Evaluation of the fit of zirconia three-unit fixed partial dentures fabricated by different impression techniques.

Autor: Moustapha G; Department of Prosthodontics, Faculty of Dental Medicine, Lebanese University, Hadath, Lebanon., Azzam K; iDent Lab, Cluj-Napoca, Romania., AlShwaimi E; Department of Restorative Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia., Silwadi M; Dr Munir Silwadi Dental Centers, Abu Dhabi, United Arab Emirates., Ferrari M; Department of Medical Biotechnologies, Division of Restorative Dentistry and Endodontics, University of Siena, Siena, Italy., Salameh Z; Department of Research and Prosthodontics, Faculty of Dental Medicine, Lebanese University, Hadath, Lebanon.
Jazyk: angličtina
Zdroj: Journal of investigative and clinical dentistry [J Investig Clin Dent] 2019 Aug; Vol. 10 (3), pp. e12413. Date of Electronic Publication: 2019 Apr 18.
DOI: 10.1111/jicd.12413
Abstrakt: Aim: The aim of the present study was to evaluate the marginal and internal fit of zirconium fixed partial denture using different impression techniques.
Methods: A Nissin Typodont model, including maxillary central incisor and canine with missing lateral incisor, was selected for the present study. Thirty zirconium frameworks were fabricated following three impression techniques (N = 10), conventional silicone impression (group C), scanned dental impression (group S), and Trios 3 (3Shape) intraoral scanner (group T). An extra-fine milling strategy was applied.
Results: Group T had the smallest discrepancy compared to groups C (P = 0.006) and S (P = 0.052) at the marginal level, whereas it was larger at the incisal tip. Discrepancies in group T were smaller than group C (P = 0.004) when measured at the axial walls, and smaller than group S (P = 0.045) when measured at the chamfer area for the central teeth only. Samples in group T showed a greater percentage of equally extended restorations (52.5%), while other groups were mainly underextended (group C: 63.7%, group S: 68.8%).
Conclusion: Better adaptation was achieved with the intraoral scanner group, except at the incisal tip. Conventional and scanned impressions revealed a greater percentage of underextended restorations.
(© 2019 John Wiley & Sons Australia, Ltd.)
Databáze: MEDLINE
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