Are insertion torque and early osseointegration proportional? A histologic evaluation. Issue 11 (4th July 2014)

• Record Type: Journal Article
• Authors: Campos, Felipe E. B.; Jimbo, Ryo; Bonfante, Estevam A.; Barbosa, Darceny Z.; Oliveira, Maiolino T. F.; Janal, Malvin N.; Coelho, Paulo G.
• Is Part Of: Clinical oral implants research. Volume 26:Issue 11(2015:Nov.)
• Page Start: 1256
• Page End: 1260
• Publication Date: 2014-07-04
• Subjects: Dental implants -- Research -- Periodicals; 617.69
• DOI: 10.1111/clr.12448
• Languages: English
• ISSNs: 0905-7161

Abstract

<abstract abstract-type="main" id="clr12448-abs-0001"> <title>Abstract</title> <sec id="clr12448-sec-0001" sec-type="section"> <title>Objectives</title> <p>The objective of this histologic study was to determine the effect of three drilling protocols (oversized, intermediate, and undersized) on biologic responses to a single implant type at early healing periods (2 weeks <italic>in vivo</italic>) in a beagle dog model.</p> </sec> <sec id="clr12448-sec-0002" sec-type="section"> <title>Materials and methods</title> <p>Ten beagle dogs were acquired and subjected to surgeries in the tibia 2 weeks before euthanasia. During surgery, each dog received three Unitite implants, 4 mm in diameter by 10 mm in length, in bone sites drilled to 3.5, 3.75, and 4.0 mm in final diameter. The insertion torque was recorded during surgery, and bone‐to‐implant contact (BIC), and bone area fraction occupied (BAFO) measured from the histology. Each outcome measure was compared between treatment conditions with the Wilcoxon signed‐rank test. Bonferroni‐corrected statistical significance was set to 95%.</p> </sec> <sec id="clr12448-sec-0003" sec-type="section"> <title>Results</title> <p>Insertion torque increased as an inverse function of drilling diameter, as indicated by significant differences in torque levels between each pair of conditions (<italic>P</italic> = 0.005). BIC and BAFO levels were highest and statistically similar in the recommended and undersized conditions and significantly reduced in the oversized condition (<italic>P</italic> < 0.01).</p> </sec> <sec id="clr12448-sec-0004" sec-type="section"> <title>Conclusions</title> <p>Reduced drilling dimensions resulted in increased insertion torque (primary stability). While BIC and BAFO were maximized when drilling the recommended diameter hole, only the oversized hole resulted in evidence of statistically reduced integration.</p> </sec> </abstract>