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Effect of chemical degradation followed by toothbrushing on the surface roughness of restorative composites
Voltarelli, Fernanda Regina; Santos-Daroz, Claudia Batitucci dos; Alves, Marcelo Corrêa; Cavalcanti, Andrea Nóbrega; Marchi, Giselle Maria.
  • Voltarelli, Fernanda Regina; s.af
  • Santos-Daroz, Claudia Batitucci dos; s.af
  • Alves, Marcelo Corrêa; s.af
  • Cavalcanti, Andrea Nóbrega; Federal University of Bahia. Dental School.
  • Marchi, Giselle Maria; State University of Campinas. Piracicaba Dental School. BR
J. appl. oral sci ; 18(6): 585-590, Nov.-Dec. 2010. ilus, tab
Article in English | LILACS | ID: lil-573728
ABSTRACT

OBJECTIVES:

The aim of the present study was to assess the effect of the exposure to food-simulating liquids prior to brushing simulation on the surface roughness of five composite materials (Quixfil, Filtek Supreme, Esthet-X, Filtek Z250, Tetric Ceram). Material and

METHODS:

Twenty cylinders (5 mm diameter and 4 mm height) of each composite were randomly allocated to 4 groups (n=5), according to the food-simulating liquid in which they were immersed for 7 days at 37°C artificial saliva, heptane, citric acid, and ethanol. After this period, the top surface of composite cylinders was submitted to 7,500 brushing cycles (200 g load). Measurements of the surface roughness (Ra, »m) were carried out before and after the exposure to the chemicals/brushing simulation. Changes on the morphology of composite surfaces were observed through scanning electron microscopy (SEM).

RESULTS:

The statistical analysis (ANOVA with cofactor / Tukey's test, α=5 percent) detected a significant interaction between solutions and composite resins. Esthet-X, Filtek Z250 and Tetric Ceram were not affected by the food-simulating liquids/toothbrushing. Citric acid and ethanol increased the surface roughness of Quixfil and Filtek Supreme, respectively. SEM images corroborate the surface roughness findings, demonstrating the negative effect from chemical solutions and mechanical abrasion.

CONCLUSIONS:

The surface roughness of composite resin materials are differently affected by the food-simulating solutions, depending on the immersion media.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Toothbrushing / Composite Resins Language: English Journal: J. appl. oral sci Journal subject: Dentistry Year: 2010 Type: Article Affiliation country: Brazil Institution/Affiliation country: State University of Campinas/BR

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Full text: Available Index: LILACS (Americas) Main subject: Toothbrushing / Composite Resins Language: English Journal: J. appl. oral sci Journal subject: Dentistry Year: 2010 Type: Article Affiliation country: Brazil Institution/Affiliation country: State University of Campinas/BR