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Er:YAG 레이저를 조사한 유치 상아질의 전단결합강도에 관한 연구

A study of shear bond strength of Er:YAG laser-irradiated primary dentin

유승훈|김종수|이진화
대한소아치과학회 (The Korean Academy Of Pediatric Dentistry)|2007.11|대한소아치과학회지 (Journal of the Korean academy of pediatric dentistry)|제34권 제4호|pp. 569-578

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키워드

Shear bond strength전단결합강도Er:YAG laserDentin bonding systemEr:YAG 레이저유치 상아질상아질 접착 시스템Primary teeth dentin
주제분류치의학

초록

본 연구는 자가 부식과 two-bottle system에 의한 레진 부착시 레이저와 일반 고속 핸드피스에 의한 치아형성 관계를 규명해보고자 하였다. 55개의 유치를 발거한 후 레진에 매몰하여 상아질을 노출시켜 시편을 준비하였고 다음과 같이 분류하였다. Ⅰ군은 고속핸드피스로 치아 형성 후 AdperTM PromptTM L-PopTM(3M Unitek, USA)을, Ⅱ군은 Er:YAG 레이저로 치아 형성 후 AdperTM PromptTM L-PopTM(3M Unitek, USA)을, Ⅲ군은 레이저로 형성 후 산부식과 AdperTM Single Bond Plus Adhesive(3M Unitek, USA)를, Ⅳ군은 레이저로 형성 후 산부식 없이 AdperTM Single Bond Plus Adhesive(3M Unitek, USA)를 적용하였고 Ⅴ군은 고속 핸드피스로 치아 형성 후 산부식과 AdperTM Single Bond Plus Adhesive(3M Unitek, USA)를 적용하였다. 레진 FiltekTM Z250(3M Unitek, USA)을 직경 1.5 mm, 길이 3 mm의 투명관에 충전 후 적용하였다. 각 그룹 시편의 전단강도를 측정하였고 레이저와 고속 핸드피스로 치아 형성 후와 각각 산부식을 한 후 주사전자 현미경으로 관찰한 결과 다음과 같은 결론을 얻었다. 1. 기존 방법인 고속 핸드피스를 이용한 치아 형성 후 산부식과 AdperTM Single Bond를 이용한 방법이 가장 높은 결합 강도를 보였다. 2. 레이저를 이용한 치아 형성 후 산부식을 하지 않고 AdperTM Single Bond를 이용한 방법은 가장 낮은 결합 강도를 보였다. 3. 고속 핸드피스를 이용한 치아 형성 후 PromptTM L-PopTM을 이용한 레진 부착을 한 그룹과 레이저를 이용해 치아를 형성한 이후 산부식과 AdperTM Single Bond를 이용한 방법간의 결합 강도는 유의한 차이를 나타내지 않았다. 4. 레이저를 이용한 치아 형성 후 PromptTM L-PopTM을 이용한 Ⅱ군은 Ⅰ, Ⅲ, Ⅴ군에 비해서는 결합강도가 낮았으나 Ⅳ군에 비해서는 결합강도가 유의성 있게 높았다. 5. 주사전자 현미경 관찰시 레이저로 치아 형성한 상아질 표면은 불규칙한 표면이 두드러졌으며 도말층이 제거되었음을 볼 수 있었고 산부식 후에는 불규칙한 부위가 줄어들고 상아세관이 커짐을 확인했다.

Abstract

This study was performed to compare the shear bond strength of self etching system and two bottle bonding system with or without laser preparation. Group Ⅰ was prepared with high speed rotary instrument and PromptTM L-PopTM, group Ⅱ with Er:YAG laser and PromptTM L-PopTM, group Ⅲ with Er:YAG laser, 37% phosphoric acid and Single bond, group Ⅳ with Er:YAG laser and Single bond and group Ⅴ with high speed, etching and Single bond. And also observation of the prepared and etched dentin surface were performed under scanning electro-microscope. The possibility of clinical application of laser preparation which might have an advantage to reduce pain for children with less unfavorable noise were evaluated. The results obtained are as follows; 1. Group Ⅴ showed significantly higher bond strength than other groups. And group Ⅳ showed significantly lower bond strength than other groups. 2. There was no significant difference between group Ⅰ and group Ⅲ. 3. Group Ⅱ showed significantly lower bond strength than group Ⅰ, Ⅲ, Ⅴ, but showed significantly higher bond strength than group Ⅳ. 4. Under scanning electro-microscope, laser-preparated dentin surface showed high irregularity and no smear layer. The surface showed less irregularities and more exposed dentinal tubules with etching. Laser preparation has many advantages over conventional tooth preparation. But this method showed lower resin bonding strength. Laser preparated tooth surface differed from the conventionally preparated tooth surface. More researches are needed on suitable methods for laser preparated dentin surface.

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