Freehand vs. depth-gauge rotary instruments for veneer preparation: A controlled randomized simulator study.

Autor:	Ahlers MO; Department of Prosthetic Dentistry, Center for Dental and Oral Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.; CMD-Center Hamburg-Eppendorf, Hamburg, Germany., Cachovan G; Oral Healthcare DACH, Philips GmbH, Hamburg, Germany.; Department of Periodontics, Preventive and Restorative Dentistry, University Medical Center Hamburg-Eppendorf, Hamburg, Germany., Jakstat HA; Department of Prosthetic Dentistry and Dental Materials and Special Care, Center for Dental and Oral Medicine, University of Leipzig, Leipzig, Germany., Edelhoff D; Department of Prosthetic Dentistry, University Hospital LMU Ludwig-Maximilians, Munich, Germany., Roehl JC; CMD-Center Hamburg-Eppendorf, Hamburg, Germany., Platzer U; Department of Periodontics, Preventive and Restorative Dentistry, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
Jazyk:	angličtina
Zdroj:	Journal of prosthodontic research [J Prosthodont Res] 2024 Jul 08; Vol. 68 (3), pp. 407-414. Date of Electronic Publication: 2023 Oct 17.
DOI:	10.2186/jpr.JPR_D_22_00317
Abstrakt:	Purpose: To investigate whether depth-gauge burs in veneer preparations influence preparation depth in a randomized, controlled, single-blinded trial and whether inexperienced operators can perform adequate veneer preparations. Methods: Participants were 20 undergraduate dental students with no prior veneer preparation experience. The instruments used were the "Laminate Veneer System" (LVS), "Keramik-Veneers. de" (KVD), and a "Freehand" group (FH) for reference. All participants prepared three educational acrylic resin maxillae and three mandibular central incisors mounted in typodonts in patient simulators. The objectives were to achieve a preparation depth of 0.6 mm (tooth 11) and 0.4 mm (tooth 31). The sequences of the instruments used and prepared teeth were randomized. The measurements were performed using a laser triangulation coordinate-measuring machine. The data were stratified according to tooth location. Results: The preparation depths of both depth-gauge-instrument-groups LVS and KVD achieved the objectives significantly better than did the instruments from the "Freehand" group (P < 0.001). The differences between the depth gauge groups were insignificant, although the maximum preparation depths were smaller in the KVD group. Regarding the prepared teeth, the preparation depths in the mandibular incisors were lower, and the differences were smaller. Conclusions: The use of special depth-gauge burs for initial veneer preparation leads to significantly lower preparation depths than "Freehand" preparations. The tapered instruments resulted in a lower incidence of extreme preparation depths. The inexperienced operators performed veneer preparation remarkably well.
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu