Three-Dimensional Finite Element Analysis of Peri-implant Bone Stress with Implant Prostheses under Dynamic and Static Loadings

• Main Authors: Tong-Mei Wang, 王東美
• Other Authors: Li-Deh Lin
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/65950684642345410768

碩士 === 國立臺灣大學 === 臨床牙醫學研究所 === 88 === It is still controversial whether resin restoration can eliminate the impact effect and then reduce the peri-implant bone stress or strain during food chewing. The aim of this study was to investigate the effect of prosthesis material and chewing force on the peri-implant bone stress using three-dimensional finite element static and dynamic analysis. Four three-dimensional finite element models were generated using I-DEAS MS 6.0 software. Two consisted of a bone block (length: 42 mm, width: 11 mm, height: 21 mm) and the other two simulated the real human mandible with masticatory muscles attached. Each model included two splinted or non-splinted premolar simulated crowns supported by two adjacent cylinder implants (4 mm diameter/10 mm length). All models were meshed with four-node tetrahedral elements. The solutions were performed by ABAQUS 5.8-9 software. The study included 3 parts. Part I. The maximum equivalent bone stress (Von Mises stress; VM stress) was evaluated using the bone block models when a vertical or horizontal static load of 1N was applied to the center of a single resin, gold alloy or porcelain crown non-splinted or splinted with the adjacent crown. Part II. Impulsive loads with different duration were applied on the crown of bone block models and the effects were evaluated by dynamic analysis. The duration (0.1, 0.2, or 0.4 sec) was chosen near the duration of chewing contact and a much shorter duration (0.01 sec) was also chosen for comparison. Part III. Impulsive loads with different duration (0.01, 0.1, 0.2, or 0.4 sec) were applied on the crown of whole mandible models and the effects were compared with the results of static analysis. The results indicated that: (1) in single crown, no difference could be found in maximum VM stress between different materials while in splinted crowns, the maximum difference between the materials was 2% under 1N static vertical load and 14% under 1N static horizontal load; (2) in bone block models and the whole mandible models, an impulsive load applied on an implant-supported fixed partial prosthesis with duration near the time of chewing contact had no obvious impact effect on the peri-implant bone stress and the values of maximum Von Mises stress were similar to the values from the static analysis. The study suggests that the peri-implant bone stress is not obviously affected by restorative materials under static loads. And the dynamic analysis showed that an impulsive load with duration near the time of chewing contact had no obvious impact effect.