Influence of adjacent teeth on the accuracy of intraoral scanning systems for class II inlay preparation

2021 ◽  
Author(s):  
Jae‐Hoon Kim ◽  
Sung‐Ae Son ◽  
Hyeonjong Lee ◽  
Yeon‐Jee Yoo ◽  
Seoung‐Jin Hong ◽  
...  
Keyword(s):  
Class Ii ◽  
Intraoral Scanning ◽  
Scanning Systems

scholarly journals The Accuracy of Three Intraoral Scanners in the Oral Environment with and without Saliva: A Comparative Study

2020 ◽  
Vol 10 (21) ◽  
pp. 7762 ◽  
Author(s):  
Biagio Rapone ◽  
Cosimo Palmisano ◽  
Elisabetta Ferrara ◽  
Daniela Di Venere ◽  
Giovanni Albanese ◽  
...  
Keyword(s):  
Biological Fluids ◽  
Descriptive Analysis ◽  
Digital Impression ◽  
Standards Of Care ◽  
Permanent Teeth ◽  
Diagnostic Efficacy ◽  
Significance Level ◽  
Intraoral Scanning ◽  
Scanning Systems

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.

Accuracy of Buccal Scan Procedures for the Registration of Habitual Intercuspation

2018 ◽  
Vol 43 (6) ◽  
pp. 573-580 ◽  
Author(s):  
M Zimmermann ◽  
A Ender ◽  
T Attin ◽  
A Mehl
Keyword(s):  
Statistical Analysis ◽  
Analysis Software ◽  
Scheffe Test ◽  
Intraoral Scanning ◽  
Significant Difference ◽  
Mandibular Teeth ◽  
Post Hoc ◽  
Relationship Of ◽  
Scanning Systems

SUMMARY Clinical Relevance: Accurate reproduction of the jaw relationship is important in many fields of dentistry. Maximum intercuspation can be registered with digital buccal scan procedures implemented in the workflow of many intraoral scanning systems. Objective: The aim of this study was to investigate the accuracy of buccal scan procedures with intraoral scanning devices for the registration of habitual intercuspation in vivo. The hypothesis was that there is no statistically significant difference for buccal scan procedures compared to registration methods with poured model casts. Methods and Materials: Ten individuals (full dentition, no dental rehabilitations) were subjects for five different habitual intercuspation registration methods: (CI) poured model casts, manual hand registration, buccal scan with inEOS X5; (BC) intraoral scan, buccal scan with CEREC Bluecam; (OC4.2) intraoral scan, buccal scan with CEREC Omnicam software version 4.2; (OC4.5β) intraoral scan, buccal scan with CEREC Omnicam version 4.5β; and (TR) intraoral scan, buccal scan with Trios 3. Buccal scan was repeated three times. Analysis of rotation (Rot) and translation (Trans) parameters was performed with difference analysis software (OraCheck). Statistical analysis was performed with one-way analysis of variance and the post hoc Scheffé test (p<0.05). Results: Statistical analysis showed no significant (p>0.05) differences in terms of translation between groups CI_Trans (98.74±112.01 μm), BC_Trans (84.12±64.95 μm), OC4.2_Trans (60.70±35.08 μm), OC4.5β_Trans (68.36±36.67 μm), and TR_Trans (66.60±64.39 μm). For rotation, there were no significant differences (p>0.05) for groups CI_Rot (0.23±0.25°), BC_Rot (0.73±0.52°), OC4.2_Rot (0.45±0.31°), OC4.5β_Rot (0.50±0.36°), and TR_Rot (0.47±0.65°). Conclusions: Intraoral scanning devices allow the reproduction of the static relationship of the maxillary and mandibular teeth with the same accuracy as registration methods with poured model casts.

Comparison of an indirect impression scanning system and two direct intraoral scanning systems in vivo

2018 ◽  
Vol 23 (5) ◽  
pp. 2421-2427 ◽  
Author(s):  
Patricia Bosniac ◽  
Peter Rehmann ◽  
Bernd Wöstmann
Keyword(s):  
Scanning System ◽  
Intraoral Scanning ◽  
Scanning Systems

scholarly journals Multivariate Assessment of Marginal Fit of Three Types of Dental Crowns Using Three Scanning Systems for CAD-CAM Technology - in vitro Pilot Study

2018 ◽  
Vol 55 (3) ◽  
pp. 376-379
Author(s):  
Smaranda Buduru ◽  
Anca Mesaros ◽  
Cristian Culcitchi ◽  
Marioara Moldovan ◽  
Doina Prodan ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Marginal Fit ◽  
Dental Crowns ◽  
Intraoral Scanning ◽  
Different Types ◽  
Cad Cam ◽  
Scanning Systems ◽  
Conventional Impression ◽  
Hybrid Ceramic

The objective of this in-vitro study was to compare if there are any differences in the marginal fit of crowns fabricated by CAD/CAM technique. We used three different types of materials (two types of polymethylmetacrylate (PMMA) provided by two different manufacturers and one type of hybrid ceramic) and three different types of impressions: intraoral scanning, model scanning and conventional impression scanning. The crowns were subsequently measured with an electronic microscope at 1000X. Our results showed better results for the hybrid ceramic. The differences between the PMMA were not significant. There were no statistic differences with the ANOVA analysis between the scanning methods. Best combination in terms of marginal fit was found with hybrid ceramic and intraoral scanning.

scholarly journals INTRAORAL SCANNING SYSTEMS - A CURRENT OVERVIEW

2020 ◽  
Vol 8 (10) ◽  
pp. 1214-1223
Author(s):  
Sheela Kannan ◽  
◽  
Chalakuzhiyil Abraham Mathew ◽  
Roseline Savarimuthu Paulraj ◽  
◽  
...  
Keyword(s):  
Review Article ◽  
Routine Procedure ◽  
Clinical Recommendations ◽  
Technology Generation ◽  
Intraoral Scanning ◽  
Digital Impressions ◽  
Near Future ◽  
Scanning Systems ◽  
Conventional Impression ◽  
A Current

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.

Intraoral Scanning Systems: Need for Maintenance

2017 ◽  
pp. 27-29 ◽  
Author(s):  
Peter Rehmann ◽  
Viktor Sichwardt ◽  
Bernd Wöstmann
Keyword(s):  
Intraoral Scanning ◽  
Scanning Systems

Electron microscopy analysis of degenerating pancreatic ß cells in transgenic mice expressing the MHC Class I antigen Dd

1990 ◽  
Vol 48 (3) ◽  
pp. 548-549
Author(s):  
T. A. Stewart ◽  
D. Liggitt ◽  
S. Pitts ◽  
L. Martin ◽  
M. Siegel ◽  
...  
Keyword(s):  
Type I Diabetes ◽  
Disease Process ◽  
Class Ii ◽  
Class I ◽  
Type I ◽  
Aberrant Expression ◽  
Mhc Molecules ◽  
Endogenous Insulin ◽  
Class Ii Mhc ◽  
Ifn Γ

Insulin-dependant (Type I) diabetes mellitus (IDDM) is a metabolic disorder resulting from the lack of endogenous insulin secretion. The disease is thought to result from the autoimmune mediated destruction of the insulin producing ß cells within the islets of Langerhans. The disease process is probably triggered by environmental agents, e.g. virus or chemical toxins on a background of genetic susceptibility associated with particular alleles within the major histocompatiblity complex (MHC). The relation between IDDM and the MHC locus has been reinforced by the demonstration of both class I and class II MHC proteins on the surface of ß cells from newly diagnosed patients as well as mounting evidence that IDDM has an autoimmune pathogenesis. In 1984, a series of observations were used to advance a hypothesis, in which it was suggested that aberrant expression of class II MHC molecules, perhaps induced by gamma-interferon (IFN γ) could present self antigens and initiate an autoimmune disease. We have tested some aspects of this model and demonstrated that expression of IFN γ by pancreatic ß cells can initiate an inflammatory destruction of both the islets and pancreas and does lead to IDDM.

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