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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한치과보존학회 Restorative Dentistry and Endodontics Restorative Dentistry and Endodontics 제33권 제3호
발행연도
2008.1
수록면
177 - 183 (7page)

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초록· 키워드

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It was reported that esthetic composite resin restoration reinforces the strength of remaining tooth structure with preserving the natural tooth structure. However, it is unknown how much the strength would be recovered. The purpose of this study was to compare the fracture resistance of three types of undermined cavity filled with composite resin with that of non-cavitated natural tooth. Forty sound upper molars were allocated randomly into four groups of 10 teeth. After flattening occlusal enamel, undermined cavities were prepared in thirty teeth to make three types of specimens with various thickness of occlusal structure (Group 1 􀅭 3). All the cavity have the 5 ㎜ width mesiodistally and 7 ㎜ depth bucco-lingually. Another natural 10 teeth (Group 4) were used as a control group. Teeth in group 1 have remaining occlusal structure about 1 ㎜ thickness, which was composed of mainly enamel and small amount of dentin. In Group 2, remained thickness was about 1.5 ㎜, including 0.5 ㎜ thickness dentin. In Group 3, thickness was about 2.0 ㎜, including 1 ㎜ thickness dentin. Every effort was made to keep the remaining dentin thickness about 0.5 ㎜ from the pulp space in cavitated groups. All the thickness was evaluated with radiographic Length Analyzer program. After acid etching with 37% phosphoric acid, one-bottle adhesive (Single BondTM, 3M/ESPE, USA) was applied following the manufacturer’s recommendation and cavities were incrementally filled with hybrid composite resin (Filtek Z-250TM, 3M/ESPE, USA). Teeth were stored in distilled water for one day at room temperature, after then, they were finished and polished with Sof-Lex system. All specimens were embedded in acrylic resin and static load was applied to the specimens with a 3㎜ diameter stainless steel rod in an Universal testing machine and cross-head speed was 1 ㎜/min. Maximum load in case of fracture was recorded for each specimen. The data were statistically analyzed using one-way analysis of variance (ANOVA) and a Tukey test at the 95% confidence level. The results were as follows: 1. Fracture resistance of the undermined cavity filled with composite resin was about 75% of the natural tooth. 2. No significant difference in fracture loads of composite resin restoration was found among the three types of cavitated groups. Within the limits of this study, it can be concluded the fracture resistance of the undermined cavity filled with composite resin was lower than that of natural teeth, however remaining tooth structure may be supported and saved by the reinforcement with adhesive restoration, even if that portion consists of mainly enamel and a little dentin structure.
#파절 저항성 #첨와형태 와동 #잔존 두께 #복합레진 #수복물 #Fracture strength #Undermined cavity #Remained thickness #Composite resin #Restoration

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참고문헌 (23)

참고문헌 신청
Abu-Hanna AA / 2004 / Resin composite reinforcement of undermined enamel / Oper Dent 29 (2) : 234 ~ 237 google schola Borges AFS / 2006 / Compressive strength recovered by composite onlays in primary teeth Substrate treatment and luting agent effects / J Dent 34 : 478 ~ 484 google schola Croll TP / 1995 / Lateral-access class II restoration using resin-modified glass-ionomer or silver-cermet cement / Quintessence Int 26 : 121 ~ 126 google schola Denehy GE / 1976 / Internal enamel reinforcement through micromechanical bonding / J Prosthet Dent 36 (2) : 171 ~ 175 google schola Eakle WS / 1992 / Effect of bonded gold inlays on fracture resistance of teeth / Quintessence Int 23 : 421 ~ 425 google schola

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