Microhardness and color monitoring of nanofilled resin composite after bleaching and staining

ABSTRACT

Objectives: The present study aimed to investigate the effect of staining solutions on microhardness and shade changes of a nanofilled resin composite, which had been previously in contact with bleaching agents. Materials and Methods: A total of 135 disk-shaped specimens (10 mm × 2 mm) were fabricated with a nanofilled resin (Filtek Supreme) and photocured with a Light Emission Diode (LED) unit and then allocated into three groups to be bleached with 10% or 16% carbamide peroxide (CP) bleaching agents or a 35% hydrogen peroxide (HP) product. Following bleaching, specimens within each group were subdivided into three groups to be immersed in coffee, red wine or distilled water. Microhardness and color were monitored at baseline, after bleaching and after staining. Results: Analysis of variance for split-plot design showed lower microhardness values when the composite had been in contact with HP (P < 0.0001). The specimens immersed in red wine and coffee provided lower microhardness values than those immersed in distilled water, regardless of the bleaching agent to which the composites were previously exposed. Kruskal Wallis and Dunn tests demonstrated that the composite was lighter after bleaching with a 35% HP agent (P < 0.0500). Conclusion: The composite was darker as a result of being immersed either in red wine or coffee, regardless of the bleaching agent.

Key words:

Bleaching agents - color change - laboratory research - microhardness - staining solutions - nanofilled composites

• REFERENCES

• 1 Ferracane JL. Resin composite – State of the art. Dent Mater 2011; 27: 29-38
• 2 Carvalho FG, Sampaio CS, Fucio SB, Carlo HL, Correr-Sobrinho L, Puppin-Rontani RM. Effect of chemical and mechanical degradation on surface roughness of three glass ionomers and a nanofilled resin composite. Oper Dent 2012; 37: 509-17
• 3 Larsen IB, Munksgaard EC. Effect of human saliva on surface degradation of composite resins. Scand J Dent Res 1991; 99: 254-61
• 4 Wongkhantee S, Patanapiradej V, Maneenut C, Tantbirojn D. Effect of acidic food and drinks on surface hardness of enamel, dentine, and tooth-coloured filling materials. J Dent 2006; 34: 214-20
• 5 Soares-Geraldo D, Scaramucci T, Steagall-Jr W, Braga SR, Sobral MA. Interaction between staining and degradation of a composite resin in contact with colored foods. Braz Oral Res 2011; 25: 369-75
• 6 Okte Z, Villalta P, García-Godoy F, Lu H, Powers JM. Surface hardness of resin composites after staining and bleaching. Oper Dent 2006; 31: 623-8
• 7 Hannig C, Duong S, Becker K, Brunner E, Kahler E, Attin T. Effect of bleaching on subsurface micro-hardness of composite and a polyacid modified composite. Dent Mater 2007; 23: 198-203
• 8 de Andrade IC, Basting RT, Lima-Arsati YB, do Amaral FL, Rodrigues JA, França FM. Surface roughness evaluation and shade changes of a nanofilled resin composite after bleaching and immersion in staining solutions. Am J Dent 2011; 24: 245-9
• 9 García-Godoy F, García-Godoy A, García-Godoy F. Effect of bleaching gels on the surface roughness, hardness, and micromorphology of composites. Gen Dent 2002; 50: 247-50
• 10 Polydorou O, Hellwig E, Auschill TM. The effect of at-home bleaching on the microhardness of six esthetic restorative materials. J Am Dent Assoc 2007; 138: 978-84
• 11 Yu H, Pan X, Lin Y, Li Q, Hussain M, Wang Y. Effects of carbamide peroxide on the staining susceptibility of tooth-colored restorative materials. Oper Dent 2009; 34: 72-82
• 12 Celik C, Yüzügüllü B, Erkut S, Yazici AR. Effect of bleaching on staining susceptibility of resin composite restorative materials. J Esthet Restor Dent 2009; 21: 407-14
• 13 Browning WD. Use of shade guides for color measurement in tooth-bleaching studies. J Esthet Restor Dent 2003; 15 (Suppl. 01) S13-20
• 14 Kihn PW, Barnes DM, Romberg E, Peterson K. A clinical evaluation of 10 percent vs. 15 percent carbamide peroxide tooth-whitening agents. J Am Dent Assoc 2000; 131: 1478-84
• 15 Bailey SJ, Swift Jr EJ. Effects of home bleaching products on composite resins. Quintessence Int 1992; 23: 489-94
• 16 Curtis AR, Palin WM, Fleming GJ, Shortall AC, Marquis PM. The mechanical properties of nanofilled resin-based composites: Characterizing discrete filler particles and agglomerates using a micromanipulation technique. Dent Mater 2009; 25: 180-7
• 17 Attin T, Hannig C, Wiegand A, Attin R. Effect of bleaching on restorative materials and restorations – A systematic review. Dent Mater 2004; 20: 852-61
• 18 Malkondu Ö, Yurdagüven H, Say EC, Kazazoğlu E, Soyman M. Effect of bleaching on microhardness of esthetic restorative materials. Oper Dent 2011; 36: 177-86
• 19 Yu H, Li Q, Hussain M, Wang Y. Effects of bleaching gels on the surface microhardness of tooth-colored restorative materials in situ . J Dent 2008; 36: 261-7
• 20 Almeida GS, Poskus LT, Guimarães JG, da Silva EM. The effect of mouthrinses on salivary sorption, solubility and surface degradation of a nanofilled and a hybrid resin composite. Oper Dent 2010; 35: 105-11
• 21 Gordan VV, Patel SB, Barrett AA, Shen C. Effect of surface finishing and storage media on bi-axial flexure strength and microhardness of resin-based composite. Oper Dent 2003; 28: 560-7
• 22 Lu H, Roeder LB, Lei L, Powers JM. Effect of surface roughness on stain resistance of dental resin composites. J Esthet Restor Dent 2005; 17: 102-8
• 23 Canay S, Cehreli MC. The effect of current bleaching agents on the color of light-polymerized composites in vitro . J Prosthet Dent 2003; 89: 474-8
• 24 Durner J, Spahl W, Zaspel J, Schweikl H, Hickel R, Reichl F. ×. Eluted substances from unpolymerized and polymerized dental restorative materials and their Nernst partition coefficient. Dent Mater 2010; 26: 91-9
• 25 Topcu FT, Sahinkesen G, Yamanel K, Erdemir U, Oktay EA, Ersahan S. Influence of different drinks on the colour stability of dental resin composites. Eur J Dent 2009; 3: 50-6