EFFECTS OF THERMOCYCLING AND VARIOUS DRINKS ON COLOR STABILITY OF HEAT-POLYMERIZED ACRYLIC RESIN

Year 2016, Volume: 50 Issue: 3, 15 - 20, 03.10.2016

Pınar Altıncı Pınar Durkaya

https://doi.org/10.17096/jiufd.28587

Abstract

Purpose: The discoloration of acrylic resin denture bases may lead to significant esthetic problems. The aim of this in vitro study was to investigate the effects of frequently consumed drinks on the color changes of fresh and aged, heat-polymerized, conventional acrylic resin.

Material and Methods: Eighty-four, heat-polymerized acrylic resin specimens (4 mm x 5 mm x 30 mm) were fabricated.  Half of the specimens were aged by thermal cycling (between 5°C and 55°C, 60-second dwell time, 3000 cycles). The specimens were stored at 37^oC in different drinks as non-aged and aged subgroups including water (control group), black tea, green tea, sour cherry juice, coke and coffee (n=7). The discoloration of each specimen after 1- and 7-day storage in drinks were measured by a colorimeter based on CIE Lab system. The data of colour differences (∆E) were analyzed by ANOVA and Dunnet’s tests.

Results: Thermal cycling and storage in water induced a slight color change. The highest ∆E values were observed in the aged groups, which was also noticeable for black tea and sour cherry juice after 7 days of storage (∆E>1.5) (p<0.05). The ∆E values of all test groups were detected within the acceptable clinical limits (∆E<3.5).

Conclusion: These results suggest that the color stability of denture base acrylic resins is influenced by ageing. Black tea, sour cherry juice and coke can cause significant discolorations on acrylic resin denture bases.

Keywords

Acrylic resin, denture base; discoloration; drinks; thermocycling

References

• Assuncao WG, Barao VA, Pita MS, Goiato MC. Effect of polymerization methods and thermal cycling on color stability of acrylic resin denture teeth. J Prosthet Dent 2009;102(6):385-392.
• Ayaz EA, Altintas SH, Turgut S. Effects of cigarette smoke and denture cleaners on the surface roughness and color stability of different denture teeth. J Prosthet Dent 2014;112(2):241-248.
• Chandu GS, Asnani P, Gupta S, Faisal Khan M. Comparative evaluation of effect of water sorption on the surface properties of heat cure acrylic: An in vitro study. J Int Oral Health 2015;7(4):63-68.
• Goiato MC, Dos Santos DM, Baptista GT, Moreno A, Andreotti AM, Bannwart LC, Dekon SF. Effect of thermal cycling and disinfection on colour stability of denture base acrylic resin. Gerodontology 2013;30(4):276-282.
• Gregorius WC, Kattadiyil MT, Goodacre CJ, Roggenkamp CL, Powers JM, Paravina RD. Effects of ageing and staining on color of acrylic resin denture teeth. J Dent 2012;40 Suppl 2:e47-54.
• Hollis S, Eisenbeisz E, Versluis A. Color stability of denture resins after staining and exposure to cleansing agents. J Prosthet Dent 2015;114(5):709-714.
• Hong G, Murata H, Li Y, Sadamori S, Hamada T. Influence of denture cleansers on the color stability of three types of denture base acrylic resin. J Prosthet Dent 2009;101(3):205-213.
• Keyf F, Etikan I. Evaluation of gloss changes of two denture acrylic resin materials in four different beverages. Dent Mater 2004;20(3):244-251.
• Koksal T, Dikbas I. Color stability of different denture teeth materials against various staining agents. Dent Mater J 2008;27(1):139-144.
• Oguz S, Mutluay MM, Dogan OM, Bek B. Color change evaluation of denture soft lining materials in coffee and tea. Dent Mater J 2007;26(2):209-216.
• Ren J, Lin H, Huang Q, Zheng G. Determining color difference thresholds in denture base acrylic resin. J Prosthet Dent 2015;114(5):702-708.
• Sepulveda-Navarro WF, Arana-Correa BE, Borges CP, Jorge JH, Urban VM, Campanha NH. Color stability of resins and nylon as denture base material in beverages. J Prosthodont 2011;20(8):632-638.
• Moon A, Powers JM, Kiat-Amnuay S. Color stability of denture teeth and acrylic base resin subjected daily to various consumer cleansers. J Esthet Restor Dent 2014;26(4):247-255.
• Devlin H, Kaushik P. The effect of water sorption on acrylic surface properties. J Prosthodont 2005;14(4):233-238.
• Guler AU, Yilmaz F, Kulunk T, Guler E, Kurt S. Effects of different drinks on stainability of resin composite provisional restorative materials. J Prosthet Dent 2005;94(2):118-124.
• Compagnoni MA, Barbosa DB, de Souza RF, Pero AC. The effect of polymerization cycles on porosity of microwave-processed denture base resin. J Prosthet Dent 2004;91(3):281-285.
• Barbosa DB, de Souza RF, Pero AC, Marra J, Compagnoni MA. Flexural strength of acrylic resins polymerized by different cycles. J Appl Oral Sci 2007;15(5):424-428.
• Al-Haddad A, Vahid Roudsari R, Satterthwaite JD. Fracture toughness of heat cured denture base acrylic resin modified with chlorhexidine and fluconazole as bioactive compounds. J Dent 2014;42(2):180-184.
• de Castro DT, Valente ML, Agnelli JA, Lovato da Silva CH, Watanabe E, Siqueira RL, Alves OL, Holtz RD, Dos Reis AC. In vitro study of the antibacterial properties and impact strength of dental acrylic resins modified with a nanomaterial. J Prosthet Dent 2015;115(2):238-246.