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Micromorphology analysis after professional oral hygiene procedures on zirconia restorations: in vitro study

Year: 2025
Type: article
Abstract: Objectives The aim of this in vitro study was to determine whether routine dental procedures, such as brushing and ultrasonic scaling, affect the surface microtopography of veneered and CAD/CAM milled zirconia (partially stabilized with yttrium) prosthetic restorations. Methods The samples (4 × 4 mm, thickness 2 mm; n = 36) were separated from zirconia blanks (3Y-TZP-LA). One group was veneered with ceramics (F) , and the other group of samples was CAD/CAM milled (C). Each group had two subgroups: polished (1) and glazed (2). The samples of both groups: zirconia veneered and zirconia milled were divided into 3 subgroups: 0-no treatment (control samples); a- exposed to ultrasonic scaling (with a ultrasonic scaler incorporated in a dental unit) for one minute; b- exposed to brushing with a professional dental polishing nylon brush and abrasive paste (Super Polish, Kerr) for one minute. The application of brushing or ultrasonic scaling of the samples lasted 1 min (in 10 rounds), imitating the procedure carried out over a period of 5 years. The parameters of surface micromorphology were calculated before and after simulating the given methods of the professional maintenance of oral hygiene. Scanning electron microscopy (SEM, Model JSM-6390, JEOL, Inc., Tokyo, Japan) was used to evaluate zirconia surface properties carried out at 150× magnification. Results The SEM analysis showed the greatest change in surface microtopography after the use of ultrasonic scaling on glazed zirconia samples, both veneered (88.31 μm) and CAD/CAM milled (45.38 μm) samples. Conclusions Routine methods of oral hygiene professional maintenance can damage the surfaces of glazed zirconia restorations.
Language: English
Subfield: Orthodontics
Field: Dentistry
Open Access status: green
OpenAlex ID: W7030296284
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