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Volume 20 , Issue 2
March/April 2007

Pages 125131

A Comparison of the Accuracy of Fit of 2 Methods for Fabricating Implant-Prosthodontic Frameworks

Sara A. Al-Fadda, BDS, MSc, FRCD(C) / George A. Zarb, BChD, DDS, MS, MS, FRCD(C) / Yoav Finer, B Med Sc, DMD, MSc, PhD, MSc, FRCD(C)

PMID: 17455431

Purpose: To compare the in vitro 3-dimensional (3D) accuracy of fit of laser-scanned Computer Numeric Controlled (CNC)milled implant titanium frameworks to that of conventional cast frameworks. Materials and Methods: Nine cast frameworks were fabricated on the mandibular master casts of 9 patients with 5 implants each following the well-established conventional fabrication technique. The frameworks were then laser scanned, and 9 CNC-milled titanium frameworks matching the outline of the conventional frameworks were fabricated. The accuracy of fit of both framework types was measured using a contact-type coordinate measuring machine and a computer program developed specifically for this purpose. Statistical analysis was done by a series of paired t tests. Results: The laser-scanned CNC-milled frameworks showed significantly less distortion along the x-axis (transversal, dx) compared with the conventional frameworks (means: 33.7m and 49.2 m, respectively) (P = .011). The titanium frameworks also demonstrated significantly less distortion on the horizontal plane compared with the conventional frameworks (means: 56 m and 85 m, respectively) (P = .012). The dy (sagittal) and dz (vertical) axes and total 3D distortion (⁄dx2 + dy2 + dz2) showed less distortion overall in the laser-scanned CNC-milled frameworks, but this was not statistically significant (mean: 22.3 vs 35.6 m, 13.3 vs 59.2 m, 51 vs 114.1 m, respectively, for y, z, and 3D distortion). Conclusion: Within the limitations of this study, fabrication of an implant-prosthodontic framework using the CNC milling technique yields a more accurate fit than the currently used cast technique. In vivo studies are needed to investigate the clinical significance of this recorded difference. Int J Prosthodont 2007;20:125131.

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