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A Novel Coping Design to Decrease Maximum Principal Stress in Zirconia Ceramic Restorations

Authors
 MooGyung Sung  ;  Chong-Hyun Han  ;  Sunjai Kim 
Citation
 JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY, Vol.23(7) : 534-539, 2014 
Journal Title
JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY
ISSN
 1059-941X 
Issue Date
2014
MeSH
Bite Force ; Ceramics/chemistry* ; Computer-Aided Design ; Crowns* ; Dental Abutments ; Dental Materials/chemistry* ; Dental Prosthesis Design* ; Dental Veneers ; Finite Element Analysis ; Humans ; Imaging, Three-Dimensional/methods ; Materials Testing ; Nonlinear Dynamics ; Resin Cements/chemistry ; Stress, Mechanical ; Surface Properties ; User-Computer Interface ; Yttrium/chemistry* ; Zirconium/chemistry*
Keywords
Zirconia ; coping ; design ; finite element analysis ; stress
Abstract
PURPOSE:
The objective of this study was to evaluate the influence of coping design modifications on maximum first principal stress (MPS) in a mathematical zirconia ceramic crown model.
MATERIALS AND METHODS:
For a nonlinear, 3D finite element analysis, a simplified tooth model was built on the basis of the average dimensions of mandibular second molars. Virtual tooth reduction was performed to model an abutment with a flat occlusal surface and 16° convergence angle between facing walls. The cement layer was set to a thickness of 100 μm. Three different copings-one with 0.5-mm constant thickness; one with constant thickness and extended lingual and proximal collars; and a novel design with zirconia beam reinforcement-were designed to simulate zirconia ceramic restorations. The novel design had strategically positioned zirconia beams on the lingual and marginal ridges to protect veneer ceramics, and was divided into three subdesigns according to the width of the zirconia beam (0.5, 0.8, and 1 mm). Combinations of vertical and horizontal load were applied over the distolingual marginal ridge, and the MPSs were evaluated.
RESULTS:
The novel design showed the lowest MPS in veneer ceramics under most loading conditions. The only exception to this was the novel design with a 0.5-mm zirconia beam width under mesial horizontal load.
CONCLUSIONS:
Compared to constant thickness coping with or without extended collars, the novel coping design reduced MPS in veneer ceramics; however, narrow zirconia beams should be avoided to prevent elevations in MPS in veneer ceramic layers.
Full Text
http://onlinelibrary.wiley.com/doi/10.1111/jopr.12147/abstract
DOI
10.1111/jopr.12147
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Prosthodontics (보철과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Sun Jai(김선재) ORCID logo https://orcid.org/0000-0002-0828-8008
Han, Jong Hyoun(한종현)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/100034
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