최소침습적 복합레진 수복을 위한 레진침투법의 활용
Utilization of Resin Infiltration for the Minimally Invasive Composite Restoration
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초록
와동 형성이 시작된 우식병소에는 병소 본체 주변으로 탈회가 진행 중인 초기 병소가 혼재한다. 이 연구에서는 법랑질에 국한된 우식 와동을 복합레진으로 수복 시 레진침투법을 병행하는 기법이 치질 보존 측면에서 의미를 갖는지를 평가하고자 하였다. 인접면 우식병소가 있는 탈락된 유구치를 이용, 레진침투(I, Infiltration), 치아삭제(P, preparation), 복합레진 수복(F, filling)의 적용 순서를 달리하여 IPF군과 PFI군으로 나누었다. 수복 범위, 레진침투 양상, 변연부 미세누출의 관점에서 수복물을 평가하였다. 치질 삭제범위는 수복 전후에 micro-CT를 이용하여 평가하였고, 두 실험군 모두에서 치료 전 병소의 크기보다 복합레진 수복물의크기가 작았다. 공초점 레이저 주사현미경을 이용한 레진침투 양상 평가 결과 두 실험군 모두 복합레진 수복물 주변에서 침투레진이확인되었으며, 인공 탈회 유발 후에도 침투레진은 대부분 유지되었다. 수복물 변연부 미세누출은 micro-CT로 확인하였고, PFI군에서더 빈번하게 확인되었다. 복합레진 수복과 레진침투법의 병용은 치질 보존 측면에서 의미를 가지며, 접착 향상을 위하여 레진침투-와동 형성-복합레진 수복의 순으로 진행하는 것이 추천된다.
Abstract
This study was aimed to assess the new trial for minimal cavity preparation in composite restoration combined with resin infiltration, focusing at application sequence. 32 human primary molars with early carious lesions around small cavity were selected and randomly divided into two groups, according to the sequence of cavity preparation (P), composite filling (F) and resin infiltration (I) as IPF and PFI group. Each group was assessed about amount of tooth reduction, features of resin infiltration, and marginal leakage around restoration. Amount of tooth reduction evaluated using micro-CT was decreased compared with the original lesion size in both groups. Features of resin infiltration were verified under confocal laser scanning microscopy. In both groups, infiltrant resin was found on all around the composite and maintained in spite of extent of decalcification even after artificial caries induction. Marginal micro leakage assessed with silver nitrate immersion and micro-CT was found more frequently in PFI group. The technique combining resin infiltration and composite restoration might ensure better adhesion prognosis as applied by the sequence of resin infiltration, cavity preparation, and composite filling. This new trial was thought meaningful in minimizing the cavity size and contributing to minimal invasive dentistry.
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