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Updated: Jun 10, 2026
Measuring the Complete-arch Distortion of an Optical Dental Impression
Published on: May 30, 2019
Evaluation of fit of zirconia posterior bridge structures constructed with different scanning methods and preparation
Raquel C Oyagüe1, M Isabel Sánchez-Jorge, Andrés Sánchez Turrión
1Department of Prosthodontics, Faculty of Dentistry, Complutense University of Madrid, U.C.M. Pza. Ramón y Cajal s/n, 28040 Madrid, Spain. raquel.castillo@odon.ucm.es
Abstract:
This study evaluated the influence of scanning method, abutment position, and preparation angle on the vertical seal of three-unit posterior zirconia structures. Sixty differently angled metallic models were machined to receive 30 bridge frameworks. For each preparation type, half of the structures were waxed-up and digitized, whereas the other half were computer-designed after the abutments were scanned. Once milled, the samples were cemented in standard fashion. Misfit was assessed by scanning electron microscopy. Three-way analysis of variance showed significant differences. Computer-designed structures achieved the highest accuracy (P < 0.0001). No significant differences were recorded concerning the abutment position and convergence angle. All discrepancy values were within the clinically acceptable range.
