doi.org/10.3390/healthcare9050542.
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Endodontic treatment is often the first-line procedure to manage the immediate or long-term aftermath of dental trauma, particularly in cases of luxation or avulsion. Failure to manage trauma in the short or medium term leads to significant functional or aesthetic consequences, especially in the adolescence period. Under this specific conditions, endodontic treatment could provide a temporary solution by keeping teeth with poor prognosis on the arch while waiting for better anatomical conditions for implantology. This clinical case aimed to describe the management of a maxilla-facial dental trauma and the following consequences in a 10-year-old male patient. Clinical and radiological examination showed complete extrusive luxation of 11 and 21 and intrusive luxation of 12 and 22. Endodontic treatment of 11 and 21 was performed six months after the trauma. Two years later, the patient was referred to the endodontic department because pink spot lesions appeared on 12 and 22 due to cervical invasive resorptions (class III for 12 and class II for 22). Endodontic treatment of 12 and filling with resin composite of 22 were performed. During the following two years, complication management finally led to placement of four OBI® (Euroteknika, Sallanches, France)-type mini-implants after avulsion of all four maxillary incisors. Palliative endodontic treatment helped maintain the prosthetic space and the volume of supporting tissue needed for future implant placement. The interest of using delaying procedures (palliative endodontic treatments and mini-implants) was to allow the patient to complete growth. Managing early treatment failure of trauma in adolescents has to be pluridisciplinary and should take into account the evaluation of the treatment’s difficulty, the prognosis of the endodontic treatment, the available bone volume and the pubertal growth stage.
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Gallego, Miguel. "Case Report of a Satin Guinea Pig with Fibrous Osteodystrophy That Resembles Human Pseudohypoparathyroidism." Case Reports in Veterinary Medicine 2017 (2017): 1–6. http://dx.doi.org/10.1155/2017/1321656.
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A case report of a 2-year-old female satin guinea pig with a history of dental overgrowth and lameness and radiological lesions of fibrous osteodystrophy is presented. The most relevant clinical findings were bone demineralization, high level of parathyroid hormone (PTH), normophosphatemia, normal ionized calcium, and low total thyroxine (tT4) with a normal renal function. Long-term treatment was based on teeth coronal reduction and maintaining a balanced diet. PTH measurement was performed with a kit suitable for rats to test 4 different paired samples of guinea pigs and resulted in similar results for each pair of measurements. Two kits routinely employed in dogs and cats failed in measuring PTH in guinea pig serum samples. The ionized calcium, PTH, and tT4 values, not previously reported in similar cases, were obtained. The determination of tT4 could be useful in the diagnosis of fibrous osteodystrophy in guinea pigs. The observed findings show similarity with human pseudohypoparathyroidism type Ia, a disease caused by an inactivating heterozygous mutation of the stimulatory G proteinαsubunit from the maternal genome that induces multiple hormone resistance and that courses with a syndrome called Albright hereditary osteodystrophy. Naturally occurring pseudohypoparathyroidism in animals has been reported previously only in a ferret.
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Haba, Danisia, Yllka Decolli, Emilia Marciuc, and Ana Elena Sîrghe. "Teeth Impaction and Structural Teeth Anomalies." Seminars in Musculoskeletal Radiology 24, no. 05 (2020): 523–34. http://dx.doi.org/10.1055/s-0040-1709210.
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AbstractDentists and oral and maxillofacial radiologists have used periapical, occlusal, panoramic, and cephalometric radiographs for many years for diagnosing dental anomalies, especially before orthodontic or surgical treatment. Cone beam computed tomography was developed in recent years especially for the dental and maxillofacial region. Thus it has become the imaging modality of choice for many clinical situations, such as the assessment of dental impaction and structural teeth anomalies or other associated diseases and disorders (e.g., Gardner's syndrome, cleidocranial dysplasia). This article reviews different aspects of dental impaction and its possible effects on adjacent structures such as external root resorption, marginal bone loss, as well as describing structural dental anomalies. It provides a systematic analysis of their characteristic features and imaging findings for general radiologists to achieve a precise diagnosis and an optimal interpretation.
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Earar, Kamel, Ioan Sirbu, Ctristian Onisor, and Elena Luca. "Oral Rehabilitation on Implants and Introduction of Pathogenic Mechanisms in Relation to Oral Implants - Sugar Diabetes." Revista de Chimie 70, no. 10 (2019): 3750–52. http://dx.doi.org/10.37358/rc.19.10.7639.
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Dental implants are made of medical titanium and perfectly fit into human bone tissue; the dental implant can last a lifetime. Not beeing living organic structures, there are no nerve endings, neither at the implant level nor at the artificial crown level. The use of quality implants by an experienced implantologist, assisted by advanced technology, transforms the treatment with dental implants into the medical-surgical act with the highest success rate among dental and even medical treatments.Through the complete replacement of the tooth, including the root, can artificially reproduce the function of the natural tooth, with a strong and stable base. The implant crown, made of aesthetic materials (porcelain, zirconium) and anchored to it by means of the prosthetic abutment, will be surrounded by a healthy and aesthetic gum. Especially if the prosthetic abutment (the connecting element between the implant itself and the artificial crown) will be made of zirconium - natural light will cross ceramic layers, similar to enamel and dentine, offering a white of envy and glitter to the smile. Around the porcelain crowns (whole ceramics or zirconia ceramics) the gingiva will conform healthily, without the slightest sign of inflammation. These elements, the white of the teeth and the pink of the gums define the concept of dental aesthetics. The main problems that diabetic patients may encounter, are gingival inflammation and periodontal disease, dental mobility and tooth loss. When a dental implant is influenced by the type of diabetes, its failure rate is higher in patients with type 1 diabetes than in patients with type 2 diabetes. The study included a number of 56 patients, who presented themselves for performing an implant. Of these, 7 patients did not perform an implant. Diabetes mellitus defines a chronic metabolic disorder, which may have multiple etiopathogenesis, characterized by changes in carbohydrate, lipid and protein metabolism. Stability of the implant in the bone, immediately after implantation is crucial for the success of the treatment; this immediate stability is called primary stability and is purely mechanical in nature.
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Shchipskiy, A. V., R. R. Shakirova, and U. V. Lekomtseva. "Preventively significant information on big city residents’ dental status discovered during epidemiological study according to the questionnaire survey." Parodontologiya 25, no. 2 (2020): 116–20. http://dx.doi.org/10.33925/1683-3759-2020-25-2-116-120.
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Relevance. Effective preventive programs cannot be developed without studying the issue using population epidemiological survey.Purpose. Improving efficiency of dental diseases preventionbasing on the information obtained during an epidemiological survey of Izhevsk citizens.Materials and methods. 107 residents were examined according to WHO criteria in representative age categories: n = 57 (63.3%) in the category from 35 to 44 years old; n = 50 (46.7%) - from 65 to 88 years; n = 83 (77.6%) women (54.9 ± 1.9 years); n = 24 (22.4%) men (53.7 ± 3.7 years). The study was random and voluntary, the conclusions are based on the results of statistical analysis.Results. The respondents’ menu included products with a cariogenic effect: fruits (4.27 ± 0.09 on a 6-point scale), cookies (3.66 ± 0.11), jam or honey (3.56 ± 0.13), pies (3.48 ± 0.12), coffee (3.33 ± 0.13), tea (3.25 ± 0.13), chewing gums (3.21 ± 0.13 points), sweets (3.05 ± 0.12), beverages (3.02 ± 0.14). Respondents brushed their teeth 2 times (67.3%) or 1 time daily (30.8%), some of them used flosses (14.0%). Prevalence (p < 0.001) of positiveteeth(61.7%) and gums (72.8%) conditionappraisalmust be conceived as subjective perception. Considering “satisfactory” and “unsatisfactory” as similar critical manifestation negative assessment of the respondents reliably prevails (p <0.001). Respondents visited dentist when they felt pain (91.6%). Most of them (93.5%) advised of a partial lack of teethand the need for prosthetics.Conclusion. Cariogenic diet, lack of interdental hygiene and a check-upculture define Izhevsk citizensas potentialdentist patients. Forming preventive programs we have to explain the importance of interdental hygiene; dental care should be refocused from the category of forced demand to the category of preventive conscious demand in the mind of citizens. Due to the high educational levelwe can hope for the effectiveness of prevention programs among Izhevsk citizens.
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Ritter, Andre V. "Dental Trauma (Avulsed Teeth)." Journal of Esthetic and Restorative Dentistry 16, no. 4 (2004): 267–68. http://dx.doi.org/10.1111/j.1708-8240.2004.tb00049.x.
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Mammadova, Aytan Siraj, MaKenzie Hodge, Kehinde Matilda Folawewo, et al. "Bones Versus Teeth." Journal of the Endocrine Society 5, Supplement_1 (2021): A185—A186. http://dx.doi.org/10.1210/jendso/bvab048.375.
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Abstract Introduction: A 200% increase in population growth among those over 85 is projected in the United States by 2050. Approximately half of women over 50 will experience an osteoporotic fracture in their lifetime. Osteoporosis disproportionately affects old-old adults (those between 85 and 95) as more than half of those admitted to the hospital for hip fracture are over 80 years of age. Older adults are also likely to need dental care. The American Dental Association guidelines offer preventive recommendations for those over 60 years of age but do not address the nuances of treatment options for nonagenarian persons. This case illustrates the treatment dilemma of nonagenarians wishing to optimize both bone and dental health. Case: We have a 95-year-old performance artist, who seeks to optimize bone health in the face of recommended dental work. She has been physically active her whole life and consumes adequate quantities of calcium and Vitamin D. She doesn’t smoke but has needed periodic glucocorticoids for exacerbations of chronic lung disease. At age 84 she began ibandronate but stopped due to worsening of esophageal reflux. She was then treated with teriparatide for 2 years. DEXA scans have shown declining hip T scores from -2.8 at age 88 to -3.5 at age 94 (osteoporotic bone density: T-score lower than -2.5). Her dentist recommended the extraction of several teeth before beginning zoledronate. She refused tooth extraction and sought treatment options to enhance her bone density. Discussion: Persons of advanced age are likely to have oral health problems requiring dental treatment. Bone health treatments such as bisphosphonates and denosumab are generally safe but can potentially cause osteonecrosis of the jaw even with simple tooth extraction in old-old population. Specific guidelines are lacking for treatment to maintain bone and dental health. The American Association of Oral and Maxillofacial Surgeons suggests that extractions and implants can be conducted as usual in patients who have been treated with oral bisphosphonates for less than four years and lack other clinical risk factors. A delay of two months is suggested for those who have been treated for more than four years or has taken glucocorticoids concomitantly. The approach is uncertain for old-old adults who are taking treatment but develop a need for dental surgery. More research is needed about options for optimizing dental health while enhancing bone density in aging population.
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Sperber, G. H. "Dental history: Teeth as reliquaries." British Dental Journal 223, no. 9 (2017): 620. http://dx.doi.org/10.1038/sj.bdj.2017.934.
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Schramm-Scherer, B., P. Tetsch, St Tripler, and U. Brüderle. "Stabilizing single-rooted teeth by means of transfixation pins." International Journal of Oral and Maxillofacial Surgery 17, no. 2 (1988): 149. http://dx.doi.org/10.1016/s0901-5027(88)80212-1.
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Martin, Louise F., Daniela Winkler, Thomas Tütken, et al. "The way wear goes: phytolith-based wear on the dentine–enamel system in guinea pigs ( Cavia porcellus )." Proceedings of the Royal Society B: Biological Sciences 286, no. 1912 (2019): 20191921. http://dx.doi.org/10.1098/rspb.2019.1921.
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The effect of phytoliths on tooth wear and function has been contested in studies of animal–plant interactions. For herbivores whose occlusal chewing surface consists of enamel ridges and dentine tissue, the phytoliths might particularly erode the softer dentine, exposing the enamel ridges to different occlusal forces and thus contributing to enamel wear. To test this hypothesis, we fed guinea pigs ( Cavia porcellus ; n = 36 in six groups) for three weeks exclusively on dry or fresh forage of low (lucerne), moderate (fresh timothy grass) or very high (bamboo leaves) silica content representing corresponding levels of phytoliths. We quantified the effect of these treatments with measurements from micro-computed tomography scans. Tooth height indicated extreme wear due to the bamboo diet that apparently brought maxillary incisors and molars close to the minimum required for functionality. There were negative relationships between a cheek tooth's height and the depth of its dentine basin, corroborating the hypothesis that dentine erosion plays an important role in herbivore tooth wear. In spite of lower body mass, bamboo-fed animals paradoxically had longer cheek tooth rows and larger occlusal surfaces. Because ever-growing teeth can only change in shape from the base upwards, this is a strong indication that failure to compensate for wear by dental height-growth additionally triggered general expansive growth of the tooth bases. The results suggest that enamel wear may intensify after enamel has been exposed due to a faster wear of the surrounding dentine tissue (and not the other way around), and illustrate a surprising plasticity in the reactivity of this rodent's system that adjusts tooth growth to wear.
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Shepherd, Jonathan. "The College has teeth!" Bulletin of the Royal College of Surgeons of England 91, no. 1 (2009): 23. http://dx.doi.org/10.1308/147363509x392819.
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As part of the modernisation of dental research arrangements that it is leading in the College, the Faculty of Dental Surgery (FDS) has funded the cataloguing and display of its world-famous odontological collection. This comprises a unique range of dental and related specimens from all corners of the globe, some of them very impressive indeed, which will enhance the attractiveness and impact of the renowned College museum. A further proposal is to recruit a case PhD student to carry out original research on the primate specimens, known as the Hill collection.
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Petrescu, Horia Alexandru, Daniel Vlasceanu, Andrei Stamate, Robert Bololoi, and Stela Carmen Hanganu. "Finite Element Analyses Comparison Between Normal Teeth and Prosthetic Teeth." Key Engineering Materials 638 (March 2015): 155–60. http://dx.doi.org/10.4028/www.scientific.net/kem.638.155.
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Dental medicine represents a very important part of our life. As our appearance or looks is a major concern for us, a beautiful smile can improve our life. Moreover, our teeth health reflects on our overall health. This paper presents a method for highlighting the differences between a natural tooth and a prosthetic one. In order to determine the stress distribution in teeth during the use of prosthetics pivots, several virtual geometric models of the teeth were created (canine, first premolar, first molar and second molar), both in their natural form and when using pivots. The results obtained from these analyses were compared in order to reveal the behavior of a prosthetic tooth during normal life loads. Such results of real life behavior can be used by dental medics in order to predict the life span of restored teeth.
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Hinz, Sebastian, Ramona Schweyen, Jeremias Hey, Juergen Setz, and Christin Arnold. "Clinical performance of non-precious metal double crowns with friction pins in severely reduced dentitions." Clinical Oral Investigations 24, no. 10 (2020): 3567–75. http://dx.doi.org/10.1007/s00784-020-03228-1.
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Abstract Objectives Several in vitro studies have investigated the retention of double crowns with friction pins (DCP); however, clinical data on their long-term success have not been reported. We sought to evaluate the 5-year survival rate of DCPs in patients with severely reduced dentition (SRD) and not severely reduced dentition (NSRD). Materials and methods A total of 158 patients were treated with 182 dentures on 520 abutment teeth between 2006 and 2016. The SRD group included 144 dentures that had been inserted on 314 abutment teeth. We evaluated the influence of age, sex, jaw, number, tooth vitality, and abutment teeth localization (according to Steffel’s classification) on the 60-month survival rates of dentures and abutment teeth using the Kaplan-Meier estimator, logrank test, and Cox regression. Results The cumulative 60-month survival rate was 84.3% (CI 77.1–91.5%) for all dentures; however, the survival rate in the SRD group (80.3%; CI 71.5–89.1%) was significantly lower than in the NSRD group (100%; p = 0.04). Dentures classified in Steffel’s class A had the lowest survival rate (51.5%; CI 30.9–72.1%). Number, location, and vitality of the abutment teeth had a significant impact on survival rate. Conclusions DCP dentures showed comparable clinical long-term success to double crown systems that have been previously reported in the literature. The number, localization, and vitality of abutment teeth had the greatest influence on the survival rates of denture and abutment teeth. Clinical relevance DCP dentures have an acceptable 5-year survival rate. Clinical treatment planning must take into account key factors associated with the prognosis of the abutment teeth.
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Loy, Fionnuala, and Victoria Elton. "Shark teeth: a case of multiple supernumerary teeth." Orthodontic Update 14, no. 3 (2021): 135–37. http://dx.doi.org/10.12968/ortu.2021.14.3.135.
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A 44-year-old male was referred to the Department of Orthodontics at Manchester Dental Hospital. He presented with pain from his heavily restored, lower right second premolar, which had an apical supplemental tooth, visible radiographically. The dentist queried whether the second premolar tooth could be extracted and the supplemental tooth aligned in its place. Clinical examination revealed no relevant abnormalities. The family and medical history were non-contributory. Panoramic tomography revealed multiple supplemental supernumerary teeth in the canine and premolar regions. Cone beam computed tomography and multidisciplinary team input were required to plan the treatment for this unusual case. CPD/Clinical Relevance: These findings highlight the management and treatment options for a case of non-syndromic, multiple supernumerary teeth. Consideration must be given to the risk of damage to adjacent structures if surgically removing supernumerary teeth, and the risk that supernumerary teeth may be ankylosed and not amenable to alignment within the arch.