Accuracy of friction-style and spring-style mechanical torque limiting devices for dental implants

Statement of problem Accurate delivery of torque to implant prosthetic screws is critical to generate ideal preload in the screw joint and offer protection against screw loosening. Mechanical torque limiting devices (MTLDs) are available in 2 different styles that have not been compared for accuracy...

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Bibliographic Details
Published in:The Journal of prosthetic dentistry 2008-08, Vol.100 (2), p.86-92
Main Authors: Vallee, Mark C., BSc, DDS, MS, Conrad, Heather J., DMD, MS, Basu, Saonli, PhD, Seong, Wook-Jin, DDS, MS, PhD
Format: Article
Language:English
Subjects:
Analysis of Variance
Dental Abutments
Dental Prosthesis Retention - instrumentation
Dental Prosthesis, Implant-Supported
Dental Stress Analysis
Dentistry
Equipment Design
Friction
Technology, Dental - instrumentation
Torque
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Summary:Statement of problem Accurate delivery of torque to implant prosthetic screws is critical to generate ideal preload in the screw joint and offer protection against screw loosening. Mechanical torque limiting devices (MTLDs) are available in 2 different styles that have not been compared for accuracy. Purpose The purpose of this study was to determine the accuracy of friction-style and spring-style MTLDs in delivering target torque values. Material and methods Five MTLDs from each of 6 different implant manufacturers (n=30) were selected to determine their accuracy relative to their target torque values. All MTLDs were new; 3 types were of the friction style while 3 were of the spring style. To measure the output of each MTLD, a digital torque gauge with a 3-jaw chuck to hold the driver was used. Force was applied to the MTLD until either the friction style released at a precalibrated torque value or the spring style flexed to a precalibrated limit. The peak torque value registered by the digital torque gauge was recorded and the procedure was repeated 50 times for each MTLD. Statistical analysis used repeated-measures ANOVA (α=.05) to assess the accuracy of the MTLDs in delivering target torque values. Results Both the mean absolute difference (ABSDIFF) and the mean percentage deviation (PERDEV) between measured torque values and target torque values differed significantly ( P
ISSN:0022-3913
1097-6841
DOI:10.1016/S0022-3913(08)60154-7