Avaliação da desadaptação vertical de infraestruturas protéticas cad/cam de titânio e de zircônia sobre implantes

Abstract

Evaluation of the vertical misfit of CAD/CAM titanium and zirconium implant-prosthodontic frameworks. The passive adaptation of implant prosthesis infrastructure is a mechanical parameter that can interferes in the durability of prosthetic rehabilitation. Some complications such as fracture and / or loosening of the prosthesis retaining screw, plaque buildup, peri-implantitis and loss of the implant osseointegration can be caused by deficiency in the adaptation of the prosthetic infrastructures. The objective of this study is to test the vertical misfit prosthesis infrastructure on implant made of Titanium (Ti6Al4V) and zirconia, both milled by CAD / CAM system. This study was conducted in an aluminum master model with anatomical shape of a human lower arch with four RC implant analogs (Regular Cross Fit) to straight multi-base pillar with a diameter of 5.0 mm titanium alloy (Institut Straumann AG, Switzerland) positioned between the mental foramen. Over te analogues were virtually made prosthetic infrastructure and then milled by CAD / CAM system in Titanium alloy (Ti6Al4V) and Zirconia, five bodies of the test piece for each material. The readings of the vertical misfit in infrastructure prosthetic interface / pillars were measured using SEM (scanning electron microscopy) and ImageJ software and the values were analyzed statistically. The results demonstrated average misfit value of 6.4 m for the titanium group, and misfit of 9.0 m for the zirconia group. The results also revealed that there was no statistically significant difference in the vertical misfit between Titanium infrastructure and Zirconia, using CAD / CAM system. SEM analysis revealed higher sensitivity in milling technique in zirconia infrastructures.