Student Theses, Dissertations and Capstones

Document Type

Thesis - NSU Access Only

Degree Name

Master of Science (M.S.) in Dentistry

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College of Dental Medicine

Publication Date / Copyright Date



Background. There are many polishing systems available on the market have been used by many clinicians to improve the color stability, wear resistance and surface smoothness of composite restorations. Several changes have been made in the fabrication of dental resin composites to improve their mechanical strength and esthetic properties. Previous studies have shown that composite resins are susceptible to color instability because of surface roughness and exposure to various staining media, especially red wine, coffee, soda and tea. The purpose of this study was to evaluate the average surface roughness (Ra) and color stability of two direct resin compositespolished with four different polishing systems. Methods. Two resin composites (nanohybrid and nanofill) were evaluated using four polishing systems (Four versus three steps; diamond versus fluted burs). A disk-like specimen of each composite material was fabricated (10 mm in diameter and 2 mm thick). Ten specimens of each composite were randomly assigned to one of four polishing systems. The surface roughness values were measured using the profilometer. In addition, discoloration of the polished composites was evaluated after immersion into different solutions, namely coffee and red wine. The staining of the materials was evaluated using the spectrophotometer. Results. No difference was noted between any of the four different polishing techniques, type of composite and surface roughness (Ra). A one way ANOVA showed that there was a statistical significant difference between color change (ΔE) and polishing techniques, p




Health and environmental sciences



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