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Fracture Load of Monolithic CAD/CAM Lithium Disilicate Ceramic Crowns and Veneered Zirconia Crowns as a Posterior Implant Restoration

Authors
 Kim, Jee Hwan  ;  Lee, Su-Jeong  ;  Park, Jun Sub  ;  Ryu, Jae Jun 
Citation
 IMPLANT DENTISTRY, Vol.22(1) : 66-70, 2013 
Journal Title
IMPLANT DENTISTRY
ISSN
 1056-6163 
Issue Date
2013
MeSH
Cementation/methods ; Computer-Aided Design* ; Crowns* ; Dental Bonding ; Dental Implants ; Dental Porcelain/chemistry* ; Dental Prosthesis Design ; Dental Prosthesis, Implant-Supported* ; Dental Restoration Failure* ; Dental Stress Analysis/instrumentation ; Dental Veneers* ; Humans ; Materials Testing ; Microscopy, Electron, Scanning ; Molar ; Resin Cements/chemistry ; Stress, Mechanical ; Surface Properties ; Zirconium/chemistry*
Keywords
monolithic crown ; CAD/CAM ; lithium disilicate ; zirconia crown
Abstract
PURPOSE: To compare the fracture load and failure mode of the monolithic lithium disilicate crown (e.max group) and 2 types of veneered zirconia crowns, hand layer (ZV group) and heat pressed (ZP group), as a posterior implant-supported restoration.
METHODS: A total of 24 all-ceramic crowns for molar tooth were fabricated using the computer-aided design/computer-assisted manufacture (CAD/CAM) system. The e.max group crowns and zirconia copings for ZV and ZP groups were fabricated using a Cerec milling unit. The ZV group was fabricated using a hand-layer veneering method, and the ZP group using a heat-pressing method. All crowns were luted to the abutments, which were connected to implant fixtures, using resin cement. Fracture load was measured using the universal testing machine, and the fracture surface was evaluated by scanning electron microscopy.
RESULTS: The ZP group showed significantly higher fracture load (5229.3 N) compared with the e.max group (3852.1 N) and ZV group (3100.3 N). All fractures in the ZV group occurred in the veneered layer.
CONCLUSION: Monolithic CAD/CAM lithium disilicate crowns are applicable to posterior implant-supported restorations because the fracture load was higher than the average occlusal force.
Full Text
http://ovidsp.ovid.com/ovidweb.cgi?T=JS&CSC=Y&NEWS=N&PAGE=fulltext&AN=00008505-201302000-00012&LSLINK=80&D=ovft
DOI
10.1097/ID.0b013e318278a576
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Prosthodontics (보철과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Jee Hwan(김지환) ORCID logo https://orcid.org/0000-0002-0872-4906
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/86247
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