Effects of curing protocol and storage time on the micro-hardness of resin cements used to lute fiber-reinforced resin posts

Autor(es)

Ramos, Marcelo Barbosa ^{[1, 2]} ; Pegoraro, Thiago Amadei ^[3] ; Pegoraro, Luiz Fernando ^[2] ; Carvalho, Ricardo Marins ^[4]

Afiliação do(s) autor(es)

^[1] Univ Fortaleza, Hlth Sci Ctr, Fortaleza, Ceara - Brazil

^[2] Univ Sao Paulo, Bauru Sch Dent, Dept Prosthodont, BR-17012901 Bauru, SP - Brazil

^[3] Univ Sagrado Coracao, Hlth Sci Ctr, Bauru, SP - Brazil

^[4] Canada Director Res, Sch Dent, Vancouver, BC - Canada

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Oral Science; v. 20, n. 5, p. 556-562, SEP-OCT 2012.
• Citações Web of Science: 4

Resumo

Objectives: To determine the micro-hardness profile of two dual cure resin cements (RelyX - U100 (R), 3M-ESPE and Panavia F 2.0 (R), Kuraray) used for cementing fiber-reinforced resin posts (Fibrekor (R) - Jeneric Pentron) under three different curing protocols and two water storage times. Material and methods: Sixty 16mm long bovine incisor roots were endodontically treated and prepared for cementation of the Fibrekor posts. The cements were mixed as instructed, dispensed in the canal, the posts were seated and the curing performed as follows: a) no light activation; b) light-activation immediately after seating the post, and; c) light-activation delayed 5 minutes after seating the post. The teeth were stored in water and retrieved for analysis after 7 days and 3 months. The roots were longitudinally sectioned and the microhardness was determined at the cervical, middle and apical regions along the cement line. The data was analyzed by the three-way ANOVA test (curing mode, storage time and thirds) for each cement. The Tukey test was used for the post-hoc analysis. Results: Light-activation resulted in a significant increase in the microhardness. This was more evident for the cervical region and for the Panavia cement. Storage in water for 3 months caused a reduction of the micro-hardness for both cements. The U100 cement showed less variation in the micro-hardness regardless of the curing protocol and storage time. Conclusions: The micro-hardness of the cements was affected by the curing and storage variables and were material-dependent. (AU)

• Processo FAPESP: 07/02612-2 - Avaliacao da microdureza de dois cimentos resinosos auto-adesivos utilizados na cimentacao de pinos de fibra em diferentes condicoes de polimerizacao.
• Beneficiário: Marcelo Barbosa Ramos
• Modalidade de apoio: Bolsas no Brasil - Mestrado