Abstract

Background: Implant stability during healing is a pre-requisite for successful osseointegration. In the case of early or immediate implant loading, it is necessary to achieve high level of stabilization during surgical placement. Fixture stabilization can be measured by resonance frequency analysis or implant insertion resistance torque measurement. The aim of this study is to correlate pre-operative radiographic bone density to implant insertion resistance torque in human cadaver jaw bone.

Materials & Methods: Sixty-four implant osteotomy sites in human cadaver jaw bones were previously examined radiographically using quantitative computed tomography (QCT) and quantitative cone-beam computed tomography (QCBCT). Forty-two implant insertion sites randomly distributed throughout the range of bone densities as ranked by QCT and QCBCT Hounsfield Units (HU) were selected. Using an OsseoCare™ drilling unit, these sites were prepared for implant insertion with 2 mm. pilot and 3 mm twist drills, and the bone density of each site was ranked subjectively. Brånemark Mk III implants were inserted and the resistance torque was recorded on the drilling unit. The data were downloaded and analyzed.

Results: Subjective drilling bone density assessment showed only modest correlation with subjective radiographic bone density rating (Spearman's rho = 0.53). The subjective radiographic bone density produced correlations as high as 0.73 for the coronal third of the osteotomy sites when measured objectively by the QCT and 0.77 by the QCBCT. When implant insertion resistance torque was compared with QCT and QCBCT HU values, a modest Spearman's rho correlation of 0.62 and 0.63 was calculated, respectively.

Conclusion: Implant insertion resistance torque measurement may complement objective radiographic bone density as measured in HU by QCT and QCBCT in providing clinical bone quality information essential to making the implant loading time decision.

LLU Discipline

Periodontics

Department

Periodontics

School

Graduate School

First Advisor

Max Crigger

Second Advisor

Bernard Gantes

Third Advisor

Matt Riggs

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

2003

Date (Title Page)

9-2003

Language

English

Library of Congress/MESH Subject Headings

Alveolar Bone Loss; Periodontal Diseases -- surgery; Bone Density; Tooth -- surgery

Type

Thesis

Page Count

viii; 17

Digital Format

PDF

Digital Publisher

Loma Linda University Libraries

Usage Rights

This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.

Collection

Loma Linda University Electronic Theses and Dissertations

Collection Website

http://scholarsrepository.llu.edu/etd/

Repository

Loma Linda University. Del E. Webb Memorial Library. University Archives

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