Stress distribution in bone simulation model with pre-angled implants

Abstract

The aim of this study was evaluate the biomechanical behaviour of prostheses screwed into conventional (0° angulation) and pre-angled experimental (8, 12 and 20°) external hexagon implants (13 × 4 mm) by photoelastic analysis. Eight casts were made in photoelastic resin. Casts were divided into groups of single crowns or three combined elements. Each unit was positioned in a circular polariscope. By using a universal testing machine, 100 N loads were applied in the axial and oblique (45°) directions to fixed points on the occlusal surfaces of the crowns. Generated stresses were recorded photographically and analysed qualitatively in a graphics program. In single-element prostheses, the number of high-stress fringes increased with increasing implant angle. However, in three-element prostheses, there was no difference in the stress distribution with implant angle, except for the 12° implant that had a higher degree of stress. For the other groups pre-angulation of the implant increases the concentration and intensity of stresses for single prosthesis and has similar stress distribution in three-element fixed prostheses.

• Dental implants
• dental prosthesis
• implant-supported
• photoelastic analysis

Acknowledgements

The authors would like to thank the Foundation for Support to Research of the State of São Paulo (FAPESP, Brazil) for the financial support to this investigation.

Declaration of interest

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this article.