Mechanics Analysis of Various Placements of Implant in Implant-supported Full Arch Fixed Prosthesis of Mandible

博士 === 國立臺灣科技大學 === 機械工程系 === 97 === The purpose of this study was to compare the effects of various designs of implants’ placement on stress distribution in bone around the implants supporting one-unit fixed prosthesis. A computer tomography image was redrawn to reconstruct a digital three-dimensio...

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Main Authors: Yuan-shou Jiang, 江元壽
Other Authors: Chwei-goong Tseng
Format: Others
Language:zh-TW
Published: 2008
Online Access:http://ndltd.ncl.edu.tw/handle/43374661625497711331
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spelling ndltd-TW-097NTUS54890062015-10-13T14:49:22Z http://ndltd.ncl.edu.tw/handle/43374661625497711331 Mechanics Analysis of Various Placements of Implant in Implant-supported Full Arch Fixed Prosthesis of Mandible 下顎骨植體膺復固定式全口牙橋不同植體佈置之力學分析 Yuan-shou Jiang 江元壽 博士 國立臺灣科技大學 機械工程系 97 The purpose of this study was to compare the effects of various designs of implants’ placement on stress distribution in bone around the implants supporting one-unit fixed prosthesis. A computer tomography image was redrawn to reconstruct a digital three-dimensional solid model of a mandible including the cortical bone and cancellous bone. Moreover, the reverse engineering method and computer-aided design were employed to construct fourteen pieces of digital three-dimensional solid model of teeth including the anterior and posterior regions as well as implant and abutment. Each tooth was cut along the cervical line to obtain the crown, and all of the crowns were connected by using the MSC/PATRAN software and called the fixed prosthesis. All of the digital three-dimensional solid models were combined and transformed to the FE models by using the MSC/PATRAN software, and they were classified into 27 configurations according to the number and location of the implants. The MSC/PATRAN software was used to develop the FE mesh of each model comprising of 1,101,954 elements with 252,693 nodes. The MSC/NASTRAN software was utilized as pre and post-processor for all mathematical calculations necessary to evaluate dental and mandibular biomechanics. One set of multiple vertical loads was used to simulate the possibility of occlusion status. And the von Mises stress values in the cortical bone, cancellous bone and implants were evaluated. The simulated results indicated that the stress distributions for FE models were largely affected by the number and location of implants. In the bone, similar to the single-tooth case, the von Mises stresses were all concentrated toward the cortical bone around the collar of the implants for FE models. In the 4-implants system, the model F-8 was generated the lowest MVMS in the position L6 of the cortical bone; in the 6-implants system, the model S-6 was generated the lowest MVMS in the position L5 of the cortical bone; in the 8-implants system, the model E-3 was generated the lowest MVMS in the position L5 of the cortical bone; in the 10-implants system, the model T-3 was generated the lowest MVMS in the position L5 of the cortical bone; in the 12-implants system, all of models were generated lower VMS in the cortical bone ; in the 14-implants system, the model FT-1 was generated the lowest MVMS in the position R6 of the cortical bone. From the literatures, the ultimate strength in the cortical bone surrounding the cervical regions of implants and the implant were about 100 and 550 MPa, respectively. If the loadings were increased to 5 times in this study, the MVMS of all materials would be increased to 5 times, too. According to these conditions, the model of F-8, S-6, E-3, T-3, TW-3 and FT-1 would be the best designs for each implant system and suitable to use in the clinical surgery. From the above statements, with more supporting implants, the treatment may be safer. Chwei-goong Tseng 曾垂拱 2008 學位論文 ; thesis 155 zh-TW
collection NDLTD
language zh-TW
format Others
sources NDLTD
description 博士 === 國立臺灣科技大學 === 機械工程系 === 97 === The purpose of this study was to compare the effects of various designs of implants’ placement on stress distribution in bone around the implants supporting one-unit fixed prosthesis. A computer tomography image was redrawn to reconstruct a digital three-dimensional solid model of a mandible including the cortical bone and cancellous bone. Moreover, the reverse engineering method and computer-aided design were employed to construct fourteen pieces of digital three-dimensional solid model of teeth including the anterior and posterior regions as well as implant and abutment. Each tooth was cut along the cervical line to obtain the crown, and all of the crowns were connected by using the MSC/PATRAN software and called the fixed prosthesis. All of the digital three-dimensional solid models were combined and transformed to the FE models by using the MSC/PATRAN software, and they were classified into 27 configurations according to the number and location of the implants. The MSC/PATRAN software was used to develop the FE mesh of each model comprising of 1,101,954 elements with 252,693 nodes. The MSC/NASTRAN software was utilized as pre and post-processor for all mathematical calculations necessary to evaluate dental and mandibular biomechanics. One set of multiple vertical loads was used to simulate the possibility of occlusion status. And the von Mises stress values in the cortical bone, cancellous bone and implants were evaluated. The simulated results indicated that the stress distributions for FE models were largely affected by the number and location of implants. In the bone, similar to the single-tooth case, the von Mises stresses were all concentrated toward the cortical bone around the collar of the implants for FE models. In the 4-implants system, the model F-8 was generated the lowest MVMS in the position L6 of the cortical bone; in the 6-implants system, the model S-6 was generated the lowest MVMS in the position L5 of the cortical bone; in the 8-implants system, the model E-3 was generated the lowest MVMS in the position L5 of the cortical bone; in the 10-implants system, the model T-3 was generated the lowest MVMS in the position L5 of the cortical bone; in the 12-implants system, all of models were generated lower VMS in the cortical bone ; in the 14-implants system, the model FT-1 was generated the lowest MVMS in the position R6 of the cortical bone. From the literatures, the ultimate strength in the cortical bone surrounding the cervical regions of implants and the implant were about 100 and 550 MPa, respectively. If the loadings were increased to 5 times in this study, the MVMS of all materials would be increased to 5 times, too. According to these conditions, the model of F-8, S-6, E-3, T-3, TW-3 and FT-1 would be the best designs for each implant system and suitable to use in the clinical surgery. From the above statements, with more supporting implants, the treatment may be safer.
author2 Chwei-goong Tseng
author_facet Chwei-goong Tseng
Yuan-shou Jiang
江元壽
author Yuan-shou Jiang
江元壽
spellingShingle Yuan-shou Jiang
江元壽
Mechanics Analysis of Various Placements of Implant in Implant-supported Full Arch Fixed Prosthesis of Mandible
author_sort Yuan-shou Jiang
title Mechanics Analysis of Various Placements of Implant in Implant-supported Full Arch Fixed Prosthesis of Mandible
title_short Mechanics Analysis of Various Placements of Implant in Implant-supported Full Arch Fixed Prosthesis of Mandible
title_full Mechanics Analysis of Various Placements of Implant in Implant-supported Full Arch Fixed Prosthesis of Mandible
title_fullStr Mechanics Analysis of Various Placements of Implant in Implant-supported Full Arch Fixed Prosthesis of Mandible
title_full_unstemmed Mechanics Analysis of Various Placements of Implant in Implant-supported Full Arch Fixed Prosthesis of Mandible
title_sort mechanics analysis of various placements of implant in implant-supported full arch fixed prosthesis of mandible
publishDate 2008
url http://ndltd.ncl.edu.tw/handle/43374661625497711331
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