유한요소법을 이용한 전부주조관의 교합점 위치와 하중방향이 시멘트층 내 응력에 미치는 영향
Characterization of the Stresses in the Luting Cement Layer Affected by Location of the Occlusal Points and Loading Direction on a Full Veneer Crown
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초록
이 논문의 목적은 전부주조관에서 교합점의 위치와 교합력의 방향이 합착용 시멘트층 내의 응력에 미치는 영향에 대해서 알아보는 것이다. 하악 제 1대구치상에서 서로 다른 9 개의 교합점과 3가지 교합력 방향을 가진 27가지 조합의 유한요소 모델을 상정하였다. 금관의 소재는 제 3형 금합금이고, 변연의 형태는 chamfer이다. 합착용 시멘트로는 전 층에서 균일하게 70 μm의 두께를 가지는 글라스 아이오노머 시멘트가 사용되었다. 금관에는 100N의 하중을 적용하였다. 협측과 설측 변연의 근접도에 따라서 시멘트층 내 응력은 다른 양상을 나타내었다. 협측은 변연으로부터 약 0.5 mm, 설측은 변연으로부터 약 1 mm 내측에서 최대 응력 값을 가졌다. 하중 방향이 치축에 대해 경사가 클수록, 하중점이 교두첨에 근접해 있을수록 더 큰 응력이 발생하였다.
Abstract
The objective of this study was to test effects of (1) where the occlusal contact points locate on a full veneer crown, and (2) which direction the contact forces are directed to, on the stresses within the luting cement layer that might suffer microfracture. A total of 27 finite element models were created for a mandibular first molar, combining 9 different locations of the occlusal contact points and 3 different loading directions. Type 3 gold alloy was used for crown material with a chamfer margin, and the luting cement material was glass ionomer cements in uniform thickness of 75 μm. Modeled crowns were loaded at 100 N. Different patterns in the cement stress were observed in the vicinity of the buccal and lingual margins. Whereas, the peak stress in buccal margin occurred approximately 0.5 mm away from the external surface, the highest stress in lingual margin was observed at approximately 1 mm. Significantly different distribution of stresses was recorded as a function either of the location of the occlusal contact points or of the loading direction. Higher stresses were produced by more obliquely acting load, and when the loaded point was in the vicinity of the cusp tip.
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