ヒトの歯に生じたくさび状欠損修復後の咬合により生じる特異応力場の強さ : コンポジットレジンの剛性の影響

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タイトル別名
  • Intensity of Singular Stress Field due to Wedge-Shaped Defect in Human Tooth after Restored with Composite Resins : Influence of the Stiffness of the Composite Resin
  • ヒト ノ ハ ニ ショウジタ クサビ ジョウ ケッソン シュウフク ゴ ノ コウゴウ ニ ヨリ ショウジル トクイ オウリョクバ ノ ツヨサ コンポジットレジン ノ ゴウセイ ノ エイキョウ

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抄録

Wedge-shaped defects are frequently observed on the cervical region of the human tooth. Previously, most studies explained that such defects are caused by improper toothbrushing. However, recent clinical observation suggested that the repeated stress originated from occlusal force may induce the formation of wedge-shaped defects. In this study, therefore, two-dimensional human tooth model after the wedge-shaped defect is restored with composite resin is analyzed by using the finite element method. To obtain the intensity of the singular stress accurately, a method of analysis is discussed for calculating generalized stress intensity factors, which control the singular stress around the tip of the defect. Finally, the relationships between the stress intensity and occlusion are discussed. It is found that large occlusal forces perpendicular to the tooth axis are harmful to the resin that is bonded to dentin.

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