Stress distribution of molars restored with minimal invasive and conventional technique: a 3-D finite element analysis
양선미, 김선미, 최남기, 김재환, 양성표, 양홍소,
소속 상세정보
양선미 ( Yang Sun-Mi ) - Chonnam National University School of Dentistry Department of Pedodontics
김선미 ( Kim Seon-Mi ) - Chonnam National University School of Dentistry Department of Pedodontics
최남기 ( Choi Nam-Ki ) - Chonnam National University School of Dentistry Department of Pedodontics
김재환 ( Kim Jae-Hwan ) - Chonnam National University School of Dentistry Department of Pedodontics
양성표 ( Yang Sung-Pyo ) - KAIST Department of Bio and Brain Engineering
양홍소 ( Yang Hong-So ) - Chonnam National University School of Dentistry Department of Prosthodontics
Abstract
Purpose: This study aimed to analyze stress distribution and maximum von Mises stress generated in intracoronal restorations and in tooth structures of mandibular molars with various types of cavity designs and materials.
Materials and Methods: Threedimensional solid models of mandible molar such as O inlay cavity with composite and gold (OR-C, OG-C), MO inlay cavity with composite and gold (MR-C, MG-C), and minimal invasive cavity on occlusal and proximal surfaces (OR-M, MR-M) were designed. To simulate masticatory force, static axial load with total force of 200 N was applied on the tooth at 10 occlusal contact points. A finite element analysis was performed to predict stress distribution generated by occlusal loading.
Results: Restorations with minimal cavity design generated significantly lower values of von Mises stress (OR-M model: 26.8 MPa; MR-M model: 72.7 MPa) compared to those with conventional cavity design (341.9 MPa to 397.2 MPa). In tooth structure, magnitudes of maximum von Mises stresses were similar among models with conventional design (372.8 - 412.9 MPa) and models with minimal cavity design (361.1 - 384.4 MPa).
Conclusion: Minimal invasive models generated smaller maximum von Mises stresses within restorations. Within the enamel, similar maximum von Mises stresses were observed for models with minimal cavity design and those with conventional design.
키워드
finite element analysis; inlay; minimal cavity design; stress; composite
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