All ETDs from UAB

Advisory Committee Chair

Perng-Ru Liu

Advisory Committee Members

Daniel Givan

Jack Lemons

Sandra O'Neal

Keith Kinderknecht

Amjad Javed

Document Type


Date of Award


Degree Name by School

Master of Science in Dentistry (MScD) School of Dentistry


Zirconia-based implant abutments are widely used in prosthetic dentistry. Custom made abutments are utilized to correct for non-ideal implant positions and can successfully accommodate the morphologic requirements of the overlying crown. It was hypothesized that there will be difference in fracture strength and fracture mode of artificially aged zirconia implant abutments supported by implants at varying angulation, when load is applied to failure on overlying zirconia crowns. The implant-abutment-crown assemblies were subjected to steam autoclaving to induce some degree of phase transformation from tetragonal to weaker monoclinic form and to thermo-cycling to artificially age the samples. The effects of loading or occlusal forces applied to a model of implant-abutment-crown assembly with varying geometry of implant alignment was investigated in this study with customized zirconia implant abutments with internally hexed implant and overlying zirconia crowns loaded to fracture. Construct design and loading angulations were selected to simulate mouth conditions as closely as possible. Results showed that fracture strength of zirconia abutments was affected by the variation in the angulation of the implant. Aging did not seem to play a role in the fracture strength.

Included in

Dentistry Commons