Micro-CT Evaluation of the Marginal and Internal Fit of Crown and Inlay Restorations Fabricated Via Different Digital Scanners belonging to the Same CAD-CAM System

2021 ◽  
Author(s):  
Zeynep Ekici ◽  
Mehmet Kılıçarslan ◽  
Burak Bilecenoğlu ◽  
Mert Ocak
Keyword(s):  
Micro Ct ◽  
Cad Cam ◽  
Ct Evaluation ◽  
Internal Fit

scholarly journals The affects of cement space thickness and material type with application of micro-CT scanner on marginal discrepancy of restoration

2020 ◽  
Vol 24 (1) ◽  
Author(s):  
Mosharraf Mosharraf ◽  
Amir Azizi ◽  
Babak Naziri ◽  
Majid Abolhasani
Keyword(s):  
Clinical Success ◽  
Micro Ct ◽  
Ct Scanner ◽  
3D Scanner ◽  
Cad Cam ◽  
Monolithic Zirconia ◽  
Marginal Discrepancy ◽  
Spss Software ◽  
Internal Fit

Objective: Studies demonstrated that as one of the newly developed restorative materials, monolithic zirconia resolved several issues of zirconia restoration. Therefore, marginal accuracy and internal fit are necessary for clinical success and quality of restorations, and cement space may influence the marginal fit. Thus, the present research aimed to investigate the effects of the cement thickness and kind of restoration on the marginal discrepancy. Material and methods: In this study, 20 maxillary left first molars, prepared by DRSK Co., were used to fabricate a full crown. Two types of material included monolithic zirconia (Zolid) and Sintron were used to make a full crown. Samples from each group were scanned by dental laboratory 3D scanner and designed and processed using CAD-CAM. The samples were divided into four groups of five with 30- and 50- µm cement spaces. In order to assess the vertical marginal discrepancy, the crowns were fitted on their respective teeth without using any mediator and examined by a micro-CT scanner. Data were analyzed by SPSS software. Results: It has been found that marginal discrepancy in Sintron is higher than the discrepancy of monolithic zirconia. In fact, monolithic zirconia with 50-micron cement space exhibited the least marginal discrepancy and the cement space in Sintron did not significantly influence the marginal discrepancy. Conclusion: It has been concluded that the material kinds and cement space influence the restoration marginal discrepancy constructed by digital workflow.  KEYWORDSDental cements; Dental marginal adaptation; X-Raymicrotomography.

scholarly journals Micro-CT Analysis of Y-TZP Copings Made by Different CAD/CAM Systems: Marginal and Internal Fit

2018 ◽  
Vol 2018 ◽  
pp. 1-4 ◽  
Author(s):  
Rafaella Caramori Saab ◽  
Leonardo Fernandes da Cunha ◽  
Carla Castiglia Gonzaga ◽  
Amanda Mahammad Mushashe ◽  
Gisele Maria Correr
Keyword(s):  
Tetragonal Zirconia ◽  
Micro Ct ◽  
Ceramic System ◽  
Cad Cam ◽  
Ceramic Blocks ◽  
Ct Analysis ◽  
Ct Technology ◽  
Internal Adaptation ◽  
Internal Fit ◽  
Ceramic Crown

Purpose. The aim of the study was to measure the marginal and internal adaptation (MIA) of zirconia copings, made of 4 ceramic systems for CAD/CAM, using microcomputed tomography (micro-CT) technology. Material and Methods. Two identical stainless steel models were used, representing a preparation for full ceramic crown on a lower molar. The master models were then scanned for the production of copings from specific yttrium oxide partially stabilized tetragonal zirconia polycrystal ceramic blocks of each system (n=10): Cerec/inCoris Zi, Sirona; Cercon/Cercon base, Dentsply; Ceramill/Ceramill Zi, Amann Girrbach; and Lava/Lava Frame Zirconia, 3M ESPE. MIA was evaluated measuring 4 points as follows: marginal gap (MG), axial wall gap (AW), axio-occlusal angle gap (AO), and central occlusal area gap (CO). The data were statistically analyzed by ANOVA and Tukey’s test (α = 0.05). Results. The ceramic system Lava showed greater internal desadaptation (80.75 ± 22.69 µm) while CEREC presented the lowest values (49.92 ± 11.77 µm). There were significant differences between the measurement points evaluated. CO demonstrated the greater values (77.03 ± 22.61 µm). All marginal and internal adaptation values were considered clinically acceptable. Conclusion. It was concluded that there was an influence of the type of ceramic system in marginal and internal adaptation of copings in zirconia.

scholarly journals Effect of various digital cement space settings on the adaptation of CAD/CAM occlusal veneer “micro-ct evaluation”

2020 ◽  
Author(s):  
Adel A. ELBADAWY ◽  
Mohammed H. ABD ELAZIZ ◽  
Ahmed A. ALNAZZAWI ◽  
Sary S. BORZANGY
Keyword(s):  
Micro Ct ◽  
Cad Cam ◽  
Ct Evaluation

Evaluation of marginal and internal fit of lithium disilicate CAD-CAM crowns with different finish lines by using a micro-CT technique

2021 ◽  
Author(s):  
Maria Rizonaki ◽  
Wolfgang Jacquet ◽  
Peter Bottenberg ◽  
Lennert Depla ◽  
Matthieu Boone ◽  
...  
Keyword(s):  
Lithium Disilicate ◽  
Micro Ct ◽  
Ct Technique ◽  
Cad Cam ◽  
Internal Fit

scholarly journals Digital Procedures Compared to Conventional Gypsum Casts in the Manufacturing of CAD/CAM Adhesive Restorations: 3D Surface Trueness and Interfacial Adaptation Analysis

2021 ◽  
Vol 11 (11) ◽  
pp. 5060
Author(s):  
Andrea Baldi ◽  
Allegra Comba ◽  
Edoardo Alberto Vergano ◽  
Michail L. Vakalis ◽  
Mario Alovisi ◽  
...  
Keyword(s):  
Ct Scan ◽  
Ex Vivo ◽  
Micro Ct ◽  
Marginal Fit ◽  
Cad Cam ◽  
Ct Analysis ◽  
3D Printed ◽  
Tooth Preparation ◽  
Internal Fit ◽  
Ex Vivo Study

Objective. The purpose of this ex vivo study was to compare the trueness of traditional and digital workflows and to analyze the interfacial fit of CAD/CAM restorations on gypsum and 3D-printed casts (3DC). Methods: Forty patients underwent indirect posterior adhesive restorations. After tooth preparation, both traditional and chairside procedures were followed. Obtained models were scanned to generate STL files of the intraoral impression (IOS), the conventional cast (RS), and the 3D-printed cast (3DCS). Superimposition of the casts was performed to evaluate trueness. Then, for each preparation, two identical CAD/CAM restorations were milled and luted on RS and 3DC. Micro-CT scan was performed to evaluate 3D interfacial fit. Results. Surface trueness analysis showed no significant differences among groups (p > 0.05), with average trueness ranging from 11.56 to 17.01 µm. Micro-CT analysis showed significant differences between gypsum casts (average ranging from 135.78 to 212.31 µm) and 3DC (average ranging from 57.63 to 144.55 µm) for both marginal and internal fit. Conclusions. In adhesive restorations manufacturing, digital and conventional procedures generate casts that are not significantly different. Marginal fit of adhesive restorations is similar to conventional crown design and clinically acceptable. It is assumable that a direct digital workflow could benefit from the usage of 3DC.

Micro-CT evaluation of marginal and internal fit of cemented polymer infiltrated ceramic network material crowns manufactured after conventional and digital impressions

2019 ◽  
Vol 63 (1) ◽  
pp. 40-46 ◽  
Author(s):  
Rinet Dauti ◽  
Barbara Cvikl ◽  
Bledar Lilaj ◽  
Patrick Heimel ◽  
Andreas Moritz ◽  
...  
Keyword(s):  
Micro Ct ◽  
Digital Impressions ◽  
Ct Evaluation ◽  
Internal Fit

scholarly journals Marginal and Internal Fit of Ceramic Prostheses Fabricated from Different Chairside CAD/CAM Systems: An In Vitro Study

2021 ◽  
Vol 11 (2) ◽  
pp. 857
Author(s):  
Keunbada Son ◽  
Kyu-Bok Lee
Keyword(s):  
Computer Aided Design ◽  
In Vitro Study ◽  
Vitro Study ◽  
Marginal Gap ◽  
Significant Difference ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
Internal Fit ◽  
Cam Systems

The purpose of this in vitro study was to evaluate marginal and internal fits of ceramic crowns fabricated with chairside computer-aided design and manufacturing (CAD/CAM) systems. An experimental model based on ISO 12836:2015 was digitally scanned with different intraoral scanners (Omnicam (CEREC), EZIS PO (DDS), and CS3500 (Carestream)). Ceramic crowns were fabricated using the CAD/CAM process recommended by each system (CEREC, EZIS, and Carestream systems; N = 15). The 3-dimensional (3D) marginal and internal fit of each ceramic crown was measured using a 3D inspection software (Geomagic control X). Differences among the systems and various measurements were evaluated using the Kruskal–Wallis test. Statistically significant differences were validated using pairwise comparisons (α = 0.05). Occlusal gaps in the CEREC, EZIS, and Carestream groups were 113.0, 161.3, and 438.2 µm, respectively (p < 0.001). The axial gaps were 83.4, 78.0, and 107.9 µm, respectively. The marginal gaps were 77.8, 99.3, and 60.6 µm, respectively, and the whole gaps were 85.9, 107.3, and 214.0 µm, respectively. Significant differences were observed with the EZIS system compared with the other two systems in terms of the marginal gap sizes. The CEREC system showed no significant differences among the four measured regions. However, the EZIS and Carestream systems did show a statistically significant difference (p < 0.05). All three systems were judged to be capable of fabricating clinically acceptable prostheses, because the marginal gap, which is the most important factor in the marginal fit of prostheses, was recorded to be below 100 µm in all three systems.

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