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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2008.1
- 수록면
- 298 - 306 (9page)
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초록· 키워드
오류제보하기
STATEMENT OF PROBLEM: Effect of surface treatment of ceramic under loading does not appear to have been investigated.
PURPOSE: The aim of this study was to investigate the effect of surface treatment of esthetic ceramic, which is performed to increase the
bonding strength, on the fracture stress under controlled cyclic loading condition. MATERIAL AND METHODS: Sixty 1.0 mm-thick
specimens were made from Mark II Vitablocs (Vita Zahnfabrik, Germany) and divided into 3 groups: polished (control), sandblasted, and
etched. Specimens of each group were bonded to a dentin analog material base including micro-channels to facilitate the flow of water to
the bonding interface. Bonded ceramics were cyclically loaded with a flat-end piston in the water (500,000 cycles, 15Hz). Following completion
of cyclic loading, specimens were examined for subsurface crack formation and subsequent stress was determined and loaded to
next specimen by the staircase method according to the crack existence. RESULTS: There were significant differences of mean fatigue
limit in the sandblasted (222.86 ± 23.42 N) and etched group (222.86 ± 14.16 N) when compared to polished group (251.43 ± 10.6 N)
(P<.05; Wald-type pair-wise comparison and post hoc Bonferroni test). Of cracked specimens, surface treated group showed longer crack
propagation after 24 hours. All failures originated from the radial cracking without cone crack. Fracture resistance of this study was very
low and comparable to failure load in the oral cavity. CONCLUSION: Well controlled cyclic loading could induce clinically relevant
cracks and fracture resistance of Mark II ceramic was relatively low applicable only to anterior restorations. Surface treatment of inner surface
of feldspathic porcelain in the matsicatory area could influence lifetime of restorations.
목차
등록된 정보가 없습니다.
참고문헌 (35)
참고문헌 신청
Kelly JR / 1990 / Fracture surface analysis of dental ceramics: clinically failed restorations / Int J Prosthodont 3:430~440
Thompson JY / 1994 / Effect of surface etching on the flexure strength and fracture toughness of Dicor disks containing controlled flaws / J Dent Res 73:505~510
Tsai YL / 1998 / Influence of glass-ceramic thickness on Hertzian and bulk fracture mechanisms / Int J Prosthodont 11:27~32
Deng Y / 2002 / Characterization of damage modes in dental ceramic bilayer structures / J Biomed Mater Res 63:137~145
Shrotriya P / 2003 / Contact damage in model dental multilayers: an investigation of the influence of indenter size / J Mater Sci Mater Med 14:17~26
Thompson JY / 1994 / Effect of surface etching on the flexure strength and fracture toughness of Dicor disks containing controlled flaws / J Dent Res 73:505~510
Tsai YL / 1998 / Influence of glass-ceramic thickness on Hertzian and bulk fracture mechanisms / Int J Prosthodont 11:27~32
Deng Y / 2002 / Characterization of damage modes in dental ceramic bilayer structures / J Biomed Mater Res 63:137~145
Shrotriya P / 2003 / Contact damage in model dental multilayers: an investigation of the influence of indenter size / J Mater Sci Mater Med 14:17~26
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