접착성가공의치에서 세멘트 종류가 전단결합강도에 미치는 영향

EFFECT OF VARIOUS RESIN CEMENTS TO THE SHEAR BOND STRENGTH IN THE ADHESION BRIDGE

교정치료을 위해 발거된 소구치를 사용하며 레진에 고정한 후 직경 4mm이상의 법랑질 평면을 얻었다. 직경 4mm의 아크릴릭 봉을 길이 5mm로 해서 Ni-Cr 비귀금속 합금으로 주조한 후, 사용될 표면을 전기화학적 식각처리 하였다. 각 실험군당 시편 42개를 I군은 Panavia 21, II군은 Superbond, III군은 All-Bond로 세멘트 한 후 1일, 15일, 그리고 30일에 각 군당 14개의 시편을 임의로 취득하여 인스트론 만능시험기에 특별히 만든 Jig를 사용하여 거상하고 cross-head speed 1mm/min으로 전달결합강도를 측정하였다. 세멘팅한 후 1일에 측정한 전달결합강도는 Panavia-21의 I군에서 $32.7{\pm}9.9kg$중, Super-bond의 II군에서 $25.9{\pm}5.9kg$중, 그리고 All-Bond의 III군에서 $23.5{\pm}7.2kg$중의 순으로 나타났으며, I군이 II군과 III군에 대하여 통계학적인 유의성이 있었다(P<0.01). 세멘팅후 15일에 측정한 전단결합강도는 II군이 $34.6{\pm}10.4kg$중, I군에서 $23.1{\pm}8.7kg$중, 그리고 III군에서 $10.9{\pm}7.2kg$중으로 II군이 I과 III군에 대해, I군은 III군에 대해 통계학적 유의성이 있었다(P<0.01) 세민팅후 30일에 측정한 전달결합강도는 II군에서 $33.0{\pm}12.9kg$중, I군에서 $31.0{\pm}8.6kg$중, 그리고 III군에서 $13.6{\pm}6.6kg$중으로 II군과 I군이 III군에 대해 통계학적인 유의성이 있었다(p<0.01). 저장기간에 따른 전달결합강도 비교에서 III군에서 1일에서의 전단결합강도가 15일과 30일에서의 전단결합강도보다 통계학적으로 유의성 있게 높았다(P<0.01).

The purpose of this study was to compare the shear bond strength of adhesion bridge by various resin cements. One hundred and foully 1st premolars were used. The teeth were cut below 2mm from CEJ and the coronal portions were used. The coronal portions were embeded with the acrylic resin and trimmed with sic paper until the flat plane with ${\phi}$ 4mm above acrylic resin sticks in height 5mm were casted with nonprecious metal and the using surfaces were treated with sic paper from #200 to #1200 and polished with alminum oxide paste. And then, the using surfaces were sandblasted and treated with the electrochemical etching. The teeth were divided into three groups of fourty two each. In group I, teeth and specimens were cemented with Panavia 21 In group II, teeth and specimens were cemented with Superbond In group I, teeth and specimens were cemented with All-Bond & composite resin cement Each group was subdivided into three subgroups according to the storage period ; one-day storage, fifteen-day storage, and thirty-day storage. The special jig was made. Then, the specimen and jig were mounted to Instron Universal Testing Machine and the failure were measured. The results were as follows. 1. There was statisfically significant difference between the failure loads of group I and group II and III after one day storage(P<0.01), 2. There was statisfically significant difference between the failure loads of group II and group I and III and between group I and group III at fifteen day storage(P<0.01). 3. There was statisfically significant difference between the failure loads of group I and II and group III after thirty day storage(P<0.01). 4. There was statisfically significant difference between the failure loads of one day storage and fifteen and thirty days storages in group III (P<0.01).