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J Korean Acad Pediatr Dent. 2010;37(4): 438-444.
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
Corresponding Author: Jong-Soo Kim ,Tel: 041-550-1935, Email: jskim@dku.edu
Received: August 30, 2010;  Accepted: November 18, 2010.
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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℃ 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.
Keywords: Giomer | Thermocycling | Microhardness | Compressive strength
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