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Journal articles on the topic 'Tooth Extraction, instrumentation'
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1
Hamza, Hosamuddin. "Computer-Assisted Technique for Surgical Tooth Extraction." International Journal of Dentistry 2016 (2016): 1–4. http://dx.doi.org/10.1155/2016/7484159.
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Introduction. Surgical tooth extraction is a common procedure in dentistry. However, numerous extraction cases show a high level of difficulty in practice. This difficulty is usually related to inadequate visualization, improper instrumentation, or other factors related to the targeted tooth (e.g., ankyloses or presence of bony undercut).Methods. In this work, the author presents a new technique for surgical tooth extraction based on 3D imaging, computer planning, and a new concept of computer-assisted manufacturing.Results. The outcome of this work is a surgical guide made by 3D printing of plastics and CNC of metals (hybrid outcome). In addition, the conventional surgical cutting tools (surgical burs) are modified with a number of stoppers adjusted to avoid any excessive drilling that could harm bone or other vital structures.Conclusion. The present outcome could provide a minimally invasive technique to overcome the routine complications facing dental surgeons in surgical extraction procedures.
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Krizan, K. E., D. Lew, R. Burton, J. Laffoon, and J. C. Keller. "Tissue Response To Three Mixtures Of A Bone Substitute Material In Tooth Extraction Sites." Microscopy and Microanalysis 5, S2 (1999): 1292–93. http://dx.doi.org/10.1017/s1431927600019784.
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The objective of this study was to evaluate the biological responses of three different mixtures of a bone substitute material placed in tooth extraction sites to determine which mixture best enhances bone formation. Under general anesthesia three adult mongrel canine had bilateral extractions of the second and fourth premolar bicuspids. Each site was modeled into 3-wall defect with box-like dimensions and having the window on the buccal (outer) side of the mandible. A synthetic hydroxyapatite bone cement (HAC) was prepared three different ways: 1) 2.5 gms HAC + 0.75 cc sterile water (W); 2) 2.5 gms HAC + 0.75 cc 2% Hydroxypropylmethylcellulose in sterile water (HPMC); 3) 2.5 gms HAC + 0.75 cc Sodium Phosphate [45mM/15mL Phosphate + 60 MEq/15mL Sodium] (SP). Each mixture was syringe injected into a different extraction site and the fourth site received no cement to serve as a control site, and after sites were filled, a periodontal flap closure was accomplished with a 4-0 VICRYL suture.
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Khalid, Momina, Sehrish Zaffar, Muhammad Mutahir Mehdi, Mobin ,. Riaz, Fatima Ikram, and Maryam Saqib. "Effect of Honey on levels of BMP-2 in post-extraction tooth sockets in Humans." Pakistan Journal of Medical and Health Sciences 16, no. 11 (2022): 74–76. http://dx.doi.org/10.53350/pjmhs2022161174.
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Background: In Pakistan, many people undergo tooth extractions every year due to various causes such as dental caries, periodontitis, and trauma. For a healthy alveolar bone after tooth extraction, some kind of intervention is always required. Honey can possibly help to improve bone healing after tooth extractions. Aim: To observe the effects of honey on bone healing of alveolar sockets after tooth extraction in humans. Method: It was an experimental study, conducted at Lahore general hospital over the period of 6 months. Twenty-four participants were included in the study through simple random sampling technique. After tooth extractions in both groups, honey was injected into extracted sockets of the experimental group while the control group was left as it was. Levels of BMP-2 were tested in saliva through the ELISA technique on days 1, 3, and 7 of tooth extraction. Results: In the control group, mean BMP-2 levels were 485.5± 52.63, 623.7 ±47.16 and 692.5± 11.86 while in the experimental group the mean values of BMP-2 were 494.3 ± 49.89, 703.6 ± 39.31 and 812.9 ± 34.40 at day 1, 3 and 7 respectively. The mean difference was calculated to be 8.75, 79.9, and 120.5. A significant difference (p-value <0.001) was noted in levels of BMP-2 between the experimental and control group on days 3 and 7. Conclusion: Raise in levels of BMP-2 in the experimental group when compared with the control group confirmed better bone healing. Hence, honey can be used to promote bone healing in post-extraction tooth sockets. This study can be used in future to improve bone quality and minimize ridge resorption after tooth extractions. Keywords: Bone morphogenetic protein-2 (BMP-2), Honey, Extracted Tooth sockets, bone healing, ELISA.
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Krizan, K. E., D. Lew, T. Rubey, and J. C. Keller. "Tissue Response to Bone Substitute Materials Supporting Dental Implants." Microscopy and Microanalysis 4, S2 (1998): 1092–93. http://dx.doi.org/10.1017/s1431927600025587.
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The purpose of this study was to evaluate the biological response of a bone substitute material placed around Ti dental implants surgically positioned in tooth extraction sites of canine mandible. Under general anesthesia six adult mongrel canine had bilateral extractions of the fourth premolarbicuspid. Each extraction site was modeled into a 4 wall defect with box-like dimensions (1.0 mm vertically x 1.2 mm horizontally x 0.75 mm laterally). Utilizing the Branemark technique, screwtype implants with healing screws (10 mm x 4 mm), were placed in the prepared sites. A synthetic hydroxyapatite bone cement (HAC) [BoneSource®, Howmedica Laboratories, Inc.] was prepared and filled in around each implant. As controls, three canine had HAC placed in prepared sites without implants. Prior to periodontal flap suture closure a n-butyl-2-cyanoacrylate biodegradable tissue adhesive [Histoacryl®], was placed over implants and HAC. One canine each was euthanized at one month (m), two m, and three m postop.
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Silva, Jadson Mathyas Domingos da, Gleidson de Oliveira Silva, Francisco de Assis Crescencio Vergetti, et al. "Parendodontic Surgery as a Treatment Option: Case Report with One Year Follow-Up." ARCHIVES OF HEALTH INVESTIGATION 11, no. 5 (2022): 822–26. http://dx.doi.org/10.21270/archi.v11i5.6010.
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Endodontic treatment aims at eliminating microorganisms from root canal systems. The resistance of these microorganisms contributes for the permanence of the apical lesion, leading to the failure of treatment. The microbiological factor is pointed out as the major cause of failures after intervention. In these cases, root canal retreatment can be performed aims the re-instrumentation, cleaning, and new filling in the root canal. Also, retreatment treatment can be associated with a parendodontic surgery in the attempt to reverse failure without a tooth extraction. The objective of this clinical case is to report a root canal retreatment associated with apical surgery with one year follow-up in the lower central incisor’s region. It was concluded that paraendodontic surgery is an effective and conservative treatment option compared to tooth extractions, and when properly performed, with the aid of good materials such a MTA, brings satisfactory results by returning normal conditions to the periodontal tissue, as well as health and function to the teeth affected by the inflammatory process.
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Sengar, Poonam, Deborah Sybil, Imran Khan, and Sanjay Singh. "Management of iatrogenic displacement of maxillary third molar into pterygomandibular space: case report." International Journal of Scientific Reports 6, no. 10 (2020): 410. http://dx.doi.org/10.18203/issn.2454-2156.intjscirep20203959.
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<p>Third molar surgery is the most common minor oral surgical procedure performed in dental clinics. Displacement of maxillary third molar tooth into adjacent spaces such as infratemporal fossa, maxillary sinus has been reported earlier. We present an unusual case of iatrogenic displacement of maxillary third molar into pterygomandibular space. A 24 year old dental undergraduate reported to Department of Oral surgery with complaints of trismus and swelling in the check region after unsuccessful attempt at extraction of maxillary right third molar tooth. Computed tomography scan localized the tooth in the pterygomandibular space. A surgical removal of the displaced tooth was performed under general anesthesia. Displaced tooth was approached by an intraoral vertical incision along the anterior border of ramus of mandible. Correlating with computed tomography scan, tooth was located and removed followed by suturing of the surgical site. A good knowledge of the operating area and adjoining spaces is essential to avoid iatrogenic damage to tissues during minor oral surgery procedures. Adequate exposure and appropriate instrumentation during surgery can prevent undue complications and ensure quality patient care.</p>
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Selahi, Daniel, Maciej Spiegel, Jakub Hadzik, et al. "The Appliance of A-PRF and CGF in the Treatment of Impacted Mandibular Third Molar Extraction Sockets—Narrative Review." Applied Sciences 13, no. 1 (2022): 165. http://dx.doi.org/10.3390/app13010165.
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Tooth extractions, especially of impacted lower third molars, are among the most common procedures performed in dental practices. The continuity of the patient’s oral mucosa, which is interrupted during them, can manifest itself in general discomfort, pain, swelling, and even trismus. In the age of cosmetic dentistry, when lost teeth are restored through implant, prosthetic, and orthodontic treatment, each tooth extraction actually reduces the amount of available alveolar bone. This has prompted researchers to develop extraction sockets treatment procedures that reduce the negative consequences of surgical intervention while also enhancing the rate of alveolar bone and soft tissue regeneration using minimally invasive approaches. This is expected to enable or significantly facilitate further stages of treatment. The aim of this paper is to review the literature on the use of autologous blood preparations, which are considered to aid regenerative processes when applied to extraction sockets.
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Bleyan, Samvel, João Gaspar, Salah Huwais, et al. "Molar Septum Expansion with Osseodensification for Immediate Implant Placement, Retrospective Multicenter Study with Up-to-5-Year Follow-Up, Introducing a New Molar Socket Classification." Journal of Functional Biomaterials 12, no. 4 (2021): 66. http://dx.doi.org/10.3390/jfb12040066.
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The ideal positioning of immediate implants in molar extraction sockets often requires the osteotomy to be in the interradicular septum, which can be challenging in some cases, with traditional site preparation techniques. Patients who had undergone molar tooth extraction and immediate implant placement at five different centers, and followed up between August 2015 and September 2020, were evaluated. Inclusion criteria were use of the osseodensification technique for implant site preparation. The primary outcome was septum width measurement pre-instrumentation and osteotomy diameter post expansion. Clinical outcomes, such as implant insertion torque (ISQ) and implant survival rate, were also collected. A total of 131 patients, who received 145 immediate implants, were included. The mean overall septum width at baseline was 3.3 mm and the mean osteotomy diameter post instrumentation was 4.65 mm. A total of ten implants failed: seven within the healing period and three after loading; resulting in a cumulative implant survival rate of 93.1%. This retrospective study showed that osseodensification is a predictable method for immediate implant placement with interradicular septum expansion in molar extraction sockets. Furthermore, it allowed the introduction of a new molar socket classification. In the future, well-designed controlled clinical studies are needed to confirm these results and further explore the potential advantages of this technique.
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Valin Rivera, Jose Luis, Edison Gonçalves, Paulo Vinicius Soares, et al. "The Restored Premolars Biomechanical Behavior: FEM and Experimental Moiré Analyses." Applied Sciences 12, no. 13 (2022): 6768. http://dx.doi.org/10.3390/app12136768.
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This study applied the finite element method (FEM) and the moiré strip projection method to evaluate the biomechanical behavior of healthy and endodontic-treated premolar teeth. The finite element method and the moiré strip projection method were applied to evaluate the influence of restored materials in association with cervical lesions and were considered as strain estimates for a tooth sample with 21 units, under loads of 25, 50, 75, and 100 N, frontal and oblique applied. The focused cases were: tooth H healthy; tooth A-MOD amalgam; tooth AL-MOD amalgam + lesion; tooth ALR-MOD amalgam + injury restored; tooth R-MOD resin; tooth RL-MOD resin + lesion; tooth RLR-MOD resin + injury restored. The results obtained by FEM simulation can be considered perfectly validated by the results presented by the experimental moiré projection analysis, demonstrating that the FEM numerical analysis can be used to evaluate the biomechanical behavior of healthy and endodontically treated teeth. Developing an alternative protocol to generate FEM three-dimensional models will lead to a ready and inexpensive tool since there is no need for costly equipment for tooth extraction prognosis.
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Baek, Min-Woo, Hyun-Chang Lim, Kwantae Noh, Seong-Ho Choi, and Dong-Woon Lee. "Dimensional Changes in Extraction Sockets: A Pilot Study Evaluating Differences between Digital and Conventional Impressions." Applied Sciences 12, no. 15 (2022): 7662. http://dx.doi.org/10.3390/app12157662.
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Traditionally, soft tissue records are obtained by dental impression using impression materials; however, accurately recording the soft tissue immediately after tooth extraction is difficult. We measured the tissue changes after tooth extraction and compared two impression modalities (digital versus conventional) by measuring the changes at the soft tissue level. In this case, 15 patients with 17 single extraction sites were enrolled. Conventional impression (CI) using vinyl polysiloxane material and digital impression (DI) using an intraoral scanner were prepared immediately after extraction (T0) and at 2 months post-extraction (T1). Standard tessellation language files were generated for superimposition of the tissue surface. The tissue changes and discrepancies were measured on the superimposed surfaces. The differences in the changes and the discrepancy between the tissue surface impression at each time point were compared. At all measuring levels, the total tissue change was significantly different between groups DI and CI (p < 0.05). DI exhibited a more pronounced tissue surface at both time points, and the total discrepancy was statistically significantly greater at T0 than at T1 (p < 0.05). The values from DI and CI demonstrated small but significantly different for the same study material. The interpretation of such differences may depend on the clinical situation or scientific value.
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Estrela, Carlos, Roberto Holland, Cyntia Rodrigues de Araújo Estrela, Ana Helena Gonçalves Alencar, Manoel Damião Sousa-Neto, and Jesus Djalma Pécora. "Characterization of Successful Root Canal Treatment." Brazilian Dental Journal 25, no. 1 (2014): 3–11. http://dx.doi.org/10.1590/0103-6440201302356.
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Knowing the outcome of root canal treatment (RCT) is determinant to substantiate the clinical decision making process, especially when RCT is weighed against the extraction of natural teeth or replacement by prosthetic elements. The ideal scenario in all clinical situations should combine healing/prevention of disease (apical periodontitis) and the functional retention of the tooth. Understanding the risk factors associated with endodontic failure is a key factor to increase the chances of success. The logical action is to reverse the existing disease, which requires intervention to neutralize the bacterial invasion and disrupt the bacterial biofilm within the complex anatomy. Success is more predictable when the immune host defenses are favorable. However, success has different meanings to the dentist, to the patient and to the tooth itself. The life of an endodontically treated tooth depends on the accuracy of the diagnosis and planning, excellence of disinfection, instrumentation and filling procedures (antimicrobial strategies, root canal shaping and coronal and apical seal) and finally the rehabilitation management. The interpretation of constant or intermittent pain and/or discomfort associated with apical periodontitis (AP) in endodontically treated tooth may be suggestive of endodontic failure. The success features of RCT, namely absence of pain, regression of AP, tight seal of canal and coronal spaces, and recovery of tooth function, must be reevaluated over time. In case of doubt between success and failure, cone beam computed tomography (CBCT) could be indicated for detection and precise localization of AP. The possibility of map reading on CBCT images characterizes the real multidimensional structure, providing accurate information on the presence, absence or regression of AP. The survival of an endodontically treated tooth implies understanding the biological and mechanical outcomes as multifactorial events over the individual's life span. The objective of this review of literature is to discuss relevant factors associated with patient's health, tooth and dentist that could account for a successful RCT.
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Janani, Krishnamachari, Kavalipurapu Venkata Teja, Mohammad Khursheed Alam, et al. "Physics Forceps in Tooth Extraction—A Systematic Review of Randomized Controlled Trials." Applied Sciences 12, no. 1 (2021): 254. http://dx.doi.org/10.3390/app12010254.
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The present systematic review aims to evaluate the efficiency of Physics forceps over the conventional forceps for the extraction of a tooth. The study began with targeted electronic searches of MEDLINE, PubMed, Cochrane, Science Direct and Google Scholar databases. All selected articles were reviewed by four independent reviewers for eligibility. The Cochrane Risk of Bias tool was used to analyze the studies for bias. Due to heterogeneity of the selected studies, a meta-analysis of the current systematic review was not possible. A total of five studies were considered for the final analysis. The risk of bias showed high risk for all five included articles. Various parameters, such as fracture of the root, dry socket, healing, pain, postoperative infection, crown fractures, buccal bone fractures, extraction time, gingival and marginal bone loss, gingival laceration, bleeding and healing were assessed. Based on the data available, there is an insufficient quality of evidence to conclude the superiority of the Physics forceps over conventional forceps.
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Yoon, Sung-Wook, Young Woo Song, Ui-Won Jung, and Jae-Kook Cha. "Radiographic and Histologic Analysis 1–2 Years after Alveolar Ridge Preservation in Maxillary Premolar and Molar: A Case Report." Applied Sciences 11, no. 14 (2021): 6591. http://dx.doi.org/10.3390/app11146591.
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After tooth extraction, notable ridge alterations occur due to resorption of bundle bones during the healing process. In areas with thin or damaged socket walls and multiple adjacent tooth extraction, dimensional changes are more prominent in the marginal proportion. In addition to the marginal changes, upper molar teeth are also vulnerable to pneumatization of the maxillary sinus. To reduce dimensional changes in extraction sockets, alveolar ridge preservation (ARP) is favored by many clinicians in areas where a large amount of dimensional change is expected. This case report presents two cases of ARP using collagenated demineralized bovine bone mineral and demineralized porcine bone mineral in the apically involved upper premolar and molar, respectively. Implants were placed one and two years, respectively, after the ARP. Radiographic analyses of residual bone height and volume were measured using cone-beam-computed tomography (CBCT) and histologic analysis of newly formed mineralized bone and residual graft material percentages were measured from the collected tissue samples using a trephine bur. Implants were placed using a simple technique, without any additional bone grafts at the marginal proportion. The ARP technique could maintain the alveolar bone height and volume, as well as minimize the invasiveness of surgical procedures during implant surgery.
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Tao, Tianjin, Hengyan Liang, Xinyu Yan, et al. "Comparison of Root Parallelism in Extraction Cases Treated with Clear Aligners vs. Fixed Appliances." Applied Sciences 12, no. 22 (2022): 11756. http://dx.doi.org/10.3390/app122211756.
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In the process of orthodontic treatment, root parallelism is related to the relapse of extraction spaces, black triangles, and periodontal health. However, there are few studies on root parallelism in extraction cases with different types of appliances. The objective was to compare the root parallelism in extraction cases treated with clear aligners vs. those treated with fixed appliances by measuring the differences per extraction site and to access the root-movement control capacity of both orthodontic appliances. A retrospective study was conducted on cases in which the first premolars were extracted, treated by clear aligner appliance (“Invisalign” system, 28 patients) or fixed appliance (30 patients). The angulations of the tooth axis (canines, the second premolars, the first molars, and the second molars) were measured to analyze and compare the difference in root parallelism between the two orthodontic appliances. The percentage of root parallelism between the canine and second premolar in both groups had no significant difference. However, judging from the average angle difference value, the fixed appliance might have a greater range in root angulation adjustment than the aligner. In the angulation categories, the aligner mainly showed root apical divergence, while the fixed appliance mainly showed root apical convergence. The dental crown of the molars was mainly non-tipping in both groups, but it could be observed that the dental crown of the maxillary molars had a tendency toward mesial inclination. In conclusion, the same root parallelism and root inclination were obtained in tooth extraction cases whether treated by clear aligners or fixed appliances. This study provides clinicians with more information on the performance of clear aligners and fixed appliances.
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Guo, Yuanjing, Shaofei Jiang, Youdong Yang, Xiaohang Jin, and Yanding Wei. "Gearbox Fault Diagnosis Based on Improved Variational Mode Extraction." Sensors 22, no. 5 (2022): 1779. http://dx.doi.org/10.3390/s22051779.
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Gearboxes are widely used in drive systems of rotating machinery. The health status of gearboxes considerably influences the normal and reliable operation of rotating machinery. When a gearbox experiences tooth failure, a vibration signal with impulse features is excited. However, these impulse features tend to be relatively weak and difficult to extract. To solve this problem, a novel approach for gearbox fault feature extraction and fault diagnosis based on improved variational mode extraction (VME) is proposed. Since the initial value of the desired mode center frequency and the value of the penalty parameter in VME must be assigned, a short-time Fourier transform (STFT) was performed, and a new index, the standard deviation of differential values of envelope maxima positions (SDE), is proposed. The feasibility and effectiveness of the proposed approach was verified by a simulation signal and two datasets associated with a gearbox test bench. The results demonstrate that the VME-based approach outperforms the variational mode decomposition (VMD) approach.
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Alhazmi, Yaser Ali, Amal Mohammed Mobarki, Wala’a Haser Hakami, Hanin Naser Akairi, Yusra Khalid Altherwi, and Mir Faeq Ali Quadri. "Effectiveness of Auditory Distraction and Brief Relaxation Therapy in Reducing Anxiety in Dental Patients Undergoing Extraction: A Randomized Controlled Trial." Applied Sciences 12, no. 1 (2022): 418. http://dx.doi.org/10.3390/app12010418.
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Objective: This study compared the effectiveness of auditory distraction and brief relaxation therapy for reducing anxiety in patients undergoing tooth extraction. Methods: A non-blind, three-armed, randomized control trial was carried out. The targeted study population were patients who needed extraction of a non-restorable and non-mobile molar tooth. Eighty-six patients were recruited; the brief relaxation therapy and auditory distraction groups had 32 participants each, while 10 of the 22 participants in the control group were excluded due to missing data. The Hierarchical Anxiety Questionnaire was used to assess the anxiety level. The Mann–Whitney U or Kruskal–Wallis test was performed to compare means between the groups. The before and after comparisons in each group were carried out using the Wilcoxon Signed-Rank test. The alpha value was set at 0.05, and data were analyzed using SPSS version 24. Results: The mean anxiety score after brief relaxation therapy and auditory distraction had significantly decreased (p < 0.001). Although not significant (p = 0.13), there was a slight increase in the anxiety score of the study participants in the control group just before the extraction procedure. Brief relaxation therapy was significantly effective in reducing anxiety scores in comparison to the control group (MD = 5.87, 95% CI = 2.58, 9.17; p = 0.001), but auditory distraction was not (p = 0.14). Conclusion: Both auditory distraction and brief relaxation therapy were effective in reducing patient anxiety before a dental procedure. Furthermore, it would be interesting to learn if these findings remain consistent for more complex dental procedures, such as surgical removal of an impacted third molar.
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Nisi, Marco, Elisabetta Carli, Stefano Gennai, Francesco Gulia, and Rossana Izzetti. "Hemostatic Agents for the Management of Bleeding Risk Associated with Oral Anticoagulant Therapy Following Tooth Extraction: A Systematic Review." Applied Sciences 12, no. 21 (2022): 11017. http://dx.doi.org/10.3390/app122111017.
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The occurrence of bleeding following dental extraction is a relatively common complication. A history of therapy with oral anticoagulants represents a major favoring factor, both in patients treated with vitamin K-antagonists (especially warfarin) and with direct oral anticoagulants (DOACs). Several local hemostatic measures can be applied to limit the bleeding risk in these patients. The aim of this systematic review is to evaluate what measures can be adopted to limit the bleeding risk following dental extractions in patients treated with oral anticoagulants. A literature search was performed, and 116 articles were retrieved. Titles and abstract analyses excluded 91 articles, and three more articles were excluded following full-text analysis. The systematic review was performed on 22 articles. Among the included articles, 20 studies reported on patients treated with warfarin, and two studies on patients treated with DOACs. The agents employed included local intra-alveolar agents, tranexamic acid, and PRF. The included studies were all at moderate/high risk of bias. Moreover, limited evidence is available on hemostasis in patients treated with DOACs. The available evidence hinders stating the superiority of one agent over the others. Further research is advised to increase the level of evidence of the application of hemostatic agents in patients treated with oral anticoagulants.
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Einy, Shmuel, Katia Avezov, and Dror Aizenbud. "Geminated Maxillary Incisors: The Success of an Orthodontic Conservative Approach: 15 Years Follow-Up Study." Applied Sciences 12, no. 3 (2022): 1389. http://dx.doi.org/10.3390/app12031389.
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Tooth gemination is often presented clinically and radiologically as merged crowns or “megadonts” with or without a longitudinal fissure, single root, and a single pulp chamber. The increased mesiodistal width of these teeth results in poor anterior aesthetics, anterior crowding, and incisor rotation. Our aim is to present a conservative non-extraction orthodontic approach that provides both good aesthetics and long-term stability. It aims to achieve extra space to incorporate the megadonts into the dental arch and to exceed “super” class I dental relationships. Accordingly, this study shows that geminated teeth were successfully retained by means of conservative non-extraction orthodontic mechanotherapy and without premolar extractions or enamel reduction. It demonstrated stability during a long-term 15-year follow-up, in addition to high patient satisfaction, good aesthetics, and periodontal health. The solution protocol is definitive and achieved the aesthetic, psychological, and functional objectives at a feasible cost. Thus, this treatment has proven to be preferable to other alternative surgical prosthodontic and endodontic approaches in terms of its long-term stability, and by providing a solution that does not necessitate further multidisciplinary interventions. Dental practitioners in the fields of pediatric dentistry, endodontics and prosthodontics should be well aware of this option.
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Ogasawara, Keita, Masahiro To, Yu-Hao Liu, Toshimitsu Okudera, Takatsuna Nakamura, and Masato Matsuo. "Application of deproteinized bovine bone mineral as proangiogenic scaffold for alveolar bone formation in beagle dogs." Microscopy 70, no. 4 (2021): 382–87. http://dx.doi.org/10.1093/jmicro/dfab007.
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Abstract Alveolar bone repair after tooth extraction is essential after oral surgeries. Various grafting materials are used to promote the regeneration of lost alveolar bone. This study analysed the morphological features of the tissue regeneration process using deproteinized bovine bone mineral (DBBM). DBBM was used to densely fill the extraction sockets in beagle dogs. Following resin casting of the vasculature, stereomicroscopy and scanning electron microscopy were used to observe blood vessels and hard tissues in haematoxylin and eosin-stained sections on postoperative days 14, 30 and 90 in conjunction with vascular endothelial growth factor (VEGF) immunostaining to evaluate alveolar bone vascularization. On day 14 post-operation, the DBBM granules tightly filled the extraction sockets, maintained alveolar margin height and formed a scaffold for aiding angiogenesis and new bone formation. On day 30, new bone formation was observed around the DBBM granules. By day 90, bone tissue regeneration progressed in both groups but was more pronounced in the DBBM group. Alveolar margin height was maintained in the DBBM group throughout the study. Furthermore, VEGF expression in the DBBM group was detected around newly formed bone. We conclude that DBBM acts as a suitable scaffold for new bone generation, as well as angiogenesis around healing alveolar bone, and that it has the potential to play a key role in vascularization and bone formation.
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Pasternak, Marcin, and Jarosław Woroń. "Acute endodontic pain." BÓL 21, no. 1 (2020): 1–7. http://dx.doi.org/10.5604/01.3001.0014.1574.
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Dental pain is amongst the most common types of or ofacial pain, it significantly reduces quality of life in patients and is regarded as a serious public health issue in many countries, furthermore it is main reason of seeking emergency dental treatment. Usually dental pain is caused by pulp and periapical conditions and is inflammatory. The two key components of dental pain are the activity of nerve fibers and alterations in microciculation. Anatomical and neurophysiological differences affecting mentioned type of pain were presented in this paper as well as mechanisms of dental pain form ation, clinical implications of hyperalgesia, allodynia, reffered pain phenomena and therapeutic procedures. The most optimal way of preoperative pain management is implementation of causal treatment as soon as possible, which includes tooth extraction or endodontic intervention. During root canal treatment complete pulp removal is followed by exact chemomechanical preparation of the entire root-canal system with the use of instrumentation and plentiful irrigation and dense obturation. Endodontic therapy allows tooth preservation and periapical tissues healing. Intraoperative pain is controlled with the means of proper local anaesthesia, depending on clinical situation using not only first choice techniques as regional block and infiltrative anaesthesia but also additional methods like intraligammentary, intraosseus and intrapulpal injections. Postprocedural pain management starts during anaesthesia. In article additional pharmacological and non-pharmacological strategies helpful in treating these conditions, providing better effectiveness of local anaesthesia that is difficult in tissue inflammation and decreasing and even preventing development postendodontic pain – common complication of root canal treatment.
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Eggers, Benedikt, Matthias Bernhard Stope, Alexander Mustea, Marjan Nokhbehsaim, Nils Heim, and Franz-Josef Kramer. "Non-Invasive Physical Plasma Treatment after Tooth Extraction in a Patient on Antiresorptive Medication Promotes Tissue Regeneration." Applied Sciences 12, no. 7 (2022): 3490. http://dx.doi.org/10.3390/app12073490.
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Postoperative tissue regeneration can be negatively affected by bisphosphonate administration, especially in patients with oncologic diseases. A serious complication of bisphosphonate therapy is the medication-related osteonecrosis of the jaw (MRONJ), which can be observed mainly after dental surgery. MRONJ is a progressive destruction of the bone that requires patients to stay in hospital for extended periods of time. For this reason, primary wound closure is particularly important in surgical procedures. In the case of wound dehiscence, there is a very high risk for MRONJ. In recent years, non-invasive physical plasma (NIPP) has become known for improving wound healing on the one hand, but also for its promising efficacy in cancer therapy on the other hand. We report on a 63-year-old patient with a history of multiple myeloma and receiving zoledronate, who developed wound dehiscence after tooth extraction. NIPP treatment resulted in complete epithelialization of the entire wound dehiscence. In conclusion, the use of NIPP in patients receiving antiresorptive drugs seems to support tissue regeneration and thus could be an important tool for the prevention of MRONJ.
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Han, Xiaoning, Xiaohui Wang, Yuquan Leng, and Weijia Zhou. "A Plane Extraction Approach in Inverse Depth Images Based on Region-Growing." Sensors 21, no. 4 (2021): 1141. http://dx.doi.org/10.3390/s21041141.
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Planar surfaces are prevalent components of man-made indoor scenes, and plane extraction plays a vital role in practical applications of computer vision and robotics, such as scene understanding, and mobile manipulation. Nowadays, most plane extraction methods are based on reconstruction of the scene. In this paper, plane representation is formulated in inverse-depth images. Based on this representation, we explored the potential to extract planes in images directly. A fast plane extraction approach, which employs the region growing algorithm in inverse-depth images, is presented. This approach consists of two main components: seeding, and region growing. In the seeding component, seeds are carefully selected locally in grid cells to improve exploration efficiency. After seeding, each seed begins to grow into a continuous plane in succession. Both greedy policy and a normal coherence check are employed to find boundaries accurately. During growth, neighbor coplanar planes are checked and merged to overcome the over-segmentation problem. Through experiments on public datasets and generated saw-tooth images, the proposed approach achieves 80.2% CDR (Correct Detection Rate) on the ABW SegComp Dataset, which has proven that it has comparable performance with the state-of-the-art. The proposed approach runs at 5 Hz on typical 680 × 480 images, which has shown its potential in real-time practical applications in computer vision and robotics with further improvement.
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Bui, Toan Huy, Kazuhiko Hamamoto, and May Phu Paing. "Deep Fusion Feature Extraction for Caries Detection on Dental Panoramic Radiographs." Applied Sciences 11, no. 5 (2021): 2005. http://dx.doi.org/10.3390/app11052005.
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Caries is the most well-known disease and relates to the oral health of billions of people around the world. Despite the importance and necessity of a well-designed detection method, studies in caries detection are still limited and show a restriction in performance. In this paper, we proposed a computer-aided diagnosis (CAD) method to detect caries among normal patients using dental radiographs. The proposed method mainly consists of two processes: feature extraction and classification. In the feature extraction phase, the chosen 2D tooth image was employed to extract deep activated features using a deep pre-trained model and geometric features using mathematic formulas. Both feature sets were then combined, called fusion feature, to complement each other defects. Then, the optimal fusion feature set was fed into well-known classification models such as support vector machine (SVM), k-nearest neighbor (KNN), decision tree (DT), Naïve Bayes (NB), and random forest (RF) to determine the best classification model that fit the fusion features set and perform the most preeminent result. The results show 91.70%, 90.43%, and 92.67% for accuracy, sensitivity, and specificity, respectively. The proposed method has outperformed the previous state-of-the-art and shows promising results when none of the measured factors is less than 90%; therefore, the method is promising for dentists and capable of wide-scale implementation caries detection in hospitals.
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Grzeszkowski, Mateusz, Sebastian Nowoisky, Philipp Scholzen, et al. "Classification of gear pitting damage using vibration measurements." tm - Technisches Messen 88, no. 5 (2021): 282–93. http://dx.doi.org/10.1515/teme-2021-0010.
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Abstract In future aero engines, a planetary gearbox is to be integrated between fan and turbine to increase the efficiency and bypass ratio. This gearbox has to be monitored during operation to detect possible gearbox faults such as gear wear or gear pitting at an early stage. This paper presents a method consisting of vibration measurement, sensor-dependent feature extraction and support-vector machine (SVM)-based classification of pitting for gear condition monitoring. Several gears were loaded with a constant torque on a standardized back-to-back test rig to provoke pitting, and the pitting amount was captured during the tests with a camera. Features are extracted from accelerometers and an acoustic emission sensor, and based on the results of the visually recorded pitting surface, SVM classification is applied to identify the pitting defect. In this contribution, two different SVM classification approaches are investigated. One approach uses a Two-Class SVM, where tests from one gearset are used for SVM training and another approach utilizes a One-Class SVM based on outlier detection. Both methods show that single tooth pitting defects with a relative pitting area of less than 1 % can be effectively identified, whereas the One-Class SVM method showed a higher pitting detection accuracy.
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Grassi, Andrea, Lucia Memè, Enrico M. Strappa, Emanuele Martini, and Fabrizio Bambini. "Modified Periosteal Inhibition (MPI) Technique for Extraction Sockets: A Case Series Report." Applied Sciences 12, no. 23 (2022): 12292. http://dx.doi.org/10.3390/app122312292.
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Several Alveolar Ridge Preservation (ARP) procedures have been proposed over the years. The purpose of this study was to describe the new Modified Periosteal Inhibition (MPI) technique for ARP. Seven patients were enrolled (age range: 28–72 years old; 5 males, 2 females). In total, nine hopeless teeth were treated. Following the elevation of a full-thickness flap, atraumatic tooth extraction was conducted, preserving the buccal bone of the alveolar socket. OsteoBiol® Lamina Soft (Tecnoss®, Giaveno, Italy), 0.5 mm thick, was suitably shaped (8–10 mm in height, extending from the mesial and to the distal corners of the socket). The lamina was gently positioned between the buccal periosteum and the buccal bone plate. Tisseel® (Baxter Healthcare Corporation, Deerfield, IL, USA) was applied to seal the cortical membrane. The flaps were sutured with PTFE 4-0 (Omnia, Fidenza, Italy). Postoperative instructions were provided. Patients were strictly monitored during the follow-up. No early or late biological complications were experienced. Cone Beam Computed Tomography (CBCT) exams were performed at baseline and 4 months later. The thickness of the buccal cortical bone at baseline was 1.18 ± 0.57 mm. The pre-operative and post-operative ridge widths were 10.74 ± 1.54 mm and 11.16 ± 1.57 mm, respectively. A horizontal ridge increase of 0.41 ± 0.21 mm was observed during the healing period. At 4 months of healing, the bone volume was adequate for implant placement and no additional bone regeneration procedures were required. MPI technique was effective in preventing the horizontal contraction of the post-extraction socket. Further studies will be needed in the future to confirm our positive results.
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Nguyen, Cong Dai, Cheol Hong Kim, and Jong-Myon Kim. "Gearbox Fault Identification Model Using an Adaptive Noise Canceling Technique, Heterogeneous Feature Extraction, and Distance Ratio Principal Component Analysis." Sensors 22, no. 11 (2022): 4091. http://dx.doi.org/10.3390/s22114091.
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Using an adaptive noise canceling technique (ANCT) and distance ratio principal component analysis (DRPCA), this paper proposes a new fault diagnostic model for multi-degree tooth-cut failures (MTCF) in a gearbox operating at inconsistent speeds. To account for background and disturbance noise in the vibration characteristics of gear failures, the proposed approach employs ANCT in the first stage to optimize vibration signals. The ANCT applies an adaptive denoising technique to each basic frequency segment in the whole frequency response of vibrations. Following that, a novel DRPCA is used to extract the discriminating low-dimensional features. The DRPCA initially determines each feature’s relative proximity to fault categories by computing the average Euclidian distance ratio between similar and dissimilar classes. The most discriminatory features with the lowest dimensions are selected, as determined by principal component analysis (PCA). The new DRPCA is created by combining distance ratio–based feature inspection with PCA. The optimal feature set containing the most discriminative features is then fed to the support vector machine classifier to identify multiple failure categories. The experimental results indicate that the proposed model outperforms the state-of-art approaches and offers the highest identification accuracy.
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Kim, Hee Jin, Ye Joon Jo, Jun Seok Choi, Hyo Joon Kim, Jin Kim, and Seong Yong Moon. "Anatomical Risk Factors of Inferior Alveolar Nerve Injury Association with Surgical Extraction of Mandibular Third Molar in Korean Population." Applied Sciences 11, no. 2 (2021): 816. http://dx.doi.org/10.3390/app11020816.
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The purpose of this study was to analyze the incidence and risk factors of possible inferior alveolar nerve (IAN) injury after extraction of the mandibular third molars. A total of 6182 patients were examined for 10,310 mandibular third molar teeth. Panoramic radiography and patients’ medical records were used to analyze age, gender, and impaction pattern of the mandibular third molar. Cone beam computed tomography (CBCT) was used to investigate the detailed pathway of the inferior alveolar nerve and evaluated the presence of symptoms of nerve damage after tooth extraction. In CBCT, 6283 cases (61%) of the inferior alveolar nerve were actually in contact with the root of the mandibular third molar. The correlation with the panoramic signs of root darkening (p < 0.001), root deflection (p < 0.001), interruption of the IAN (p < 0.001), diversion of the IAN (p < 0.001), and narrowing of the IAN (p < 0.001) had statistical significance. Of the 4708 patients who underwent surgical extraction, 31 (0.658%) complained of nerve damage. Among them, 30 patients (0.637%) complained of symptoms of inferior alveolar nerve damage, and 1 patient (0.02%) complained of symptoms of lingual nerve damage. There was a significant correlation with IAN injury in cases where the roots became dark at the IAN area (p = 0.018) and there was diversion of the IAN at the root area (p = 0.041). When the narrowing of the IAN and the lingual driving pathway of the inferior alveolar nerve appeared simultaneously in CBCT, the risk of IAN injury was high.
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Goldberger, Tomer, Eyal Rosen, Nuphar Blau-Venezia, Aviad Tamse, and Dan Littner. "Pathognomonic Combination of Clinical Signs for Diagnosis of Vertical Root Fracture: Systematic Review of the Literature." Applied Sciences 11, no. 22 (2021): 10893. http://dx.doi.org/10.3390/app112210893.
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Introduction: Vertical root fracture (VRF) is a root-canal treatment complication and is a major reason for extraction of the root-canal-treated teeth. The diagnosis of VRF can be complicated because of absence of specific signs, symptoms, and radiographic features. A combination that includes the presence of deep pocket and a sinus tract in root-canal-treated tooth was proposed as a pathognomonic for VRF. The purpose of this study was to systematically search and evaluate the literature regarding the correlation between the clinical signs considered pathognomonic for the diagnosis of VRF, with the actual reference standard by means of systematic review of the literature. Methods: A systematic search of the literature was performed to identify studies evaluating the clinical signs considered pathognomonic for the diagnosis of VRF. The following databases were searched: Medline (PubMed), Scopus, and Cochrane Central. The identified studies were subjected to strict inclusion and exclusion criteria. Results: Initially, 1141 possible relevant articles were identified. After title and abstract screening, 40 articles were subjected to a full-text evaluation, 3 articles met the inclusion criteria and contained data regarding the prevalence of the pathognomonic combination in VRF’s-confirmed teeth. The presence of deep pocket and a sinus tract in endodontically treated teeth was found in 28% of the cases. Conclusion: To date, the current scientific knowledge regarding the correlation between the clinical symptoms considered pathognomonic for VRF diagnosis in the root-canal-treated tooth and the actual reference standard is quite low.
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Bugshan, Amr S., and Yousif A. Al-Dulaijan. "A Multidisciplinary Pathway for the Diagnosis and Prosthodontic Management of a Patient with Medication-Related Osteonecrosis of the Jaw (MRONJ)." Applied Sciences 12, no. 16 (2022): 8202. http://dx.doi.org/10.3390/app12168202.
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Background: Medication-Related Osteonecrosis of the Jaw (MRONJ) can occur as an adverse reaction to several antiresorptive medications such as bisphosphonate. It presents clinically as a necrotic exposed bone. Several factors including tooth extraction and ill-fitting dentures increase the risk of osteonecrosis development. Case Report: A 72-year-old female who had an ill-fitting partial denture that caused an exposed necrotic bone and traumatic ulcer on the left posterior mandible. Bony sequestrums were removed and submitted for histological examination, which confirmed the diagnosis of MRONJ. Conclusions: This case illustrates the importance of identifying all risk factors associated with MRONJ by dentists to reduce its development in patients receiving antiresorptive medications. Moreover, patients at risk of MRONJ development should be screened carefully on a regular basis and all dental risk factors should be adjusted or removed.
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Nguyen, Cong Dai, Zahoor Ahmad, and Jong-Myon Kim. "Gearbox Fault Identification Framework Based on Novel Localized Adaptive Denoising Technique, Wavelet-Based Vibration Imaging, and Deep Convolutional Neural Network." Applied Sciences 11, no. 16 (2021): 7575. http://dx.doi.org/10.3390/app11167575.
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This paper proposes an accurate and stable gearbox fault diagnosis scheme that combines a localized adaptive denoising technique with a wavelet-based vibration imaging approach and a deep convolution neural network model. Vibration signatures of a gearbox contain important fault-related information. However, this useful fault-related information is often overwhelmed by random interference noises. Furthermore, the varying speed of gearboxes makes it difficult to distinguish the fault-related frequencies from the interference noises. To obtain a noise-free signal for extraction of fault-related information under variable speed conditions, first, a new localized adaptive denoising technique (LADT) is applied to the vibration signal. The new localized adaptive denoising technique results in optimized vibration sub-bands with negligible background noise. To obtain fault-related information, the wavelet-based vibration imaging approach (WVI) is applied to the denoised vibration signal. The wavelet-based vibration imaging approach decomposes the vibration signal into different time–frequency scales, these scales are reflected by a two-dimensional image called a scalogram. The scalograms obtained from the wavelet-based vibration imaging approach are provided as an input to the deep convolutional neural network architecture (DCNA) for extraction of discriminant features and classification of multi-degree tooth faults (MDTFs) in a gearbox under variable speed conditions. The proposed scheme outperforms the already existing state-of-the-art gearbox fault diagnosis methods with the highest classification accuracy of 100%.
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Hirsch, Vivian, Alice Blufstein, Christian Behm, and Oleh Andrukhov. "The Alterations in CD14 Expression in Periodontitis: A Systematic Review." Applied Sciences 11, no. 5 (2021): 2444. http://dx.doi.org/10.3390/app11052444.
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Objective: Cluster of differentiation (CD14) is an important protein involved in activating toll-like receptors by bacterial components. It exists as either a transmembrane or soluble protein, called mCD14 or sCD14, respectively. Several studies show that CD14 regulates the inflammatory response to periodontal pathogens, and its expression is altered in periodontitis, an inflammatory disease of tooth-supporting tissues. It is the intent of this review to investigate the levels of expression of mCD14 and sCD14 in peripheral blood monocytes, saliva, gingival crevicular fluid, and gingival tissue biopsies in periodontitis patients. Methods: PubMed, Scopus, Ovid/Medline, Embase, and the Cochrane Library were consulted for the online literature search. To ensure methodical quality, titles and abstracts were reviewed in accordance to the PRISMA guidelines. Data extraction and evaluation of the full texts were executed in agreement with the GRADE approach. Results: This systematic review shows that mCD14 levels are decreased in peripheral blood monocytes of periodontitis patients in comparison to healthy patients, while sCD14 levels in sera, gingival crevicular fluid (GCF), and biopsies of periodontitis patients have a tendency to be increased in comparison to healthy controls. The evaluation of CD14 in gingival biopsies and periodontal tissues elucidated the fact that interpretation of the data obtained with qPCR, ELISA, and flow cytometry is questionable.
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Roccuzzo, Andrea, Pedro Molinero-Mourelle, Martina Ferrillo, et al. "Type I Collagen-Based Devices to Treat Nerve Injuries after Oral Surgery Procedures. A Systematic Review." Applied Sciences 11, no. 9 (2021): 3927. http://dx.doi.org/10.3390/app11093927.
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The regeneration of nerve injuries after oral surgery procedures is a quite often attempted procedure in dental medicine. Despite several proposed technical approaches, there is still a lack of consensus on which should be considered the gold standard procedure, even-though in the last decades, the use of collagen-based devices allowing a tension-free direct neurorrhaphy has been used. A systematic search of multiple electronic databases and hand searching was conducted to assess the level of evidence behind the use of type I collagen devices to treat nerve injuries after oral surgery procedures. After screening, four articles (one case series and three retrospective studies) including overall 65 patients suffering from inferior alveolar (IAN)/lingual nerve (LN) injury after mandibular wisdom tooth extraction, met the inclusion criteria and could be included. The Oxford Centre for evidence-based medicine (OCEBM) scaling system was used to evaluate the quality of the included studies. Positive clinical results in terms of sensorial improvements were recorded at least 3 months after surgery, even-though the overall level of evidence is low. The use of collagen membranes to enhance nerve regeneration in oral surgery results in promising results. Nevertheless, additional clinical comparative trials with larger sample sizes are needed.
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Marenzi, Gaetano, Roberta Gasparro, Mauro Mariniello, Gilberto Sammartino, Claudia Capone, and Alessandro Espedito di Lauro. "Advanced Platelet-Rich Fibrin as a Therapeutic Option in the Treatment of Dry Socket: Literature Review and Case Series." Applied Sciences 11, no. 20 (2021): 9474. http://dx.doi.org/10.3390/app11209474.
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Alveolar osteitis (AO) is one of the complications that occur after tooth extraction. The aim of this study has been to evaluate the efficacy of Advanced Platelet-rich Fibrin (A-PRF) in the management of pain and the acceleration of wound healing in the treatment of AO. Consecutive patients who were diagnosed with AO, recruited from patients referred to the Oral Surgery Department of the University of Naples Federico II, were enrolled. After local anesthesia, the dry socket was curetted and irrigated with saline. The Platelet-rich Fibrin (PRF) clot was placed in the socket and then covered with an A-PRF membrane. Clinical parameters, such as the degree of pain and rate of granulation tissue (GT) formation, were measured before treatment and after 1, 3, 7, 14, and 21 days. The Friedman test for dependent samples was used to detect the treatment and time effect. Four patients with established AO were included. On all the examination days, the post-operative recovery was uneventful. The pain scores progressively reduced, from an average of 8.5 before treatment to 0.25 on the third day, and the GT formation improved over time. The use of A-PRF in the treatment of AO significantly reduced the pain level and enhanced the wound-healing process.
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Buonavoglia, Alessio, Adriana Trotta, Michele Camero, Marco Cordisco, Michela Maria Dimuccio, and Marialaura Corrente. "Streptococcus mutans Associated with Endo-Periodontal Lesions in Intact Teeth." Applied Sciences 12, no. 22 (2022): 11837. http://dx.doi.org/10.3390/app122211837.
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A massive periodontal destruction can affect the root canal (RC) system and potentially expose the pulpo-dentinal complex to opportunistic bacteria. Streptococcus mutans is a major pathogen of human caries and periodontal diseases, and its virulence mostly resides in the ability to adhere to collagen and form biofilms, due to collagen-binding proteins (CBPs) Cnm and Cbm. Seventeen patients affected by severe endo-periodontal lesions without caries and/or exposure of pulpal tissue were subjected to tooth extraction and samples for microbiological investigation were collected from the root surface (RS) and RC. The collected swabs were cultivated and subjected to the quantitative real-time PCR (qPCR) for the detection of S. mutans and to the PCR for the cnm/cbm genes investigation, followed by next-generation sequencing (NGS). S. mutans DNA was detected in 12/17 (70.5%) RS samples and in 8/17 (47.0%) RC samples. In the CBPs screening of positive samples, the cnm gene was detected in 4/12 (33.3%) RS and in 1/8 (12.5%) RC samples, whilst all the samples tested negative for the cbm gene. The presence of the cnm gene could enhance the local virulence of the pathogens. Therefore, S. mutans have to be included as potential periodontopathogen bacterium in severe or refractory forms of periodontal diseases.
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Wei, Meirong, Yan Liu, Tao Zhang, Ze Wang, and Jiaming Zhu. "Fault Diagnosis of Rotating Machinery Based on Improved Self-Supervised Learning Method and Very Few Labeled Samples." Sensors 22, no. 1 (2021): 192. http://dx.doi.org/10.3390/s22010192.
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Convolution neural network (CNN)-based fault diagnosis methods have been widely adopted to obtain representative features and used to classify fault modes due to their prominent feature extraction capability. However, a large number of labeled samples are required to support the algorithm of CNNs, and, in the case of a limited amount of labeled samples, this may lead to overfitting. In this article, a novel ResNet-based method is developed to achieve fault diagnoses for machines with very few samples. To be specific, data transformation combinations (DTCs) are designed based on mutual information. It is worth noting that the selected DTC, which can complete the training process of the 1-D ResNet quickly without increasing the amount of training data, can be randomly used for any batch training data. Meanwhile, a self-supervised learning method called 1-D SimCLR is adopted to obtain an effective feature encoder, which can be optimized with very few unlabeled samples. Then, a fault diagnosis model named DTC-SimCLR is constructed by combining the selected data transformation combination, the obtained feature encoder and a fully-connected layer-based classifier. In DTC-SimCLR, the parameters of the feature encoder are fixed, and the classifier is trained with very few labeled samples. Two machine fault datasets from a cutting tooth and a bearing are conducted to evaluate the performance of DTC-SimCLR. Testing results show that DTC-SimCLR has superior performance and diagnostic accuracy with very few samples.
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Khan, Zafar Ali, Namdeo Prabhu, Naseer Ahmed, et al. "A Comparative Study to Evaluate the Effect of Honey and Zinc Oxide Eugenol Dressing for the Treatment of Dry Socket: A Double-Blind Randomized Controlled Trial." Applied Sciences 12, no. 1 (2021): 6. http://dx.doi.org/10.3390/app12010006.
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Dry socket is a common postoperative complication secondary to any tooth extraction but is more commonly associated with mandibular third molars. Dry socket has been treated with various treatment modalities with different success rates. This study aimed to evaluate the effect of using honey and zinc oxide eugenol as an intra-socket medicament for the treatment of dry sockets. Ninety patients were divided into three groups as follows: Group 1 “honey”: 30 patients; Group 2 “zinc oxide eugenol”: 30 patients; and Group 3 “control”: 30 patients. Pre-medication and post-medication pain scores at different time intervals were measured on a verbal rating scale. The mean ages of the patients in each of the groups were as follows: Group 1: 44.26 ± 14.14; Group 2: 45.30 ± 18.08; and Group 3: 51.93 ± 9.75. As regards verbal rating scale pain scores, a significant difference was noted in patients that belonged to Groups 1 and 2, with an immediate reduction in post-medication pain scores. However, patients belonging to Group 3 reported pain and discomfort for over a week. The use of honey and zinc oxide eugenol resulted in significant immediate post-medication pain scores in patients as compared to the control group. Therefore, both honey and zinc oxide eugenol can be used as treatment options for dry socket patients.
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Vardhan, Pabbati Krishna, Rashmi Paramashivaiah, Munivenkatappa Laxmaiah Venkatesh Prabhuji, et al. "The Effect of Photodynamic Therapy on the Early Outcome of Implants Placed on Patients with Periodontitis." Photonics 9, no. 7 (2022): 480. http://dx.doi.org/10.3390/photonics9070480.
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Background: Immediate implant is a subtype of implant that is placed following tooth extraction within the socket without further delay. These implants are known to preserve the alveolar bone and minimize the total number of surgical interventions in a patient. 4 Photodynamic therapy (PDT) augments nonsurgical periodontal therapy using antibacterial mechanisms. PTD can be more effective in conjunction with scaling and root planing (SRP). The aim of this study is to assess the effects of PDT on the early outcomes of implants placed on patients with periodontitis with and without SRP at 9 months of follow-up. Materials and methods: A total of 23 implants were placed in 14 patients, with 11 in the test group and 12 in the control group. SRP was carried out prior to immediate implant placement in control sites, and PDT adjunctive to SRP (SRP + PDT) was performed in test sites before immediate implant placement. Plaque index, gingival index, probing pocket depth, clinical attachment level, and radiovisiographs were procured at baseline, 3 months, 6 months, and 9 months. Primary stability was examined at the time of implant placement, and the healing index was recorded a week later. Results: At the end of the 9 months of the study period, (SRP + PDT) group had a mean marginal bone loss of 0.95 mm, and the control group had 1.08 mm. Clinical parameters such as plaque index, gingival index, clinical attachment level, and probing depth showed definitive improvement after 9 months, compared with the baseline, but when the test and control groups were compared, the difference was statistically significant for plaque index and probing depth. The implants in both groups were followed up for a period of 9 months. There was an improvement in marginal bone loss but was not statistically significant. The survival of immediate implants in the PDT group was not different from those in the scaling and root planing group. Conclusion: The effect of PTD can be beneficially used as an adjunct to SRP. However, the effects were not significant. Photodynamic therapy can be effectively used as an adjunct to SRP owing to the better outcomes using PDT.
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Vollmer, Andreas, Michael Vollmer, Gernot Lang, et al. "Performance Analysis of Supervised Machine Learning Algorithms for Automatized Radiographical Classification of Maxillary Third Molar Impaction." Applied Sciences 12, no. 13 (2022): 6740. http://dx.doi.org/10.3390/app12136740.
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Background: Oro-antral communication (OAC) is a common complication following the extraction of upper molar teeth. The Archer and the Root Sinus (RS) systems can be used to classify impacted teeth in panoramic radiographs. The Archer classes B-D and the Root Sinus classes III, IV have been associated with an increased risk of OAC following tooth extraction in the upper molar region. In our previous study, we found that panoramic radiographs are not reliable for predicting OAC. This study aimed to (1) determine the feasibility of automating the classification (Archer/RS classes) of impacted teeth from panoramic radiographs, (2) determine the distribution of OAC stratified by classification system classes for the purposes of decision tree construction, and (3) determine the feasibility of automating the prediction of OAC utilizing the mentioned classification systems. Methods: We utilized multiple supervised pre-trained machine learning models (VGG16, ResNet50, Inceptionv3, EfficientNet, MobileNetV2), one custom-made convolutional neural network (CNN) model, and a Bag of Visual Words (BoVW) technique to evaluate the performance to predict the clinical classification systems RS and Archer from panoramic radiographs (Aim 1). We then used Chi-square Automatic Interaction Detectors (CHAID) to determine the distribution of OAC stratified by the Archer/RS classes to introduce a decision tree for simple use in clinics (Aim 2). Lastly, we tested the ability of a multilayer perceptron artificial neural network (MLP) and a radial basis function neural network (RBNN) to predict OAC based on the high-risk classes RS III, IV, and Archer B-D (Aim 3). Results: We achieved accuracies of up to 0.771 for EfficientNet and MobileNetV2 when examining the Archer classification. For the AUC, we obtained values of up to 0.902 for our custom-made CNN. In comparison, the detection of the RS classification achieved accuracies of up to 0.792 for the BoVW and an AUC of up to 0.716 for our custom-made CNN. Overall, the Archer classification was detected more reliably than the RS classification when considering all algorithms. CHAID predicted 77.4% correctness for the Archer classification and 81.4% for the RS classification. MLP (AUC: 0.590) and RBNN (AUC: 0.590) for the Archer classification as well as MLP 0.638) and RBNN (0.630) for the RS classification did not show sufficient predictive capability for OAC. Conclusions: The results reveal that impacted teeth can be classified using panoramic radiographs (best AUC: 0.902), and the classification systems can be stratified according to their relationship to OAC (81.4% correct for RS classification). However, the Archer and RS classes did not achieve satisfactory AUCs for predicting OAC (best AUC: 0.638). Additional research is needed to validate the results externally and to develop a reliable risk stratification tool based on the present findings.
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D’Angeli, Giacomo, Francesca Zara, Alessio Belloni, et al. "Cone Beam Computer Tomography and Histological Evaluation of Dental Follicle of Impacted Lower Third Molar Germs in Teens: A Histo-Radiographic Correlation Study in a Case Series." Applied Sciences 11, no. 12 (2021): 5682. http://dx.doi.org/10.3390/app11125682.
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The dental follicle (DF) is the tissue that surrounds the crown of the developing tooth. In X-ray, images it appears as a radiolucent area. The removal of an impacted mandibular third molar is a common procedure in oral surgery. The radiographic evidence of pathology, commonly defined as a pericoronal radiolucency measuring at least mm 2.5 mm in any dimension, is accepted for the extraction of impacted mandibular third molars. Mesioangular impactions are usually more closely placed to the inferior alveolar canal, and the use of cone beam computer tomography (CBCT) before the removal of impacted mandibular third molars has been reported to be appropriate in these cases. The aim of this study was to evaluate the microscopic features of radiographically normal DFs associated with mesioangular impacted mandibular third molars examined through CBCT. Thirteen mesioangular impacted third molars from ten patients (5 males and 5 females, mean age ± SD: 15.1 ± 1.66) with a maximum width of the DF <2.5 mm, as digitally established by CBCT, were included in this study. All the DFs associated with the removed third molars were examined histologically through the analysis of different variables. The mean (±SD) and range of the maximum width of the DFs were 1.35 (±0.47) mm and 0.71–2.21 mm, respectively. Nine (69.23%) DFs showed odontogenic remnants, five (38.46%) showed focal squamous metaplasia and eight (61.53%) mild mesenchymal myxoid degeneration. The maximum width of the DF failed to show any significant correlation with all the histological variables considered in this study. Aware of the limited number of patients included in this study, the histo-radiographic correlation in our case series confirm data in the literature, according to which normal pericoronal imaging may be associated with DF tissue changes/variations that in turn are potentially associated with the development of pathologies including odontogenic cysts and tumors. Whether these changes/variations are enough to make prophylactic germectomy of impacted third molars the standard by themselves remains to be established. However, they require accurate correlations with the radiographic data for the appropriate histologic assessment of a DF.
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Albalawi, Farraj, and Khalid A. Alamoud. "Trends and Application of Artificial Intelligence Technology in Orthodontic Diagnosis and Treatment Planning—A Review." Applied Sciences 12, no. 22 (2022): 11864. http://dx.doi.org/10.3390/app122211864.
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Artificial intelligence (AI) is a new breakthrough in technological advancements based on the concept of simulating human intelligence. These emerging technologies highly influence the diagnostic process in the field of medical sciences, with enhanced accuracy in diagnosis. This review article intends to report on the trends and application of AI models designed for diagnosis and treatment planning in orthodontics. A data search for the original research articles that were published over the last 22 years (from 1 January 2000 until 31 August 2022) was carried out in the most renowned electronic databases, which mainly included PubMed, Google Scholar, Web of Science, Scopus, and Saudi Digital Library. A total of 56 articles that met the eligibility criteria were included. The research trend shows a rapid increase in articles over the last two years. In total: 17 articles have reported on AI models designed for the automated identification of cephalometric landmarks; 12 articles on the estimation of bone age and maturity using cervical vertebra and hand-wrist radiographs; two articles on palatal shape analysis; seven articles for determining the need for orthodontic tooth extractions; two articles for automated skeletal classification; and 16 articles for the diagnosis and planning of orthognathic surgeries. AI is a significant development that has been successfully implemented in a wide range of image-based applications. These applications can facilitate clinicians in diagnosing, treatment planning, and decision-making. AI applications are beneficial as they are reliable, with enhanced speed, and have the potential to automatically complete the task with an efficiency equivalent to experienced clinicians. These models can prove as an excellent guide for less experienced orthodontists.
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Hajrah Tariq, Mehak Baber Ali, Zarnab Rizwan, Ghina Rizwan, Sidra Leghari, and Alia Ahmed. "Intentional re-implantation in a left mandibular second molar with broken file in apical third of mesiobuccal root: a case report." Journal of the Pakistan Medical Association, August 3, 2022. http://dx.doi.org/10.47391/jpma.4774.
Full textAbstract:
Intentional re-implantation is done in cases of endodontic failures where conventional treatment options either fail or cannot be carried out due to any reason. It involves extraction of the offending tooth, extra oral apicectomy, followed by reinsertion of the tooth into its anatomical location. The following case report presents a situation where an endodontic instrument was separated in the mesiobuccal root of the left mandibular second molar during instrumentation that could not be retrieved. The decision of intentional re-implantation was made after detailed discussion with the patient, weighing pros and cons of each available treatment option. Fortunately, a favourable outcome was observed over a span of one year and the patient is still on follow-up for evaluation of long-term prognosis. Key Words: Intentional re-implantation, Apicectomy, Broken file.
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Matelski, Jennifer, Aaron Rendahl, and Stephanie Goldschmidt. "Effect of Alternative Palatal Root Access Technique on Fracture Resistance of Root Canal Treated Maxillary Fourth Premolar Teeth in Dogs." Frontiers in Veterinary Science 7 (December 11, 2020). http://dx.doi.org/10.3389/fvets.2020.600145.
Full textAbstract:
A biomechanical study was performed to identify the effect of different treatment methods for difficult to instrument palatal roots on the fracture resistance of root canal treated maxillary fourth premolar teeth in dogs. Forty maxillary fourth premolar teeth with surrounding alveolar bone were harvested from beagle cadavers. Inclusion criteria included maxillary fourth premolars with no evidence of disease and similar distal root canal volumes on radiographic evaluation. The teeth were randomly divided into a control group and three treatment groups based on the endodontic treatment technique for the palatal root. The control group had a single 2 mm transcoronal access on the mesiobuccal aspect of the tooth to allow instrumentation of both the mesiobuccal and palatal root through a single small access. Alternative treatment modalities that are described for difficult to instrument palatal roots investigated in this study included enlarging the transcoronal mesiobuccal access to 4 mm, making an additional access directly over the palatal root (2 mm), and hemisection with extraction of the palatal root. All teeth had the same distal root access size (2 mm) and relative location. After access, all teeth were filed, shaped, obturated, and restored in the same fashion. Axial compression testing was performed at an angle of 60 degrees to the long axis of the tooth using a universal materials testing machine. The maximum force prior to fracture was determined for each tooth based on a force vs. deflection curve. The mean maximum force prior to fracture for all teeth was 831 N. No significant difference in mean fracture resistance was identified between the control group and treatment groups or between the different treatment groups themselves. Thus, when faced with a difficult to instrument palatal root, the treatment method chosen should be based on operator preference and experience.
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Bernal, Christian Giancarlo, Ester Mi Ryoung Lee, Carlos De Paula Eduardo, Ana Maria Aparecida Souza, and Luciane Hiramatsu Azevedo. "Retreatment of 6 Ceramic Restorations In A Single Session - The Application of Er:YAG Laser And CAD/CAM Technology: An 1 Year Follow Up Clinical Evaluation." Brazilian Dental Science 24, no. 2 (2021). http://dx.doi.org/10.14295/bds.2021.v24i2.2234.
Full textAbstract:
Background: To present the benefits of high power lasers (Er: YAG and Nd: YAG) over the use of the high speed turbine for the extraction of ceramics restorations, without damaging the surfaces of the teeth; being a relatively easier and faster procedure without the use of anesthetic agents, and the preparation of the ceramic restorations and cementing in the single session; with a follow-up of 1 year. Objective: The benefits of lasers over high-speed turbine mechanical instrumentation for crown removal encompass efficient restoration recovery without damage to tooth surfaces; and a relatively easier and faster procedure without the use of anesthetic agents. Methods: The Er: YAG laser (no contact; 3.2-4.0 W, 20 Hz) was used to extract the porcelain prosthesis, followed by a gingivectomy with the Nd: YAG laser on tooth 12 to improve the gingival contour. The dental surfaces where the ceramic prosthesis will be cemented were scanned. Then, CAD / CAM technology was used to make the ceramic veneers that were cemented in the same session. Results: The efficacy the Er:YAG laser energy was observed by the decreased of the time to remove all-ceramic materials through ablation of bonding cements, reducing working time by 75% compared to a high-speed turbine. Conclusions: An Er: YAG laser can safely remove lithium disilicate crowns with the settings used in this study. Laser-assisted removal of all ceramic PDFs is a promising treatment protocol. The use of the Nd: YAG (2.0 W power, short 20Hz, 320 µm optical fiber, in contact) laser allowed gingivoplasty to be performed, automatically cauterizing avoiding post-operative bleeding, and facilitating the preparation of ceramic restorations the same day. The use of high-power lasers and the use of accompanying CAD / CAM technology allowed this clinical case to be completed in a single visit without the use of temporary restorations, achieving absolute patient satisfaction. Keywords Er:YAG; Nd:YAG; Lithium disilicate ceramic; CAD/CAM.