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 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 The Tooth as a Basis for Biomimetic Design

2000 ◽  
Author(s):  
Van P. Thompson ◽  
Stephen Kao ◽  
Ivory Kirkpatrick
Keyword(s):  
High Cycle Fatigue ◽  
Critical Role ◽  
Contact Loads ◽  
All Ceramic ◽  
Cad Cam ◽  
Molar Teeth ◽  
Natural Teeth ◽  
Wide Transition ◽  
Ceramic Crowns ◽  
Improved Performance

Abstract Teeth are uniquely capable of withstanding high forces (>200 N) with small contact area (< 0.5 mm2) and a high number of fatigue cycles (> 107) with little evidence of damage. Yet the tooth is comprised of an outer very brittle, anisotropic, highly crystalline enamel layer supported by an inner soft, but tough dentin. These structures are joined by a small (appoximately 30 microns wide) transition zone called the dento-enamel junction (DEJ). The DEJ plays a critical role in transfer of stress across the layers of the tooth. How the enamel-dentin complex (EDC) comprised of these layers and the DEJ is able to withstand the high contact loads and high cycle fatigue is not well understood. An understanding of the interplay of the various components would serve as the basis for design of dental ceramic or resin based composite crowns capable of service lives approaching those on natural teeth. Current all ceramic crowns have high failure rates (1–5% per yr) on molar teeth and improved performance is required before CAD-CAM restorations can be successful.

scholarly journals Toughening of CAD/CAM all-ceramic crowns by staining slurry

2012 ◽  
Vol 31 (5) ◽  
pp. 828-834 ◽  
Author(s):  
Mitsunori UNO ◽  
Ryugo NONOGAKI ◽  
Tokushi FUJIEDA ◽  
Hajime ISHIGAMI ◽  
Masakazu KURACHI ◽  
...  
Keyword(s):  
All Ceramic ◽  
Cad Cam ◽  
Ceramic Crowns

scholarly journals In Vitro Study on Marginal and Internal Fit of CAD/CAM All-ceramic Crowns

2005 ◽  
Vol 24 (3) ◽  
pp. 456-459 ◽  
Author(s):  
Takashi NAKAMURA ◽  
Hideaki TANAKA ◽  
Soichiro KINUTA ◽  
Takeshi AKAO ◽  
Kei OKAMOTO ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
All Ceramic ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
Internal Fit

Premolar Axial Wall Height Effect on CAD/CAM Crown Retention

2016 ◽  
Vol 41 (6) ◽  
pp. 666-671 ◽  
Author(s):  
C Gillette ◽  
R Buck ◽  
N DuVall ◽  
S Cushen ◽  
M Wajdowicz ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Lithium Disilicate ◽  
Resin Cement ◽  
Failure Resistance ◽  
All Ceramic ◽  
Computer Aided ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
Aided Design ◽  
Post Hoc

SUMMARY Objective: To evaluate the significance of reduced axial wall height on retention of adhesively luted, all-ceramic, lithium disilicate premolar computer-aided design/computer-aided manufacturing (CAD/CAM) crowns based on preparations with a near ideal total occlusal convergence of 10°. Methods: Forty-eight recently extracted premolars were randomly divided into four groups (n=12). Each group received all-ceramic CAD/CAM crown preparations featuring axial wall heights of 0, 1, 2, and 3 mm, respectively, all with a 10° total occlusal convergence. Scanned preparations were fitted with lithium disilicate all-ceramic crowns that were luted with a self-etching resin cement. Specimens were tested to failure at a 45° angle to the tooth long axis with failure load converted to megapascals (MPa) based on the measured bonding surface area. Mean data were analyzed using analysis of variance/Tukey's post hoc test (α=0.05). Results: Lithium disilicate crowns adhesively luted on preparations with 0 axial wall height demonstrated significantly less failure resistance compared with the crowns luted on preparations with axial wall heights of 1 to 3 mm. There was no failure stress difference between preparations with 1 to 3 mm axial wall height. Conclusions: Under conditions of this study, adhesively luted lithium disilicate bicuspid crowns with a total occlusal convergence of 10° demonstrated similar failure resistance independent of axial wall height of 1 to 3 mm. This study provides some evidence that adhesion combined with an ideal total occlusal convergence may compensate for reduced axial wall height.

Chipping behaviour of all-ceramic crowns with zirconia framework and CAD/CAM manufactured veneer

2012 ◽  
Vol 40 (2) ◽  
pp. 154-162 ◽  
Author(s):  
M. Schmitter ◽  
D. Mueller ◽  
S. Rues
Keyword(s):  
All Ceramic ◽  
Cad Cam ◽  
Ceramic Crowns

Evaluation of marginal adaptation of all-ceramic crowns and metal ceramic crowns

1991 ◽  
Vol 66 (4) ◽  
pp. 426-431 ◽  
Author(s):  
Farhad Vahidi ◽  
Erwin T. Egloff ◽  
Francis V. Panno
Keyword(s):  
Marginal Adaptation ◽  
All Ceramic ◽  
Metal Ceramic ◽  
Ceramic Crowns
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