Biomechanical finite element analysis on the bone interface of posterior mandibular area under different setting forces after inclined implantation with angled abutment

doi:10.3969/j.issn.2095-4344.0006

Abstract

Abstract:

BACKGROUND: Single tooth loss at posterior mandibular area is difficult to complete regularly axial implantation under limited conditions. Concerning this problem, some scholars employ the skill of tilted implantation with abutment angulations to restore it. However, the security study of this design has been limited until now.

OBJECTIVE: To provide theoretical evidence for tilted implantation in the posterior mandibular area, and to make a biomechanical analysis on bone-implant interface after titled implantation under the same dynamic force stress.

METHODS: First, restoration models of implant crown at different tilting angles in posterior mandibular area were built and optimized using the software CBCT and DICOM. Then dynamic force stress was applied in chewing cycles of the crown model. Finally, the stress-strain analysis of bone-implant interface was made by utilizing the three-dimensional finite element software Ansys.

RESULTS AND CONCLUSION: (1) When the dental implant in the axis implantation was tilted to the lingual side at 5° or 10°, the maximum stress and strain values at the bone interface were 53.8 MPa and 2 671, respectively, under three loading conditions: the force during the chewing cycle was given vertical to the implant, toward the lingual side from the buccal side at 45° with the long axis of the tooth, and toward the buccal side from the lingual side at 45° with the long axis of the tooth. (2) When the implant inclined to the lingual side at a 15° angle, the rear edge of the implant was close to the interface between the cortical and cancellous bone, and the stress and strain values were bigger than those at any other implantation angle. (3) When the implant inclined to the lingual side at a 20° angle, the rear edge of the implant was beyond the interface between the cortical and cancellous bone, and contacted with the cortical bone that provided a support for the rear part of the implant. The stress and strain values on the bone interface were both reduced. The stress was concentrated in the cortex around the neck of the implant, and reduced a lot in the cancellous bone. The maximum strain value appeared at the contact site between the bone interface and the implant neck or rear part. It is concluded that in posterior mandibular area, the dental implant can be implanted at a < 10° linguoclination angle.

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, Biomechanics, Finite Element Analysis, Tissue Engineering

CLC Number:

R318

Liu Li-ping, Lv Xiao-fei, Deng Shu, Peng Cheng .

Biomechanical finite element analysis on the bone interface of posterior mandibular area under different setting forces after inclined implantation with angled abutment

[J]. Chinese Journal of Tissue Engineering Research, 2018, 22(2): 196-203.

Figures/Tables 18

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