[논문]5급 복합레진수복물의 응력분포에 관한 3차원 유한요소법적 연구

박정길; 허복; 김성교

doi:10.5395/jkacd.2008.33.1.028

5급 복합레진수복물의 응력분포에 관한 3차원 유한요소법적 연구
Stress distribution of Class V composite resin restorations: A three-dimensional finite element study 원문보기

大韓齒科保存學會誌 = Journal of Korean Academy of Operative Dentistry, v.33 no.1, 2008년, pp.28 - 38

박정길 (부산대학교 치의학전문대학원 치과보존학교실) , 허복 (부산대학교 치의학전문대학원 치과보존학교실) , 김성교 (경북대학교 치의학전문대학원 치과보존학교실)

초록
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본 연구는 3차원 유한요소 분석법적 연구를 통해 쐐기형 비우식성 치경부병소의 복합레진 수복물에서 다른 탄성계수를 가진 복합레진의 수복과 와동의 형태와 응력의 방향에 따른 응력분포의 영향에 대해 알아보고자 하였다. 발거된 상악 제2소구치를 Micro-CT로 스캔한 후 3D-DOCTOR로 3차원유한요소 모형을 제작하였다. 제작된 소구치 모형에 쐐기형 와동과 변형시킨 와동을 형성하고 각 와동을 탄성계수가 서로 다른 혼합형 복합레진 또는 흐름성 복합레진으로 수복하였다. 수복 전, 후 협측교두와 설측교두에 500N의 하중을 가한 후 응력분포를 ANSYS 프로그램을 이용하여 주 응력 분석법으로 평가한 바 다음과 같은 결과를 얻었다. 1. 수복 전 응력은 근심측 백악법랑경계와 와동저 선각부에 집중되었으며 최대응력은 근심협측우각부에서 나타났다. 2. 와동수복 후 와동저 선각의 응력은 현저히 감소했으나 치경부측 변연의 응력은 수복전보다 증가하였다. 3. 쐐기형태의 병소의 수복 시 와동저 선각부는 탄성계수가 높은 재료가 유리하고 치경부측 변연은 탄성계수가 낮은 재료가 유리하였다. 4. 와동저 선각부를 둥글게 변화시키는 것은 압축응력은 감소시키지 않으나 인장응력은 감소시켰다.

Abstract ▼ AI-Helper

This study was to investigate the influence of composite resins with different elastic modulus, cavity modification and occlusal loading condition on the stress distribution of restored notch-shaped noncarious cervical lesion using 3-dimensional (3D) finite element (FE) analysis. The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. A notch-shaped cavity and a modified cavity with a rounded apex were modeled. Unmodified and modified cavities were filled with hybrid or flowable resin. After restoration, a static load of 500N was applied in a point-load condition at buccal cusp and palatal cusp. The stress data were analyzed using analysis of principal stress. The results were as follows: 1. In the unrestored cavity, the stresses were highly concentrated at mesial CEJ and lesion apex and the peak stress was observed at the mesial point angle under both loading conditions. 2. After restoration of the cavity, stresses were significantly reduced at the lesion apex, however cervical cavosurface margin, stresses were more increased than before restoration under both loading conditions. 3. When restoring the notch-shaped lesion, material with high elastic modulus worked well at the lesion apex and material with low elastic modulus worked well at the cervical cavosurface margin. 4. Cavity modification the rounding apex did not reduce compressive stress, but tensile stress was reduced.

주제어

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가설 설정

In the cervical cavosurface margin, Tetric Flow restoration showed a smaller stress value compared with Z100. It was hypothesized that Z100 composites used as a strut would improve the reduction rates of stress in the apex. This hypothesis was based on earlier studies231 showing that restoration using Z100 worked as a strut to prevent stress concentration of the lesion.

제안 방법

The extracted premolar was scanned serially with Micro-CT (SkyScanlO₇₂; SkyScan, Aartselaar, Belgium) to expose the tooth sections perpendicular to the long axis of the tooth (58 i in thickness) and parallel to the occlusal plane. Image processing software, 3D-DOCTOR (Able Software Co., Lexington, MA, USA), was employed to make the boundaries of enamel, dentin and pulp and to construct a surface model of tooth from the sectioned two dimensional images. ANSYS (Swanson Analysis Systems, Inc.
The extracted premolar was scanned serially with Micro-CT (SkyScanlO₇₂; SkyScan, Aartselaar, Belgium) to expose the tooth sections perpendicular to the long axis of the tooth (58 i in thickness) and parallel to the occlusal plane. Image processing software, 3D-DOCTOR (Able Software Co.
Under Load A, minimum principal stress was analyzed and under load B maximum principal stress was analyzed. The principal stresses of five nodes {Mesial point angle (MP), Mesial node (Mes), Middle node (Mid), Distal node (Dist), Distal point angle (DP)} in the lesion apex, and cavosurface margin of cervical wall were analyzed using ANSYS. At the initial pilot study, after the cavity was restored with composite resin, the peak stress was moved to more mesial proximal node than MP.
The purpose of this study was to investigate the influence of composite resins with different elastic modulus, cavity modification and occlusal loading condition on the stress distribution of the restored notch-shaped NCCL using 3D FE analysis.
To develop a 3D FE model, an intact normal extracted human maxillary second premolar was used. The extracted premolar was scanned serially with Micro-CT (SkyScanlO₇₂; SkyScan, Aartselaar, Belgium) to expose the tooth sections perpendicular to the long axis of the tooth (58 i in thickness) and parallel to the occlusal plane.

대상 데이터

668 elements with 18, 245 nodes. A notchshaped lesion with a 4.28 mm vertical height and a 5.31 mm mesiodistal width was modeled. The modified notch model was the same shaped lesion except for the rounded lesion apex (Figure 1).
In this study, the final model consisted of 16, 668 elements with 18, 245 nodes. A notchshaped lesion with a 4.

이론/모형

, Lexington, MA, USA), was employed to make the boundaries of enamel, dentin and pulp and to construct a surface model of tooth from the sectioned two dimensional images. ANSYS (Swanson Analysis Systems, Inc., Houston, USA) was used to mesh and analyze 3D FE model.

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