Relining of prosthesis with auto-polymerizing hard denture reline resins: effect of post-polymerization treatment on flexural strength

Autor(es)

Ferreira Koyama Takahashi, Jessica Mie ^[1] ; Machado, Fernanda Miranda ^[1] ; Costa Nunez, Juliana Maria ^[1] ; Xediek Consani, Rafael Leonardo ^[1] ; Mesquita, Marcelo Ferraz ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Dept Prosthodont & Periodont, Piracicaba Dent Sch, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: GERODONTOLOGY; v. 26, n. 3, p. 232-236, SEP 2009.
• Citações Web of Science: 3

Resumo

Background: It has been suggested that microwave irradiation and prosthesis immersion in hot water after its polymerization may improve mechanical and viscoelastic properties of acrylic resins. Purpose: This study was proposed to verify the influence of microwave post-polymerization (PP) treatment over the flexural strength of thermo-polymerizing acrylic resin specimens (QC-20) relined or not with two different composition hard chairside auto-polymerizing reliners {[}Kooliner (K) and New Truliner (NT)]. Materials and Methods: For this study, 50 specimens of 64 x 10 x 3.3 mm were polymerized and distributed into five groups. G1 (control) specimens without relining and PP; G2 specimens relined with K, without PP; G3 specimens relined with NT, without PP; G4 specimens relined with K, with PP (microwave irradiation with 650 W for 5 min); G5 specimens relined with NT, with PP. Tests were performed on a universal testing machine Instron 4411 with compression speed of 5 mm/min. Results: Specimens of K without PP did not show statistically different results (p < 0.05) when compared with control. However, when submitted to PP these specimens showed a significant increase in flexural strength. Specimens of NT showed the lowest flexural strength of all groups, with or without PP when compared with control and K groups. Conclusion: Microwave PP (650 W for 5 min) proved to be an effective method of improving the flexural strength of K relined prosthesis. However, it did not seem to affect NT specimens. (AU)

• Processo FAPESP: 06/61681-1 - Reembasamento direto sobre resina acrílica para base de próteses utilizando reembasadores rígidos: efeito da pós polimerização sobre as propriedades de resistência à tração e à flexão
• Beneficiário: Fernanda Miranda Machado
• Linha de fomento: Bolsas no Brasil - Iniciação Científica