AN EXPERIMENTAL STUDY ON THE BONDING STRENGTH OF COMPOSITE RESINS TO ETCHED ENAMEL SURFACE WITH PHOSPHORIC ACID

산처리(酸處理)된 치아표면(齒牙表面)에 대(對)한 복합(複合)레진 접착강도(接着强度)에 관(關)한 실험적(實驗的) 연구(硏究)

This experimental study was made to investigate the tensile strength of composite resins to etched enamel surface with a 50% phosphoric acid. Recently extraced 40 maxillary incisors were chosen. These were divied into 4 groups: Group I: Restodent adaptation to the etched enamel surface with 50% phosphoric acid. Group II: Restodent adaptation to only the ground enamel surface. Group III: Hi-pol adaptation to the etched enamel surface with 50% phosphoric acid. Group IV: Hi-pol adaptation to only the ground enamel surface. The results were as follows: 1. The tensile strength of Hi-pol showed much better results than that of Restodent. 2. Hi-pol and Restodent on the ground enamel surfaces showed little difference. 3. Adhesion to enamel increased on the average over 200% after a 50% phosphoric acid etch.