치과용 니켈-크롬합금에 대한 표면 처리가 인장접착강도에 미치는 영향

The effects of surface treatment of dental nickel-chromium alloy on tensile bond strength

본 연구에서는 치과용 니켈-크롬합금의 표면에 전처리없이 치과용 브라켓을 Super-bond로 접한 대조군과 샌드블라스팅 및 tin-plating을 각각 혹은 병용으로 표면처리 후 Super-bond로 접한 실험각군의 인장접착강도, 브라켓탈락양상 및 주사전자현미경 소견을 비교하여 임상적용 가능성을 알아보고자 하였으며 다음과 같은 결과를 얻었다. 1. 인장장접착강도는 니켈-크롬합금의 샌드블라스팅 처리후 Super-bond로 브라켓을 접착한 실험군 I군이 14.41&#177;2.24MPa로 가장 높았고, tin-plating처리후 Super-bond로 접착한 실험 III군이 13.59&#177;1.51MPa, 샌드블라스팅후 tin-plating처리를 하고 Super-bond로 접착한 실험 II군이 12.27&#177;1.45MPa, 특정한 표면처리 없이 Super-bond로 접착한 대조군이 10.50&#177;1.57MPa로 가장 낯게 나타났으나 실험군 I군과 실험군 III군간, 실험군 III군과 실험 II군간, 실험 II군과 대조군간에는 유의한 차이가 없었다(P<0.05). 2. 브라켓의 주된 탈락양상은 대조군의 경우 70%가 브라켓고 접착제 계면에서 adhesive failure를, 30%가 니켈-크롬합금과 접착제 계면에서 adhesive failure를 나타내었고, 실험 각군은 모두 브라켓과 접착제 계면에서 adhesive failure를 나타내었다. 3. 주사전자현미경 소견에서 대조군의 경우 일부 레진이 브라켓 기저

This study was conducted to evaluate the tensile bond strength by bonding the dental bracket with Super-bond after treating the surface of dental Nickel-Chromium alloy with sandblasting, sandblasting &amp; tin-plating, respectively, and tin-plating. 10 pieces of Nickel-Chromium alloys with brackets bonded with Super-bond without their surface treatment were sampled as a control group, 20 pieces of Nickel-Chromium alloy brackets bonded with Super-bond after treating them with sandblasting as group I, 20 pieces of Nickel-Chromium alloys tin-plated and bonded with Super-bond after sandblasting as group II, and then 20 pieces of alloys with brackets bonded with Super-bond after tin-plating as group III. The result of those examination and comparison is summarized as follows: 1. Group I showed the mean tensile bond strength of 14.41±2.24MPa which was highest among 4 groups, followed by group III( 13.59±L51MPa ), group II( 12.27±1.45MPa ), and control group( 10.50±1.57MPa ), respectively. However, it was shown that them was no statistically significant difference between group I and III, group III and II, and group II and control group( P&gt;005 ). 2. The main failure pattern of those brackets showed that 70% of the control group had an adhesive failure at the bracket Superbond interface, and 30% at the Nickel-Chromium alloy-Superbond interface, while other groups did the adhesive failure at the bracket-Superbond interface. 3. When examined under SEM, it was shown that adhesives were mostly attached to the surface of the Nickel-Chromium alloy for all groups while a considerable quantity of adhesives were attached to the bracket base. Then, those samples treated only with sandblasting showed the most even and remarkable roughness of their surface.