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Effect of thermal cycling and disinfection on colour stability of denture base acrylic resin
Author(s) -
Goiato Marcelo C.,
dos Santos Daniela M.,
Baptista Gabriella T.,
Moreno Amália,
Andreotti Agda M.,
Bannwart Lisiane C.,
Dekon Stefan F.C.
Publication year - 2013
Publication title -
gerodontology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.7
H-Index - 54
eISSN - 1741-2358
pISSN - 0734-0664
DOI - 10.1111/j.1741-2358.2012.00676.x
Subject(s) - acrylic resin , temperature cycling , medicine , thermal stability , dwell time , dentistry , cycling , hypochlorite , composite material , nuclear chemistry , materials science , thermal , chemistry , organic chemistry , clinical psychology , physics , archaeology , meteorology , history , coating
doi: 10.1111/j.1741‐2358.2012.00676.x Effect of thermal cycling and disinfection on colour stability of denture base acrylic resin Objectives: The purpose of this study was to investigate the effect of thermal cycling and disinfection on the colour change of denture base acrylic resin. Materials and Methods: Four different brands of acrylic resins were evaluated (Onda Cryl, QC 20, Classico and Lucitone). All brands were divided into four groups ( n = 7) determined according to the disinfection procedure (microwave, Efferdent, 4% chlorhexidine or 1% hypochlorite). The treatments were conducted three times a week for 60 days. All specimens were thermal cycled between 5 and 55°C with 30‐s dwell times for 1000 cycles before and after disinfection. The specimens’ colour was measured with a spectrophotometer using the CIE L*a*b* system. The evaluations were conducted at baseline ( B ), after first thermal cycling (T 1 ), after disinfection ( D ) and after second thermal cycling (T 2 ). Colour differences (Δ E ) were calculated between T 1 and B (T 1 B ), D and B ( DB ), and T 2 and B (T 2 B ) time‐points. Results: The samples submitted to disinfection by microwave and Efferdent exhibited the highest values of colour change. There were significant differences on colour change between the time‐points, except for the Lucitone acrylic resin. Conclusions: The thermal cycling and disinfection procedures significantly affected the colour stability of the samples. However, all values obtained for the acrylic resins are within acceptable clinical parameters.