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Journal articles on the topic 'Conventional impression'
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1
Kekez, Ivna Vuković, Gordana Paić Karega, Marina Gadža, Benjamin Benzon, Ivana Medvedec Mikić, Katarina Vukojevic, and Danijela Kalibovic Govorko. "Conventional vs. Digital Dental Impression." International Journal of Reliable and Quality E-Healthcare 11, no. 1 (January 2022): 1–13. http://dx.doi.org/10.4018/ijrqeh.298631.
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Dental impressions are an important part of routine diagnostic and therapeutic dental procedures. Using conventional impression materials, the dentist captures intraoral details, and the dental technician uses impression for dental casts pouring. Intraoral scanners (IOS) are fast, accurate and more pleasant for a patient than conventional impression techniques and became a valid alternative to those procedures. Thirty-four dental students performed alginate and digital impressions on each other and filled two two-part questionnaires to reveal their preferences and expectations from both techniques. The results showed a statistically significant difference in time needed for digital and conventional impressions, with digital being faster. From the patient's perspective, the digital scan was more pleasant than the conventional impression. The majority of participants thought digital techniques would completely replace conventional techniques during their lifetime and find it necessary to implement new technologies in dental schools' curricula.
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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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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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Kim, Tae-Gyung, Sungtae Kim, Hyunmin Choi, Jae-Hoon Lee, Jae-Hong Kim, and Hong-Seok Moon. "Clinical Acceptability of the Internal Gap of CAD/CAM PD-AG Crowns Using Intraoral Digital Impressions." BioMed Research International 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/7065454.
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The purpose of this study was to compare the internal gap between CAD/CAM palladium-silver crowns and cast gold crowns generated from intraoral digital versus conventional impressions and to determine the clinical acceptability. Nickel-chrome master dies were made from the prepared resin tooth with the conventional impression method (n=40). For ICC (Intraoral, CAD/CAM) group, 10 intraoral digital impressions were made, and 10 CAD/CAM crowns of a PD-AG (palladium-silver) machinable alloy were generated. For IC (Intraoral, Cast) group, 10 gold crowns were cast from ten intraoral digital impressions. For CCC (Conventional, CAD/CAM) group, 10 CAD/CAM PD-AG crowns were made using the conventional impression method. For CC (Conventional, Cast) group, 10 gold crowns were fabricated from 10 conventional impressions. One hundred magnifications of the internal gaps of each crown were measured at 50 points with an optical microscope and these values were statistically analyzed using a two-way analysis of variance (α=0.05). The internal gap of the intraoral digital impression group was significantly larger than in the conventional impression group (P<0.05). No significant difference was observed between the CAD/CAM group and the cast group (P>0.05). Within the limitations of this in vitro study, crowns from intraoral digital impressions showed larger internal gap values than crowns from conventional impressions.
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Seo, KweonSoo, and Sunjai Kim. "A New Method to Evaluate Trueness and Precision of Digital and Conventional Impression Techniques for Complete Dental Arch." Applied Sciences 11, no. 10 (May 18, 2021): 4612. http://dx.doi.org/10.3390/app11104612.
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Purpose: The aim of this study was to present a new method to analyze the three-dimensional accuracy of complete-arch dental impressions and verify the reliability of the method. Additionally, the accuracies of conventional and intraoral digital impressions were compared using the new method. Methods: A master model was fabricated using 14 milled polyetheretherketone cylinders and a maxillary acrylic model. Each cylinder was positioned and named according to its corresponding tooth position. Twenty-five definitive stone casts were fabricated using conventional impressions of the master model. An intraoral scanner was used to scan the master model 25 times to fabricate 25 digital models. A coordinate measuring machine was used to physically probe each cylinder in the master model and definitive casts. An inspection software was used to probe cylinders of digital models. A three-dimensional part coordinate system was defined and used to compute the centroid coordinate of each cylinder. Intraclass correlation coefficient (ICC) was evaluated to examine the reliability of the new method. Independent two sample t-test was performed to compare the trueness and precision of conventional and intraoral digital impressions (α = 0.05). Results: ICC results showed that, the new method had almost perfect reliability for the measurements of the master model, conventional and digital impression. Conventional impression showed more accurate absolute trueness and precision than intraoral digital impression for most of the tooth positions (p < 0.05). Conclusions: The new method was reliable to analyze the three-dimensional deviation of complete-arch impressions. Conventional impression was still more accurate than digital intraoral impression for complete arches.
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Haddadi, Yasser, Golnosh Bahrami, and Flemming Isidor. "Accuracy of Intra-oral Scans Compared to Conventional Impression in Vitro." Primary Dental Journal 8, no. 3 (September 2019): 34–39. http://dx.doi.org/10.1308/205016819827601491.
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AIM The purpose of the present study was to assess the accuracy of intra-oral scans and conventional impression measured at various points on a single tooth preparation. Methods Ten conventional silicone impressions, and ten intra oral-scans using eight different digital intra oral digital scanners were taken of a prepared master tooth. The conventional impressions were directly digitised using a laboratory scanner. Each scan/impression was superimposed on a high-accuracy digital model of the prepared master tooth. For each superimposition, the deviation from the prepared master tooth was measured at six points on four two-dimensional cross-sections. Data was analysed using two-way analysis of variance (ANOVA). Results Most intra oral scanners had lower accuracy at the preparation margin compared to smooth surfaces. When only conventional impression and the latest intra oral scanners of various manufacturers are considered, the mean discrepancy at the preparation margin was 50μm (SD 16) for conventional impression, 15μm (SD 4) for Trios 3, 26μm (SD 4) for LAVA TDS, 29μm (SD 7) for CEREC Omnicam, 30μm (SD 6) for CS 3600 and 64μm (SD 7) for GC Aadva. The increased accuracy of Trios 3 was statistically significant (p<0.05). Conclusions At the preparation margin, Trios 3 performed significantly better than conventional impression and the other intra oral scanners. LAVA TDS, CEREC Omnicam and CS3600 showed similar accuracy at the margin, yet better than conventional impression and GC Aadva.
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Sayed, Mohammed E., Abdulkarim Hussain Alshehri, Bandar M. A. Al-Makramani, Fuad Al-Sanabani, Fawzia Ibraheem Shaabi, Fatimah H. Alsurayyie, Walaa Magdy Ahmed, Hosain Al-Mansour, and Saurabh Jain. "Accuracy of Master Casts Generated Using Conventional and Digital Impression Modalities: Part 1—The Half-Arch Dimension." Applied Sciences 11, no. 24 (December 17, 2021): 12034. http://dx.doi.org/10.3390/app112412034.
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Accurate impression-making is considered a vital step in the fabrication of fixed dental prostheses. There is a paucity of studies that compare the casts generated by various impression materials and techniques that are commonly used for the fabrication of provisional and definitive fixed prostheses. The aim of this study is to compare the accuracy of casts obtained using conventional impression and digital impression techniques. Thirty impressions were made for the typodont model (10 impressions each of polyvinyl siloxane, alginate, and alginate alternative materials). Ten digital models were printed from the same model using a TRIOS-3 3Shape intraoral scanner. Accuracy was assessed by measuring four dimensions (horizontal anteroposterior straight, horizontal anteroposterior curved, horizontal cross-arch, and vertical). A one-way ANOVA and Tukey’s test (α = 0.05) were used to analyze data. A statistically significant difference in the four dimensions of the stone casts and digital models was observed among the four groups (exception: between alginate alternative and 2-step putty–light body impression in the horizontal anteroposterior straight, horizontal anteroposterior curved, and horizontal cross-arch dimensions; between alginate and alginate alternative in the horizontal anteroposterior curved dimension; between alginate and 2-step putty–light body impression in the horizontal anteroposterior curved dimension; and between alginate alternative and digital in the vertical dimension). Polyvinyl siloxane had the highest accuracy compared to casts obtained from other impression materials and digital impressions.
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Sfondrini, Maria Francesca, Paola Gandini, Maurizio Malfatto, Francesco Di Corato, Federico Trovati, and Andrea Scribante. "Computerized Casts for Orthodontic Purpose Using Powder-Free Intraoral Scanners: Accuracy, Execution Time, and Patient Feedback." BioMed Research International 2018 (2018): 1–8. http://dx.doi.org/10.1155/2018/4103232.
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Introduction. Intraoral scanners allow direct images of oral situation, with fewer steps than conventional impressions. The purpose of this study was to compare the accuracy of digital impressions, traditional impressions, and digitalization of full-arch gypsum models, to evaluate timing of different methods and finally to study perception of patients about conventional and digital impression techniques. Methods. Dental arches of fourteen patients were evaluated by alginate impression, titanium dioxide powder-free intraoral scanning (Trios, 3Shape), and digitalization obtained from gypsum models using the same scanner. Conventional and digital techniques were evaluated through measurements (lower and upper arch anteroposterior length, lower and upper intercanine distance, and lower and upper intermolar distance) with a caliber for analogic models and using a computer software for digital models (Ortho Analyzer, Great Lakes Orthodontics). In addition, chairside and processing times were recorded. Finally, each patient completed a VAS questionnaire to evaluate comfort. Statistical analyses were performed with ANOVA and Tukey tests for accuracy measurements and paired t-test for times and VAS scores. Significance was predetermined at P<0.05. Results. The measurements obtained with intraoral scanning, gypsum models after conventional impression, and digitalized gypsum models were not significantly different. Both chairside and processing times of digital scanning were shorter than the traditional method. VAS reporting patients comfort were significantly higher when evaluating digital impression. Conclusions. Intraoral scanners used for orthodontic applications provide useful data in clinical practice, comparable to conventional impression. This technology is more time efficient than traditional impression and comfortable for patients. Further evolution with more accurate and faster scanners could in future replace traditional impression methods.
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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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Schmidt, Alexander, Leona Klussmann, Bernd Wöstmann, and Maximiliane Amelie Schlenz. "Accuracy of Digital and Conventional Full-Arch Impressions in Patients: An Update." Journal of Clinical Medicine 9, no. 3 (March 4, 2020): 688. http://dx.doi.org/10.3390/jcm9030688.
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The aim of this clinical study was to update the available data in the literature regarding the transfer accuracy (trueness/precision) of four current intraoral scanners (IOS) equipped with the latest software versions and to compare these data with conventional impressions (CVI). A metallic reference aid served as a reference dataset. Four digital impressions (Trios3Cart, Trios3Pod, Trios4Pod, and Primescan) and one CVI were investigated in five patients. Scan data were analyzed using three-dimensional analysis software and conventional models using a coordinate measurement machine. The transfer accuracy between the reference aid and the impression methods were compared. Differences with p < 0.05 were considered to be statistically significant. Overall, mean ± standard deviation (SD) transfer accuracy ranged from 24.6 ± 17.7 µm (CVI) to 204.5 ± 182.1 µm (Trios3Pod). The Primescan yielded the lowest deviation for digital impressions (33.8 ± 31.5 µm), followed by Trios4Pod (65.2 ± 52.9 µm), Trios3Cart (84.7 ± 120.3 µm), and Trios3Pod. Within the limitations of this study, current IOS equipped with the latest software versions demonstrated less deviation for short-span distances compared with the conventional impression technique. However, for long-span distances, the conventional impression technique provided the lowest deviation. Overall, currently available IOS systems demonstrated improvement regarding transfer accuracy of full-arch scans in patients.
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Albanchez-González, María Isabel, Jorge Cortés-Bretón Brinkmann, Jesús Peláez-Rico, Carlos López-Suárez, Verónica Rodríguez-Alonso, and María Jesús Suárez-García. "Accuracy of Digital Dental Implants Impression Taking with Intraoral Scanners Compared with Conventional Impression Techniques: A Systematic Review of In Vitro Studies." International Journal of Environmental Research and Public Health 19, no. 4 (February 11, 2022): 2026. http://dx.doi.org/10.3390/ijerph19042026.
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The aim of this systematic review was to evaluate the in vitro accuracy of dental implants impressions taken with intraoral scanner compared with impressions taken with conventional techniques. Two independent reviewers conducted a systematic electronic search in the PubMed, Web of Science and Scopus databases. Some of the employed key terms, combined with the help of Boolean operators, were: “dental implants”, “impression accuracy”, “digital impression” and “conventional impression”. Publication dates ranged from the earliest article available until 31 July 2021. A total of 26 articles fulfilled the inclusion criteria: 14 studies simulated complete edentation (CE), nine partial edentation (PE) and only two simulated a single implant (SI); One study simulated both CE and SI. In cases of PE and SI, most of the studies analyzed found greater accuracy with conventional impression (CI), although digital impression (DI) was also considered adequate. For CE the findings were inconclusive as six studies found greater accuracy with DI, five found better accuracy with CI and four found no differences. According to the results of this systematic review, DI is a valid alternative to CI for implants in PE and SI, although CI appear to be more accurate. For CE the findings were inconclusive, so more studies are needed before DI can be recommended for all implant-supported restorations.
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Sayed, Mohammed E., Hosain Al-Mansour, Abdulkarim Hussain Alshehri, Fuad Al-Sanabani, Bandar M. A. Al-Makramani, Maryam Hassan Mugri, Walaa Magdy Ahmed, et al. "Accuracy of Master Casts Generated Using Conventional and Digital Impression Modalities: Part 2—The Full Arch Dimension." Applied Sciences 12, no. 4 (February 18, 2022): 2148. http://dx.doi.org/10.3390/app12042148.
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The aim of this study was to evaluate the accuracy of master casts generated by conventional (putty and light body consistencies polyvinyl siloxane and alginate) and digital impression techniques on a typodont master model with full-arch-prepared abutment teeth. The null hypotheses tested were as follows: (1) no statistically significant differences in accuracy between casts made by the two impression modalities and the typodont master model at each of the four locations (horizontal straight, horizontal curved, horizontal cross arch, and vertical), and (2) no statistically significant differences in dimensions measured at each of the four locations between the casts generated using the conventional and digital impression techniques. For the conventional technique, 10 impressions each were made for the typodont model using polyvinyl siloxane and alginate impression materials, and the casts were poured. For the digital technique, the typodont model was scanned 10 times using a TRIOS-3 3Shape intraoral scanner, and the casts were printed. The measurements for the horizontal (anteroposterior and cross arch) and vertical dimensions were made using a stereomicroscope and the accuracy of fabricated casts was expressed as the percentage of deviation from the typodont master model’s values. A one-way ANOVA and Tukey’s test (p < 0.05) were used to analyze the data. In the current study, the only measurement that did not exceed 0.5% in dimensional change was with the stone casts produced by both the 3M ESPE PVS and Kromopan alginate impression materials at the HAPC dimension. The casts generated by impressions made using the 3M ESPE PVS impression material were the most accurate, whereas the casts generated by making digital impressions using the TRIOS-3 3Shape intraoral scanner were the least accurate among the three tested groups. The greatest number of distortions above 0.5% (at all dimensional locations) was produced by the digital models printed using the ASIGA 3D printer.
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Schlenz, Maximiliane Amelie, Victoria Schubert, Alexander Schmidt, Bernd Wöstmann, Sabine Ruf, and Katharina Klaus. "Digital versus Conventional Impression Taking Focusing on Interdental Areas: A Clinical Trial." International Journal of Environmental Research and Public Health 17, no. 13 (June 30, 2020): 4725. http://dx.doi.org/10.3390/ijerph17134725.
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Due to the high prevalence of periodontitis, dentists have to face a larger group of patients with periodontally compromised dentitions (PCDs) characterized by pathologic tooth migration and malocclusion. Impression taking in these patients is challenging due to several undercuts and extensive interdental areas (IAs). The aim of this clinical trial was to analyze the ability of analog and digital impression techniques to display the IAs in PCDs. The upper and the lower jaws of 30 patients (n = 60, age: 48–87 years) were investigated with one conventional impression (CVI) using polyvinyl siloxane and four digital impressions with intraoral scanners (IOSs), namely True Definition (TRU), Primescan (PRI), CS 3600 (CAR), and TRIOS 3 (TIO). The gypsum models of the CVIs were digitalized using a laboratory scanner. Subsequently, the percentage of the displayed IAs in relation to the absolute IAs was calculated for the five impression techniques in a three-dimensional measuring software. Significant differences were observed among the impression techniques (except between PRI and CAR, p-value < 0.05). TRU displayed the highest percentage of IAs, followed by PRI, CAR, TIO, and CVI. The results indicated that the IOSs are superior to CVI regarding the ability to display the IAs in PCDs.
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Studenikin, R. V., and A. A. Mamedov. "Comparison of digital scanning and conventional impression taking for implant-supported prostheses." Medical alphabet, no. 24 (September 26, 2021): 44–49. http://dx.doi.org/10.33667/2078-5631-2021-24-44-49.
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The effect of discrepancies between digital scans and conventional impressions on the clinical performance of a permanent restoration has not been fully understood.Thirty patients received conventional impressions and digital scans of a single implant restoration. Two crowns were made for the same implant using both methods. The time taken for each procedure was recorded. After analyzing the accuracy and effectiveness of both crowns, the best one was placed. A questionnaire was conducted to assess the preferences and comfort when using crowns made by one method or another.The total time for the traditional impression technique was 15 minutes, while the time for the digital scanning technique was significantly less – 10 minutes.The preparation time, including the disinfection of the silicone impressions, their transportation to the laboratory, the casting of the impressions, the hardening of the plaster, as well as the preparation of the model by the technician, was 4 hours for conventional impressions.The timing for sending the STL file and modeling the structure was less than 2 hours for the digital scan method. The production time of crowns takes 3 hours for both conventional impressions and digital ones.Of all crowns selected for placement, 46.7% were made from conventional impressions and 53.3% from digital scans. Participants preferred the digital scanning technique (89%) over the traditional impression-taking technique (11%).The data from this study suggest that digital scanning and CAD/CAM technology may be more effective and better accepted by study par-ticipants for a single implant restoration than conventional impressions and plaster casts.
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Ikram, Javed, and Nabeel Essa. "Making an open-tray implant or abutment-level impression technique easier." Dental Update 48, no. 7 (July 2, 2021): 592–93. http://dx.doi.org/10.12968/denu.2021.48.7.592.
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Various methods exist for taking implant impressions. The open-tray or pick-up impression technique is one of the conventional methods for transferring the impression coping from the implant to the impression. In this method, a window directly above the implant is made in a stock or custom tray to allow access to the impression coping. Traditionally, the window is either left open, or closed with melted wax or foil. This technique tip describes a modification to create a stable and secure seal over the opening using rayon-based adhesive tapes. The benefits of this modification over the conventional open-tray technique are due to the enhanced adhesive quality of the materials to metal or plastic. Because there is less chance of impression material leaking from the tray window into the mouth, it is more comfortable for patients and less messy for clinicians. The benefit of this method over the closed-tray technique is the ability to feel for the head of the impression coping at the same time as making sure the impression material is in good contact with the underlying structures. It is easy to use, and efficient in terms of time and cost.
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Chowdhury, Swapan, Rajesh Kumar, N. K. Ganguly, Lata Kumar, C. K. Nain, and B. N. S. Walia. "Conjunctival impression cytology with transfer (CICT) to detect pre-clinical vitamin A deficiency among slum children in India." British Journal of Nutrition 75, no. 5 (May 1996): 785–90. http://dx.doi.org/10.1079/bjn19960182.
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In order to establish a method usable in the field for diagnosis of pre-clinical vitamin A deficiency, conjunctival impression cytology with transfer (CICT) was used in 200normal slum children aged 6−120 months in Chandigarh, India. Conjunctival impressions taken on cellulose acetate paper were transferred to glass slides which were fixed in ethanol and stained with alcian blue and carbol fuchsin. Sixty samples of cellulose acetate paper were preserved after transfer of impression and were stained later. Transfer was complete in forty-eight samples and in the other twelve it was incomplete. Conjunctival impressions on paper and slide of these twelve cases were comparable. At a plasma retinol concentration of <0·70 pmol/l measured by HPLC the sensitivity, specificity and positive predictive values of CICT were 90·5%, 100% and 100% respectively. Compared with conventional conjunctival impression cytology, CICT is less time consuming, cheaper and comparable in validity. It is thus more suitable than the conventional method for mass screening
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Krishna, Ravishankar, Satyabodh S. Guttal, Saritha M. Shetty, Vibha Shetty, Meera Singh, and B. Neeraja. "Complete denture impressions: a simplified impression technique vs conventional technique for edentulous patients." Dental Update 41, no. 9 (November 2, 2014): 840–50. http://dx.doi.org/10.12968/denu.2014.41.9.840.
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Lee, Kyungmin Clara, and Seong-Joon Park. "Digital Intraoral Scanners and Alginate Impressions in Reproducing Full Dental Arches: A Comparative 3D Assessment." Applied Sciences 10, no. 21 (October 29, 2020): 7637. http://dx.doi.org/10.3390/app10217637.
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The purpose of this in vivo study was to compare in vivo full arch intraoral scans obtained using two intraoral scanners and conventional impression. Twenty patients were scanned using TRIOS and iTero scanners, as well as conventional impression. Dental models obtained from alginate impression were scanned with a laboratory desktop scanner. Individual intraoral scan data were compared with corresponding model scans using three-dimensional (3D) surface analysis. The average surface deviations were calculated for quantitative evaluation, and these values were compared between two intraoral scanners using the paired t-test. In the 3D surface analysis, most deviations between intraoral scans and model scans presented on the posterior teeth. The average surface deviations were less than 0.10 ± 0.03 mm. The results of 3D surface analysis indicated that there was 0.10 mm of overall deviation between conventional alginate impressions and in vivo full dental arch intraoral scans. Clinicians should take this into consideration when performing intraoral scanning for full dental arches.
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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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Hassan, Nurul Huda, BudiAslinie Md. Sabri, and Mohamed Ibrahim Abu Hassan. "Accuracy of In-Vivo Digital Impressions of Complete Arch with Intraoral Scanner Vs Conventional Impression - A Review." Journal of Evolution of Medical and Dental Sciences 11, no. 1 (January 31, 2022): 283–92. http://dx.doi.org/10.14260/jemds/2022/53.
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BACKGROUND We intend to evaluate the accuracy of in vivo conventional and digital methods in generating complete-arch dental models for measuring tooth dimension. METHODS Search was conducted through an electronic database in Medline, Cochrane Library, ResearchGate, PubMed and Google Scholar using query terms such as intraoral scanning; digital impression; accuracy in vivo full arch digital impression; analog impression; accuracy conventional impression; in vivo intraoral scanning; alginate impression; accuracy of plaster models; digital models; and complete arch accuracy. The outcomes were the accuracy of teeth dimension measurements in plaster models in comparison to digitized and digital models in vivo. RESULTS Nine studies matched the inclusion criteria. Two papers compared teeth measurements through plaster models and direct digital models, four papers compared plaster models and digitized models, one paper compared plaster models, digitized and direct digital models, one paper compared four different methods of direct intraoral, plaster models, direct digital and digitized models and one study reported teeth measurements from directly measured intraoral, plaster models, and direct digital models. Neither digital nor plaster models could be considered to replicate exactly the dentition, however it was agreed by the authors that intraoral scanning could represent the intraoral situation more accurately on digital models due to the lesser procedural steps, hence fewer source of error. CONCLUSIONS According to the results of the present review, although there were slight differences in readings of the measurements made on all the methods, the differences were neither statistically nor clinically significant and it is acceptable in clinical application. This review was registered in PROSPERO at CRD42020208662. KEY WORDS Intraoral Scanning, Digital Impression, Analog Impression, Digitized Model, Digital Model, Digital Impression Accuracy, Stl files, Conventional Impression Accuracy, Tooth Dimension Accuracy, Digital Model Accuracy
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Schmidt, Alexander, Leona Klussmann, Maximiliane A. Schlenz, and Bernd Wöstmann. "Elastic deformation of the mandibular jaw revisited—a clinical comparison between digital and conventional impressions using a reference." Clinical Oral Investigations 25, no. 7 (January 13, 2021): 4635–42. http://dx.doi.org/10.1007/s00784-021-03777-z.
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Abstract Objectives Due to the partly strongly differing results in the literature, the aim of the present study was to investigate a possible deformation of the mandible during mouth opening using an intraoral scanner (IOS) and a conventional impression for comparison with a reference aid. Materials and methods Four steel spheres were reversibly luted in the mandibular (n = 50) with a metallic reference aid at maximum mouth opening (MMO). Two digital impressions (Trios3), at MMO and at slightly mouth opening SMO and a conventional impression (Impregum), were taken as the measuring accuracy of the reference structure was already known. Difference between MMO-SMO for digital impressions and deviations between digital and conventional (SMO) were calculated. Furthermore, the angle between the normal vectors of two constructed planes was measured. Statistical analysis was performed with SPSS25. Results Deviations for linear distances ranged from −1 ± 3 μm up to 17 ± 78 μm (digital impressions, MMO-SMO), from 19 ± 16 μm up to 132 ± 90 μm (digital impressions, SMO), and from 28 ± 17 μm up to 60 ± 52 μm (conventional impressions, SMO). There were no significant differences for digital impressions (MMO-SMO), and there were significant differences between the conventional and digital impressions at SMO. Conclusions Based on the results of the present study, no mandibular deformation could be detected during mouth opening with regard to the digital impressions. The results were rather within the measuring tolerance of the intraoral scanner. Clinical relevance Based on the present study, no deformation of the mandibular during mouth opening could be observed at the level previously assumed. Therewith related, dental techniques related to a possible mandibular deformation therefore should be reconsidered.
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Gjelvold, Björn, Bruno Ramos Chrcanovic, Eva-Karin Korduner, Ingrid Collin-Bagewitz, and Jenö Kisch. "Intraoral Digital Impression Technique Compared to Conventional Impression Technique. A Randomized Clinical Trial." Journal of Prosthodontics 25, no. 4 (November 30, 2015): 282–87. http://dx.doi.org/10.1111/jopr.12410.
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Abuaziz, Suliman S. S., and Dr Ezzeddin M. A. Hejjaji. "Nanotechnology and Conventional Techniques to Detect Latent Fingerprints on Surfaces." International Journal for Research in Applied Science and Engineering Technology 10, no. 3 (March 31, 2022): 665–69. http://dx.doi.org/10.22214/ijraset.2022.40726.
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Abstract: This review paper centers around the use of legal science in dormant unique mark identification by the utilization of particular nanomaterials and their advantages concerning the nature of finger impression pictures. The use of measurable science in the discovery of the idle unique finger impression The benefits and significant aftereffects of studies directed on inert finger impression recognition with different nanomaterials which incorporate metal nano-particles, metallic oxide nanoparticles, semiconductor quantum specks, carbon dabs, polymer dabs, fluorescent silica nanoparticles, fluorescent mesoporous silica nanoparticles, fluorescent silica nanoparticles, formed polyelectrolyte spots, accumulation prompted outflow brilliant atom joined nanomaterials and phenomenal earth fluorescence nanoparticles are basically talked about. A portion of the nanomaterials utilized for idle finger impression discovery didn't bring about great quality finger impression pictures and these detriments are featured. Keywords: Nanotechnology, Nanomaterials, latent fingerprint, fluorescence
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Alikhasi, Marzieh, Hakime Siadat, Alireza Nasirpour, and Mahya Hasanzade. "Three-Dimensional Accuracy of Digital Impression versus Conventional Method: Effect of Implant Angulation and Connection Type." International Journal of Dentistry 2018 (June 4, 2018): 1–9. http://dx.doi.org/10.1155/2018/3761750.
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Purpose. The aim of this in vitro study was to compare the accuracy of different implant impression techniques of the maxillary full arch with tilted implants of two connection types. Materials and Methods. Two maxillary edentulous acrylic resin models with two different implant connections (internal or external) served as a reference model. Each model had two anterior straight and two posterior angulated implants. Ninety impressions were made using an intraoral scanner (Trios 3Shape) with scan bodies for digital impression (groups DII and DIE), a custom open tray with additional silicone for the conventional direct group (groups CDI and CDE), and a custom closed tray with additional silicone for the conventional indirect group (groups CII and CIE) from both internal and external models, respectively. A coordinate-measuring machine (CMM) was used to measure linear and angular displacement for conventional specimens. For digital groups, an optical CMM was used to scan the reference model. STL data sets from the digital specimen were superimposed on STL reference data sets to assess angular and linear deviations. Data were analyzed with three-way ANOVA and t-test at α=0.05. Results. There were significant angular and linear distortion differences among three impression groups (P<0.001), angular distortion differences between internal and external connections (P<0.001), and between straight and tilted implants for either linear (P<0.001) or angular (P=0.002) distortion. The type of the connection and implant angle did not have any effect on linear and angular distortion of the digital technique (p>0.05). Minimum angular and linear distortion was seen for tilted implants in DII and DIE groups (0.36° ± 0.37 and 0.16 ± 0.1 mm). Conclusion. Impression techniques (digital versus conventional) affected the transfer accuracy. Digital techniques demonstrated superior outcome in comparison with conventional methods, and the direct technique was better than the indirect conventional technique. Connection type and implant angulation were other factors that influenced accuracy. However, when digital impression was applied, accuracy was not affected by the type of connection and angulation.
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Citirik, Mehmet, Canan Altunkaya, Dilek Soba, Tolga Bicer, and Huseyin Ustun. "Comparison of Conjunctival Cytological Alterations following Conventional and Sutureless Sclerotomies." Ophthalmologica 233, no. 3-4 (2015): 230–35. http://dx.doi.org/10.1159/000371771.
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Purpose: To assess the alterations in conjunctival impression cytology following 23-gauge transconjunctival sutureless versus conventional pars plana vitrectomy. Patients and Methods: Sixty consecutive patients were enrolled in the study. Conjunctival impression cytology was performed on 30 eyes (of 30 subjects) with 23-gauge transconjunctival sutureless vitrectomy and on 30 eyes (of 30 subjects) with conventional vitrectomy. Conjunctival impression cytology was performed preoperatively on the 1st day and in the 3rd month after the surgery. Impression cytology specimens of each group were graded and scored using a range of 0-3 according to Nelson's method. Results: In the conventional pars plana vitrectomy group, statistically significant alterations in the conjunctival impression cytology were detected on the 1st postoperative day (p = 0.001) and in the 3rd postoperative month (p = 0.001), whereas in the 23-gauge transconjunctival sutureless pars plana vitrectomy group, statistically significant changes were observed on the 1st postoperative day. However, no significant changes were observed in the following 3 postoperative months (p = 0.08). Conclusion: The properties of impression cytology were altered in the early postoperative period after sutureless and conventional vitrectomy. These changes were improved in the sutureless vitrectomy group only. Sutureless vitrectomy also had an advantageous effect on the conjunctival cytological changes and conjunctival structure.
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Nandini, Yamini, KB Vinitha, and M. Smitha. "Comparison of Dimensional Accuracy of Four Different Die Materials before and after Disinfection of the Impression: An in vitro Study." Journal of Contemporary Dental Practice 14, no. 4 (2013): 668–74. http://dx.doi.org/10.5005/jp-journals-10024-1383.
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ABSTRACT Background This study was conducted to compare the linear dimensional accuracy of die materials before and after disinfection of the impression. Type IV and V conventional dental stone, type IV-resin impregnated and copper-plated die materials were studied. Materials and methods A stainless-steel master die analogs to a complete veneer crown preparation with three scribed lines (I: vertical, II and III: horizontal) was machined and measurements were made from these scribed reference lines. Impressions were made with monophase addition silicone impression material for each of the specimens. 2% glutaraldehyde was used as a disinfectant. The fabricated dies were measured to the nearest 0.0001 mm. ANOVA and post hoc was carried out using Scheffe multiple comparison test at significance level of 0.05. Results Type IV resin-impregnated dental stone and copperplated dies approximated the dimensions of the master die. Type IV and V conventional dental stone dies showed greater variation in measurements. Statistically significant differences were observed for type IV resin-impregnated and copper-plated dies in dimension I and III. For dimension II no significant differences were found for dies fabricated from four die materials. A one-way analysis of variance indicated no statistical significant differences among the two groups of dies fabricated from disinfectant treated impressions and those fabricated from nondisinfectant treated impressions. Conclusion Type IV resin-impregnated dental stone and copper-plated dies are dimensionally more accurate than type IV and V conventional dental stone die materials. No significant linear distortion in the dies fabricated from the disinfected impressions was observed. How to cite this article Nandini Y, Vinitha KB, Manvi S, Smitha M. Comparison of Dimensional Accuracy of Four Different Die Materials before and after Disinfection of the Impression: An in vitro Study. J Contemp Dent Pract 2013;14(4):668-674.
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Cappare, Paolo, Gianpaolo Sannino, Margherita Minoli, Pietro Montemezzi, and Francesco Ferrini. "Conventional versus Digital Impressions for Full Arch Screw-Retained Maxillary Rehabilitations: A Randomized Clinical Trial." International Journal of Environmental Research and Public Health 16, no. 5 (March 7, 2019): 829. http://dx.doi.org/10.3390/ijerph16050829.
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Background: The objective of this study was to compare conventional versus digital impressions for Full-Arch maxillary rehabilitations. Methods: Patients selected for this study were treated with full-arch screw-retained rehabilitations supported by six immediately loaded dental implants. Patients have been scheduled randomly into control (conventional impression group, CIG) and test (digital impression group, DIG) groups respectively for a fully conventional workflow and a fully digital workflow. In both groups, within 24 h, temporary prostheses were delivered. Four months after the implant positioning, the two groups dealt with the fabrication of definitive restorations: conventional pick-up was performed in the control group, and definitive digital impressions were carried out in the test group. The time involved following these two procedures was recorded. Patients underwent intraoral digital radiographs to evaluate the accuracy of the framework-implant connection, check for the presence of voids at the bar-implant connection and measure bone level. Criteria used to assess success at the prosthetic level were the occurrence of prosthetic maintenance, the absence of fractures of the acrylic resin superstructure and voids. Results: A total of 50 patients received immediately loaded prostheses supported by six implants (total 300 implants). A fixture and prosthetic survival rate of 100% was observed. All digital X-ray examinations revealed a bar-implant connection accuracy and no voids. Differences that were not statistically significant (p > 0.05) in marginal bone loss were found between control and test groups. Significantly less time was spent to perform digital impression procedure (p < 0.05). Conclusions: Clinical and radiological results of the test group advocate a satisfactory accuracy and predictability of the intraoral scanner (IOS) to be a reliable alternative in clinical practice for implant full-arch rehabilitations and suggest fabrication of definitive restorations with a successful marginal fit precision.
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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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Kim, Kyoung Rok, Kyoung-young Seo, and Sunjai Kim. "Conventional open-tray impression versus intraoral digital scan for implant-level complete-arch impression." Journal of Prosthetic Dentistry 122, no. 6 (December 2019): 543–49. http://dx.doi.org/10.1016/j.prosdent.2018.10.018.
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Chen, Ming-Sheh, W. A. Eichhold, Chao-Chin Chien, and D. A. Curtis. "An altered-cast impression technique that eliminates conventional cast dissecting and impression ☐ing." Journal of Prosthetic Dentistry 57, no. 4 (April 1987): 471–74. http://dx.doi.org/10.1016/0022-3913(87)90018-7.
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Gogushev, K., M. Abadzhiev, and Z. Valcheva,. "COMPARISON OF ACCURACY OF THREE-UNIT ZIRCONIA FIXED PARTIAL DENTURES MADE FROM CONVENTIONAL AND DIGITAL IMPRESSIONS – IN VITRO STUDY." EurasianUnionScientists 2, no. 3(84) (April 15, 2021): 11–17. http://dx.doi.org/10.31618/esu.2413-9335.2021.2.84.1278.
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ABSTRACT
INTRODUCTION: Nowadays, the improvement of intraoral scanning systems aims to overcome some limitations of the conventional methods and to eliminate the mistakes that can be made during the production technology and to achieve a more precise design of prosthetic restorations [7].
AIM: The aim of the present study is to evaluate and compare the marginal adaptation and the internal fit of zirconium dioxide fixed partial dentures, made by direct and indirect digital approach.
MATERIALS AND METHODS: To perform the in vitro study, a model-sample of the upper jaw was used, on which two artificial plastic teeth 24 and 26 were prepared and tooth 25 was removed. 30 virtual models were created from the prepared model. To obtain the virtual models in the first group (CIS group), 10 conventional impressions (n = 10) were taken with additive silicone impression material using a two-stage two-phase impression technique with a standard metal impression tray. For the second group (PCS group) the conventional impressions were casted wtih IV class high quality hard plaster. The ten digital impressions from the third group (ISG group) were obtained using an intraoral TRIOS scanner.
RESULTS: The highest mean value in P1 was measured in the CIS group (155.1 ± 69.96 µm), followed by the PCS group (135.62 ± 78.7 µm). The highest mean value in P2 was obtained in the CIS group (138.32 ± 63.08 µm), followed by the ISG group (117.2 ± 32.48 µm). The highest mean value in point P3 was found in the CIS group (94.525 ± 23.03 µm), while the highest mean value in point P4 was measured in the PCS group (86.34 ± 26.99 µm).
CONCLUSION: The obtained mean values regarding the marginal adaptation in all studied groups are within the clinically acceptable range. The highest values in terms of the marginal adaptation indicator were obtained in the PCS group, and the lowest - in the ISG group.
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Kurosumi, Motonori, Koji Mizukoshi, Maya Hongo, and Miyuki G. Kamachi. "Does age-dynamic movement accelerate facial age impression? Perception of age from facial movement: Studies of Japanese women." PLOS ONE 16, no. 8 (August 5, 2021): e0255570. http://dx.doi.org/10.1371/journal.pone.0255570.
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We form impressions of others by observing their constant and dynamically-shifting facial expressions during conversation and other daily life activities. However, conventional aging research has mainly considered the changing characteristics of the skin, such as wrinkles and age-spots, within very limited states of static faces. In order to elucidate the range of aging impressions that we make in daily life, it is necessary to consider the effects of facial movement. This study investigated the effects of facial movement on age impressions. An age perception test using Japanese women as face models was employed to verify the effects of the models’ age-dependent facial movements on age impression in 112 participants (all women, aged 20–49 years) as observers. Further, the observers’ gaze was analyzed to identify the facial areas of interests during age perception. The results showed that cheek movement affects age impressions, and that the impressions increase depending on the model’s age. These findings will facilitate the development of new means of provoking a more youthful impression by approaching anti-aging from a different viewpoint of facial movement.
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Lim, Jung-Hwa, Utkarsh Mangal, Na-Eun Nam, Sung-Hwan Choi, June-Sung Shim, and Jong-Eun Kim. "A Comparison of Accuracy of Different Dental Restorative Materials between Intraoral Scanning and Conventional Impression-Taking: An In Vitro Study." Materials 14, no. 8 (April 19, 2021): 2060. http://dx.doi.org/10.3390/ma14082060.
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The properties of underlying substrates influence the quality of an intraoral scan, but few studies have compared the outcomes using common restorative materials. In this study, we aimed to compare the accuracy of digital and conventional impressions recorded for four different dental materials as the substrates. Experimental crowns were produced with a metallic surface (gold or cobalt-chromium alloy (Co-Cr)) or without a metallic surface (zirconia or PMMA (polymethyl methacrylate)). A conventional impression was made in the conventional group (CON group), and gypsum models were subsequently scanned with a tabletop scanner. An intraoral scanner was used to scan the crowns either after applying a powder spray to reduce the surface reflectivity (IOS-P group) or without the powder spray (IOS group). The scans were assessed in three dimensions for precision and trueness. The accuracy did not differ between the CON and IOS groups for the non-metallic crowns. However, it was statistically different for the Co-Cr metallic crown, reducing trueness observed between groups as CON > IOS > IOS-P. The study evidences the differences in outer surface accuracy observed with a change in the substrate material to be imaged using an oral scanner and with the impression method. These findings suggest that the restoration material present in the oral cavity should be considered when selecting an impression-taking method.
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Seelbach, Paul, Cora Brueckel, and Bernd Wöstmann. "Accuracy of digital and conventional impression techniques and workflow." Clinical Oral Investigations 17, no. 7 (October 21, 2012): 1759–64. http://dx.doi.org/10.1007/s00784-012-0864-4.
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Karatas, Meltem Ozdemir, Ebru Demet Cifter, Didem Ozdemir Ozenen, Ali Balik, and Erman Bulent Tuncer. "Manufacturing Implant Supported Auricular Prostheses by Rapid Prototyping Techniques." European Journal of Dentistry 05, no. 04 (October 2011): 472–77. http://dx.doi.org/10.1055/s-0039-1698921.
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ABSTRACTMaxillofacial prostheses are usually fabricated on the models obtained following the impression procedures. Disadvantages of conventional impression techniques used in production of facial prosthesis are deformation of soft tissues caused by impression material and disturbance of the patient due to.Additionally production of prosthesis by conventional methods takes longer time. Recently, rapid prototyping techniques have been developed for extraoral prosthesis in order to reduce these disadvantages of conventional methods. Rapid prototyping technique has the potential to simplify the procedure and decrease the laboratory work required. It eliminates the need for measurement impression procedures and preparation of wax model to be performed by prosthodontists themselves In the near future this technology will become a standard for fabricating maxillofacial prostheses. (Eur J Dent 2011;5:472-477)
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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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Koulivand, Soudabeh, Safoura Ghodsi, Hakimeh Siadat, and Marzieh Alikhasi. "A clinical comparison of digital and conventional impression techniques regarding finish line locations and impression time." Journal of Esthetic and Restorative Dentistry 32, no. 2 (September 29, 2019): 236–43. http://dx.doi.org/10.1111/jerd.12527.
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Schmidt, Alexander, Maximiliane Amelie Schlenz, Haoyu Liu, Holger Sebastian Kämpe, and Bernd Wöstmann. "The Influence of Hard- and Software Improvement of Intraoral Scanners on the Implant Transfer Accuracy from 2012 to 2021: An In Vitro Study." Applied Sciences 11, no. 15 (August 3, 2021): 7166. http://dx.doi.org/10.3390/app11157166.
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This study aimed to investigate the transfer accuracy (trueness and precision) of three different intraoral scanning families using different hardware and software versions over the last decade from 2012 to 2021, compared to a conventional impression. Therefore, an implant master model with a reference cube was digitized and served as a reference dataset. Digital impressions of all three scanning families (True definition, TRIOS, CEREC) were recorded (n = 10 per group), and conventional implant impressions were taken (n = 10). The conventional models were digitized, and all models (conventional and digital) were measured. Therefore, it was possible to obtain the deviations between the master model and the scans or conventional models in terms of absolute three-dimensional (3D) deviations, deviations in rotation, and angulation. The results for deviations between the older and newer scanning systems were analyzed using pairwise comparisons (p < 0.05; SPSS 26). The absolute 3D deviations increased with increasing scan path length, particularly for the older hardware and software versions (old vs. new (MW ± SD) True Definition: 355 ± 62 µm vs. 483 ± 110 µm; TRIOS: 574 ± 274 µm vs. 258 ± 100 µm; and CEREC: 1356 ± 1023 µm vs. 110 ± 49 µm). This was also true for deviations in rotation and angulation. The conventional impression showed an advantage only regarding the absolute 3D deviation compared to the older systems. Based on the data of the present study, the accuracy of intraoral scanners is decisively related to hardware and software; though, newer systems or software do not necessarily warrant improvement. Nevertheless, to achieve high transfer accuracy, regular updating of digital systems is recommended. The challenge of increasing errors with increasing scan paths is overcome in the most recent systems. The combination of two different scanning principles in a single device seems to be beneficial.
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Ribeiro, Paulo, Mariano Herrero-Climent, Carmen Díaz-Castro, José Vicente Ríos-Santos, Roberto Padrós, Javier Gil Mur, and Carlos Falcão. "Accuracy of Implant Casts Generated with Conventional and Digital Impressions—An In Vitro Study." International Journal of Environmental Research and Public Health 15, no. 8 (July 27, 2018): 1599. http://dx.doi.org/10.3390/ijerph15081599.
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Purpose: The aim of this study was to compare the accuracy of digital dental impressions with the accuracy of impressions obtained via conventional techniques. Methods: Two different master models were created, one with parallel implants (model 1) and the other with non-parallel implants (model 2). These reference master models included 4 Klockner KL RP implants (Klockner Implant System SA, Barcelona, Spain), which were juxta-placed and equidistant in the intermentoneal region. In model 1 the implants were placed parallel to each other, whereas in model 2 the implants were placed such that there was a divergence angle of 15° between the more distal implants, and a convergence angle of 15° between the two central implants. A total of four types of impressions were obtained from model 1 (four groups, n = 10 each), including closed tray impressions with replacement abutments; open tray impression groups for dragging copings, without splinting; open tray impressions for ferrules; and impressions obtained using the 3MTM True Definition Scanner system. For model 2 three groups were created (three groups, n = 10 each), including closed tray impressions with replacement abutments; open tray impression for dragging copings, without splinting; and impressions obtained using the 3MTM True Definition Scanner system. The master models and the models obtained using conventional methods were digitalized in order to compare them via an extraoral high-resolution scanner (Imetric IScan D104i, Porretruy, Switzerland). The STL (Stereo Lithography (format for transferring 3 dimensional shape information)) digital values were loaded into reverse-engineering software and superimposed with their respective STL master models in order to evaluate deviations in three dimensions. We then analyzed the squares of the deviations in the three axes and evaluated the median and the sum of the deviation square. Statistical analysis was performed using the IBM Corp. Released 2016. IBM SPSS Statistics for Windows, Version 24.0. Armonk, NY: IBM Corp. The normality of the distributions was analyzed according to a Kolmogorov-Smirnov test. The median comparison was performed using the differences between the medians, analyzed using non-parametric Kruskal-Wallis and Mann-Whitney tests with a significance level of p < 0.05. Results: For model 1, the deviations of the digital impressions were smaller than those associated with the conventional techniques. The sum value in group D was 1,068,292, which was significantly lower than those of groups A, B, and C, which were shown to be 2,114,342, 2,165,491, and 1,265,918, respectively. This improvement was not observed when using model 2, however, where the conventional techniques yielded similar results. Group F simultaneously presented the lowest total square sum of the three deviations (1,257,835), indicating a significantly higher accuracy for this group in model 2, while the sum values were 1,660,975 and 1,489,328 for groups E and G, respectively. Conclusion: Digital impressions of full-arch models were able to achieve the accuracy of conventional impressions in an in vitro model. Nevertheless, further in vivo studies are needed to validate these in vitro results.
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Kuhn, Katharina, Heike Rudolph, David Zügel, Benjamin A. Just, Michael Hrusa, Thomas Martin, Sigmar Schnutenhaus, Jens Dreyhaupt, and Ralph G. Luthardt. "Influence of the Gingival Condition on the Performance of Different Gingival Displacement Methods—A Randomized Clinical Study." Journal of Clinical Medicine 10, no. 13 (June 22, 2021): 2747. http://dx.doi.org/10.3390/jcm10132747.
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This randomized clinical study examined the influence of the gingival condition—healthy versus mild inflammation—on sulcus representation and possible gingival recession for two gingival displacement procedures prior to conventional impression making. The interventions double cord technique or a kaolin paste containing aluminum chloride were applied to 40 probands. The opposite quadrant served as intrapersonal reference (split-mouth design). Precision impressions were then made. Extraoral digitization of the plaster models resulting from the reference impression prior to gingival displacement, the intervention impression and control impressions were the basis for the computer-aided three-dimensional analysis. After six months, a mild artificial gingivitis was induced, and the contralateral quadrant (cross-over design) was examined for the intervention. The gingivitis deteriorated the sulcus representation for the double cord technique group but did not affect the paste technique group. The gingival condition had no influence on the marginal gingiva height changes. The minor extent of those changes, which were measured up to six months after intervention at the palatal study site, were not considered to be in the clinically relevant range for gingival recession. For healthy gingiva, the cord technique showed superior sulcus representation compared to the paste technique. This advantage was lost to a great extent under the conditions of mild gingivitis.
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Rao, Shubha, R. Chowdhary, and S. Mahoorkar. "A Systematic Review of Impression Technique for Conventional Complete Denture." Journal of Indian Prosthodontic Society 10, no. 2 (June 2010): 105–11. http://dx.doi.org/10.1007/s13191-010-0020-2.
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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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Rapone, Biagio, Cosimo Palmisano, Elisabetta Ferrara, Daniela Di Venere, Giovanni Albanese, and Massimo Corsalini. "The Accuracy of Three Intraoral Scanners in the Oral Environment with and without Saliva: A Comparative Study." Applied Sciences 10, no. 21 (November 2, 2020): 7762. http://dx.doi.org/10.3390/app10217762.
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Background: with the emergence of technological innovations in the dental industry, one emerging trend has been the intraoral digitizing of patients by using intraoral scanning systems. Compared to taking conventional impressions, the use of intraoral scanners (IOS) is suitable for capturing direct optical impressions, helping to improve diagnostic efficacy, save time, reduce patient discomfort, and simplify clinical procedures. Intraoral scanning systems appear to have a high potential for providing guidance on proper standards of care. However, one main disadvantage is breathing and saliva secretion, which causes deviations, interfering with the applicability and accuracy of the optical impression. The aim of this study was to compare the validity and accuracy of three commercially available intraoral scanners, performing an analysis exploiting a wet model. Methods: an in vitro experimental study of four permanent teeth (two molars and two premolars) on the accuracy of copings obtained by subgingival preparations was performed, using an oral wet environment model. Two hundred and forty digital impressions were produced from three digital scanners using four samples. Descriptive analysis was performed using mean, standard deviation, and median. ANOVA and F-tests were performed to assess the amount of variability between the groups. For statistical analysis a 95% significance level was chosen. Results: all differences between groups were statistically significant. Conclusions: the present data implicate a huge impact of the oral biological fluids on the accuracy of digital impression to corresponding images, implying a failure of accurate impression under wetness conditions.
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Chiang, Donyau, and J. C. M. Li. "Impression creep of lead." Journal of Materials Research 9, no. 4 (April 1994): 903–8. http://dx.doi.org/10.1557/jmr.1994.0903.
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The impression creep behavior of lead was investigated using a 100 μm diameter punch at ambient and elevated temperatures (433 K-563 K) under punching stresses of 6–70 MPa. The results were compared with the data obtained from conventional creep tests reported in the literature. Unlike the indentation creep test, the impression creep test showed a steady-state velocity after a short transient period when the flat-end cylindrical punch was pushed against the lead surface by a constant load. Both the temperature and stress dependences were comparable to those of the constant stress tensile creep tests under similar conditions. A master curve for lead was established by collecting data from the impression creep tests and the constant stress tensile creep tests. The indentation creep measurements for lead were included also. However, the indentation data depend on the load applied.
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Rajeev, Vini, and Rajeev Arunachalam. "Innovative Replication and Recuperation of Complex Torus Palatinus: A Prosthodontic Case Report." World Journal of Dentistry 7, no. 4 (2016): 208–12. http://dx.doi.org/10.5005/jp-journals-10015-1398.
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ABSTRACT The prevalence and morphological appearance of torus palatinus has been well documented in the literature. However, adequate literature regarding the precise impression technique and rehabilitation of edentulous maxillary arch with torus is less. Intraoral growths present challenges when trying to capture exact details for impressions starting from the primary to the final stage since the complete seating of conventional impression trays is not possible. In addition, the ability to withstand occlusal loading is compromised as the mucosa tends to be thin. As the extensions of these bony growths can vary, the design of the prosthesis should be optimal to give adequate retention and stability to the prosthesis. Although customized disposable trays are available, they are not cost effective and involve a complex armamentarium. This case report presents a modified impression technique where optimal accuracy was achieved with a design framework having better retention and stability of the final prosthesis. How to cite this article Rajeev V, Arunachalam R. Innovative Replication and Recuperation of Complex Torus Palatinus: A Prosthodontic Case Report. World J Dent 2016;7(4):208-212.
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Suganya, S., K. Sounder Raj, and Gagan Malode. "Prosthodontic rehabilitation of compromised upper and lower residual alveolar ridges: A case report." IP Annals of Prosthodontics and Restorative Dentistry 7, no. 2 (June 15, 2021): 91–96. http://dx.doi.org/10.18231/j.aprd.2021.019.
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Residual ridge resorption is the reduction in size of the bony ridge under the mucoperiosteum. Obtaining retention and stability in a severely resorbed ridges using a conventional technique is a tedious task. The resorption occurs at a faster rate in mandibular arch as compared to the maxillary arch. In order to have a favorable prognosis for the denture therapy, impression technique selected should be based on the present state of the basal tissue support for mandible. In this article neutral zone concept was incorporated in to impression making in an effort to achieve successful mandibular complete denture. The anterior region of maxilla is the most affected area in edentulous patients. Complete denture wearers with flabby ridges may face a number of difficulties, of which major complaints would be pain, compromised stability, support, and retention and an ill-fitting denture. Special impressions often involve window technique for static impression of flabby area, which present multiple challenges. This article presents a case report of modified widow impression technique for maxillary anterior flabby tissues along with a hollow maxillary complete denture in a patient with resorbed maxillary and mandibular ridges with increased interridge distance to reduce the weight of the prosthesis and thereby enhances the retention.
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Stromeyer, Sofia, Daniel Wiedemeier, Albert Mehl, and Andreas Ender. "Time Efficiency of Digitally and Conventionally Produced Single-Unit Restorations." Dentistry Journal 9, no. 6 (June 1, 2021): 62. http://dx.doi.org/10.3390/dj9060062.
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The purpose of this in vitro study was to compare the time efficiency of digital chairside and labside workflows with a conventional workflow for single-unit restorations. The time efficiency in this specific sense was defined as the time, which has to be spent in a dental office by a dental professional performing the relevant steps. A model with interchangeable teeth on position 36 was created. These teeth were differently prepared, responding to several clinical situations to perform single-unit restorations. Different manufacturing techniques were used: For the digital workflows, CEREC Omnicam (CER) and Trios 3 (TN/TI) were used. The conventional workflow, using a dual-arch tray impression technique, served as the control group. For the labside workflow (_L) and the conventional impression procedure (CO), the time necessary for the impressions and temporary restorations was recorded and served as operating time. The chairside workflow time was divided by the time for the entire workflow (_C) including scan, design, milling and finishing the milled restoration, and in the actual working time (_CW) leaving out the chairside milling of the restoration. Labside workflow time ranged from 9 min 27 s (CER_L) to 12 min 41 s (TI_L). Entire chairside time ranged from 43 min 35 s (CER_C) to 58 min 43 s (TI_C). Pure chairside working time ranged from 15 min 21 s (CER_CW) to 23 min 17 s (TI_CW). Conventional workflow time was 10 min 39 s (CO) on average. The digital labside workflow and the conventional workflow require a similar amount of time. The digital chairside workflow is more time consuming.
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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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Kannan, Sheela, Chalakuzhiyil Abraham Mathew, and Roseline Savarimuthu Paulraj. "INTRAORAL SCANNING SYSTEMS - A CURRENT OVERVIEW." International Journal of Advanced Research 8, no. 10 (October 31, 2020): 1214–23. http://dx.doi.org/10.21474/ijar01/11956.
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Intraoral scanners (IOSs) are devices used for capturing direct optical impressions in dentistry. IOS eliminates the errors that are encountered with the conventional impression making procedures. The last decade has seen an increasing number of optical IOS devices, and these are based on different technologies. The objective of this review article is to discuss intraoral scanners with regards to its technology, generation systems, scanning paths, necessity of a powdering medium, accuracy (Trueness and precision), intermaxillary relationship registration, commercially available IOS, clinical recommendations, advantages, disadvantages, indications and contraindications. Digital impressions with IOS is likely going to be a routine procedure in dentistry in the near future.
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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.