FRACTURE STRENGTHS OF CEROMER CROWNS SUPPORTED ON THE VARIOUS ABUTMENT CORE MATERIALS
김영오, 박영준, 구철회, 양홍소,
소속 상세정보
김영오 ( Kim Young-Oh ) - 전남대학교 치과대학 치과보철학교실
박영준 ( Park Young-Jun ) - 전남대학교 치과대학 치과재료학교실
구철회 ( Ku Chul-Whoi ) - 전남대학교 치과대학 치과보철학교실
양홍소 ( Yang Hong-So ) - 전남대학교 치과대학 치과보철학교실
KMID : 0362420040420060647
Abstract
Statement of problem. The effects of various core buildup materials which differs in the mechanical properties on the fracture strength of metal-free crowns is unknown.
Purpose. This study was carried out to evaluate the fracture strengths of Artglass ceromer crowns supported by 3 different core materials in clinically simulated anterior tooth preparation.
Material and methods. Ten crowns from each group were constructed to comparable dimensions on the various dies made by gold alloy, Ni-Cr alloy, and composite resin. The ten crowns were then cemented onto the dies and loaded until catastrophic failure took place. Fracture resistance to forces applied to the incisal edges of the anterior crowns supported by three types of dies was tested.
Results. The ceromer crowns on the composite resin dies fractured at significantly lower values(287.7 N) than the ceromer crowns on the metal dies(approximately 518.4 N). No significant difference was found between the fracture values of the ceromer crowns on the dies of gold alloy and Ni-Cr alloy.
Conclusion. The failure loads of the ceromer crowns on the metal dies were almost the same and not affected by the differences of casting alloys. However, the fracture values of the ceromer crowns on the resin dies were significantly reduced by the relative weak properties of composite resin core material.
키워드
Ceromer;Fracture strength;Resin cement;Metal die;Composite die
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