법랑질의 산부식 처리가 자가부식 접착시스템의 접착에 미치는 영향

Abstract

The purpose of this study was to compare the microshear bond strengths (uSBS) of two adhesive systems (a total-etch and a self-etch) to ground and intact enamel and also to evaluate the effect of pre-etching when using a self-etch adhesive system. The labial surfaces of 24 extracted bovine incisors were used. For the ground enamel, flat enamel surfaces at labial aspect were ground. However, for intact enamel surfaces, the teeth were polished. The samples were divided into six groups according to ground (GE) or intact enamel (IE), adhesive systems (AdperTM Single Bond (ASB) or AdperTM Easy Bond (AEB)-3M ESPE Dental Products, Seefeld, Germany) and etched or no-etched enamel with 35% posphoric acid when using AEB; Group 1 : GE+ASB, Group 2 : GE+AEB, Group 3 : pre-etching of GE+AEB, Group 4 : IE+ASB, Group 5 : IE+AEB, Group 6 : pre-etching of IE+AEB. Eighteen ground and intact enamel surfaces were bonded with one of two adhesive systems and a flowable resin (FiltekTM Z 350) using Tygon tubes. Samples were subjected to a microshear bond test. Six ground and intact enamel surfaces were bonded with one of adhesive systems and a flowable resin, sectioned and observed under scanning electron microscopy. The results of this study were as follows; 1. The uSBS of group 1, 3, 4, 6 was significantly higher than that of group 2 and group 5 on ground and ntact enaeml, respectively ( p < 0.05). 2. There was significant difference between the uSBS of group 2 and group 5 ( p < 0.05). 3. Group 1, 3, 4, 6 showed the close adaptation at the interfaces of enamel and flowable resin, but group 2 and 5 showed big gaps at the interfaces.

It was concluded that a total-etch adhesive system demonstrated higher 𝜇SBS than did a one-step self-etch adhesive system on both of ground and intact enamel. Pre-etching enamel may improve the bond strength of a one-step self-etch adhesive system on both of ground or intact enamel.