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

Autor(es)

Marra, Julie ; de Souza, Raphael Freitas ^[1] ; Barbosa, Debora Barros ^[2] ; Pero, Ana Carolina ; Compagnoni, Marco Antonio ^[3]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY; v. 18, n. 5, p. 438-443, JUL 2009.
• Citações Web of Science: 13

Resumo

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)

• Processo FAPESP: 04/07855-2 - Efeito da termociclagem na resistencia de uniao entre dente artificial e resina acrilica para base proteica.
• Beneficiário: Marco Antonio Compagnoni
• Modalidade de apoio: Auxílio à Pesquisa - Regular