하악에 식립된 짧은 임플란트 주위 수평으로 흡수된 골에서의 유한요소 응력분석

Abstract

Objectives: In the mandibular molar region, it is often difficult to place a standard implant due to the inferior alveolar nerve, so it is necessary to consider placing a short implant. Horizontal bone loss occurs even in a stable standard implant, which changes the stress distribution in the supporting bone around the implant. This study was performed to confirm the effect of the stress distribution on short implant supporting bone according to horizontal bone loss using a three-dimensional finite element stress analysis.

Materials and methods: A three-dimensional finite element model was designed by placing a short implant in a jaw model with a 2 mm - thickness cortical bone. Horizontal bone loss was applied at 1 mm intervals from 0 to 3 mm, and a load of 400N was applied to the center of the occlusal surface parallel to the long axis to calculate the maximum principal stress generated in the short implant supporting bone.

Results: As a result of finite element analysis, the maximum principal stresses according to horizontal bone loss from 1 mm to 3 mm in cortical bone were 45.13, 79.44 and 75.53 (MPa), respectively. The maximum principal stresses according to horizontal bone loss from 1 mm to 3 mm in the cancellous bone were 7.63, 9.28 and 9.60 (MPa), respectively.

Conclusions: Within the limitations of this study, it is possible to conclude that horizontal bone loss of 2 mm or more may lead to an increase in the stress distribution in short implant supporting bone, especially in the cortical bone.