10.25241/stomaeduj.2019.6(4).art.1-abstract

DENTAL MATERIALS

Effects of acIdıc/alcoholıc beverages on the surface roughness of composıte resıns lıght-cured for two dıfferent perıods of tıme

DOI: https://doi.org/10.25241/stomaeduj.2019.6(4).art.1

Abstract
Introduction The purpose of this study was to evaluate the surface roughness values of various resin-based composites (RBC) regarding exposure time and immersion in alcoholic and acidic beverages.
Methodology A total of 240 disc-shaped specimens (8 mm x 2 mm) were prepared from two microhybrid, one nanofilled and one nanohybrid RBC. Specimens were divided into two groups, according to the exposure time; 20 or 40 seconds and immersed for 10 min/day during one month in either non-alcoholic (Coca Cola), alcoholic (red wine) beverages, or distilled water (n=10). Surface roughness was measured after 24 hours, one week, and one month. Results were analyzed statistically using parametric and nonparametric test.
Results The roughness values (Ra) measured at 1-month immersion were signi-ficantly higher than those measured at 24 hours. There was no statistically significant difference due to exposure time (20 or 40 seconds) (p>0.05). Structure of RBC, and presence of alcohol, and phosphoric acid in the immersion solutions caused a statistically significant difference among baseline and 1-month immersion intervals (p<0.05). Among all RBCs, lowest Ra was observed in the microhybrid RBC Charisma Classic group.
Conclusion Immersion in both acidic and alcoholic beverages altered the surfaces of all RBCs and generated significant surface roughness changes. All analyzed RBCs showed unacceptable changes in surface roughness.

Keywords
Resin-based composites; Exposure time; Surface roughness; Aging.

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STOMATOLOGY EDU JOURNAL (Stoma Edu J) is a new international dental journal whose main purpose is to inform researchers, educators, graduates, postgraduates and practitioners about the latest trends in the field, which followed, would bring immediate and lasting benefits to the patients; and about opinions of the most authorized specialists on what is best in current practice, for the good of both, patient and dentist.
STOMATOLOGY EDU JOURNAL (Stoma Edu J) is a peer-reviewed, open access international dental journal to be database indexed, meant to contribute to the development and completion of the medical training of practitioners as Dr. Greene Vardiman Black stated: “the professional man has no right to be other than a continual student”.
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