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KMID : 0362220070340020037
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Journal of The Korean Research Society for Dental Materials
2007 Volume.34 No. 2 p.37 ~ p.47
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Comparison of failure loads on the surface treated feldspathic porcelains
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Yi Yang-Jin
Cho Lee-Ra
Park Chan-Jin
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Abstract
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Although the bonding strength of surface treated feldspathic porcelain was reported many times, fracture resistance of bonded feldspathic porcelain after surface treatment has not been well studied. The aim of this study was to compare the failure loads of bonded feldspathic porcelains following three surface treatments having clinical relevance.
Ninety 1.0 mm-thick specimens were made from Mark II Vitablocs (Vita Zahnfabrik, germany) and divided into 3 groups: polished (control), sandblasted, and etched. Twenty specimens of each group were bonded to a dentin analog material base. Bonded ceramics were statically loaded until pop-in of a subsurface crack was detected by acoustic emission (AE). Ten specimens of each surface treatment condition (non?bonded) were tested under biaxial flexure. Data were analyzed using Weibull method for Weibull modulus, characteristic strength and B10 strength. ANOVA and post hoc Scheffe test were used for statistic analysis at the 95% confidence level. Crack pop-in of bonded specimen was easily detected with AE method, and all cracks were visually determined to be radial cracks originating from the bonded interface. For bonded specimen, failure loads were statistically indistinguishable (P>.05). In the biaxial flexure test, there were significant differences (P<.05) among all three groups with failure strength descending from polished (91.59 MPa), etched (81.36 MPa), and sandblasted group (70.59 MPa). After cementation, Weibull modulus of etched and sandblasted groups was decreased, while that of polished group was increased. Failure loads were highly increased after cementation. For static loading of dry specimens, a bonding effect can be confirmed. Bonding changed failure loads and failure patterns of surface treated specimen when compared to the result of biaxial test. The application of AE method helped to analyze precise failure point of bonded specimen.
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KEYWORD
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feldspathic porcelain, surface treatment, failure, acoustic emission
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