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Effect of Accelerated Aging on Permanent Deformation and Tensile Bond Strength of Autopolymerizing Soft Denture Liners
Author(s) -
Takahashi Jessica Mie Ferreira Koyama,
Consani Rafael Leonardo Xediek,
Henriques Guilherme Elias Pessanha,
de Arruda Nóbilo Mauro Antônio,
Mesquita Marcelo Ferraz
Publication year - 2011
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2010.00679.x
Subject(s) - ultimate tensile strength , crosshead , materials science , bond strength , accelerated aging , deformation (meteorology) , composite material , tensile testing , universal testing machine , silicone , adhesive , flexural strength , layer (electronics)
Purpose: The aim of this study was to evaluate the effect of different accelerated aging times on permanent deformation and tensile bond strength of two soft chairside liners, acrylic resin (T) and silicone (MS) based. Materials and Methods: Different specimens were made for each test of each reliner. The specimens (n = 10) were submitted to accelerated aging for 2, 4, 8, 16, 32, and 64 cycles. Tensile bond strength testing was performed at a crosshead speed of 5 mm/min and permanent deformation with a compressive load of 750 gf. Data were submitted to Mann‐Whitney test to compare the materials at different times, and Kruskal‐Wallis and Dunn tests were used for comparing aging intervals within a given reliner. Results: MS presented a lower percentage of permanent deformation ( p < 0.0001) and higher tensile bond strength ( p < 0.0001) than T in all time intervals and was not affected by the accelerated aging process, which reduced the permanent deformation and increased tensile bond strength of T ( p < 0.05). Conclusion: MS presented lower permanent deformation and higher tensile bond strength than T. Although T presented changes in those properties after accelerated aging, both materials might be suited for long‐term use.