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

Authors : Pınar Altıncı, Pınar Durkaya

Pages : 15-20

Doi:10.17096/jiufd.28587

View : 13 | Download : 6

Publication Date : 2016-10-03

Article Type : Research Paper

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 insert ignore into journalissuearticles values(4 mm x 5 mm x 30 mm); were fabricated.  Half of the specimens were aged by thermal cycling insert ignore into journalissuearticles values(between 5°C and 55°C, 60-second dwell time, 3000 cycles);. The specimens were stored at 37 o C in different drinks as non-aged and aged subgroups including water insert ignore into journalissuearticles values(control group);, black tea, green tea, sour cherry juice, coke and coffee insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(∆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 insert ignore into journalissuearticles values(∆E>1.5); insert ignore into journalissuearticles values(p<0.05);. The ∆E values of all test groups were detected within the acceptable clinical limits insert ignore into journalissuearticles values(∆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