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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evaluation of the Bond Strength of Denture Base Resins to Acrylic Resin Teeth: Effect of Thermocycling

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Author(s):
Marra, Julie ; de Souza, Raphael Freitas [1] ; Barbosa, Debora Barros [2] ; Pero, Ana Carolina ; Compagnoni, Marco Antonio [3]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Dept Dent Mat & Prosthodont, Ribeirao Preto Dent Sch, Sao Paulo - Brazil
[2] Sao Paulo State Univ, UNESP, Dept Dent Mat & Prosthodont, Aracatuba Dent Sch, BR-14801903 Sao Paulo - Brazil
[3] Sao Paulo State Univ, UNESP, Dept Dent Mat & Prosthodont, Araraquara Dent Sch, Fac Odontol Araraquara, BR-14801903 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY; v. 18, n. 5, p. 438-443, JUL 2009.
Web of Science Citations: 13
Abstract

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 degrees 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 (alpha = 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. (AU)