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

Yoon, Mi; Kim, Jong-Soo; Yoo, Seung-Hoon

Journal of the Korean Academy of Pediatric Dentistry 2010;37(4):438-444.
Published online November 30, 2010.

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

Mi Yoon, Jong-Soo Kim, Seung-Hoon Yoo

Department of Pediatric Dentistry, Dental College, Dankook University

복합레진, 자이오머, 컴포머의 열순환 후 압축강도와 미세경도의 변화

윤미, 김종수, 유승훈

단국대학교 치과대학 소아치과학교실

Correspondence: Jong-Soo Kim, Tel: 041-550-1935, Email: jskim@dku.edu

Received: 30 August 2010 • Accepted: 18 November 2010

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℃ and 55℃. 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.

Key Words: Giomer, Thermocycling, Microhardness, Compressive strength