Analysis of Strain Gage Method for Comparisons of Polymerization Shrinkage and Stress of Dental Restorative Composite Resins
안소연, 심연수, 김아현, 강일현,
소속 상세정보
안소연 ( An So-Youn ) - Wonkwang University College of Dentistry Department of Pediatric Dentistry
심연수 ( Shim Youn-Soo ) - Sunmoon University Department of Dental Hygiene
김아현 ( Kim Ah-Hyeon ) - Red Dental Research Institute
강일현 ( Kang Il-Hyun ) - Yonsei Hyun Dental Clinic
KMID : 1146620180070010019
Abstract
The aims of this study were to measure the linear polymerization shrinkage and microhardness of recently developed dental restorative composite resins and compare it with those of conventional methacrylate-based dental composite resins. Two methacrylate-based composites (Z100, Z350 flowable) and two recently developed composite (Venus® (Heraus, Germany), SDRTM (Densply, Germany)) were investigated. The polymerization shrinkage and stress of the composites during light curing was measured with the strain gage method and surface microhardness was measured with Micro Hardness Tester (JT Toshi Inc, Japan). The shrinkage of SDRTM was the lowest, and that of Z350 flowable was the highest. Peak polymerization shrinkage rate was the lowest in SDRTM and the highest in Z350 flowable. Among materials, Z100 showed significantly higher micro hardness than any other materials after curing (p<0.05). Micro hardness of SDR showed higher value than that of Venus, Z350 but no significant difference (p<0.05).
키워드
Composite resin; Dental material; Polymerization shrinkage; Strain gauge
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