scholarly journals Evaluation of marginal adaptation of CAD/CAM vs conventional all-ceramic crowns on an implant abutment: An in vitro study

2021 ◽  
Vol 7 (2) ◽  
pp. 104-109
Author(s):  
Himanshu Aeran ◽  
Megha Sagar ◽  
Jyotsna Seth
Keyword(s):  
Marginal Adaptation ◽  
Marginal Fit ◽  
Group I ◽  
All Ceramic ◽  
Cad Cam ◽  
Marginal Discrepancy ◽  
Laboratory Procedures ◽  
Ceramic Crowns ◽  
The Mean ◽  
Vertical Gap

The survival of fixed prosthodontic restorations depends on the state of the marginal adaptation. Marginal gaps can create a favourable condition for biofilm deposition, thereby contributing to the development of caries and periodontal disease. The longevity of fixed prosthodontic restorations depends on the condition of the marginal adaptation to the abutment teeth. The presented work aimed to study, evaluate and compare the marginal adaptation of All-Ceramic crowns fabricated using conventional laboratory procedures with those fabricated using the CAD/CAM technology.To compare the marginal fit and adaptation of All- Ceramic crowns obtained by conventional techniques and crowns obtained by CAD/CAM technique. The presented study focused on a total of 20 samples divided into two groups viz. Group I (Conventional) and Group II (CAD/CAM) having 10 sample each. The samples were prepared with the straight abutment having a standardized collar height of 2mm, HIOSSEN that was mounted on acrylic blocks using implant analogue, HIOSSEN. A set of crowns was produced by 5-axis milling lithium disilicate using glass-ceramic blocks with laboratory fabrication methods. Another set of zirconia crowns was produced using CAD/CAM technology. Circumferential marginal gap measurements were taken at 12 measurement locations on the hexagonal die marked equidistant to each other. Both the samples were measured for marginal discrepancy at under the stereomicroscope.The results obtained showed that the mean vertical gap for the group II samples showed the least variation in the marginal discrepancy. Although the mean obtained for both the groups showed that the mean vertical marginal discrepancy was within the clinically acceptable level.It can be concluded that within the limitation of the study the data obtained showed that The Mean vertical gap was the maximum for Group I (Conventional group) i.e. 49.25 µm showing maximum variation in marginal fit. While the CAD/CAM Group had shown least vertical marginal discrepancy which depicts statistically significant better marginal fit than those fabricated using conventional laboratory procedures.

scholarly journals A Comparative Evaluation of Marginal Fit of Crowns Fabricated by Three All Ceramic CAD-CAM Systems Using Their Respective Scanners - An in vitro study

2012 ◽  
Vol 2 (1) ◽  
pp. 10-19
Author(s):  
Sabita M. Ram ◽  
Niku Agarwal
Keyword(s):  
Laser Scanner ◽  
Mean Value ◽  
Marginal Gap ◽  
Marginal Fit ◽  
Optical Scanner ◽  
All Ceramic ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
The Mean ◽  
Cam Systems

Abstract Aim To evaluate and compare the marginal fit of crowns fabricated by three All Ceramic CAD-CAM systems using their respective scanners. Objectives 1. To evaluate the marginal fit of All Ceramic crowns fabricated using Contact scanner- Procera system. 2. To evaluate the marginal fit of All Ceramic crowns fabricated using Optical scanner-Lava system. 3. To evaluate the marginal fit of All Ceramic crowns fabricated using Laser scanner-Cercon system. 4. To compare the marginal fit of crowns fabricated by three All Ceramic CAD-CAM systems using their respective scanner-Contact scanner, Optical scanner and Laser scanner. Materials and Methods 5 crowns fabricated with Contact scanner- Procera system (Group I), 5 crowns fabricated with Optical scanner-Lava system (Group II), 5 crowns fabricated with Laser scanner-Cercon system(Group III). The marginal fit would be evaluated at two stages for each group: A- Pre-veneering stage (coping) B-Post-veneering stage (crown). Results The mean value of marginal gap with Group IA was 27.48 +2.63 and IB was 26.13+ 0.85 and that of Group IIA was 23.27 + 0.99 and IIB 19.22 + 0.88. The mean value of marginal gap of Group IIIA was 32.80 + 2.46 and IIIB was 28.77 + 1.94. Conclusion The marginal gap was maximum with Group III and minimum with group II amongst the three used systems. The mean marginal gap values of subgroup B were less than subgroup A.

Evaluation of Marginal Fit of Two Types of Glass Ceramics (In Vitro Study)

2019 ◽  
Author(s):  
Youssef Y. Ashour
Keyword(s):  
Silicate Glass ◽  
Glass Ceramic ◽  
Inner Core ◽  
Lithium Silicate ◽  
Marginal Fit ◽  
Group I ◽  
All Ceramic ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
Lithium Silicate Glass

Background: Veneered all-ceramic restorations are associated with a high incidence of chipping and veneer delamination from the inner core. Monolithic all-ceramic crowns facilitate the fabrication process and minimize residual stresses between core and veneer. A new material,zirconia-reinforced lithium silicate(ZRL), Celtra Duo was recently introduced for fabrication of monolithic anterior crowns to overcome the aesthetic drawbacks of traditional zirconia and also to improve the strength of the lithium disilicate. Aim of the study: To examine the marginal fit of CAD/CAM: zirconia reinforced lithium disilicatand to evaluate it with Lithium silicate glass-ceramic crowns. Materials and methods: Thirty monolithic ceramic specimens will be fabricated and divided into THREE main groups; Group I: CAD/CAM ZLS Celtra Duo milled and polished, Group II CAD /CAM ZLS Celtra Duo milled and glazed & Group III: CAD/CAM Lithium silicate glass-ceramic (e.max CAD). For evaluation of the marginal fit 30 ceramic crown specimens ten specimens from each material(N=10), subgroups Ia, IIa, IIIa will be fabricated according to the manufacturers’ instructions and thermocycled to simulate one year clinical service. Marginal fit will be measured for the same specimens by using CBCT (Ia, IIa, IIIa). For evolution of marginal fit 30 ceramic crowns will be fabricated, ten crowns from each material (N=10), subgroups Ia, IIa, IIIa. Results: Will be arrangeand statistically analyzed.

The Marginal Fit of CAD-CAM Zirconia Cores with Different Proximal Margin Configurations

2007 ◽  
Vol 330-332 ◽  
pp. 1409-1412
Author(s):  
O.E. Puntsag ◽  
E.K. Bae ◽  
Jae Hoon Lee ◽  
Keun Woo Lee
Keyword(s):  
Statistical Difference ◽  
Marginal Gap ◽  
Proximal Margin ◽  
Marginal Fit ◽  
Group I ◽  
Metal Ceramic ◽  
Cad Cam ◽  
The Mean ◽  
Tooth Axis

This study evaluated the marginal fit of CAD-CAM Zirconia cores with different proximal height. Thirty Zirconia cores and ten metal ceramics crowns were used to evaluate the marginal gap. The marginal fit was determined to be perpendicular to the tooth axis between the most apical point on the coping margin (core) and the reference marks on the mesial, distal, labial, and palatal surfaces of the die at several key stages of crown fabrication; before porcelain built-up, after body porcelain built-up, and after glazing. Additionally, an opaque stage for the metal ceramic copings was compared as well. Each measurement was carried out with a microscope. The means of gaps among the groups were 58±27 -m, 69±23 -m, 89±29 -m and 80±28 -m, groups I, II, III and IV, respectively. In relation to the proximal and labiopalatal surfaces there were no statistical difference among the groups, except group I. No significant differences were observed in firing stages of all groups. The findings of this study showed that the mean marginal gap of Zirconia cores with different proximal heights fell well within the acceptable clinical ranges.

Marginal Fit Evaluation of CAD/CAM All Ceramic Crowns Obtained by Two Digital Workflows: An In Vitro Study Using Micro‐CT Technology

2019 ◽  
Vol 28 (9) ◽  
pp. 1037-1043 ◽  
Author(s):  
Ibrahim Salim Duqum ◽  
Christian Brenes ◽  
Gustavo Mendonca ◽  
Thiago Almedia Prado Naves Carneiro ◽  
Lyndon F. Cooper
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Micro Ct ◽  
Marginal Fit ◽  
All Ceramic ◽  
Cad Cam ◽  
Ct Technology ◽  
Ceramic Crowns

Influence of Thickness on Residual Stress Profile in Veneering Ceramic Layered: Measurement by Hole-Drilling

2012 ◽  
Vol 512-515 ◽  
pp. 1779-1783
Author(s):  
Lin Lin Wang ◽  
Long Quan Shao ◽  
Yuan Fu Yi ◽  
Qi Liu ◽  
Bin Deng ◽  
...  
Keyword(s):  
Residual Stress ◽  
Metal Plate ◽  
Hole Drilling ◽  
Stress Profile ◽  
Residual Stress Profile ◽  
All Ceramic ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
The Mean ◽  
Ceramic Restorations

To compare thickness of veneering ceramics dependence of the stress profile in veneering ceramic layered on zirconia and metal frameworks. Cylindrical core materials dentine ceramic specimens whose diameter is 20.0mm, thickness is 0.5mm were made with customized method, and then Upcera zirconia and metal plate were veneered, the thickness of the veneering ceramics respectively were 1.25mm, 1.50mm and 1.75mm, a total of six groups (n=10). An CAD-CAM machine was used for the drilling procedure and residual stress profile of all-ceramic crowns and metal-ceramic crowns was calculated. The mean residual stress of zirconia all-ceramic restorations were: respecitively, 60.15±5.54MPa for 1.25mm thickness of veneering; 53.37±5.12MPa for 1.50mm thickness of veneering; 45.64±4.53MPa for 1.75mm thickness of veneering. The mean residual stress of glass infiltrated alumina all-ceramic restorations were: respectively, 61.32± 5.76MPa for 1.25mm thickness of veneering; 52.45±5.35MPa for 1.50mm thickness of veneering; 45.89±4.26MPa for 1.75mm thickness of veneering. Residual stress profile of all-ceramic restorations was significantly different among specimen groups of Y-TZP and Metal plate (P>0.05). There was also significantly different among specimen groups which had same thickness of the veneering ceramics but not belonged to same frameworks (P<0.01). As the depth increases, the stress gradually increases, reaching the maximum at the interface of MV or CV. The residual stress of frameworks was tensile stress, but the residual stress of veneering porcelain interior was compress. With the veneer porcelain thickness, the residual stress of the interface gradually reduce.

Marginal Adaptation of CAD/CAM All-Ceramic Crowns Made by Different Impression Methods: A Literature Review

2018 ◽  
Vol 28 (2) ◽  
pp. e536-e544 ◽  
Author(s):  
Yeganeh Memari ◽  
Maryam Mohajerfar ◽  
Anahid Armin ◽  
Fatemeh Kamalian ◽  
Vida Rezayani ◽  
...  
Keyword(s):  
Literature Review ◽  
Marginal Adaptation ◽  
All Ceramic ◽  
Cad Cam ◽  
Ceramic Crowns

scholarly journals Analysis of vertical marginal discrepancy in feldspathic porcelain crowns manufactured with different CAD/CAM systems: Closed and open

2018 ◽  
Vol 12 (01) ◽  
pp. 123-128
Author(s):  
Fabio Kricheldorf ◽  
Cleuber Rodrigo de Souza Bueno ◽  
Wilson da Silva Amaral ◽  
Joel Ferreira Santiago Junior ◽  
Hugo Nary Filho
Keyword(s):  
Computer Aided Design ◽  
Manufacturing Systems ◽  
Marginal Adaptation ◽  
Significance Level ◽  
Significant Difference ◽  
Computer Aided ◽  
Cad Cam ◽  
Marginal Discrepancy ◽  
Feldspathic Porcelain ◽  
Ceramic Crowns

ABSTRACT Objective: The objective of this study is to compare the marginal adaptation of feldspathic porcelain crowns using two computer-aided design/computer-aided manufacturing systems, one of them is open and the other is closed. Materials and Methods: Twenty identical titanium abutments were divided into two groups: open system (OS), where ceramic crowns were created using varied equipment and software, and closed system (CS), where ceramic crowns were created using the CEREC system. Through optical microscopy analysis, we assess the marginal adaptation of the prosthetic interfaces. The data were subjected to the distribution of normality and variance. The i-test was used for the analysis of the comparison factor between the groups, and the one-way ANOVA was used to compare the variance of crown analysis regions within the group. A significance level of 5% was considered for the analyses. Results: There was a significant difference between the systems (P = 0.007), with the CS group having the higher mean (23.75 pm ± 3.05) of marginal discrepancy when compared to the open group (17.94 pm ± 4.77). Furthermore, there were no differences in marginal discrepancy between the different points between the groups (P > 0.05). Conclusions: The studied groups presented results within the requirements set out in the literature. However, the OS used presented better results in marginal adaptation.

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