전부피개관의 물성과 시멘트의 물성이 시멘트 내부의 응력에 미치는 영향
Characterization of the Stress in the Luting Cement layer Influenced by Material Properties of Full Veneer Crown
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이 논문의 목적은 시멘트 층 내의 응력분포에 대해 금관의 물성과 시멘트의 물성 및 교합력의 방향이 미치는 영향을 이차원 유한요소분석으로 조사하는 것이다. Chamfer 변연을 가지는 23개의 하악 제1대구치 모델을 상정하였다. 금관의 재질은 제 3형 금합금, Ni-Cr 합금, 세라믹, 복합레진 등 4가지이며, 시멘트의 재질은 인산 아연 시멘트와 글라스 아이오노머 시멘트 등 2가지이다. 치축과 평행하게 또는 경사지게 하여 1N 단위로 금관에 하중을 가했다. 시멘트층의 응력은 금관 변연이 다른 곳보다 더 높았다. 치축에 평행한 하중이 치축에 경사진 하중보다 더 높은 응력을 발생시켰다. 경도가 더 큰 금관은 시멘트 층 내에서 더 높은 응력을 나타냈으며, 더 높은 응력은 더 큰 Young's modulus을 나타냈다.
Abstract
The objective of this study was to test the effects of crown material, cement type, the direction in which stress is applied and distribution of luting cement that might lead to cement microfracture using 2D Finite Element Method. Twenty three finite element models with a chamfer margin configuration were generated for a mandibular first molar. Crown models exhibited four crown materials: type 3 gold alloy, Ni-Cr alloy, ceramic and composite resin, and two luting cements: zinc phosphate and glass ionomer cements with a thicknesses of 70 μm. Modeled crowns were loaded axially or obliquely at unit load of 1 N. Areas and levels of stress concentrations within the cement were determined. Stress in the cement layer at the margins of crowns were higher than those in the area away from the margin. Stress under oblique loads were much higher than under axial load. The stiffer crown material produced higher stress and similarly, higher stress were found in cements with the greater Young's modulus.
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