Marginal fit of CAD CAM all ceramic inlays: preliminary study

2018 ◽  
Author(s):  
Luciana M. Goguta ◽  
Andrei Gavrilovici ◽  
Anca Jivanescu ◽  
Florin Topala
Keyword(s):  
Marginal Fit ◽  
Ceramic Inlays ◽  
All Ceramic ◽  
Cad Cam ◽  
Preliminary Study

Marginal Fit of Heat-pressed vs CAD/CAM Processed All-ceramic Onlays Using a Milling Unit Prototype

2008 ◽  
Vol 33 (6) ◽  
pp. 644-650 ◽  
Author(s):  
S. Reich ◽  
S. Gozdowski ◽  
L. Trentzsch ◽  
R. Frankenberger ◽  
U. Lohbauer
Keyword(s):  
Clinical Relevance ◽  
Clinical Performance ◽  
Important Influence ◽  
Marginal Gap ◽  
Marginal Fit ◽  
All Ceramic ◽  
Cad Cam ◽  
Ceramic Restorations

Clinical Relevance The marginal fit of all-ceramic restorations has an important influence on the clinical performance and lifetime of adhesively luted restorations. In proximal boxes, an average marginal gap of less than 100 μm is claimed. These clinical requirements are fulfilled by both processing procedures.

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.

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

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.

scholarly journals Effects of Computer-Aided Manufacturing Technology on Precision of Clinical Metal-Free Restorations

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Ki-Hong Lee ◽  
In-Sung Yeo ◽  
Benjamin M. Wu ◽  
Jae-Ho Yang ◽  
Jung-Suk Han ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Computer Aided Manufacturing ◽  
Marginal Fit ◽  
Significance Level ◽  
Metal Free ◽  
All Ceramic ◽  
Computer Aided ◽  
Cad Cam ◽  
Aided Design ◽  
Cam Systems

Purpose. The purpose of this study was to investigate the marginal fit of metal-free crowns made by three different computer-aided design/computer-aided manufacturing (CAD/CAM) systems.Materials and Methods. The maxillary left first premolar of a dentiform was prepared for all-ceramic crown restoration. Thirty all-ceramic premolar crowns were made, ten each manufactured by the Lava system, Cercon, and Cerec. Ten metal ceramic gold (MCG) crowns served as control. The marginal gap of each sample was measured under a stereoscopic microscope at 75x magnification after cementation. One-way ANOVA and the Duncan’s post hoc test were used for data analysis at the significance level of 0.05.Results. The mean (standard deviation) marginal gaps were 70.5 (34.4) μm for the MCG crowns, 87.2 (22.8) μm for Lava, 58.5 (17.6) μm for Cercon, and 72.3 (30.8) μm for Cerec. There were no significant differences in the marginal fit among the groups except that the Cercon crowns had significantly smaller marginal gaps than the Lava crowns(P<0.001).  Conclusions. Within the limitation of this study, all the metal-free restorations made by the digital CAD/CAM systems had clinically acceptable marginal accuracy.

Marginal Fit of Implant-Supported All-Ceramic Zirconia Frameworks

2013 ◽  
Vol 39 (4) ◽  
pp. 417-424 ◽  
Author(s):  
Hanaa Hassan Zaghloul ◽  
Jihan Farouk Younis
Keyword(s):  
Cyclic Loading ◽  
Computer Aided Design ◽  
Control Group ◽  
Marginal Gap ◽  
Marginal Fit ◽  
Mean Values ◽  
Significant Difference ◽  
All Ceramic ◽  
Computer Aided ◽  
Cad Cam

This study evaluated the effect of fabrication techniques and cyclic loading on the vertical marginal fit of implant-supported fixed partial denture (FPD) frameworks. Thirty implant-supported 3-unit FPD frameworks were fabricated on a model system, divided into 3 equal groups (n = 10). The first group (control) was constructed from base metal alloy; the other 2 test groups were constructed from all-ceramic zirconia using a computer-aided design/computer-aided manufacturing (CAD/CAM) Cerec 3 system and a copy milling (Zirkonzahn) system. A cyclic load of 200 N was applied to each framework for up to 50,000 cycles. Linear measurements were made in micrometers of the vertical gap between the framework and the implant-supported abutment at 16 predetermined points before and after cyclic loading. The frameworks were viewed using scanning electron microscopy to inspect any fractographic features. One-way analysis of variance was performed to compare the marginal discrepancy values of the control and the 2 test groups and for each group; a t test was applied to determine whether significant changes in the fit were observed after cyclic loading (α = 0.05). The CAD/CAM group showed significantly higher marginal gap mean values (80.58 μm) than the Zirkonzahn and control groups (50.33 μm and 42.27 μm, respectively) with no significant difference. After cyclic loading, the CAD/CAM group recorded the highest marginal gap mean value (91.50 ± 4.260 μm) followed by control group (72.00 ± 2.795 μm); the Zirkonzahn group recorded the lowest marginal gap (65.37 ± 6.138 μm). Cyclic loading significantly increased the marginal gap mean values in the control group only. A marginal chip was observed in one of the CAD/CAM ceramic frameworks. Within the limitations of this study, the fabrication technique influenced the marginal fit of the implant-supported 3-unit FPD frameworks. Cyclic loading failed to change the fit of all-ceramic zirconia frameworks, whereas significant changes were found in the metal frameworks.

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.

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