Three-dimensional finite element analysis of dental implant combined with residual tooth after hemisection under dynamic loads

doi:10.3969/j.issn.2095-4344.1504

Abstract

Abstract:

BACKGROUND: The traditional treatment options after tooth hemisection are harmful to the abutment tooth. In recent years, with the development of oral implantology technique, combination of dental implant and residual tooth after hemisection provides a new way for mandibular molar restoration.

OBJECTIVE: To compare the biomechanical properties of implant-residual tooth supported prosthesis, single implant and double implants in the mandibular molar restoration under dynamic loads.

METHODS: Three-dimensional finite element models in which implant-residual tooth supported prosthesis, single implant and double implants were used to restore the mandibular first molar were established. A dynamic load of 0.875 s as a chewing cycle was applied on the restorations. Stress distributions of the implant, natural tooth and its surrounding bone tissues during the chewing cycle were analyzed.

RESULTS AND CONCLUSION: (1) At different stages of one chewing cycle, the stresses of the implant, cortical bone and cancellous bone changed as follows: lingual-buccal loading > buccal-lingual loading > vertical loading; the stress of the natural tooth changed as follows: vertical loading > buccal-lingual loading > lingual-buccal loading. (2) At the end of the chewing cycle, the stress distribution of the implant, cortical bone and cancellous bone was ranked as follows: the implant-residual tooth model > double-implant model > single-implant model. (3) The safety factor at the implant-abutment junction was lowest, which was the most dangerous area of fatigue failure. The implant-residual tooth supported prosthesis had a service life enough to bear chewing pressures in the oral cavity, but not developing fatigue fracture. All these results suggest that dental implant combined with residual tooth after hemisection follows the principle of bionics and plays an important role in the regulation of occlusal force, which is an acceptable treatment from a biomechanical perspective.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

Key words: Dental Implants, Dental Prosthesis, Finite Element Analysis, Molar, Tissue Engineering

CLC Number:

R459.9

Zou Yingnan, Wang Yibo, Ding Chao, Pan Xinyu, Shi Jiuhui . Three-dimensional finite element analysis of dental implant combined with residual tooth after hemisection under dynamic loads[J]. Chinese Journal of Tissue Engineering Research, 2019, 23(2): 178-183.

Figures/Tables 4

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