Year : 2019

Volume : Volume 10

Issue : Issue 4

Address for correspondence :
Dr. Sumit Duryodhan.
duryodhansumit@gmail.com

Abstract

Aim:  To evaluate the effect of stress distribution in retention screw of different crown- implant ratio. Materials & Methods: - This study was intended to evaluate the effect of stress distribution in retention screw, in implant-supported dental prosthesis with different heights of crowns to internal hexagonal implants. Implant: Nobel Biocare, Implant dimension: length 11.5 mm and Diameter 4 mm. Model: Model of mandibular first molar region. Solid models of mandibular segment, a porcelain crown, abutment, retention screw, Bones and dental Implant Systems are developed by using Computer Aided Design and Drafting technique (CAD). Three screw retained single crowns were modelled with different heights of crown of 10 mm, 12.5 mm and 15 mm, following a study by Misch. Three different models were created in Solid Edge V19 software with design parameters given above. The geometries of This Models are then imported in ANSYS Workbench 18.1 analysis software to build FE Model. Results: Higher stress was produced when an oblique load was applied, and the crown height corresponded with large size of the stress concentration area.  Conclusion: The increase in crown height increases the intensity of stress in the retention screw with under oblique loading.

Keywords: Internal hexagonal Implants, Retention screw, Crown- implant ratio, Finite Element Analysis.