Home Subscription Services
 
   

 
The International Journal of Adult Orthodontics & Orthogathic Surgery
AOOS Home Page
About the Editor
Reprints / Articles
Permissions
MEDLINE Search
 
 
 
 
 
FacebookTwitter

Publication:
International Journal of Adult Orthodontics and Orthognathic Surgery

Year 1993
Volume 8 , Issue 2

Back
Pages: 129 - 133

Comparison between uniaxial pull-out tests and torque measurement of 2.0-mm self- tapping screws

Boyle/Frost/Foley/Grady

This study investigates the retentive capacity of 2.0-mm self-tapping screws in porcine rib utilizing axial pull-out tests as well as torque measurements of insertion and stripping. These techniques have been performed independently; this analysis assesses the association between pull-out and torque values. The Goodman-Kruskel correl ation coefficient between pull-out and insertional torque is 0.13, while the correlation between pull-out and stripping torque is 0.21. Partial correlation indexes control the thickness of bone, a confounding factor. Nonparametric analysis of covariance showed no significant dif ference between insertion of screws and pull-out of the screws, but stripping versus pull-out test was significant. Given these findings, it appears that insertional torque may be used as an alternative technique for screw retention analysis. Because insertional torque tests can be conducted in the operating room, results of clinical studies can be compared to laboratory analyses.

 

  © 2014 Quintessence Publishing Co Inc
 

Home | Subscription Services | Books | Journals | Multimedia | Events | Blog
Terms of Use | Privacy Policy | About Us | Contact Us | Advertising | Help | Sitemap | Catalog