유지요소의 크기와 형태가 간접복합레진과 금속간의 결합강도에 미치는 영향
THE EFFECT OF SIZE AND SHAPE OF RETENTION ELEMENT ON COMPOSITE TO METAL BOND STRENGTH
이윤정, 전윤경, 전유진,
소속 상세정보
이윤정 ( Lee Yun-Jung ) - 부산대학교 치과대학 치과보철학교실
전윤경 ( Jeon Yun-Kyung ) - 부산대학교 치과대학 치과보철학교실
전유진 ( Jeon You-Jin ) - 부산대학교 치과대학 치과보철학교실
KMID : 0362420070450050665
Abstract
Purpose: The purpose of this study was to investigate the effect of sire and shape of retention element on the bond strength of indirect composite resin and metal.
Material and Method:The metal disk specimens, each 6mm in diameter, were cast from CrCo alloy. They were divided into 8 groups by applied retention element. retention bead group $B2\;({\phi}\;0.2mm),\;B4\;({\phi}\;0.4mm),\;B6\;({\phi}\;0.6mm),\;B8\;({\phi}\;0.8mm)$, retention crystal group C2 (0.2mm), C5 (0.5mm), C8 (0.8mm) and sandblasting group SB ($110{\mu}m\;Al_2O_3$ blasting) as control. Eighty-eight metal specimens were veneered with $TESCERA^{(R)}$ Indirect resin system. One specimen of each group was sectioned and the resin-metal bonding pattern at the interface was observed under measuring microscope. Other specimens were then tested for tensile bond strength on an Instron universal testing machine at a crosshead speed of 2mm/min.
Results: 1. Compared to sandblasting, beads or crystals increased the resin-metal bond strength (P<.05). 2. 0.2mm retention crystals were most effective in improving the resin-metal bond strength (P>.05). 3. 0.2mm beads showed the highest bond strength among retention bead groups, but there was no statistically significant difference (P>.05). 4. Retention crystals tend to be higher in bond strength than retention beads due to wider surface area. 5. The larger retention element, the larger the undercut for the mechanical retention, but the gap at resin-metal interface was also increased.
Conclusion:Within the limitations of this study, 0.2mm retention crystals were most effective in improving the resin-metal bond strength.
키워드
Retentive element;Bond strength;Composite resin
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