EFFECT OF PRELOAD TORQUE ON THE ULTIMATE TENSILE STRENGTH OF IMPLANT PROSTHETIC RETAINING SCREWS

Merle J Jaarda; Michael E Razzoog; David G Gratton

doi:10.1097/00008505-199404000-00002

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EFFECT OF PRELOAD TORQUE ON THE ULTIMATE TENSILE STRENGTH OF IMPLANT PROSTHETIC RETAINING SCREWS

Journal article

Open access

Peer reviewed

EFFECT OF PRELOAD TORQUE ON THE ULTIMATE TENSILE STRENGTH OF IMPLANT PROSTHETIC RETAINING SCREWS

Merle J Jaarda, Michael E Razzoog and David G Gratton

Implant dentistry, Vol.3(1), pp.17-23

1994

DOI: 10.1097/00008505-199404000-00002

PMID: 7920384

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Abstract

The preload concept proposes that an optimal torque exists to which implant prosthetic retaining screws should be tightened. According to this theory, the preload prevents separation of implant components, thus protecting the screw from fracture. Recent research suggests that most implant-retained prostheses in function today were placed using improper preloads. The purpose of this investigation was to determine whether or not improper preloading of prosthetic implant-retaining screws would adversely affect their ultimate tensile strength. Fifteen Nobelpharma-slotted gold screws from one lot were tightened to 6, 10, and 15 N/cm with a torque gauge and ultimate tensile strength values determined. The procedure was duplicated using 15 Nobelpharma gold screws from another lot tightened to 0, 10, and 20 N/cm. Within each of the test groups, there was no significant difference in the ultimate tensile strength among the three preload torques. However, a paired t test (P = 0.005) determined that there was a significant difference between the two lots with respect to the ultimate tensile strength of the screws preloaded to 10 N/cm. Altering the preload torque applied to Nobelpharma gold-retaining screws does not affect their ultimate tensile strength. The ultimate tensile strength of the screws from the two lots differed, suggesting an unannounced change in component specifications.

Details

Title: Subtitle: EFFECT OF PRELOAD TORQUE ON THE ULTIMATE TENSILE STRENGTH OF IMPLANT PROSTHETIC RETAINING SCREWS
Creators: Merle J Jaarda
Michael E Razzoog
David G Gratton
Resource Type: Journal article
Publication Details: Implant dentistry, Vol.3(1), pp.17-23
DOI: 10.1097/00008505-199404000-00002
PMID: 7920384
ISSN: 1056-6163
eISSN: 1538-2982
Language: English
Date published: 1994
Academic Unit: Oral and Maxillofacial Surgery; Hospital Dentistry
Record Identifier: 9984065986802771

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