Effect of a continuous mechanical polishing protocol and toothbrushing on the surface roughness of acrylic resin teeth.

Autor:	Guimarães GG; Private practice., Sarte MF; Private practice., Barreto JO; Graduate student, Department of Restorative Dentistry, Federal University of Ceará, Fortaleza, Brazil., de Freitas-Pontes KM; Department of Restorative Dentistry, Federal University of Ceará, Fortaleza, Brazil., Regis RR; Department of Restorative Dentistry, Federal University of Ceará, Fortaleza, CE, Brazil, romuloregis@hotmail.com.
Jazyk:	angličtina
Zdroj:	American journal of dentistry [Am J Dent] 2020 Aug; Vol. 33 (4), pp. 187-190.
Abstrakt:	Purpose: To evaluate in vitro the effect of a continuous mechanical polishing protocol, performed in different periods, on the surface roughness of acrylic resin teeth subjected to toothbrushing (Br). Methods: Artificial acrylic teeth (n=30) were randomly divided into three groups according to the polishing protocol and toothbrushing (Br): Br; Br+Pol15 (Br associated with a biweekly polishing); Br+Pol30 (monthly polishing). Br group was subjected to a total of 89,000 brushing cycles. Polishing was performed by applying aluminum oxide paste to the specimens with a felt wheel coupled to an electric motor (5 seconds, 3,000 rpm) after each 741 and 1482 brushing cycles for Br+Pol15 and Br+Pol30 groups, respectively. A contact profilometer and an analytical balance were used to measure surface roughness and mass changes before (T0) and after 1, 2, 3, and 5 years (T4) of simulated toothbrushing. Scanning electron microscopy (SEM) images were obtained. Differences among groups were tested by means of two-way ANOVA/Bonferroni tests (P= 0.05). Results: Toothbrushing gradually increased surface roughness [T0 - 0.16 (0.01); T4 - 0.30 (0.10); P< 0.001]. The tested polishing promoted a significant roughness reduction (P< 0.001) for both biweekly [T4 - 0.09 (0.01) ] and monthly [T4 - 0.13 (0.02) ] regimes, and it did not influence the mass alterations caused by toothbrushing. SEM showed a smoother aspect of the material surface subjected to biweekly polishing with less defects caused by brushing abrasiveness. Clinical Significance: In order to reduce the effects of various deleterious factors on the properties of acrylic resin for removable prostheses during their period of use, a frequent mechanical polishing protocol could increase clinical performance and extend the lifespan of these appliances. Furthermore, a polishing protocol by means of a simple technique could be employed by patients in a home environment. Competing Interests: The authors declared no conflict of interest. (Copyright©American Journal of Dentistry.)
Databáze:	MEDLINE
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