LOGIN
 
Share Page:
Back

Volume 26 , Issue 4
July/August 2011

Pages 739–745


Effect of Material Selection on the Passivity of Fit of Implant-Supported Restorations Created with Computer-Aided Design/Computer-Assisted Manufacture

Matthias Karl, Priv-Doz, Dr Med Dent/Thomas D. Taylor, DDS, MSD


PMID: 21841982

Purpose: To compare the strain development of conventionally cast three-unit fixed dental prostheses (FDPs) and FDPs fabricated through computer-aided design/computer-assisted manufacture (CAD/CAM) using the strain gauge technique. Materials and Methods: A two-implant situation was transferred to an acrylic resin replica, and strain gauges were attached mesially and distally adjacent to the implants. Seven groups (n = 10) of cement-retained FDPs were manufactured from all restorative materials available for the Etkon CAD/CAM system (Straumann CADCAM). Three groups (n = 10) of conventionally cast screw- and cement-retained superstructures served as controls. Strain development during FDP fixation was recorded, and the logarithm of the absolute strain values was used for statistical analysis (multivariate analysis of variance with Pillai’s trace; α = .0033). Results: Significantly higher strain values for screw-retained FDPs were found than for all other restorations (P < .0000). Conventionally cast cement-retained restorations showed significantly higher strain levels as compared to CAD/CAM restorations fabricated from titanium (P = .0032) and green machined zirconia (P = .0026). Screw-retained superstructures bonded to gold cylinders showed significantly lower strain levels than FDPs made from titanium (P = .0001) and green machined zirconia (P = .0012). No significant differences between the various groups of CAD/CAM restorations could be detected, except that polyamide-resin restorations showed significantly higher strain levels than InCeram Zirconia restorations (P < .0000). Conclusions: CAD/CAM–fabricated restorations show fit that is at least as good as that seen for conventionally fabricated superstructures. The choice of restorative material seems to have only a minor effect on the passivity of fit. Int J Oral Maxillofac Implants 2011;26:739–745

Key words: cement retention, computer-aided design, computer-assisted manufacture, passive fit, screw retention, strain development


Full Text PDF File | Order Article

 

 
Get Adobe Reader
Adobe Acrobat Reader is required to view PDF files. This is a free program available from the Adobe web site.
Follow the download directions on the Adobe web site to get your copy of Adobe Acrobat Reader.

 

© 2014 Quintessence Publishing Co, Inc JOMI Home
Current Issue
Ahead of Print
Archive
Author Guidelines
About
Accepted Manuscripts
Submission Form
Submit
Reprints
Permission
Advertising
Quintessence Home
Terms of Use
Privacy Policy
About Us
Contact Us
Help