우치에 대한 All-in-one 상아질 결합제의 전단결합강도 비교 연구 = STUDY ON THE SHEAR BOND STRENGTH OF ALL-IN-ONE DENTIN BONDING SYSTEM

다국어 초록 (Multilingual Abstract)

This study was performed to compare the shear bond strength of AQ Bond Plus {TM} with AQ Bond {TM} and Single Bond {TM}. Also by observing the fractured interface under scanning electro-microscope, the fracture pattern and the quality of hybrid layer were analyzed. The possibility of clinical application of all-in-one system which has an advantage to reduce chair time for children with difficult behavior pattern was evaluated, The results obtained are as follows ;
1. There was no significant difference between AQ Bond{TM} and AQ Bond Plus{TM} in shear bond strength and Single Bond showed the highest bond strength with statistical significant difference (p<0.05).
2. Adhesive fracture pattern was mainly observed in both enamel/dentin in AQ Bond {TM} and AQ Bond Plus {TM} group while Single Bond group showed equal numbers for cohesive and adhesive pattern.
3. Under scanning electro-microscope, resin tags observed in AQ Bond {TM} and AQ Bond Plus {TM} were very weak and tangled while strong and thick tags were shown with many lateral branches in Single Bond.
Careful case selection and accurate clinical application is recommended when using AQ Bond {TM} and AQ Bond Plus {TM}considering the result showing its weaker strength than Single Bond {TM}.

국문 초록 (Abstract)

우치 60개를 준비하여 법랑질과 상아질에 대하여 각각 1군 AQ Bond, 2군 AQ Bond Plus {TM}, 3군 Single Bond {TM}로 설정하고, 군당 10개씩 배정하였고, 군당 혼화층 관찰에 5개와 resin tag 관찰을 위해 5개씩 배정하였다. 준비된 우치의 법랑질과 상아질을 노출시킨 후 제조사의 지시에 따라 표면을 처리하고, 내경 3mm의 폴리에틸렌 튜브를 이용하여 Z-250 {TM} 복합레진 접착을 시행하였다. 100% 습윤 상태에서 24시간동안 보관 후 5 {circ}C와 55 {circ}C 조건하에서 500회 열순환을 시행하였다. 만능시험기를 분당 cross head speed 5mm 속도로 설정하고 100kg F load cell을 사용하여 전단결합강도를 측정하고 파절된 시편들을 수거하여 주사전자현미경으로 파절면을 관찰하였다.
혼화층과 resin tag 관찰을 위하여 상아질 접착면에 대해 수직으로 절단하고 인산과 질산으로 처리한 후 주사전자현미경으로 관찰하였다.
이상의 결과를 토대로 행동 조절에 어려움이 많은 소아 환자의 복합레진 수복시 적용 과정 및 시간 단축이 장점으로 부각되고 있는 all-in-one system의 임상 적용 가능성을 평가하고 다음과 같은 결론을 얻었다.
1. 전단 결합 강도 측정결과 1군, 2군 간에는 유의차가 없었으나, 3군이 1군과 2군에 비해 높은 전단 결합 강도를 보였으며 통계학적 유의차를 보였다 (p<0.05).
2. 파절 양상 관찰 결과 1군과 2군의 법랑질과 상아질 모두에서 그리고 3군의 상아질에서 주로 adhesive fracture 양상을 보였으며, 3군 법랑질에서 각각 cohesive와 adhesive fracture가 균등한 분포를 보였다.
3. 주사 전자 현미경 소견에서 1군과 2군은 resin tag형성이 매우 미약하고 불규칙한 양상을 보인 반면, 3군에서는 비교적 긴밀하게 형성된 resin tag이 관찰되었으며 resin tag의 표면에 형성된 뚜렷한 측부 가지들도 발견되었다.

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