Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)

Korean Academy of Pediatric Dentistry (대한소아치과학회)
권호 표지

CHANGES OF COMPRESSIVE STRENGTH AND MICROHARDNESS OF COMPOSITE RESIN, GIOMER AND COMPOMER AFTER THERMOCYCLING TREATMENT

복합레진, 자이오머, 컴포머의 열순환 후 압축강도와 미세경도의 변화

  • Yoon, Mi (Department of Pediatric Dentistry, Dental College, Dankook University) ;
  • Kim, Jong-Soo (Department of Pediatric Dentistry, Dental College, Dankook University) ;
  • Yoo, Seung-Hoon (Department of Pediatric Dentistry, Dental College, Dankook University)
  • 윤미 (단국대학교 치과대학 소아치과학교실) ;
  • 김종수 (단국대학교 치과대학 소아치과학교실) ;
  • 유승훈 (단국대학교 치과대학 소아치과학교실)
  • Received : 2010.08.30
  • Accepted : 2010.11.18
  • Published : 2010.11.30
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Abstract

Giomer is a recently developed light-cured resin-based material. This study compared compressive strength and microhardness of composite resin, giomer and compomer after 5000 times of thermocycling at $5^{\circ}C$ and $55^{\circ}C$. The following results were obtained. 1. Composite resin resulted in the highest compressive strengths both before and after thermocycling, followed by giomer and compomer. There were statistically significant differences between composite resin and giomer/compomer (p<0.05), but no statistically significant differences between giomer and compomer. 2. Both before and after thermocycling, microhardness values appeared in the order of composite resin, giomer and compomer with statistically significant differences in microhardness of composite resin, giomer and compomer (p<0.05). 3. After thermocycling, microhardness of composite resin, giomer and compomer decreased with a statistically significant difference (p<0.05). In conclusion, giomer demonstrates higher microhardness than compomer, but lower compressive strength and microhardness than composite resin. In addition, the decrease in microhardness and compressive strength after thermocycling proves the necessity for a thorough understanding in mechanical properties of restoration materials prior to their clinical application.

자이오머는 불소를 유리하는 최근 개발된 광중합 레진 제재이다. 본 실험에서는 복합레진, 자이오머, 컴포머를 이용하여 $5^{\circ}C$와 $55^{\circ}C$에서 5000번 열순환 후 압축강도와 미세경도 변화를 비교 평가하였다. 1. 열순환 전.후 모두 압축강도는 복합레진이 가장 높았으며, 자이오머, 컴포머 순으로 낮아졌다. 복합레진은 자이오머, 컴포머와 통계학적으로 유의차를 보였고(p<0.05), 자이오머와 컴포머 사이에는 유의차가 없었다. 2. 열순환 전.후 미세경도는 복합 레진, 자이오머, 컴포머 순으로 낮아졌으며, 각각 통계학적으로 유의차를 보였다(p<0.05). 3. 복합레진, 자이오머, 컴포머는 열순환 후 통계학적으로 유의하게 미세경도가 감소하였다(p<0.05). 이상의 결과를 종합해보면, 자이오머는 컴포머보다 높은 미세경도를 보이지만, 복합레진보다 낮은 압축강도와 미세경도를 보인다. 열순환 후 미세경도가 감소하므로 임상적 사용시 물리적 성질에 대한 충분한 고찰이 필요할 것으로 사료된다.

Keywords

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