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1
Gogushev, Kiril, and Metodi Abadjiev. "CONVENTIONAL VS DIGITAL IMPRESSION TECHNIQUE FOR MANUFACTURING OF THREE-UNIT ZIRCONIA BRIDGES: CLINICAL TIME EFFICIENCY." Journal of IMAB - Annual Proceeding (Scientific Papers) 27, no. 2 (June 4, 2021): 3765–71. http://dx.doi.org/10.5272/jimab.2021272.3765.
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Introduction: Taking an impression of the oral cavity, which accurately recreates the prosthetic field, the surrounding hard dental and soft tissues, is one of the main and most important stages in the process of making any fixed prosthetic restoration. In modern prosthetic dentistry, impressions taken with the help of polyether and vinyl polysiloxane impression materials are common. Digital impressions eliminate some of the steps of conventional impression techniques and save clinical time. Aim: The aim of this article is to compare the clinical time in digital and conventional impression techniques from a whole dental arch using a controlled clinical trial. Material and methods: The present study includes 36 patients from Varna who need prosthetic treatment with fixed 3-unit bridge construction. For all participants, the conventional impression technique was performed first and one week later - the digital one. All clinical manipulations related to the implementation of the two impression techniques were performed according to the instructions of the manufacturing companies by the same specialist dentist. Results: In all participants, the time required to perform the digital impression technique is significantly less than that of the conventional impression technique. Conclusion: The digital impression technique has proven to be more efficient in terms of clinical time required for its implementation than the conventional impression technique.
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Mangano, Alessandro, Matteo Beretta, Giuseppe Luongo, Carlo Mangano, and Francesco Mangano. "Conventional Vs Digital Impressions: Acceptability, Treatment Comfort and Stress Among Young Orthodontic Patients." Open Dentistry Journal 12, no. 1 (January 31, 2018): 118–24. http://dx.doi.org/10.2174/1874210601812010118.
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Objective: The objective of the present study was to compare patients’ acceptability, comfort and stress with conventional and digital impressions. Materials and Methods: Thirty young orthodontic patients (15 males and 15 females) who had no previous experience of impressions were enrolled in this study. Conventional impressions for orthodontic study models of the dental arches were taken using an alginate impression material (Hydrogum®, Zhermack Spa, Badia Polesine, Rovigo, Italy). Fifteen days later, digital impressions of both arches were acquired using an intraoral scanner (CS3600®, Carestream Dental, Rochester, NY, USA). Immediately after impression taking, patients’ acceptability, comfort and stress were measured using two questionnaires and the State anxiety scale. Results: Data showed no difference in terms of anxiety and stress; however, patients preferred the use of digital impressions systems instead of conventional impression techniques. Alginate impressions resulted as fast as digital impressions. Conclusions: Digital impressions resulted the most accepted and comfortable impression technique in young orthodontic patients, when compared to conventional techniques.
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Alfallaj, Hayam A., Mohammed A. Alsaloum, Sahr H. Altuwaijri, Omar S. Aldibasi, and Lubna T. Alkadi. "Procedure Time and Students’ Perception Comparing Full Arch Digital Scans with Conventional Impressions: A Cross-Over Randomized Experimental Trial." International Journal of Dentistry 2022 (October 17, 2022): 1–7. http://dx.doi.org/10.1155/2022/6320251.
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Purpose/Objectives. Dental students are being introduced to intraoral digital scanning during their undergraduate dental education. Usually, the conventional impression technique is introduced before the digital scanning technique. This study compares the procedure duration, students’ preference, and perceived procedure difficulty level after students’ initial preclinical exposure to either digital scanning using CEREC Omnicam intraoral scanners or conventional impressions using vinyl polysiloxane impression material. Methods. Ninety-six dental students each prepared tooth #36 for an all-ceramic crown on typodont models and were then randomly assigned into either group A: performed digital scan first, or Group B: performed conventional impression first. Procedure time was recorded for both. Immediately following each procedure, students indicated their perceived procedure difficulty. After exposure to both techniques, they selected their preferred one. Results. There was a statistically significant difference between the mean procedure time of both techniques ( P < 0.0001 ), where students spent 663.76 ± 442.50 seconds to complete the conventional impression and 293.32 ± 181.49 seconds to complete the digital scan. Females were significantly faster in completing the conventional impression compared to males. On the contrary, male students were faster in digital scanning than female students. There were no carryover effects in the duration and the initially performed procedure. 76% (73 of 96) of participants preferred digital scanning with no statistical significance shown between the preferred and initially performed procedure. Participants perceived conventional impressions to be more difficult than digital scans. There was a weak positive correlation between the VAS score and the procedure time for the digital technique (R = 0.25) and a moderate positive correlation for the conventional technique (R = 0.45). Conclusions. The digital technique was preferred and perceived as easier than the conventional among undergraduate dental students with no impression-making experience, suggesting their readiness for new technology uptake. However, no significant correlation was found between the initially performed procedure and preference.
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Sikri, Dr Arpit, and Dr Jyotsana Sikri. "Dental Implant Impressions: The First Impression Is The Last Impression: Short Communication." ENVIRO Dental Journal 3, no. 2 (December 31, 2021): 43–45. http://dx.doi.org/10.12944/edj.03.02.05.
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Dental implant is defined as a prosthetic device made of alloplastic material(s) implanted into the oral tissues beneath the mucosal and/or periosteal layer and on or within the bone to provide retention and support for a fixed or removable dental prosthesis; a substance that is placed into and/or on the jaw bone to support a fixed or removable dental prosthesis [Glossary of Prosthodontic Terms (GPT 9)]. Dental implants have been swiftly gaining popularity as a treatment modality of choice in prosthodontics i.e. both fixed and removable. Impression is defined as negative likeness or copy in reverse of the surface of an object; an imprint of the teeth and adjacent structures for use in dentistry (GPT 9). Impressions in implantology is a crucial step and involves a meticulous workflow in achieving the passive fit for the long-term success of the final implant prosthesis. This involves accurately relating and recording the exact replica of the implant analogue or the implant abutment to the other structures in the oral cavity. A plethora of factors determine the accuracy of the implant impressions namely the choice of impression tray, impression material, number of implants, depth, position and angulation of implants and most importantly the technique encountered for recording the impression. This short communication briefly portrays the armamentarium and components used along with the selection of a suitable impression tray, impression material and impression technique devised for the precise impression of the implant for the ultimate success of the final prosthesis.
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Craig, R. G. "Review of Dental Impression Materials." Advances in Dental Research 2, no. 1 (August 1988): 51–64. http://dx.doi.org/10.1177/08959374880020012001.
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Major advances in impression materials and their application have occurred during the last decade, with greater emphasis being placed on rubber impression materials than on dental compound, zinc oxide-eugenol, and agar and alginate. Of particular interest has been the effect of disinfection solutions on the qualities of impressions and the biocompatibility of impression materials. The principal advance in hydrocolloids has been the introduction of the agar/alginate impression technique, which has simplified the procedure and improved the quality of gypsum dies compared with those prepared in alginate impressions. The tear strength of some alginates has been improved, and some have been formulated so that the powder is dustless, thus reducing the health hazard as a result of patient inhalation of dust during the dispensing process. Polyether and silicone impression materials have been modified so that the working time, viscosity, and flexibility of the polyethers have been improved and, with the introduction of addition silicones, their accuracy has become exceptional. Although the early addition silicones liberated hydrogen after setting, thus delaying the pouring of models and dies, most addition silicones have been improved so that no hydrogen is released and dies can be poured immediately. The introduction of automatic mixing systems for addition silicones has simplified their manipulation, has reduced the number of voids in impressions, and has reduced the amount of material wasted. The incorporation of surfactants into addition silicones has made them hydrophilic, with wetting properties similar to those of polyethers, and has made pouring bubble-free gypsum dies easier. This review is confined to published and unpublished information of the past decade. It will also suggest trends that should be anticipated in the near future based on this information. The review will not present information developed before 1975, which is available in several textbooks on dental materials by Craig (1985a), Phillips (1982), and Williams and Cunningham (1979).
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Pandey, Anisha, S. R. B. Mathema, and S. K. Maharjan. "Comparison of Dimensional Accuracy of Cast Obtained from Polyvinyl Siloxane Impression with Different Putty-Wash Techniques and Spacer Thickness - In Vitro Study." Journal of Nepalese Prosthodontic Society 1, no. 2 (December 31, 2018): 67–74. http://dx.doi.org/10.3126/jnprossoc.v1i2.23859.
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Introduction: Dimensional accuracy of cast obtained after making impressions is crucial factor for the quality of fixed prosthodontic treatment. The impression technique with different thickness of putty wash material is critical factor affecting this accuracy. There is much discussion in the dental literature concerning the effect of this impression technique on the accuracy of cast restorations.
Materials and methods: This in-vitro study was carried out in 60 impression made from master model with Polyvinyl siloxane impressions material using single step putty- wash technique and two step putty-wash technique with varying spacer thickness (0.5mm, 1mm, 1.5 mm). It was further divided into four groups. Group I: Single step putty-wash impression technique, Group II: Two step putty-wash impression technique with 0.5mm spacer, Group III: Two step putty-wash impression technique with 1mm spacer, Group IV: Two step putty-wash impression technique with 1.5mm spacer. Each group consists of 15 impressions. Casts were poured using type IV dental stone after 1 hour. After 24 hour the die of each cast was scanned using CAD/CAM digital scanner and measured mesiodistally, facio-lingually, height (cervico-occlusally), interabutment or interdie distances. The data were recorded and statically analyzed.
Results: The highest mean values of mesio-distal, bucco-lingual, cervico-occlusal distances were shown by Group I, whereas the inter-die distance showed equal mean value in Group I, II and III. With the increase in the spacer thickness, the mean value also increases in mesio-distal distance. The mean measurement of bucco-lingual dimension was highest when spacer thickness was 0.5mm and it declined with the increase in spacer thickness. The spacer thickness had no effect on cervico-occlusal and inter-die dimensions.
Conclusions: Within the limitations of the study, accuracy of cast obtained from single step putty-wash technique was more accurate than two step putty-wash technique. In two step putty-wash technique, 1.5 mm thickness of spacer showed more accurate cast in comparison to 0.5mm and 1mm.
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Patel, Jilen, John Winters, and Mark Walters. "Intraoral Digital Impression Technique for a Neonate With Bilateral Cleft Lip and Palate." Cleft Palate-Craniofacial Journal 56, no. 8 (March 11, 2019): 1120–23. http://dx.doi.org/10.1177/1055665619835082.
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Objective: Dental casts are an important aspect in the treatment planning, documentation, and analysis of the dental arch forms of infants with cleft lip and palate (CLP). Impression taking in a neonate is a technique-sensitive procedure, which can result in foreign body dislodgement and carries a small risk of aspiration and airway obstruction. The advent of digital dental technologies and intraoral scanning may facilitate safer, more effective, and accurate impressions for CLP infants. Design: A digital intraoral scan of a 3-month-old with bilateral CLP (BCLP) was compared with a conventional alginate impression taken prior to primary lip repair. Setting: Princess Margaret Hospital for Children. Main Outcome Measures: To test the applicability and accuracy of digital impression taking for a neonate with BCLP and palate using digital morphometrics. Results: The average deviation of points ranged above and below the plane of superimposition from +0.78 mm to −0.42 mm with a maximum range of +2.80 mm to −2.80 mm and standard deviation of 0.88 mm. The premaxillary segment showed the greatest degree of variation. Conclusions: This is to our knowledge the first report that illustrates the use of a digital impression system to scan the oral structures of a neonate with BCLP. Digital scanning was found to be fast, accurate, and safe, when compared to a conventional alginate impression technique.
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Naumovski, Borjan, and Biljana Kapushevska. "Dimensional Stability and Accuracy of Silicone – Based Impression Materials Using Different Impression Techniques – A Literature Review." PRILOZI 38, no. 2 (September 1, 2017): 131–38. http://dx.doi.org/10.1515/prilozi-2017-0031.
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Abstract A quality-made dental impression is a prerequisite for successful fixed-prosthodontic fabrication and is directly dependent on the dimensional stability, accuracy and flexibility of the elastomeric impression materials, as well as on the appropriately used impression techniques. The purpose of this paper is to provide a literature review of relevant scientific papers which discuss the use of various silicone impression materials, different impression techniques and to evaluate their impact on the dimensional stability and accuracy of the obtained impressions. Scientific papers and studies were selected according to the materials used, the sample size, impression technique, storage time, type of measurements and use of spacer for the period between 2002 and 2016. In the reviewed literature several factors that influence the dimensional stability and accuracy of silicone impression molds, including the choice of the type of viscosity, impression material thickness, impression technique, retention of the impression material on the tray, storage time before the casting, number of castings, hydrophilicity of the material, release of byproducts, contraction after polymerization, thermal contraction and incomplete elastic recovery were presented. The literature review confirmed the lack of standardization of methodologies applied in the research and their great diversity. All findings point to the superiority of the addition silicone compared to the condensation silicone.
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Özcan, Işıl, Aslıhan Köroğlu, Ediz Kale, Tuncer Özçelik, and Burak Yilmaz. "Clinical evaluation of one-step impression technique and definitive casts." Balkan Journal of Dental Medicine 26, no. 2 (2022): 82–87. http://dx.doi.org/10.5937/bjdm2202082q.
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Background/Aim: The purpose of this study was to evaluate the quality of impressions made with vinyl polysiloxane (VPS) material in clinical conditions by using the one-step impression technique, and the quality of casts generated from these impressions. The effect of operator, number and location of abutments, and presence of bleeding were also investigated. Material and Methods: A total of 150 fixed dental prosthesis (FDP) impressions were taken and considered acceptable by 3 experienced prosthodontists in a clinic in an institutional setting. The impressions were evaluated and rated by another experienced prosthodontist and respective casts were evaluated and rated by an experienced dental technician using a digital microscope with ×200 magnification. The defects observed were noted as bubbles, voids, tears, or other defects. A scale was structured for the impressions and casts with ratings of Alpha (excellent; no defects), Bravo (acceptable; small defects), Charlie (inadequate; defects that require remaking of impression), and Delta (unacceptable; substantial defects at preparation finish lines). The data were analyzed with the Chi-square test for inter-operator, number of abutments, and location of prepared tooth variables (a=0.05). Results: The scale ratings were 85 Alpha (57%), 52 Bravo (34%), 6 Charlie (4%), and 7 Delta (5%) for the impressions, and 81 Alpha (54%), 58 Bravo (39%), 4 Charlie (3%), and 7 Delta (5%) for the respective casts. Sixty-nine percent of the impressions and respective casts were rated with the same score. The scale rating results were not influenced by inter-operator variability or number of abutments. Location of the prepared tooth was significant for anterior/posterior (p=0.04), but was not significant for maxilla/ mandible (p>0.05). Bleeding at the preparation site had a significant effect on the acceptability of the impression (p=0.003). Conclusions: The acceptability of VPS impressions using onestep technique was independent of the operator, number of abutments, or whether the prepared tooth was in maxilla or mandible. Impressions of teeth in the anterior region were more acceptable than those located in the posterior. Bleeding negatively affected the acceptability of the impressions. Clinicians may use VPS impressions for the fabrication of FDPs using onestep dual-phase technique. However, clinicians should carefully evaluate their impressions when bleeding is present when using this technique.
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Dibyatanu Majumder, Sarmishtha Saha, and Parama Sengupta. "A survey of impression materials and techniques in fixed partial dentures among general dental practitioners and prosthodontists in India." Asian Journal of Medical Sciences 13, no. 9 (September 1, 2022): 244–51. http://dx.doi.org/10.3126/ajms.v13i9.44422.
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Background: Replacement of missing tooth plays an important role in patient’s comfort and self-esteem. Aims and Objectives: The aims of this study were to investigate the most commonly used impression materials and techniques practiced for crowns and bridgework by prosthodontists and general dental practitioners compared to the theoretical methods suggested in the literature and to determine the clinical factors that might influence the decision-making process for the selection of impression materials and techniques. Materials and Methods: Pre-tested and pre-validated structured and closed-ended anonymous questionnaire was shared with general dental practitioners and prosthodontists. Results: Most of the prosthodontists use diagnostic impression compared to general dental practitioners (P<0.01). Full-arch tray was used by general dental practitioners significantly more frequently compared to prosthodontists (P<0.01) for single anterior, single posterior, anterior, and posterior bridge preparations. Alginate hydrocolloid was used by general dental practitioners significantly more than prosthodontists (P<0.05); however, addition silicone and condensation silicone were used by prosthodontists significantly more than general dental practitioners (P<0.05). For the impression technique followed in case of using elastomeric impression materials, the prosthodontists used the two-step putty reline technique with spacer more commonly, while general dental practitioners used the multiple mix technique (P<0.01). For the use of provisional restoration for single tooth crowns and for all the bridges, prosthodontists used provisional restoration in significantly higher proportion as compared to general dental practitioners (P<0.01). Conclusion: According to our study compared to general dental practitioners, practices of the prosthodontists regarding use of fixed partial denture is more in line with the current global trend.
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Potran, Michal, Branko Strbac, Tatjana Puskar, Miodrag Hadzistevic, Janko Hodolic, and Branka Trifkovic. "Measurement of the accuracy of dental working casts using a coordinate measuring machine." Vojnosanitetski pregled 73, no. 10 (2016): 895–903. http://dx.doi.org/10.2298/vsp150105089p.
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Background/Aim: Dental impressions present a negative imprint of intraoral tissues of a patient which is, by pouring in gypsum, transferred extraorally on the working cast. Casting an accurate and precise working cast presents the first and very important step, since each of the following stages contributes to the overall error of the production process, which can lead to inadequately fitting dental restorations. The aim of this study was to promote and test a new model and technique for in vitro evaluation of the dental impression accuracy, as well as to asses the dimensional stability of impression material depending on the material bulk, and its effect on the accuracy of working casts. Methods. Impressions were made by the monophasic technique using the experimental master model. Custom trays with spacing of 1, 2 and 3 mm were constructed by rapid prototyping. The overall of 10 impressions were made with each custom tray. Working casts were made with gypsum type IV. Measurement of working casts was done 24 h later using a co-ordinate measuring machine. Results. The obtained results show that the working casts of all the three custom trays were in most cases significantly different in the transversal and sagittal planes in relation to the master model. The height of abutments was mainly unaffected. The degree of convergence showed certain significance in all the three custom trays, most pronounced in the tray with 3 mm spacing. Conclusion. The impression material bulk of 1?3 mm could provide accurate working casts when using the monophasic impression technique. The increase of the distance between abutment teeth influences the accuracy of working casts depending on the material bulk.
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Maskey, Brijesh, S. R. B. Mathema, and A. Bhochhibhoya. "A Simplified Impression Technique for a Flabby Maxilla - A Clinical Report." Journal of Nepalese Prosthodontic Society 1, no. 2 (December 31, 2018): 96–99. http://dx.doi.org/10.3126/jnprossoc.v1i2.23864.
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Flabby maxillary ridge is the most commonly encountered clinical condition during routine dental practice. The presence of these displaceable denture-bearing tissues often poses difficulty during fabrication of complete dentures resulting in compromised support, retention and stability. Many impression techniques and materials have been proposed in various literatures to help overcome this difficulty. These techniques vary in philosophies but are often quite time-consuming to perform, and rely on materials not commonly in use in contemporary dental practice. The purpose of this paper is to describe an impression technique for flabby ridges, using conventional impression material.
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Hussien, Hussameldien, and Natashekara Mallesh. "A Comparative study of Different Impression Materials and Techniques of Dental Implant at The Second Stage of Procedure." International Journal of Dentistry Research 4, no. 2 (August 24, 2019): 90–93. http://dx.doi.org/10.31254/dentistry.2019.4210.
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Background of the study: Dental implants are one of the most sought-after choice of treatment for restoration and rehabilitation of missing teeth. However, the accuracy of the removable or fixed superstructures over the dental implants is influenced for a major proportion by the impression techniques and materials. This paper discusses the comparison of the accuracy of different impression materials and techniques used in the second stage of the dental implant treatment in vivo. Objective: The objective of the paper is to study the comparison of the accuracy of different impression materials and techniques used in the second stage of the dental implant’s treatment in vivo. Search methodology: Electronically key searched in scientific literature databases. Selection criteria: Based on the set inclusion and exclusion criteria such as studies conducted in partial edentulous arches, in the age group of 30 to 55 years. Data collection and analysis: A total of 248 literatures were found to be relevant to the framed topic and were scrutinised based on the dejected criteria and 18 kinds of literature obtained were taken into consideration. Main Result: Among the different impression materials taken into the comparative study, it was observed that polyvinyl siloxane exhibited a dimensional accuracy slightly greater than polyether. However, light body putty exhibited greater accuracy than medium body putty. Various impression techniques were compared to evaluate the dimensional accuracy of the impression. It was observed that the open tray technique and splinted impression technique produced a more dimensionally stable impression than the other techniques. Authors Conclusion: this study to assess the accuracy of various impression material and methods has concluded that while impression techniques influence the accuracy of the impression, the impression materials namely the Polyvinyl siloxane and polyether exhibit no significant difference with a slight preference to the polyvinyl siloxane. Hence the choice of impression material is at the discretion of the dentist performing the treatment and also this area requires further studies to establish conclusive evidence.
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Santucci, NM, ET Santucci, and M. Geissberger. "A Simplified Clinical Technique for a Routine Indirect Restoration Impression on a Challenging Patient Using a Dry Field Illuminator." Operative Dentistry 39, no. 1 (January 1, 2014): 15–21. http://dx.doi.org/10.2341/11-290-t.
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SUMMARY Detailed and accurate impressions are made when the oral environment is dry during the impression process.1 Maintaining a dry field on medically, physically, or emotionally compromised patients can be very challenging. If not achieved, it may compromise dental care and accurate outcomes. This article describes a technique that can be used to make a final impression for an indirect restoration in a protected, isolated, and dry environment, using a dry field illuminator.
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Rippe, Marília Pivetta, Elen Guerra, Arianne Vallim Pinto Coelho, Lilian Costa Anami, Renata Marques de Melo Marinho, Marco Antonio Bottino, and Luiz Felipe Valandro. "Effect of different impression methods and ceramic materials on adaptation of inlays." Brazilian Dental Science 21, no. 3 (August 1, 2018): 296. http://dx.doi.org/10.14295/bds.2018.v21i3.1543.
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<p><strong>Objective:</strong> The aim of this study was to evaluate the internal and marginal adaptation of inlays fabricated from different types of impressions (conventional and digital) and different ceramics (feldspathic and lithium disilicate). <strong>Material and Methods:</strong> Forty premolars were prepared for all-ceramic inlay restoration and assigned to 4 groups (n=10), according to the impression method (conventional with addition silicone and digital impressions) and ceramic type (lithium disilicate and feldspathic ceramic blocks). For each type of impression, 10 inlays were fabricated from lithium disilicate blocks and the other 10 from feldspathic ceramic blocks, by means of the CAD-CAM system. The internal adaptation was analyzed by replica. The marginal fit was analyzed under a stereomicroscope by directly measuring the gap formed between the inlay and the tooth in the proximal and occlusal regions. <strong>Results:</strong> The marginal or internal adaptations were not affected by type of impression (conventional = digital impression), irrespective of the ceramic type. Only the internal adaptation was affected by material, i.e., feldspathic ceramic had lower values than disilicate ceramic, when considering the digital impression. <strong>Conclusion:</strong> The conventional and digital impressions promote similar marginal and internal adaptation of tested feldspathic and disilicate ceramic inlays. For digital impression the feldspathic ceramic showed better internal adaptation than lithium disilicate. </p><p><strong>Keywords</strong></p><p>Ceramics; Dental internal adaptation; Dental marginal adaptation; Dental impression technique.</p>
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Suhendra, Dewi Farida Nurlitasari, and Dsk Pt Bunga Raditya Pradnyadena. "DIMENSIONAL ACCURACY OF DIGITAL IMPRESSION AND DOUBLE IMPRESSION MOLDING MODELS IN THE MANUFACTURING OF BRIDGE DENTAL." Interdental Jurnal Kedokteran Gigi (IJKG) 18, no. 1 (June 25, 2022): 47–55. http://dx.doi.org/10.46862/interdental.v18i1.4315.
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Dimensional accuracy of the impression model is very important in determining the success of denture treatment. The choice of printing technique is a factor that has a big influence on the printout. Digital impression and double impression techniques have good dimensional stability and provide accurate print details on the working model. The purpose of this study was to determine the level of dimensional accuracy of the digital impression and double impression models in the manufacture of bridge dentures. The research materials used were polyvinyl siloxanes elastomeric impression materials, stone gypsum type IV and aquades. The tools used are the master model, physiological printing spoon, glass stirrer, lekron, bowl spatula, calipers and 3D laser scanner. This research method used a laboratory experimental study design, and the master model was imprinted on the simulation of two abutments using digital impression and double impression techniques. The results showed that the digital impression technique showed a significant difference measured from the mesiodistal distance with the smallest value -0.004, the largest 0.011, the average difference 0.0369, at the occlusogingival distance the smallest value -0.003, the largest 0.009, the average difference 0.0375 , and the smallest value of interbutment distance is -0.001 and the largest is 0.000, and the average difference is -0.00031. The double impression technique showed a significant difference measured from the mesiodistal distance, the smallest value was -0.004, the largest was 0.011, the average difference was 0.00663, at the occlusogingival distance the smallest value was -0.014, the largest was 0.003, the average difference was 0.00300, and the interabutment distance was the smallest -0.001, the largest 0.003, and the average difference 0.00044. The conclusion of this study is that the digital impression technique is more accurate than the double impression technique in making denture bridges.
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Cicciù, Marco, Luca Fiorillo, Cesare D’Amico, Dario Gambino, Emanuele Mario Amantia, Luigi Laino, Salvatore Crimi, et al. "3D Digital Impression Systems Compared with Traditional Techniques in Dentistry: A Recent Data Systematic Review." Materials 13, no. 8 (April 23, 2020): 1982. http://dx.doi.org/10.3390/ma13081982.
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The advent of new technologies in the field of medicine and dentistry is giving improvements that lead the clinicians to have materials and procedures able to improve patients’ quality of life. In dentistry, the last digital techniques offer a fully digital computerized workflow that does not include the standard multiple traditional phases. The purpose of this study is to evaluate all clinical trials and clinical randomized trials related to the digital or dental impression technique in prosthetic dentistry trying to give the readers global information about advantages and disadvantages of each procedure. Data collection was conducted in the main scientific search engines, including articles from the last 10 years, in order to obtain results that do not concern obsolete impression techniques. Elsevier, Pubmed and Embase have been screened as sources for performing the research. The results data demonstrated how the working time appears to be improved with digital workflow, but without a significant result (P = 0.72596). The papers have been selected following the Population Intervention Comparison Outcome (PICO) question, which is related to the progress on dental impression materials and technique. The comparison between dentists or practitioners with respect to classic impression procedures, and students open to new device and digital techniques seem to be the key factor on the final impression technique choice. Surely, digital techniques will end up supplanting the analogical ones altogether, improving the quality of oral rehabilitations, the economics of dental practice and also the perception by our patients.
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Dalessandri, Domenico, Ingrid Tonni, Laura Laffranchi, Marco Migliorati, Gaetano Isola, Stefano Bonetti, Luca Visconti, and Corrado Paganelli. "Evaluation of a Digital Protocol for Pre-Surgical Orthopedic Treatment of Cleft Lip and Palate in Newborn Patients: A Pilot Study." Dentistry Journal 7, no. 4 (December 9, 2019): 111. http://dx.doi.org/10.3390/dj7040111.
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The aim of this study was to evaluate the accuracy, invasiveness and impact on clinical results of a digital oral impression protocol in the pre-surgical orthopedic treatment (PSOT) of newborn cleft lip and palate (CLP) patients undergoing primary alveolar surgical repair. Six patients were divided, according to impression technique used, into a digital (intraoral scanner (IOS)) and a non-digital (tray and putty (T&P)) group. Parents considered IOS impressions to be less invasive, compared to T&P impressions. The clinician that took all the impressions considered the IOS to be less stressful compared to the T&P method. In two T&P patients, the impression was repeated because some important anatomical details were missing, in one case due to patient regurgitation during the first attempt. No impression was repeated, and any adverse event was reported in the IOS group. There were no significant differences between these two protocols in pre-surgical alveolar gap reduction and surgical challenge. The study results indicate that this digital protocol can accelerate the production process of the passive molding plate with an instantaneous transmission of the digital impression to the dental lab, maintaining the same accuracy level and clinical outcomes of classical techniques and reducing the invasiveness of impression taking, avoiding any risk of impression material ingestion or inhalation.
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Moldi, Arvind, Vimal Gala, Shivakumar Puranik, Smita Karan, Sumit Deshpande, and Neelima Neela. "Survey of Impression Materials and Techniques in Fixed Partial Dentures among the Practitioners in India." ISRN Dentistry 2013 (April 22, 2013): 1–5. http://dx.doi.org/10.1155/2013/430214.
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Objective. Anecdotal evidence suggests that impression materials and techniques used in general dental practice for fixed partial dentures vary from those taught in dental schools. The aim of this survey was to integrate impression techniques evolved all over the years for fixed partial dentures and to know the techniques and materials which are used in the present day by the practitioners. Materials and Methods. A total of 1000 questionnaires were sent to various practitioners in India, out of which 807 questionnaires were filled. Results. The results showed that 84.8% of prosthodontists (65.56%, urban areas) use elastomeric impression materials as well as irreversible hydrocolloids and 15.2% use irreversible hydrocolloid only. Amongst other practitioners, 55.46% use irreversible hydrocolloid (45%, rural and semiurban areas) and 44.54% use elastomeric impression materials. Elastomeric impression technique practiced most commonly is putty reline with/without spacer (77.2%); other techniques are multiple-mix and monophase techniques. Conclusion. The ideal materials, technique, and armamentarium are required for the long-term success of the treatment for fixed partial denture. Also, if the ideal procedure is not followed, it will lead to a compromised fit of the final prosthesis and failure of the treatment.
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O'Leary, Ronan B., and Anne L. Gunderman. "A combined digital-conventional workflow to fabricate a removable partial denture for a patient with a severe gag reflex." Dental Update 47, no. 9 (October 2, 2020): 719–27. http://dx.doi.org/10.12968/denu.2020.47.9.719.
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Introducing a novel approach to overcoming a profound gag reflex and aversion to conventional dental impression procedures when fabricating a removable partial denture. The digital workflow is becoming increasingly popular in the discipline of fixed prosthodontics. Chairside digitization of a patient's dentition is a less invasive and more comfortable procedure in comparison to conventional dental impression techniques. The advantages can be most relevant to patients with a profound gag-reflex. Currently, certain challenges exist with full digitization in the discipline of removable prosthodontics. Combining digital and conventional workflows may serve as an alternative technique to construct removable prostheses for groups who cannot tolerate conventional methods. CPD/Clinical Relevance: Many patient groups may not tolerate conventional dental impression techniques. This method offers a combination of existing techniques as a suitable alternative for this cohort.
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Ahmed Hilal Sheriff K, Nivedhitha M S, and Rakshagan V. "Different Types of Finish Lines, Gingival Retraction Methods and Impression Techniques Used During Single Crown Preparation." International Journal of Research in Pharmaceutical Sciences 11, SPL3 (October 9, 2020): 1192–201. http://dx.doi.org/10.26452/ijrps.v11ispl3.3363.
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Tooth preparation is part of the daily routine for dentists. Each step involved in the tooth preparation is important. This study focuses on three parameters, finish lines, retraction methods and impression technique. retraction and impression technique go hand in hand, as retraction of the is mandatory to expose the prepared finish line and record them accurately. This study aimed to determine various types of finish lines, retraction methods and impression techniques incorporated during single crown preparation in Saveetha Dental College and Hospitals. Case records were collected from DIAS (Dental Information Archiving Software). This university setting study involved a sample size of 812 patients. Data was tabulated with parameters of name, age, sex, finish line, retraction, no. of cords, type of impression. The retraction method used was a mechanical retraction method which comprised 794 teeth and 554 of the retraction was done using "2 cords (000+1)". 2 stage putty wash technique was commonly employed during impression taking in tooth preparation of 746 teeth. Chi-square test done for association between tooth and finish lines, retraction methods, no. of cords used and impression technique did not show any statistical significance (p>0.05) while association of finish line with no. of cords and type of impression showed statistical significance (p<0.05). Within the limit of the study, the most widely used finish line was shoulder finish line and mechanical retraction methods were commonly employed with 2 stage putty wash technique being the most common impression technique.
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Anusavice, K. J. "Dental Impression Materials: Reactor Response." Advances in Dental Research 2, no. 1 (August 1988): 65–70. http://dx.doi.org/10.1177/08959374880020012101.
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A review of the literature reveals an abundance of research papers which are focused on the physical properties and "simulated" clinical performance of impression materials. The three major developments during the past two decades were: (1) the introduction of the dimensionally stable addition silicones, (2) the development of dustless alginates, and (3) the reduction in technique sensitivity which resulted from the availability of automatic-mixing syringe tips. These syringe tips ensure consistently homogeneous mixtures of base and catalyst pastes with reduced waste. In addition, the more rapid mixing potential extends the traditional working time of the material. Little progress has been made toward correlating in vitro properties with in vivo performance. Since typical in vitro studies of impression materials are conducted under nearly ideal conditions, the information derived is of relatively limited value in predicting their clinical performance under more demanding conditions. Future research should focus more on clinically relevant properties, including freedom from porosity, viscosity-time relationships, tissue displacement potential, tear strength, elastic recovery, sensitivity to storage conditions, compatibility with die stones, degradation potential after exposure to disinfectant and sterilizing solutions, and ability to be re-poured accurately.
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Naumovski, Borjan, Jadranka Bundevska, and Biljana Kapusevska. "Comparison of double-phase impression technique in 1 step and 2 steps by evaluating dimensional stability and accuracy of condensation silicones." Macedonian Pharmaceutical Bulletin 63, no. 01 (2018): 55–61. http://dx.doi.org/10.33320/maced.pharm.bull.2017.63.01.006.
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The diverse viscosities of silicone impression materials are suited for their use in various impression techniques, intended to improve the precision of the cast impression in the form of a plaster model. The purpose of this research is to determine the dimensional stability and accuracy of the double-phase impression technique in 1 step and 2 steps by using a condensation silicone impression material. This research was carried out by using a precise stainless-steel master model and an individual aluminum tray. Comparing the abutments of the master model and the abutments of the double-phase impression technique in 2 steps, showed that they are wider on average 81 µm, while the abutments from the double-phase impression technique in 1 step are on average 281 µm wider in diameter. After analyzing the results obtained in relation to the diameter of the abutments, it can be concluded that the double-phase impression technique in 2 steps is dimensionally more stable and accurate compared to the double-phase impression technique in 1 step. This study shows that dimensional stability and accuracy of impression materials also depend on the selection of appropriate impression technique and proper performance in order to obtain a high quality dental impression that will be the basis for an accurate fixed-prosthodontic fabrication. Keywords: silicone impression material, impression technique, fixed partial dentures, dimensional stability and accuracy
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Abdelaziz, Khalid M., Ahmed M. Hassan, and J. S. Hodges. "Reproducibility of sterilized rubber impressions." Brazilian Dental Journal 15, no. 3 (December 2004): 209–13. http://dx.doi.org/10.1590/s0103-64402004000300009.
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Impressions, dentures and other dental appliances may be contaminated with oral micro-flora or other organisms of varying pathogenicity from patient's saliva and blood. Several approaches have been tried to control the transmission of infectious organisms via dental impressions and because disinfection is less effective and has several drawbacks for impression characterization, several sterilization methods have been suggested. This study evaluated the reproducibility of rubber impressions after sterilization by different methods. Dimensional accuracy and wettability of two rubber impression materials (vinyl polysiloxane and polyether) were evaluated after sterilization by each of three well-known methods (immersion in 2% glutaraldehyde for 10 h, autoclaving and microwave radiation). Non-sterilized impressions served as control. The effect of the tray material on impression accuracy and the effect of topical surfactant on the wettability were also evaluated. One-way ANOVA with Dunnett's method was used for statistical analysis. All sterilizing methods reduced the reproducibility of rubber impressions, although not always significantly. Microwave sterilization had a small effect on both accuracy and wettability. The greater effects of the other methods could usually be overcome by using ceramic trays and by spraying impression surfaces with surfactant before pouring the gypsum mix. There was one exception: glutaraldehyde still degraded dimensional accuracy even with ceramic trays and surfactant. We conclude that a) sterilization of rubber impressions made on acrylic trays was usually associated with a degree of dimensional change; b) microwave energy seems to be a suitable technique for sterilizing rubber impressions; c) topical surfactant application helped restore wettability of sterilized impressions.
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Silva, Sávio Marcelo Leite Moreira da, and Milton Carlos Gonçalves Salvador. "Effect of the disinfection technique on the linear dimensional stability of dental impression materials." Journal of Applied Oral Science 12, no. 3 (September 2004): 244–49. http://dx.doi.org/10.1590/s1678-77572004000300016.
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The purpose of this study was to evaluate the dimensional stability of heavy and light bodied condensation silicones after immersion in disinfectant solution for 10 or 20 minutes. The impression materials were Optosil Comfort and Xantopren VL Plus and the disinfectant solutions were 1% sodium hypochlorite and 2% glutaraldehyde. Impressions were made on a perforated stainless steel tray, according to the American Dental Association specification No. 19, adding up to a total of 50 samples. The double mixing method (one time, two viscosities) was used. Impressions were removed from the roulette block after 7 minutes to ensure complete curing and then immersed in the solutions. Impressions not submitted to treatment composed the control group. After these steps, the impressions were removed from the solution, rinsed in running water and air-dried. Three-dimensional measurements were calculated using an optic microscope graduated at 0.001 mm. The two-way ANOVA indicated no differences (p>0.05) for any combination between variables. The results showed that the solution studied can be safely used to disinfect condensation silicone in clinical prosthodontic procedures.
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Ismail, Asma, Yosra Gassara, Dalenda Hadyaoui, and Mounir Cherif. "The Causes of Marginal Discrepancy of Fixed Dental Prostheses: A Cross-Sectional Study." Dentistry – Open Journal 6, no. 1 (January 8, 2020): 8–12. http://dx.doi.org/10.17140/doj-6-141.
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Objective Periodontal destruction observed in restored teeth is strongly caused by marginal discrepancy of the restoration, which is closely influenced by the tooth preparation, the technique of retraction and impression. Materials and Methods A hundred practitioners were selected to constitute the study’s sample. A self-administered questionnaire survey was carried out. The questionnaire was filled in the practitioner's office, completed in the absence of the investigator. However, it has been completed for some clarifications by an interview. A digital form made through the Google Forms application provided free by the Google search engine. The questionnaire included two sections: The identification of the practitioner: this is general information about the practitioner. The conduct of prosthetic treatment. The causes of marginal discrepancy: This section concerns the major factors responsible for a good marginal fit. The collected data was introduced and processed by the microcomputer using the statistical software XLSTAT 2015 for Windows. A simple statistical analysis made it possible to calculate the percentage of the different variables, from their frequency. Results There is a significant correlation between marginal discrepancy and the respect of the finish line geometry (p=0.001). The technique of retraction which provided the best marginal fit was the use of expasyl paste (p=0.18). There was a significant association between marginal discrepancy and the material of impression, marginal adaptation is found in 76% for impressions made by alginate, 45% for impressions made by silicone, and 100% for impressions made by polysulphides (p=0.01). Conclusion Within limitations of this study, it can be concluded that the respect of guidelines of preparation especially the finish line and the good choice of the retraction technique and the material of impression are the major keys to have a good marginal fit.
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Raviv, Eli, Jan Hanna, Roy Raviv, and Mili Harel-Raviv. "A Clinical Report on the Use of Closed-Tray, Hex-Lock-Friction-Fit Implant Impression Copings." Journal of Oral Implantology 40, no. 4 (August 1, 2014): 449–53. http://dx.doi.org/10.1563/aaid-joi-d-11-00056.
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The precision of an impression determines the subsequent accuracy and fit of the final restoration. Therefore, the ultimate search is for the most accurate impression material and the most efficient and least time consuming technique. One of the major debates in implant dentistry has focused on the advantages of the pick-up versus the transfer impression technique. The pick-up technique is widely accepted as the more accurate. However, the conventional transfer technique is simpler and less time consuming. The Hex-Lock-Friction-Fit impression coping (AB Dental Devices) combines the advantages of the transfer impression technique and the pick-up impression technique. In this article we will review the relevant literature, discuss the advantages of this unique implant impression technique, and present some related clinical cases.
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Soliman, Mai, Alhanoof Aldegheishem, Norah Alsubaie, Razan Alshamrani, and Elzahraa Eldwakhly. "Dimensional Accuracy of Working Dies Fabricated by Different Impression Materials and Techniques: 3D Digital Assessment." Journal of Biomaterials and Tissue Engineering 11, no. 1 (January 1, 2021): 106–11. http://dx.doi.org/10.1166/jbt.2021.2552.
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Accuracy of dental impression plays a significant role in the success of definitive restorations. This study aimed to compare the dimensional accuracy of working dies fabricated using two different impression materials and techniques. Forty working dies fabricated from 40 impressions of preprepared mandibular first molar tooth replica stabilized in a jaw model to receive full coverage crown. Two different Polyvinyl siloxane (PVS) impression materials were used; Aquasil and Virtual. Two different impression techniques were used with each type of impression material; One-step and two-step. The working dies dimensional accuracy was measured in four dimensions and compared with that of the preprepared molar tooth replica using a digital caliper and 3D scanner. Based on a 3D scanner, there were a significant difference of dies fabricated by the two tested impression materials using the two-step impression technique in Mesiodistal-Gingival dimension (IIA and IIB) groups compared to the preprepared tooth replica with an average 0.370 μm (P < .005). A significant difference was observed of the dies fabricated by the two tested impression techniques using virtual impression. material in Mesiodistal Occlusal dimensions with an average 0.135 μm (P < .03), and in Mesiodistal-Gingival dimensions with an average 0.490 μm (P < .001) and Buccolingual-Gingival dimensions with an average 0.143 μm (P < .005) using Aquasil impression material compared to the preprepared molar tooth replica. Both impression materials (Aquasil and Virtual) and techniques (One-step and Two-step) used in this study produced working dies with clinically accepted dimensional accuracy.
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Cervino, Gabriele, Luca Fiorillo, Alan Herford, Luigi Laino, Giuseppe Troiano, Giulia Amoroso, Salvatore Crimi, et al. "Alginate Materials and Dental Impression Technique: A Current State of the Art and Application to Dental Practice." Marine Drugs 17, no. 1 (December 29, 2018): 18. http://dx.doi.org/10.3390/md17010018.
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Hydrocolloids were the first elastic materials to be used in the dental field. Elastic impression materials include reversible (agar-agar), irreversible (alginate) hydrocolloids and synthetic elastomers (polysulfides, polyethers, silicones). They reproduce an imprint faithfully, providing details of a high definition despite the presence of undercuts. With the removal of the impression, being particularly rich in water, the imprints can deform but later adapt to the original shape due to the elastic properties they possess. The advantages of using alginate include the low cost, a better tolerability on the part of the patient, the ease of manipulation, the short time needed for execution, the instrumentation and the very simple execution technique and possibility of detecting a detailed impression (even in the presence of undercuts) in a single step. A comprehensive review of the current literature was conducted according to the PRISMA guidelines by accessing the NCBI PubMed database. Authors conducted a search of articles in written in English published from 2008 to 2018. All the relevant studies were included in the search with respect to the characteristics and evolution of new marine derived materials. Much progress has been made in the search for new marine derived materials. Conventional impression materials are different, and especially with the advent of digital technology, they have been suffering from a decline in research attention over the last few years. However, this type of impression material, alginates (derived from marine algae), have the advantage of being among the most used in the dental medical field.
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Gogushev, K., and Z. Valcheva. "CLINICAL AND LABORATORY WORKFLOW WITH FIXED PARTIAL DENTURES – A SURVEY AMONG DENTISTS AND DENTAL TECHNICIANS." EurasianUnionScientists 2, no. 3(84) (April 15, 2021): 22–27. http://dx.doi.org/10.31618/esu.2413-9335.2021.2.84.1280.
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With the advancement of medicine and the development of new technologies, more and more manufacturing companies consult dental specialists about their opinion on certain techniques, materials and devices in order to improve and refine them. The purpose of this article is to compare and study the opinion of dentists and dental technicians on the treatment with fixed restorations of zirconium dioxide, made using a conventional and digital impression technique. Materials and methods: Using anonymous questionnaires of 20 questions, the opinion of 72 dentists and 53 dental technicians was documented regarding the clinical and laboratory wrokflow protocol and the final result in the treatment with fixed partial dentures made of zirconium dioxide. Results: The majority of dentists treat a distally limited defect with a small number of mising teeth with a fixed partial dentures (86.1%). The most commonly used are porcelain-fused to metal with a non-precious alloy framework (83% for dental technicians and 93.1% of dentists, respectively), followed by zirconium dioxide structures (39.60% for dental technicians and 37.50% for dentists, respectively). Conclusion: The main way in which dentists and dental technicians treat distally limited defects of the dentition is through fixed porcelain-fused to metal restorations. Most dental professionals use a two-stage two-layer impression technique with addition silicones and standard metal impression trays.
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Svanborg, Per, Henrik Skjerven, Pablo Carlsson, Alf Eliasson, Stig Karlsson, and Anders Örtorp. "Marginal and Internal Fit of Cobalt-Chromium Fixed Dental Prostheses Generated from Digital and Conventional Impressions." International Journal of Dentistry 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/534382.
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Objectives. Digital impressions are increasingly used and have the potential to avoid the problem of inaccurate impressions. Only a few studies to verify the accuracy of digital impressions have been performed. The purpose of this study was to compare the marginal and internal fit of 3-unit tooth supported fixed dental prostheses (FDPs) fabricated from digital and conventional impressions.Methods. Ten FDPs were produced from digital impressions using the iTero system and 10 FDPs were produced using vinyl polysiloxane (VPS) impression material. A triple-scan protocol and CAD software were used for measuring and calculating discrepancies of the FDPs at 3 standard areas: mean internal discrepancy, absolute marginal gap, and cervical area discrepancy. The Mann-Whitney U test was used for analyzing the results.Results. For conventional and digital impressions, respectively, FDPs had an absolute marginal gap of 147 μm and 142 μm, cervical area discrepancy of 69 μm and 44 μm, and mean internal discrepancy of 117 μm and 93 μm. The differences were statistically significant in the cervical and internal areas (P<0.001).Significance. The results indicated that the digital impression technique is more exact and can generate 3-unit FDPs with a significantly closer fit compared to the VPS technique.
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Salah A. Yousief, Khames T. Alzahrani, Suha M. Alhuwairini, Fai Y. Alharbi, Dalal A. Eissa, Sara M. Almojaddidi, Maha A. Almalki, et al. "The Effects of Chemical Disinfection on Dimensional Stability among Different Type of Impression Addition Silicon Materials." International Journal of Innovative Research in Medical Science 5, no. 12 (December 28, 2020): 645–49. http://dx.doi.org/10.23958/ijirms/vol05-i12/1029.
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Introduction: Saliva and blood contaminated impressions are often a source of cross contamination between the clinic and dental laboratory. Explicit communication and observance of an infection control protocol for handling of dental impressions must exist among the office staff as well as between office and dental laboratories. Though disinfection of impression is routinely followed, autoclaving elastomeric impression is an effective method of sterilization them. Objectives: The purpose of this study was to evaluate dimensional stability and detail reproduction of a new addition silicon impression material after disinfection. Methods: In this study, a total of twenty impressions for the master model using heat resistant plastic stock trays. The twenty impressions were divided into two groups according to disinfection technique: (Table 2) Group 1: (n=10) Control group, untreated impressions. (C.G) Group 2: (n=10) Impressions were chemically disinfected. (D.G). after all impressions treatment, they were poured with extra hard stone (type IV) to get stone casts. Dimensional accuracy and detail reproduction of the impression material were evaluated indirectly through the recovered improved stone casts from impressions of the master model using the travelling microscope. Results: Cross arch distance (A): Epoxy resin master model cross arch distance measurement (A) was (41.36 mm). 1.1 Measurements of the cross-arch distance of stone casts Control group (C.G): The mean and standard deviation values of distance (A) in stone models obtained from C.G. were 41.553 ± 0.170 mm. Disinfection group (D.G): The mean and standard deviation values of distance (A) in stone models obtained from D.G were 41.368 ± 0.083 mm. ANOVA test showed that there was a statistically difference shrinkage between the groups (P-value = 0.006). 1.2 Measurement of the dimensional changes in the cross-arch distance of the different groups. The mean and standard deviation values of cross arch distance changes in stone models of C.G. were 0.191 ± 0.170 mm. while dimensional changes in stone models obtained from D.G. were 0.006 ± 0.082 mm. Conclusion: The purpose of this study was to evaluate dimensional stability and detail reproduction of a new addition silicon impression material after disinfection. In this study an epoxy resin master model was duplicated from a modified dentate mandibular model. Within the limitations of this study, it could be concluded that Chemical disinfectant of polyvinyl siloxane impression material can be successfully used in making fixed partial dentures.
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Nuriyanto, Ainy F., Rostiny Rostiny, and Bambang Agustono. "Neutral Zone: Concept and Technique Application for Managing Severely Resorbed Mandibular Ridges – A Case Report." e-GiGi 10, no. 1 (February 5, 2022): 32. http://dx.doi.org/10.35790/eg.v10i1.36615.
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Abstract: Full dental prosthesis rehabilitation on flat mandibular ridge has been a difficult case for clinicians for a long time. A huge resorption of mandibular ridge results in inadequate retention, and tounge muscle pressure, as well as lip and cheek muscles, causing a decrease in denture’s stability and retention. Neutral zone is a potential area or position where lips and cheek on one side, and tounge on the other side have balance pressure. We reported a 60-year-old male patient with chief complaints of difficulty in mastication, and loose upper and lower dentures. He also complained of denture moving during swallowing and speaking. In case management, the aim was to acquire optimum stability of the denture and arrangement of the mandibular teeth in full dental prosthesis guided by using the neutral zone. Preliminary impression was done by using alginate, then, horizontal and vertical jaw relation was recorded by using bite rim. Suction method impression technique was used to acquire functional impression. Lower denture teeth arrangement adapted the result of neutral zone impression. Acrylic denture was being contoured to adjust the natural anatomy of the oral cavity. In conclusion, the patient got a new full denture with maximum retention and stability while speaking as well as masticating. This article discussed about making of full dental prosthesis with pressure point on neutral zone impression technique on flat mandibular ridge caused by huge resorption.Keywords: flat mandibular ridge; denture stability; neutral zone; impression technique
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Haralur, Satheesh B., Majed S. Toman, Abdullah A. Al-Shahrani, and Abdullah A. Al-Qarni. "Dimensional Accuracy of Multiple Pour Cast from Different Elastomer Impression Techniques." International Journal of Prosthodontics and Restorative Dentistry 6, no. 3 (2016): 51–56. http://dx.doi.org/10.5005/jp-journals-10019-1155.
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ABSTRACT Context The elastomeric impression material is the most widely used impression material in contemporary dental practice; their accuracy is critical for the outcome of indirect restorations. The accurate duplicate cast obtained from single impression reduces the professional clinical time, patient inconvenience, and extra material cost. Aim To compare the accuracy of the cast obtained from various impression methods utilizing elastomer impression materials. Materials and methods The stainless steel working cast model assembly consisting of two abutments and one pontic area was fabricated. Two sets of six each custom aluminum trays were fabricated, with 5 mm spacer and 2 mm space. The impression methods evaluated in the study were additional silicone putty reline (two step), heavy-light body (one step), monophase (one step), and polyether (one step). Type IV gypsum casts were poured at intervals of 1, 12, 24, and 48 hours. The resultant cast was measured with a traveling microscope for comparative dimensional accuracy. The data obtained were subjected to analysis of variance test at significance level <0.05. Results The die obtained from putty reline two-step impression techniques had the percentage of variation for the height -0.36 to -0.97% with 0.40 to 0.90% increase in diameter. One-step heavy-light body impression dies recorded the increased width by 0.50 to 0.80% and height reduced by - 0.73 to -1.21%. The resultant dies from additional silicone monophase impressions had a percentage of variation for width 1.20% and height by-1.34%. The similar value for width and height for polyether was -1.46% and -1.30% respectively. Conclusion Putty reline technique dies had better dimensional accuracy after repeated pour followed by dies from heavy-light body additional silicone impression. Key message The multiple pour cast from putty reline elastomeric impressions is clinically acceptable, while cast from polyether was smaller in dimension. How to cite this article Haralur SB, Toman MS, Al-Shahrani AA, Al-Qarni AA. Dimensional Accuracy of Multiple Pour Cast from Different Elastomer Impression Techniques. Int J Prosthodont Restor Dent 2016;6(3):51-56.
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Sabouhi, Mahmoud, Farshad Bajoghli, Mansour Dakhilalian, Ali Beygi, and Majid Abolhasani. "Effects of Impression Coping Design, Impression Technique, and Dental Undercuts on the Accuracy of Implant Impressions Assessed by 3-Dimensional Optical Scanning." Implant Dentistry 25, no. 2 (April 2016): 238–46. http://dx.doi.org/10.1097/id.0000000000000389.
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Fernandes, Donato S., Nayana S. Anasane, and Amit K. Jagtap. "Splinting Open Tray Impression Copings Using Long Shank Carbide Burs during Definitive Impression: A Dental Technique." Journal of Contemporary Dental Practice 23, no. 5 (August 4, 2022): 566–68. http://dx.doi.org/10.5005/jp-journals-10024-3318.
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Pendergrass, Paula B., Cornelia A. Reeves, and Meyer W. Belovicz. "A Technique for Vaginal Casting Utilizing Vinyl Polysiloxane Dental Impression Material." Gynecologic and Obstetric Investigation 32, no. 2 (1991): 121–22. http://dx.doi.org/10.1159/000293010.
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Neppelenbroek, Karin Hermana, Vinicius Carvalho Porto, Carolina Campos Sugio, Anna Clara Gurgel Gomes, and Amanda Aparecida Maia Neves Garcia. "Minimizing the risk of fracture of definitive casts for removable partial dentures: A dental technique." IP Annals of Prosthodontics and Restorative Dentistry 7, no. 4 (December 15, 2021): 240–41. http://dx.doi.org/10.18231/j.aprd.2021.047.
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A technique is described to facilitate impression making and safely obtain the definitive cast for removable partial dentures with long, retentive, or lone-standing abutment teeth. Firstly, the individualized stock tray receives a coating of melted wax. Next, the prepared teeth are impressed with irreversible hydrocolloid, and the set impression is removed from mouth. The mold is then poured conventionally and, after the gypsum has set, is immersed in hot water to soften the wax and allow removal of the tray. The impression material is carefully cut away with a scalpel blade to expose the cast. With these straightforward and easily made changes compared with the conventional technique, the risk of fracturing the definitive cast is minimized, especially when reproducing long retentive teeth. A dental technique is presented that uses wax to coat the impression tray to facilitate the passive displacement of the cast. This results in a straightforward and precise definitive cast for removable partial dentures.
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Ionaş, Mona, and Adela Dăncilă. "Occlusal Surface Achieved Using the Stamp Technique." Acta Medica Transilvanica 25, no. 3 (September 1, 2020): 65–68. http://dx.doi.org/10.2478/amtsb-2020-0054.
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AbstractDental occlusion can be restored through preparation, modelling, occlusal adjustment and finishing or by reproducing the final future tooth surface. The micro-brush stamp technique is a new technique used in direct restorations. The purpose of this paper is to present a fast way of restoring the occlusal surface of a tooth when a previous correct functional impression of the surface exists. We will approach, step by step, the occlusal dental tissue reconstruction using a dental flowable composite and a microbrush to get a stamp of the occlusal surface in order to achieve precise occlusal topography.
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Farah, Rafat I. "A Chair-side Technique to verify the Parallelism of Fixed Partial Denture Abutments." International Journal of Prosthodontics and Restorative Dentistry 6, no. 1 (2016): 21–23. http://dx.doi.org/10.5005/jp-journals-10019-1148.
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ABSTRACT This report describes a chair-side technique to verify the parallelism of fixed partial denture abutments; this technique facilitates assessment of extraoral preparation and the detection of undercuts prior to making a definitive impression. This technique utilizes casts fabricated from polyvinyl siloxane impression material and a class II laser module attached to a dental surveyor. How to cite this article Farah RI. A Chair-side Technique to verify the Parallelism of Fixed Partial Denture Abutments. Int J Prosthodont Restor Dent 2016;6(1):21-23.
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V. Geshoska, Katerina, and Jagoda Bajevska. "Effect of manufacturing protocol on the internal fit and marginal discrepancy of metal ceramic and full ceramic dental crowns." Macedonian Pharmaceutical Bulletin 63, no. 01 (2018): 69–74. http://dx.doi.org/10.33320/maced.pharm.bull.2017.63.01.008.
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The accuracy of internal fit and marginal precision plays important role of clinical quality and success of dental crowns. Complications caused by marginal discrepancies such as caries, gingivitis, hypersensitivity are highlighted in dental literature. Despite marginal fit, internal fit and precision have a significant role in the persistence of full ceramic and metal ceramic crowns. As the technology evolves, it’s questionable which impression and manufacturing method is giving most accurate dental crowns. Therefore, the main purpose of this study is to get some information and data about marginal and internal fitting of dental crowns made by conventional, two-phase impression technique with polyvinyl siloxanes, and using different manufacturing process. Keywords: internal fit, marginal discrepancy, metal ceramic, full ceramic crowns
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Proussaefs, Periklis. "A Novel Technique for Immediate Loading Single Root Form Implants With an Interim CAD/CAM Milled Screw-Retained Crown." Journal of Oral Implantology 42, no. 4 (August 1, 2016): 327–32. http://dx.doi.org/10.1563/aaid-joi-d-15-00087.
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A technique is described where an interim abutment and crown are fabricated in the laboratory by utilizing computer-aided design/computer-aided manufacturing (CAD/CAM) technology and placed the day of dental implant surgery. The design and contours of the interim crown are designed by the computer software to be identical to the contours of the tentatively designed definitive prosthesis. The interim crown satisfies esthetics immediately after dental implant surgery while allowing the tissue to heal and obtain contours similar to the contours of the definitive prosthesis. The interim crown can be either cement retained or screw retained. The presented technique describes fabrication of a screw-retentive interim crown. After osseointegration is confirmed, a definitive impression is made with a CAD/CAM impression coping. The definitive prosthesis is then fabricated.
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Pera, Francesco, Paolo Pesce, Francesco Bagnasco, Nicolò Pancini, Massimo Carossa, Lorenzo Baldelli, Marco Annunziata, Marco Migliorati, Domenico Baldi, and Maria Menini. "Comparison of Milled Full-Arch Implant-Supported Frameworks Realised with a Full Digital Workflow or from Conventional Impression: A Clinical Study." Materials 16, no. 2 (January 15, 2023): 833. http://dx.doi.org/10.3390/ma16020833.
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Background: The aim of the present study was to investigate the accuracy of a new digital impression system, comparing it to the plaster impression technique in the realization of full-arch implant-supported metal frameworks. Methods: We took 11 scans (8 of the upper maxilla and 3 of the lower jaw) on a sample of nine patients previously rehabilitated with fixed full-arch screw-retained prostheses following the Columbus Bridge Protocol (CBP) with four to six implants (total: 51) since at least 4 months. Two impressions were taken for each dental arch: one analogic plaster impression using pick-up copings and an open tray technique and a second one using an intra-oral scanner. Two milled metal substructures were realised. The precision and passivity of the substructures were clinically analysed through the Sheffield test and endo-oral radiographs. Laboratory scans of the plaster casts obtained from an intra-oral scanner (IOS) and of the plaster casts obtained from traditional impression were compared with the intraoral scans following Hausdorff’s method and an industrial digital method of optical detection to measure discrepancies. A Mann–Whitney test was performed in order to investigate average distances between surfaces after the superposition. Results: The Sheffield test demonstrated an excellent passivity of the frameworks obtained through both the digital and the analogic method. In 81.81% of cases (n = 9) both substructures were found to have a perfect fit with excellent passivity, while in 18.18% (n = 2) of cases the substructures were found to have a very slight discrepancy. From the radiographic examination, no gaps between the frameworks and the implant heads or multiunit abutments were observed, with 100% accuracy. By superimposing digital files of scans according to Hausdorff’s method, a statistically significant discrepancy (p = 0.006) was found between the digital scans and the digital models obtained from plaster impressions. Three-dimensional optical detection found a mean discrepancy of 0.11 mm between the analogic cast and the cast derived from the digital impression. Conclusions: The present study clinically demonstrates that milled implant-supported full-arch frameworks obtained through a digital scan and the herein described technique have an accuracy comparable to those obtained with traditional plaster impression.
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Lee, Chunui, Shavkat Dusmukhamedov, Yi-Qin Fang, Seung-Mi Jeong, and Byung-Ho Choi. "Accuracy of the Provisional Prosthesis Scanning Techniqueversus a Conventional Impression Technique on Completely Edentulous Arches." Applied Sciences 11, no. 16 (August 4, 2021): 7182. http://dx.doi.org/10.3390/app11167182.
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Purpose: In this study, we aimed to compare the marginal fit of fixed dental restorations fabricated with the provisional prosthesis scanning technique versus a conventional impression technique and to determine the effect of both variables on the accuracy outcome. Materials and Methods: Twelve identical polyurethane edentulous maxillary models were equally divided into two groups: control (conventional impression group) and test (provisional prosthesis scanning group). After obtaining the impression using the above-mentioned methods and further preparing the final prosthesis, the passivity of the metal framework prosthesis was checked using a single screw test, i.e., only one screw was fixed on the terminal right abutment, and all others were empty. The marginal fit of the final prosthetic frameworks screwed onto the implants on the terminal left abutment was measured at the terminal right sight by periapical radiographs obtained immediately after metal framework placements in both groups. The medians derived from the two groups were compared using the Mann–Whitney test. In all tests, a p-value < 0.05 indicated statistical significance. Results: In the provisional prosthesis scanning group, the median marginal fit discrepancy was 170 µm (range 120–190). In the conventional impression group, the median marginal fit discrepancy was 1080 µm (range 1040–1100). There was a significant difference in the implant-framework marginal gap fit discrepancy between these two groups. Conclusion: Prostheses fabricated with the provisional prosthesis scanning technique are significantly more accurate than those fabricated with conventional impression techniques.
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Singh, S. K., R. K. Singh, P. Suwal, P. K. Parajuli, I. K. Limbu, and B. B. Basnet. "The Altered Cast Technique: A Case Report." Journal of Nepalese Prosthodontic Society 3, no. 2 (July 1, 2020): 125–30. http://dx.doi.org/10.3126/jnprossoc.v3i2.36390.
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The altered cast impression technique is commonly used for the mandibular distal extension partially edentulous arches. The technique is relatively simple and improves the residual ridge to dentition relationship of the prosthesis. Due to the displaceability of the mucosa, free end saddles get displaced under occlusal load. A 45-year-female patient reported to the Department Of Prosthodontics and Crown-Bridge, College of Dental Surgery, B.P. Koirala Institute of Health Sciences, Nepal with a chief complaint of missing bilateral lower posterior teeth. Clinical examination revealed missing teeth w.r.t 36, 37, 45, 46, and 47. The treatment plan was made to rehabilitate the patient with removable partial denture using functional impression along with the altered cast technique. The altered cast technique is the best alternative technique in the case of distal extension cases because better tissue adaptability, proper extension of a denture base, equal stress distribution, better support, and stability can be achieved. Finally, increased patient comfort and function are obtained.
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Marrs, S. J., J. C. Thomason, M. J. Cowling, and T. Hodgkiess. "A Replica Method for the Study of Marine Biofilms." Journal of the Marine Biological Association of the United Kingdom 75, no. 3 (August 1995): 759–62. http://dx.doi.org/10.1017/s0025315400039199.
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A replica method involving the use of a polyvinylsiloxane impression material with a resin cast, particularly suitable in the study of marine biofilms, is described. The technique has advantages over other methods in that it is quick, non-toxic, non-destructive and inexpensive. Replicas of critical-point dried eggcases of the dogfishScyliorhinus canicula(L.) (Elasmobranchii: Squaliformes) showed the replica to be true down to the size of bacteria. It was also possible to replicate larger areas such as patches of living barnacles on an intertidal rock.The study of marine biofilms often involves the use of destructive techniques such as conventional scanning electron microscopy (SEM), histology andin vacuospectroscopic methods (Baier & Meyer, 1986), so a single surface may not be examined repeatedly. Alternatively, the surface of interest may not be amenable to examination by standard techniques due to, for example, large size or incompatibility of the material of interest. In materials science the use of replica techniques to overcome such problems have been common (Goodhew, 1973), though techniques commonly involve the use of solvents (Loh, 1989) or silicone elastomers that may have a curing period of several hours (Gordon, 1984) and are consequently unsuitable for the study of biofilms. Scott (1982) reviewed the use of dental impression materials for field use in metallurgy and in recent years, dental impression materials have been used in the study of plant morphology (Green & Linstead, 1990). In this paper we consider the use of a hydrophilic polyvinylsiloxane impression material in the study of both microscopic and macroscopic marine biofilms.
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Mailoa, Elizabeth, M. Dharmautama, and Peter Rovani. "Pengaruh teknik pencampuran bahan cetak alginat terhadap stabilitas dimensi linier model stone dari hasil cetakan Effect of mixing methods of alginate impression material on liniear dimensional stability of stone cast." Journal of Dentomaxillofacial Science 11, no. 3 (October 30, 2012): 142. http://dx.doi.org/10.15562/jdmfs.v11i3.328.
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The aim of this study was to evaluate the influence of mixing technique of dental impression materials to lineardimension stability on stone cast. Fifteen stone cast formed of pouring alginat impression material (Hydrogum 5,Zhermack) obtained from maxillary typodont (Frasaco, Italy) as master model containing four metal pillars in squarelocated in area of second premolar teeth (left and right), and two in the second molar area (left and right). Mixingtechniques were done manually and mechanically (full dan semi automatic) and by pouring with dental stone type IV(Prostone-21, BMP Formula). The results are depicted of 5 models for each mixing techniques. Measurements weremade in four parameters (ac, bd, a1b1 and c1d1) of 8 reference points on metal pillars. For this study data wasanalyzed using one-way Anova statistical test with level of significance at p <0.05 and processed with SPSS v.17. Ofthe four parameters measurement on each model, there was statistically significant processed differences of 3parameters (ac, a1b1 and c1d1), whereas one parameter (bd) had no statistically significant differences (p = 0.375). Itwas concluded that the mixing technique of fully automatic mixer shows better results in terms of dimensional stabilitycompared to the manual mixing technique and semi automatic mixer.
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Vaswani, Priya, Pronob Sanyal, and Ankur Prajapati. "Comparison of speech articulation and intelligibility in palatally contoured dentures using a novel rugae duplication technique: A clinical study." International Journal of Dental Research 3, no. 2 (August 21, 2015): 15. http://dx.doi.org/10.14419/ijdr.v3i2.5076.
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<p><strong>Background: </strong>Speech is essential to human activity. Loss of teeth is usually accompanied by eventual loss of oral morphology responsible for articulation. Palatal rugae contour has an important role in phonetics by production of linguo-palatal sounds that involves the contact between tongue and palate.</p><p><strong>Objectives<em>: </em></strong>To analyze the improvement in linguo-palatal sounds by duplicating the existing rugae in maxillary complete denture prosthesis using two different impression materials in shallow, medium & deep palatal vault configuration.<strong><em></em></strong></p><p><strong>Methods:</strong> Twenty four completely edentulous patients were selected that were categorized eight in each category of shallow, medium & deep palatal vaults. Existing rugae were duplicated using mucocompressive and mucostatic impression material, wax pattern obtained through these impressions were incorporated in maxillary dental prosthesis. Later speech was recorded and analyzed by a speech pathologist with an aid of speech rating scale over a period of eight weeks.</p><p><strong>Results: </strong>Mann-Whitney U test and Wilcoxon matched pair test showed statistical significance in speech improvement (p<0.05) when mucostatic impression derived rugae pattern was incorporated in upper arch prosthesis.</p><p><strong>Conclusion: </strong>Using the presently described rugae duplication technique, speech improvement is rapid in case when mucostatic impression material was used.</p>
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Lopes-Júnior, Itamar, Barbara de Lima Lucas, Henner Alberto Gomide, and Vanderlei Luiz Gomes. "Impression Techniques for Multiple Implants: A Photoelastic Analysis. Part I: Comparison of Three Direct Methods." Journal of Oral Implantology 39, no. 5 (October 1, 2013): 539–44. http://dx.doi.org/10.1563/aaid-joi-d-11-00040.
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The purpose of this article was to compare through photoelastic analysis the stress distribution in 3 direct transfer techniques for implants with splinting. Three photoelastic resin blocks were made with 2 implants placed parallel to each other and 2 square transfer copings splinted. Both transfers were splinted with acrylic resin chemically activated in 3 different techniques: metallic sticks (T1), prefabricated acrylic bars (T2), or dental floss (T3). A circular polariscope was used, and the distortion energy (E) was calculated in 4 periods: 20 minutes and 3, 24, and 36 hours. Statistically significant differences were found among the 3 techniques (P < .05). The dental floss presented the greatest distortion energy values (T3 = 0.469 Kgf/mm2) and the metallic sticks the lowest values (T1 = 0.0 Kgf/mm2). Thus, the metallic sticks technique (T1) appears to be the most accurate protocol to be used for implant-supported prosthesis with multiple abutments.
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Astuti, Ni Kadek Ari, Sumantri Sumantri, and Iyan Anugrah Nasir. "THE EFFECT OF 25% BELT LEAVES AND 0.2% CHLORHEXIDINE AS DISINFECTANT MATERIALS ON THE DIMENSIONAL STABILITY OF ALGINATE MOLDS." Interdental Jurnal Kedokteran Gigi (IJKG) 17, no. 2 (December 22, 2021): 103–9. http://dx.doi.org/10.46862/interdental.v17i2.2937.
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ntroduction: Dental impression material is one of the agents of infection transmission in the dentist's work environment. Cross infection can occur through the interaction of microorganisms and impression material. To prevent cross infection, it is necessary to disinfect alginate impressions. One of the effective natural ingredients that can be used as a disinfectant is betel leaf. The effect of using disinfectant can affect the dimensional stability of the alginate mold. Purpose: This study aims to determine the effect of disin- fection by spraying a decoction of 25% betel leaf and 0.2% chlorhexidine on the dimensional stability of alginate molds. Materials and Methods: The research method used was an experimental laboratory with a post-test only control g roup design using 2 7 samples consisting of three treatments (negative control group, positive control group, and treatment group) which were measured using a digital caliper. The technique us ed in this study is the spraying technique on the sample with a st orage time of 10 minutes. Results and discussion: This 25% betel leaf de coction (infusion) can be used as an alternative to disinfecting alginate impressions because there is no difference in effect between spraying 25% betel leaf decoction (infusion) and 0.2% chlorhexidine on alginate molds on changes in model physiological dimen- sions. Conclusion: the dimensional changes that occur are still within tolera- ble limits in alginate molds which were disinfected by spraying 25% betel leaf decoction and 0.2% chlorhexidine solution so that both can be used as disinfection materials for alginate impression materials