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Towards the Optimal Crown-to-Implant Ratio in Dental Implants

[+] Author Affiliations
T. J. Sego

Purdue University, West Lafayette, IN

Yung-Ting Hsu

University of Detroit Mercy, Detroit, MI

Tien-Min Gabriel Chu

Indiana University, Indianapolis, IN

Andres Tovar

Indiana University-Purdue University Indianapolis, Indianapolis, IN

Paper No. DETC2017-67889, pp. V003T13A009; 10 pages
  • ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 3: 19th International Conference on Advanced Vehicle Technologies; 14th International Conference on Design Education; 10th Frontiers in Biomedical Devices
  • Cleveland, Ohio, USA, August 6–9, 2017
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5815-8
  • Copyright © 2017 by ASME


Short dental implants are commonly recommended to be implemented with small crown-to-implant (C/I) ratios due to their mechanical stability — decreasing C/I ratios cause less deformation in skeletal tissue under occlusal force. However, the long-term stability of short implants with high C/I ratios remains a controversial issue due to biomechanical complications. This study evaluates the strain distribution and functional implications in an implant-supported crown with various C/I ratios using a high-fidelity, nonlinear finite-element model. Several clinical scenarios are simulated by loading implants with various implant lengths (IL) and crown heights (CH). Strain distribution and maximum equivalent strain are analyzed to evaluate the effects and significance of CH, IL, and the C/I ratio. The study shows underloading for certain implant configurations with high C/I ratio. Increasing IL and decreasing C/I in moderation demonstrates a positive effect in long-term stability.

Copyright © 2017 by ASME



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