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Evaluation of the Bond Strength of Denture Base Resins to Acrylic Resin Teeth: Effect of Thermocycling
Author(s) -
Marra Juliê,
De Souza Raphael Freitas,
Barbosa Debora Barros,
Pero Ana Carolina,
Compagi Marco Antonio
Publication year - 2009
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.2009.00478.x
Subject(s) - acrylic resin , universal testing machine , materials science , bond strength , statistical analysis , post hoc , composite material , dentistry , mathematics , ultimate tensile strength , medicine , adhesive , statistics , layer (electronics) , coating
Purpose: The purpose of this study was to evaluate the thermocycling effects and shear bond strength of acrylic resin teeth to denture base resins. Materials and Methods: Three acrylic teeth (Biotone, Trilux, Ivoclar) were chosen for bonding to four denture base resins: microwave‐polymerized (Acron MC), heat‐polymerized (Lucitone 550 and QC‐20), and light‐polymerized (Versyo.bond). Twenty specimens were produced for each denture base/acrylic tooth combination and were divided into two groups (n = 10): without thermocycling (control groups) and thermocycled groups submitted to 5000 cycles between 4 and 60°C. Shear strength tests (MPa) were performed with a universal testing machine at a crosshead speed of 1 mm/min. Statistical analysis of the results was carried out with three‐way ANOVA and Bonferroni's multiple comparisons post hoc analysis for test groups (α= 0.05). Results: The shear bond strengths of Lucitone/Biotone, Lucitone/Trilux, and Versyo/Ivoclar specimens were significantly decreased by thermocycling, compared with the corresponding control groups ( p < 0.05). The means of Acron/Ivoclar and Lucitone/Ivoclar specimens increased after thermocycling ( p < 0.05). The highest mean shear bond strength value was observed with Lucitone/Biotone in the control group (14.54 MPa) and the lowest with QC‐20/Trilux in the thermocycled group (3.69 MPa). Conclusion: Some acrylic tooth/denture base resin combinations can be more affected by thermocycling; effects vary based upon the materials used.