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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/117138
Title: 
Effect of Beverages and Mouthwashes on the Hardness of Polymers Used in Intraoral Prostheses
Author(s): 
Institution: 
Universidade Estadual Paulista (UNESP)
ISSN: 
1059-941X
Abstract: 
PurposeThe mechanical properties of acrylic resins used in intraoral prostheses may be altered by frequent exposure to liquids such as beverages and mouthwashes. This study aimed to evaluate the effect of thermocycling and liquid immersion on the hardness of four brands of acrylic resins commonly used in removable prostheses (Onda Cryl, QC-20, Classico, Lucitone).Materials and MethodsFor each brand of resin, seven specimens were immersed in each of six solutions (coffee, cola, red wine, Plax-Colgate, Listerine [LI], Oral B), and seven more were placed in artificial saliva (control). The hardness was tested using a microhardness tester before and after 5000 thermocycles and after 1, 3, 24, 48, and 96 hours of immersion. The results were analyzed using three-way repeated-measures ANOVA and Tukey's test (p < 0.05).ResultsThe hardness of the resins decreased following thermocycling and immersion in the solutions. Specimens immersed in cola and wine exhibited significant decreases in hardness after immersion for 96 hours, although the greatest significant decrease in hardness occurred in specimens immersed in LI. However, according to American Dental Association specification 12, the Knoop hardness of acrylic resins for intraoral prostheses should not be below 15. Thus, the median values of superficial hardness observed in most of the acrylic resins in this study are considered clinically acceptable.ConclusionsThe microhardness of polymers used for intraoral prostheses decreases following thermocycling. Among specimens immersed in beverages, those immersed in cola or wine experienced the greatest decrease in microhardness. Immersion of acrylic resins in LI significantly decreased the microhardness in relation to the initial value. Among the resins assessed, QC-20 exhibited the lowest initial hardness.
Issue Date: 
1-Oct-2014
Citation: 
Journal Of Prosthodontics-implant Esthetic And Reconstructive Dentistry. Hoboken: Wiley-blackwell, v. 23, n. 7, p. 559-564, 2014.
Time Duration: 
559-564
Publisher: 
Wiley-Blackwell
Keywords: 
  • Denture
  • complete
  • acrylic resins
  • polymers
  • hardness
Source: 
http://dx.doi.org/10.1111/jopr.12151
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/117138
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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