Abstract
Resin roughness and staining is a common problem in dentistry. Objective: the aim of this study was to verify the influence of single and multiple-steps polishing techniques on color stability and surface roughness of differents composite resins. Groups were (n=10): FS+CS. Filtek Supreme XT + clear strip; FS+PG. Filtek Supreme XT+PoGo; FS+SF. Filtek Supreme XT+Sof-Lex; AM+CS. Amelogen+clear strip; AM+PG. Amelogen+PoGo; AM+SF. Amelogen+Sof-Lex; TEC+CL .TetricEvoCeram + clear strip; TEC+PG .Tetric EvoCeram+ PoGo; TEC+SF .Tetric EvoCeram+Sof-Lex; CED+CS .Ceram X Duo+clear strip; CED+PG. Ceram X Duo+PoGo; CED+SF. Ceram X Duo+Sof-Lex. The initial color and roughness were determined before and after the polishing procedures. All specimens were stored for 7 days in coffee solution and the color assessment was performed. Two specimens from each group were evaluated by scanning electron microscopy. Roughness and color data were submitted to ANOVA and Tukey tests(p G7(5.8f)=G10(5.7ef)>G1(3.7c), followed by the G6(5.9f)>G9(3.1bc)=G12(2.1ab)>G3(1.7a). G3, after 7 days, presented the lowest values for ΔE(1.704). The lowest roughness values were observed when the clear strips were used regardless material type. The Sof-Lex system provided the lowest surface roughness values for all tested composite resins. Among composite resins the highest roughness values were found for Amelogen (G5–0.49 and G6–0.35), regardless polishing technique. All tested materials presented changes in color after immersion in coffee solution. The roughness surface and the staining of composite resins are material and polishing technique dependents.
Highlights
New restorative materials with large application on daily basis dentistry have been launched as a response for the technological improvement of composite resins and for the increased aesthetics request by patients
The mean values and standard deviation for composite resins and polishing systems are presented on figures 1 and 2 and respectively represent the mean values for Delta E and surface roughness (Ra expressed in μm)
Filtek Supreme (FS) composite resin and Ceram X Duo (CED) submitted to the Sof-Lex polishing system and after one week immersed in coffee solution, presented the lowest values for Delta E
Summary
New restorative materials with large application on daily basis dentistry have been launched as a response for the technological improvement of composite resins and for the increased aesthetics request by patients. The failure and success of an aesthetic restoration is dependent on chosen material, as well as color stability and material physical-mechanical properties (YAP, YAP, TEOCK, 2004; BARAKAH, TAHER, 2014). Several modifications on the fabrication of lightcured composite resins were accomplished and the major development has been done to the fillers’ system, aiming to decrease the mean size of particles and decrease alterations in geometry, and to incorporate greater quantities of inorganic components into the resin matrix (MITRA, WU, HOLMES , 2003, TERRY, 2004). A different mineral and distinct filler shapes have been employed to reduce polymerization shrinkage, to specially achieve better color stability, adequate wear resistance and clinically acceptable surface smoothness, resulting in better aesthetic results (MITRA, WU, HOLMES, 2003; YAP, YAP, TEOCK, 2004 ; TERRY, 2004).The type, size and Received: 28/03/15 Accepted: 20/10/15
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