Comput. Biol. Med. - Biological-data-based finite-element stress analysis of mandibular bone with implant-supported overdenture.

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Resumo

CKGROUND: This study aimed to evaluate the stress distribution in a mandibular bone with an implant-supported overdenture by a biological-data-based finite element analysis (FEA) utilizing personal CT images and in vivo loading data, and to evaluate the influence of the number and alignment of implants and bone conditions on the stress in peri-implant bone.METHODS: FEA models of a mandible were constructed for two types of overdentures: 4 implants supported overdenture (4-OD) and 2 implants supported overdenture (2-OD). The geometry of these models was constructed from CT images of a subject, who wore an implant-supported overdenture. The magnitude and direction of the loads on the implants for two types of overdentures during the maximal voluntary clenching were measured with 3D force transducers. FEA using these loads was carried out to observe stress distributions in peri-implant bone.RESULTS: Higher stress was observed in cortical bone around the implant neck. Stress in peri-implant bone for 4-OD was reduced in comparison with those for the 2-OD. For the 4-OD, notwithstanding such reduction of the stress, the stress concentrated at the cortical bone around the implant aligned with large deviation from load direction.CONCLUSIONS: In this study, biological data from a certain subject was successfully duplicated to the FEA models. The results demonstrate the mechanical prominence of using more implants. Even in 4 implants model, high stress was found around an implant with a large inclination and with thin cortical bone. This suffices to demonstrate the capability and usefulness of the biological-data-based FEA.

Resumo Limpo

ckground studi aim evalu stress distribut mandibular bone implantsupport overdentur biologicaldatabas finit element analysi fea util person ct imag vivo load data evalu influenc number align implant bone condit stress periimpl bonemethod fea model mandibl construct two type overdentur implant support overdentur od implant support overdentur od geometri model construct ct imag subject wore implantsupport overdentur magnitud direct load implant two type overdentur maxim voluntari clench measur d forc transduc fea use load carri observ stress distribut periimpl boneresult higher stress observ cortic bone around implant neck stress periimpl bone od reduc comparison od od notwithstand reduct stress stress concentr cortic bone around implant align larg deviat load directionconclus studi biolog data certain subject success duplic fea model result demonstr mechan promin use implant even implant model high stress found around implant larg inclin thin cortic bone suffic demonstr capabl use biologicaldatabas fea

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