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Influence of Screw Length and Bone Thickness on the Stability of Temporary Implants

Laboratory of Biomaterials, Instituto Militar de Engenharia, Rio de Janeiro, RJ 22290-270, Brazil
School of Dentistry, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil
Author to whom correspondence should be addressed.
Academic Editor: Juergen Stampfl
Materials 2015, 8(9), 6558-6569;
Received: 17 July 2015 / Accepted: 16 September 2015 / Published: 23 September 2015
(This article belongs to the Section Biomaterials)
PDF [1940 KB, uploaded 23 September 2015]


The purpose of this work was to study the influence of screw length and bone thickness on the stability of temporary implants. A total of 96 self-drilling temporary screws with two different lengths were inserted into polyurethane blocks (n = 66), bovine femurs (n = 18) and rabbit tibia (n = 12) with different cortical thicknesses (1 to 8 mm). Screws insertion in polyurethane blocks was assisted by a universal testing machine, torque peaks were collected by a digital torquemeter and bone thickness was monitored by micro-CT. The results showed that the insertion torque was significantly increased with the thickness of cortical bone from polyurethane (p < 0.0001), bovine (p = 0.0035) and rabbit (p < 0.05) sources. Cancellous bone improved significantly the mechanical implant stability. Insertion torque and insertion strength was successfully moduled by equations, based on the cortical/cancellous bone behavior. Based on the results, insertion torque and bone strength can be estimate in order to prevent failure of the cortical layer during temporary screw placement. The stability provided by a cortical thickness of 2 or 1 mm coupled to cancellous bone was deemed sufficient for temporary implants stability. View Full-Text
Keywords: stability; cortical thickness; temporary screws; torque; bone stability; cortical thickness; temporary screws; torque; bone

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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MDPI and ACS Style

Fernandes, D.J.; Elias, C.N.; Ruellas, A.C.O. Influence of Screw Length and Bone Thickness on the Stability of Temporary Implants. Materials 2015, 8, 6558-6569.

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