의치상용 자가중합레진의 중합조건에 따른 파괴인성
Fracture toughness of self-curing denture base resins with different polymerizing conditions
정수양, 김지혜, 양병덕, 박주미, 송광엽,
소속 상세정보
정수양 ( Jeong Soo-Yang ) - 전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소
김지혜 ( Kim Ji-Hye ) - 전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소
양병덕 ( Yang Byung-Deok ) - 전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소
박주미 ( Park Ju-Mi ) - 전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소
송광엽 ( Song Kwang-Yeob ) - 전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소
KMID : 0362420050430010052
Abstract
Purpose: The intent of this study was to evaluate the effects of curing conditions on selfcuring denture base resins to find out proper condition in self-curing resin polymerization.
Materials & Methods: In this study, 3 commercial self-curing denture base resins are used: Vertex SC, Tokuso Rebase and Jet Denture Repair Acrylic. After mixing the self curing resin, it was placed in a stainless steel mold(3x6x60mm). The mold containing the resin was placed under the following conditions- in air at 23 degrees C, or in water at 23degrees C; or in water at 23degrees C under pressure(20psi); or in water at 37degrees C under pressure(20psi); or in water at 50degrees C under pressure(20psi); or in water at 65degrees C under pressure(20psi), respectively. Also heatcuring denture base resin is polymerized according to manufacturers’ instructions as control. Fracture toughness was measured by a single edge notched beam(SENB) method. Notch about 3mm deep was carved at the center of the long axis of the specimen using a dental diamond disk driven by a dental micro engine. The flexural test was carried out at a crosshead speed 0.5mm/min and fracture surface were observed under measuring microscope.
Results & Conclusion: The results obtained were summarized as follows : 1. The fracture toughness value of self-curing denture base resins were relatively lower than that of heat-curing denture base resin. 2. In Vertex SC and Jet Denture Repair Acrylic, higher fracture toughness value was observed in the curing environment with pressure but in Tokuso Rebase, low fracture toughness value was observed but there was no statistical difference. 3. Higher fracture toughness value was observed in the curing environment with water than air but there was no statistical difference. 4. Raising the temperature in water showed the increase of fracture toughness.
키워드
self-curing denture base resin;Curing conditions;Fracture toughness
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