Biomechanical evaluation of subcrestal dental implants with different bone anchorages

Autor(es)

Sotto-Maior, Bruno Salles ^[1] ; Lima, Camila de Andrade ^[2] ; Senna, Plinio Mendes ^[3] ; Camargos, Germana de Villa ^[2] ; Del Bel Cury, Altair Antoninha ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Juiz de Fora, Dept Restorat Dent, Sch Dent, Juiz de Fora, MG - Brazil

^[2] Univ Campinas UNICAMP, Dept Prosthodont & Periodontol, Piracicaba Dent Sch, Piracicaba, SP - Brazil

^[3] Unigranrio Univ, Dept Hlth Sci Ctr, Rio De Janeiro - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Oral Research; v. 28, n. 4, p. 306-312, JUL-AUG 2014.
• Citações Web of Science: 1

Resumo

This study evaluated the biomechanical influence of apical bone anchorage on a single subcrestal dental implant using three-dimensional finite element analysis (FEA). Four different bone anchorage designs were simulated on a posterior maxillary segment using one implant with platform switching and internal Morse taper connection as follows: 2 mm subcrestal placement with (SW) or without (SO) the implant apex engaged into the cortical bone or position at bone level with anchorage only in the crestal cortical (BO) bone or with bicortical fixation (BW). Each implant received a premolar crown, and all models were loaded with 200 N to simulate centric and eccentric occlusion. The peak tensile and compressive stress and strain were calculated at the crestal cortical, trabecular, and apical cortical bone. The vertical and horizontal implant displacements were measured at the platform level. FEA indicated that subcrestal placement (SW and SO) created lower stress and strain in the crestal cortical bone compared with crestal placement (BO and BW models). The SW model exhibited lesser vertical and horizontal implant micromovement compared with the SO and BO models under eccentric loading; however, stress and strain were higher in the apical cortical bone. The BW model exhibited the lowest implant displacement. These results indicate that subcrestal placement decreases the stress in the crestal cortical bone of dental implants, regardless of apical anchorage; however, apical cortical anchorage can be effective in limiting implant displacement. Further studies are required to evaluate the effects of possible remodeling around the apex on the success of subcrestal implants. (AU)

• Processo FAPESP: 11/22231-9 - Análise biomecânica das próteses unitárias parafusadas implanto-suportadas sob influência do tipo de pilar, plataforma protética, oclusão, tempo de carregamento protético e do material de recobrimento estético
• Beneficiário: Altair Antoninha Del Bel Cury
• Modalidade de apoio: Auxílio à Pesquisa - Regular