The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

STRESS DISTRIBUTION OF PERIODONTALLY INVOLVED TEETH RESTORED WITH VAR10US POSTS -THREE-DIMENSIONAL FINITE ELEMENT STUDY-

치주 지지가 감소된 소구치에서 포스트가 치근 응력 분포에 미치는 영향에 대한 3차원 유한요소법적 연구

  • Jeong, Hye-Jin (Department of Dentistry, College of Medicine, Inha University) ;
  • Yoo, Jae-Heung (Department of Dentistry, College of Medicine, Inha University) ;
  • Oh, Nam-Sik (Department of Dentistry, College of Medicine, Inha University) ;
  • Kim, Han-Sung (Institute of Medical Engineering, Yonsei University)
  • 정혜진 (인하대학교 의과대학 치과학교실) ;
  • 유재흥 (인하대학교 의과대학 치과학교실) ;
  • 오남식 (인하대학교 의과대학 치과학교실) ;
  • 김한성 (연세대학교 보건과학대학 의공학부)
  • Published : 2007.10.31
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Abstract

Statement of problem: The endodontically treated tooth is generally restored with post and core, owing to the brittle and the loss of large amount of tooth structure. As periodontal treatment was developed, there are many cases that periodontally involved teeth used in prosthetic treatment. Purpose: The purpose of this study was to analyze the stress distribution in the dentin and post structures by the various post materials and the amount of remaining alveolar bone height. Material and method: The 3-dimensional finite element models of mandible 1st premolars were divided into six types according to the various amount of remaining alveolar bone and post type. All types were modeled using equal length, diameter and shape of the post. Three types of post and core materials were used: prefabricated titaniumpost and amalgam core, prefabricated stainless steel post and amalgam core, and cast gold post and core. 300 Newton force was applied to functional cusp of mandible 1st premolar. Results: The results were as follows: First, there was no apparent difference in the pattern of stress distribution according to the alveolar bone condition concentrate on the post middle area. Second, there was difference in pattern of stress distribution according to the core materials, gold post and core generated same than amalgam core. Third, there was no apparent difference in the pattern of stress distribution within the dentin according to the post and core materials. But a cast gold post and core generated the lowest maximum stress value, a stainless steel post generated the highest maximum stress value. Fourth, in the reduced alveolar bone model, maximum stress value is 1.5 times than that of the normal alveolar bone model. Conclusion: Within the limitations of this study, to provide minimal stress to the root with alveolar bone reduced, the post length may be as long as apical seal was not destroyed. To prevent fracture of tooth, it is rational to use gold alloy which material was good for stress distribution for post materials.

Keywords

References

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