치주 지지가 감소된 소구치에서 포스트가 치근 응력 분포에 미치는 영향에 대한 3차원 유한요소법적 연구 = STRESS DISTRIBUTION OF PERIODONTALLY INVOLVED TEETH RESTORED WITH VAR10US POSTS -THREE-DIMENSIONAL FINITE ELEMENT STUDY-

다국어 초록 (Multilingual 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.

참고문헌 (Reference)

• 1 "Three-dimensional photoelastic stressanalysis of the ferrule effect in cast post andcores" 506-512,
• 2 "The prosthodonticmanagement of endodontically treatedteeth" 243-250, jprosthodont1994;3
• 3 "The effects of dowel design and loaddirection on dowel-and-core restorations" 85 : 558-567, 2001
• 4 "Rootstresses with tapered-end post design inperiodontally compromised teeth" 281-286, jprosthetdent1987;57
• 5 "Post-core foun-dations for endodontically treated poste-rior teeth" 401-406,
• 6 "Photoelastic analysis of stress transferby endodontically treated teeth to thesupporting structure using different restora-tive techniques" 535-543,
• 7 "Mechanical properties of endodontic posts" 24 : 882-887, 1997
• 8 "In vitro comparison of dowel andcore techniques for endodontically treatedmolars" 382-387, jendod1986;12
• 9 "Dete-rmination of stress patterns in root-filledteeth incorporating various dowel de-signs" 1301-1310,
• 10 "Dentin stresses in post-reconstructedteeth with diminishing bone support" 1002-1008, jdentres1983;62
• 11 "Anamalgam coronal-radicular dowel and coretechnique for endodontically treated pos-terior teeth" 511-515,
• 12 "Analysisof stress distribution in a maxillary centralincisor subjected to various post and coreapplications" 24 : 107-111, 1998
• 13 "Analysis of stress distributionby endodontic posts" 952-960, oralsurgoralmedoralpathol1972;33
• 14 "An eval-uation of root resections" 719-722, jperiodontol1981;52
• 15 "A survey of the fixedrestorations" 359-367, jkoreanacadprosthodont1994;32
• 16 "A nationwide survey of contem-porary philosophies and techniques ofrestoring endodontically treated teeth" 259-267,
• 17 "A longitudinal studyof combined periodontal and prosthetictreatment of patients with advanced pe-riodontal disease" 163-169, jperiodontol1979;50
• 18 "A comparativestudy of restorative techniques for pulplessteeth" 405-412,
• 19 "A comparative eval-uation of three post and core techniques" 177-181,
• 20 "A com-parison of intracanal stresses in a post-re-stored tooth utilizing the finite elementmethod" 540-544, jendod1992;18