Evaluation of the Biomechanical Interactions in Frialit-2, Bicon and ITI Implant Systems with Different Placements and Its Surrounding Bone at Facial Maxillary Region under Various Bone Quality

• Main Authors: Yu-Chan Kuo, 郭育昌
• Other Authors: Chun-Li Lin
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/01081991906167597247

碩士 === 長庚大學 === 醫療機電工程研究所 === 93 === The implant of osseointegration has become the mainstream in implant dentistry. However, it requires successful osseointegration conditions. From the perspective of biomechanics, the factors affecting the maxillary implant dentistry include the bone structure surrounding the implant, the bone density, the selection of implant, and the implant position. The objectives of this study are to discuss the effects of the abovementioned four factors on the stability of the implant and the biomechanics of the surrounding bond. The results are provided to as reference to clinical practice of implants. The study combined medical image, reverse engineering, computer-aided engineering design, and computer-aided engineering analysis technologies, and constructed nine sets of finite element models with three types of implants and three implant position based on the abovementioned factors. It utilized the change of varied material characteristics to simulate four types of bone densities. In terms of the boundary conditions, constant axial force (100N) and lateral force (100N) were applied at 2/3 of the crown to find out the mechanical reaction of the inside of the implant and surrounding bone. The data were analyzed with ANOVA to obtain the affecting ratio of each parameter, and main factor effect was applied to determine the optimal parameters. The results showed that the stress difference of the bone strain and implant at the ridge of the supramaxilla and mandible is not significant as expected. The simulation of the lateral occlusion showed greater effect on the bone ridge and implant than the axial occlusion. Therefore, it is suggested to physician that the adjustment of occlusion could be utilized during the implant to reduce the possible lateral occlusive force to be received by the implant. In the simulation of the implant position, the range of stress strain for position of OFW was reasonable. The simulation of axial occlusion at position of OR showed higher compact bone strain. Both axial and lateral occlusion simulations showed higher bending moment to be received by implant. The force in the simulation of all occlusion simulations at position of OFB transmitted through contact areas of compact bone to the surrounding bone, thus, reduced the overall stress strain. Therefore, it is suggested that physicians could implant along the major axis of the occlusive force for improved strain distribution. In the simulation of implant selection, TIS implant could result in lower bone strain at all implant positions. Under lateral occlusive force, TIF implant would result in increase of compact bone strain, but not in axial occlusion. The distribution of the stress strain for retaining screw was the least satisfactory among the three. Therefore, it is suggested to physicians using combination of TIS abutment and implant. In simulation of bone density, the stress strain of all components would increase as the bone density decreases, and increase sharply when the bone density reaches 4. It is suggested to physicians using compressing and condensing method in case of poor bone density and unavoidable implant, in order to improve the bone density surrounding the implant and create satisfactory force transmission mechanism; or implanting at positions of OFW or OFB, and using TIS implant.