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Influence of internal-gap width and cement type on the retentive force of zirconia copings in pullout testing

Authors
 Yong-Ha Son  ;  Chong-Hyun Han  ;  Sunjai Kim 
Citation
 JOURNAL OF DENTISTRY, Vol.40(10) : 866-872, 2012 
Journal Title
JOURNAL OF DENTISTRY
ISSN
 0300-5712 
Issue Date
2012
MeSH
Cementation/methods ; Composite Resins/chemistry ; Computer-Aided Design ; Crowns* ; Dental Abutments ; Dental Cements/chemistry* ; Dental Etching/methods ; Dental Marginal Adaptation* ; Dental Materials/chemistry* ; Dental Prosthesis Design ; Dental Prosthesis Retention* ; Dental Stress Analysis/instrumentation ; Glass Ionomer Cements/chemistry ; Humans ; Materials Testing ; Microscopy, Electron, Scanning ; Resin Cements/chemistry ; Stress, Mechanical ; Surface Properties ; Temperature ; Time Factors ; Tooth Preparation/methods ; Zirconium/chemistry*
Keywords
Zirconia coping ; Internal gap width ; Cement ; Retentive force ; Pullout test
Abstract
OBJECTIVES: The purpose of this study was to evaluate the influence of internal-gap width and cement type on the retentive force of zirconia copings.

METHODS: A CAD/CAM system was used to mill 48 identical abutments on extracted human molars and fabricate 48 zirconia copings. The internal-gap width for cement was set to 40 μm or 160 μm (n=24 each). Three cement types (Panavia F, RelyX Unicem, and RelyX Luting) were used with each internal-gap width (n=8/cement type). The intaglio surfaces of the copings were airborne-particle abraded, and each coping was cemented onto the corresponding abutment using the indicated luting agent. After 10,000 cycles of thermocycling, the retentive force was evaluated by pullout tests. Kruskal-Wallis and Wilcoxon Rank Sum tests were used for data analysis (α=0.05).

RESULTS: In the 40-μm gap groups, Panavia F had the highest mean retentive force compared to RelyX Unicem and RelyX Luting (P<0.000). In 160-μm gap groups, RelyX Unicem had the highest mean retentive force compared to Panavia F and RelyX Luting (P<0.000).

CONCLUSIONS: With the increase in internal gap width, a resin cement with self-etching agents as a co-initiator for autopolymerization resulted in significantly decreased retentive force, whereas a resin-modified glass ionomer cement or a self-adhesive resin cement did not. Use of resin cements rather than resin-modified glass ionomer cements improved the retentive force of zirconia copings regardless of the amount of internal gap width.
Full Text
http://www.sciencedirect.com/science/article/pii/S0300571212001832
DOI
22819954
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
Son, Yong Ha(손용하)
Han, Jong Hyoun(한종현)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/90751
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