Fatigue properties on the failure mode of a dental implant in a simulated body environment

Abstract

This study undertook a fatigue test in a simulated body environment that has reflected the conditions (such as the body fluid conditions, the micro-current of cell membranes, and the chewing force) within a living body. First, the study sought to evaluate the fatigue limit under normal conditions and in a simulated body environment, looking into the governing factors of implant fatigue strength through an observation of the fracture mode. In addition, the crack initiation behavior of a tungsten-carbide-coated abutment screw was examined. The fatigue limit of an implant within the simulated body environment decreased by 19 % compared to the limit noted under normal conditions. Several corrosion pits were observed on the abutment screw after the fatigue test in the simulated body environment. For the model used in this study, the implant fracture was mostly governed by the fatigue failure of the abutment screw; accordingly, the influence by the fixture on the fatigue strength of the implant was noted to be low. For the abutment screw coated with tungsten carbide, several times the normal amount of stress was found to be concentrated on the contact part due to the elastic interaction between the coating material and the base material.

Spontaneous Formation of Titanium Nitride on the Surface of a Ti Rod Induced by Electro-Discharge-Heat-Treatment in an N2 Atmosphere

“…Figure 4a shows narrow scan spectra of the Ti 2p region for the Ti rod before and after electrical discharging with 3.5 kJ of input energy. The as-received Ti rod showed a Ti 2p 3 [18,19]. Thus, the surface of the as-received Ti rod before electrical discharging is primarily in the form of TiO 2 .…”

“…However, the practical use of these materials in biomedical applications is somewhat limited by their poor tribological properties [3,4]. Therefore, the surface treatments of Ti and Ti-based alloys have been intensively studied and widely reported in order to improve their surface characteristics.…”

Fatigue Life of Dental Implant- A Review

“…The results of the examinations suggested that, in spite of their adequate microstructures, the implants fractured due to the overload generated by stress raisers which were found in the implants. Min Gun kim [17] evaluate the fatigue limit under normal conditions and in a simulated body environment. This study used the GS II model of Osstem Implant as the implant specimen.…”