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In vitro assessment of roughness and color stability of acrylic resin artificial teeth submitted to brushing and immersion in beverages

Grant number: 12/19423-6
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): April 01, 2013
Effective date (End): March 31, 2014
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Ana Carolina Pero Vizoto
Grantee:Izabela Borghi
Home Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil

Abstract

The acrylic resin artificial teeth are commonly used in the manufacture of removable partial or complete dentures. The abrasion caused by brushing may result in increased roughness of artificial teeth, facilitating the accumulation of biofilm, and may still be associated with increased deposition of dyes from beverages, resulting in staining of teeth and disfigurement. This study will evaluate the effect of brushing and soaking in drinks on surface roughness and color stability of two types of acrylic resin teeth. The specimens correspond to upper central incisors of two types of artificial acrylic resin teeth (Biotone and Biotone IPN, Dentsply Ind. Com Ltda. Petrópolis - RJ, Brazil). The artificial tooth will be divided into two study sequences, that for each type of tooth, half of the sample will be subjected to brushing and then immersion in beverages, and the other half will be subject only to immersion in beverages. Readings roughness and color stability will be conducted on separate occasions: T0 (before treatment), T1 (after brushing) and T2 (after immersion in beverages). For the evaluation will be conducted 11,000 brushing cycles in brushing machine, simulating a period of one year, and for the evaluation of color stability specimens are immersed in instant coffee, cola and distilled water (control) for 12 days , simulating one year of use. The color variations are captured by a spectrophotometer, and the roughness is analyzed through a digital rugosimeter. The data will be tabulated and submitted to appropriate statistical tests, according to the adherence to normal, and will be used a significance level of 5%.