Avaliação da sobrecarga em pilares e região periimplantar de implantes cone Morse, ferulizados ou não ferulizados: análise tridimensional em elementos finitos

Abstract

This study evaluated the stress distribution in abutments on Morse taper implants and peri-implantar surrounding bone supporting fixed partial dentures, splinted or non-splinted, under axial and oblique loading. The study simulates by means of Finite Element Analysis the loss of two posterior mandibular elements: 1st premolar and 2nd premolar. For mandible simulation a tridimensional box with Type II bone was simulated. The implant system and abutment were obtained using CAD models transferred by the company. Were used Morse taper Implant Titamax CM-Cortical Ø 3.75mm x 9.0mm and Abutment Pilar CM with 2,5mm height (Neodent, Curitiba, PR, Brazil) divided in two groups according the prosthetic rehabilitation: splinted and non-splinted; subjected to two types of loading: axial simulating functional masticatory contact and oblique simulating parafunctional occlusal contact. The implants were positioned 1.5mm under bone level according manufactures recommendation and the abutments were installed with aid of CAD software. The data were analyzed after dynamic loading of 100N in axial direction in the buccal cusp and the oblique loading (angle of 45o) in the distal-lingual cusp; both on 2nd premolar. The results showed lower tensions for F Group on axial loading for both abutment (77.37MPa) and peri-implantar surrounding bone (118.58MPa); however for NF Group axial loading demonstrated similar values as described previously. The oblique loading promoted higher stress for both abutment (505,67MPa) and peri-implantar surrounding bone (505,67MPa). The crowns splinting promotes lower stress on F Group abutment when compared with NF Group regardless the loading type. The stresses on peri-implantar surrounding bone during occlusal axial loading are similar regardless the surface contact between the prosthesis.