歯冠材料による歯組織の生体力学的安定性の評価．三次元有限要素解析

Evaluation of Biomechanical Stability of Teeth Tissue According to Crown Materials: A Three-Dimensional Finite Element Analysis.

抄録

様々な歯冠材料による歯組織の生体力学的影響を有限要素解析により検討した．骨，支台歯，根管，歯根膜をコンピュータ断層撮影法に基づいてモデル化した．歯冠材料の特性により，ジルコニア，ハイブリッドセラミック，金合金，アクリルレジンに分類した．歯冠の咬合面に垂直方向に200Nの荷重を加え，すべての界面を結んだ状態で解析を行った．その結果，暫間補綴物であるアクリルレジン模型の作製歯が最も高いvon Mises応力を示し，歯髄圧も最も高かった．さらに，最終補綴物の中では，ハイブリッドセラミック模型の支台歯が最も高い応力を示した．修復材料の特性は歯質に影響を与える因子となりうる。したがって、修復治療用の材料を選択する際に正しい決定を下すためには、これらの修復材料の特性を理解し、分析し、評価することが必要である。

The biomechanical effects of dental tissue according to various dental crown materials were investigated using finite element analysis. Bone, prepared tooth, root canal, and periodontal ligament were modeled based on computed tomography. Depending on the characteristics of the crown material, it was classified into zirconia, hybrid ceramic, gold alloy, and acrylic resin. A loading force of 200 N was applied in the vertical direction to the occlusal surface of the crown, and analysis was performed under the condition that all interfaces were tied. The results demonstrate that the highest von Mises stress was shown in the prepared tooth of the acrylic resin model, which is a temporary prosthesis, and the pulpal pressure was also the highest. Additionally, among the final prosthesis, the highest stress was shown in the hybrid ceramic model prepared teeth. The properties of restoration materials can be a factor influencing the tooth structure. Thus, in order to make a correct decision when selecting a material for restorative treatment, it is necessary to understand, analyze, and evaluate the properties of these restoration materials.