Influence of eccentric cyclic loading on implant components: Comparison between titanium and zirconia abutments

Abstract

The objective of this study was to investigate the effects of eccentric cyclic loading on implant components using the internal joint system with titanium and zirconia abutments. Abutments were made of either pure titanium (Ti group) or zirconia (TZP group). Cyclic loading test was conducted according to the specifications of ISO 14801. Loading condition was at 2 points assuming axial load and eccentric load. The reverse torque value reduced after the eccentric load and reduced more in the TZP group than the Ti group. Marginal gap changed after eccentric loading, and was greater in the TZP group. In the TZP group, changes in configuration were observed in the implant body, and Ti was detected on the abutment surface. From the above, the eccentric load may have worse effects than axial loads. It was suggested that the TZP group was clinically disadvantageous compared to the Ti group.

The effect of different implant‐abutment types and heights on screw loosening in cases with increased crown height space

“…Similar to the previous studies (Attiah et al, 2020;El-Sheikh et al, 2018;Nakano et al, 2021;Sammour et al, 2019), in the present study, to simulate the lateral forces inside the mouth, which have a vital effect on joint stability, a load 5 mm away from the center of the abutment was applied on a flat surface (Attiah et al, 2020;Sakamoto et al, 2016). However, some studies used crowns with an inclination of 30° (Tsuge & Hagiwara, 2009) or applied the force at an angle of 30°to the longitudinal axis (Kim et al, 2012).…”

Implant deformation and implant–abutment fracture resistance after standardized artificial aging: An in vitro study

“…With more mechanical loading energy consumed by the wear formation in one‐piece zirconia specimens, less stress could be transmitted to the implant body. Second, one‐piece zirconia abutments tend to induce more abutment screw torque loss after artificial aging 41–43 . Although not significant enough to cause a detachment of the implant and abutment, such a torque loss could facilitate micro‐movement between the two components during the mechanical cyclic loading 44 .…”

“…Second, one-piece zirconia abutments tend to induce more abutment screw torque loss after artificial aging. [41][42][43] Although not significant enough to cause a detachment of the implant and abutment, such a torque loss could facilitate micro-movement between the two components during the mechanical cyclic loading. 44 This may cause a greater proportion of stress to be transmitted to the abutment screw instead of the implant compared with when the screw is tightly fastened.…”