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냉각속도가 지르코니아-도재 수복물의 전장도재 내 잔류응력에 미치는 효과에 관한 문헌고찰

The effet of cooling rate on the residual stresses in the veneer ceramics of zirconia-ceramic restorations: a literature review

김선재|장재승
대한치과보철학회 (The Korean Academy Of Prosthodontics)|2014.04|대한치과보철학회지 (The Journal of Korean Academy of Prosthodontics)|제52권 제2호|pp. 136-142|DOI https://doi.org/10.4047/jkap.2014.52.2.136

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키워드

Residual stressZirconia파절잔류응력지르코니아전장도재냉각속도Veneer ceramicChippingCooling rate
주제분류치의학

초록

최근 많이 이용되고 있는 지르코니아-도재 수복물은 그 적용범위가 점차로 증가하고 있다. 임상연구결과에서 지르코니아 코어는 매우 높은 성공율을 보이고 있으나 코어 위에 축성되는 전장도재는 기존에 이용되어온 금속-도재 수복물에 비해 높은 파절빈도를 나타내고 있다. 이러한 파절의원인으로 여러가지 요소가 거론되고 있으나 아직 명확하게 설명하고 있지는 못하다. 최근 전장도재 축성 후 냉각과정에서 잔존하는 잔류응력이전장도재의 파절에 영향을 미칠 수 있다는 연구결과가 속속 발표되고 있다. 본 고찰에서는 잔류응력이 무엇이며 도재 축성 후 냉각과정에서 어떤 기전을 통해 전장도재 내에 잔류응력이 발생하는지, 또한 기존의 금속-도재 수복물에서 발생하는 잔류응력과는 어떤 차이가 있는지 문헌고찰을 통해 살펴보고자 한다.

Abstract

Nowadays, dental zirconia is widely used as a framework material for a fixed dental prosthesis as well as a single restoration. However, clinical studies have reported high incidence of veneer chipping of zirconia-ceramic restorations compared to that of metal-ceramics. Several factors were raised as the possible causes of veneer ceramic chipping, however, it is still in debate. Recently, residual stresses in the veneer ceramics after cooling process gathers attention as one possible cause of chipping and many studies reported that the rate of cooling significantly influenced the types and the amount of residual stress. The purpose of current review was to briefly describe the effect of cooling rate on the residual stress in zirconia-ceramics. It was also described that the different behavior of residual stress between zirconia-ceramics and metal-ceramics following different cooling rate.

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