Evaluation of Two Protocols to Measure the Accuracy of Fixed Dental Prostheses: An In Vitro Study

Schönberger, Joana; Erdelt, Kurt-Jürgen; Baeumer, Daniel und Beuer, Florian (2019): Evaluation of Two Protocols to Measure the Accuracy of Fixed Dental Prostheses: An In Vitro Study. In: Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry, Bd. 28, Nr. 2, E599-E603

Abstract

Purpose The aim of this in vitro study was to compare two measurement protocols of the internal and marginal fit of three-unit zirconia fixed dental prostheses (FDPs). Materials and Methods Forty-four FDPs were fabricated for standardized dies by two laboratory CAD/CAM systems: Cercon (n = 22) and Ceramill (n = 22). The fitting was tested using a replica technique (RT = technique 1) with a light-body silicone stabilized with heavy-body material. After producing the replicas, cross-sections were made in the buccolingual and mesiodistal directions. FDPs were cemented on definitive dies, embedded, and sectioned (CST = technique 2). The marginal and internal fits were measured under an optical microscope at 50x magnification with a special software program. Data evaluation was performed according to prior studies at a level of significance of 5%. Results The mean internal gap width was 51 +/- 36 mu m for the RT and 52 +/- 35 mu m for the cross-section technique (CST) (p = 0.74). The mean marginal gap width was 27 +/- 18 mu m for RT and 30 +/- 19 mu m for CST (p = 0.19). Statistical tests showed no significant differences (p > 0.05). Conclusions Both techniques can be used for fit evaluation;however, the noninvasive RT is suitable for clinical use.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 1059-941X
• Sprache: Englisch