| Effect of pilot hole diameter and tapping on insertion torque and axial pullout strength of 4.0-mm cancellous bone screws. | |
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MedLine Citation:
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PMID: 22126695 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Objective-To evaluate the effects of pilot hole diameter and tapping on insertion torque and axial pullout strength of 4.0-mm cancellous bone screws in a synthetic canine cancellous bone substitute. Sample-75 synthetic cancellous bone blocks (15 blocks/group). Procedures-For groups 1 through 5, screw size-pilot hole diameter combinations were 3.5-2.5 mm (cortical screws), 4.0-2.5 mm, 4.0-2.5 mm, 4.0-2.0 mm, and 4.0-2.0 mm, respectively. Holes were tapped in groups 1, 2, and 4 only (tap diameter, 3.5, 4.0, and 4.0 mm, respectively). One 70-mm-long screw was inserted into each block; in a servohydraulic materials testing machine, the screw was extracted (rate, 5 mm/min) until failure. Mean group values of maximum insertion torque, axial pullout strength, yield strength, and stiffness were determined. Results-Mean maximum insertion torque differed significantly among the 5 groups; the group 5 value was greatest, followed by group 3, 4, 2, and 1 values. Group 3, 4, and 5 axial pullout strengths were similar and significantly greater than the group 2 value; all values were significantly greater than that for group 1. Group 5 and 4 yield strengths were similar and significantly greater than the group 3, 2, and 1 values. Stiffness in group 3 was similar to group 4 and 2 values but significantly greater than the group 5 value; all values were significantly greater than that for group 1. Conclusions and Clinical Relevance-These synthetic cancellous bone model findings suggested that tapping a 2.0-mm-diameter pilot hole when placing a 4.0-mm screw is the optimal insertion technique. |
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Authors:
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Kevin A R Kunkel; Jonathan T Suber; Patrick D Gerard; Michael P Kowaleski |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: American journal of veterinary research Volume: 72 ISSN: 1943-5681 ISO Abbreviation: Am. J. Vet. Res. Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-11-30 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375011 Medline TA: Am J Vet Res Country: United States |
Other Details:
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Languages: eng Pagination: 1660-5 Citation Subset: IM |
Affiliation:
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South Carolina Veterinary Specialists, 3912 Fernandina Rd, Columbia, SC 29210. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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