Effect of Long-term Simulated Pulpal Pressure on the Bond Strength and Nano leakage of Resin-luting Agents With Different Bonding Strategies

Autor(es)

de Alexandre, R. S. ^{[1, 2]} ; Santana, V. B. ^[1] ; Kasaz, A. C. ^[3] ; Arrais, C. A. G. ^[4] ; Rodrigues, J. A. ^[1] ; Reis, A. F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Guarulhos, Dept Operat Dent, Sao Paulo - Brazil

^[2] Univ North Sao Paulo, Sao Paulo - Brazil

^[3] Univ Guarulhos, Sao Paulo - Brazil

^[4] Univ Estadual Ponta Grossa, Dept Operat Dent, Ponta Grossa, Parana - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Operative Dentistry; v. 39, n. 5, p. 508-520, SEP-OCT 2014.
• Citações Web of Science: 5

Resumo

This study evaluated the effects of simulated hydrostatic pulpal pressure (SPP) on the microtensile bond strength (mu TBS) to dentin and nanoleakage patterns produced by self-adhesive luting agents after 12 months. Three self-adhesive luting agents (RelyX Unicem {[}UN], RelyX U100 {[}UC], and Clearfil SA Luting {[}SA]) and three conventional luting agents (Rely X ARC {[}RX], Panavia F {[}PF], and a two-step self-etching adhesive system {[}Clearfil SE Bond] associated with Panavia F {[}PS]) were evaluated. One hundred twenty-three human molars were abraded to expose occlusal surfaces. Resin cements were used to lute cylindrical composite blocks to the teeth either subjected or not to SPP. Sixty specimens were subjected to 15 cm 1120 of SPP for 24 hours before and 24 hours or 12 months after cementation procedures. Afterward, restored teeth were serially sectioned into beams with a cross-sectional area of 1 mm(2) at the bonded interface and were tested in tension (cross-head speed of 1 mm/min). Failure mode was determined using scanning electron microscopy (SEM). Data were statistically analyzed by three-way analysis of variance and post hoc Tukey test (p=0.05). Two additional teeth in each group were serially sectioned into 0.9-mm-thick slabs, which were submitted to a nanoleakage protocol with AgNO3 and analyzed with scanning and transmission electron microscopes. The mu TBS values of the etch-and-rinse group (RX) were negatively influenced by SPP and long-term water storage with SPP. After 12 months, UC and SA presented premature failures in all specimens when submitted to SPP. SPP increased silver deposition in most groups in both evaluation times. The hydrostatic pulpal pressure effect was material dependent. The storage time without SPP did not affect bond strength. However, long-term SPP influenced the performance of the etch-and-rinse and self-adhesive cements regarding mu TBS and nanoleakage pattern, except to UN. (AU)

• Processo FAPESP: 08/05179-0 - Efeito da pressão pulpar interna na resistência de união e nanoinfiltração das interfaces de união resina-dentina produzidas por cimentos auto-adesivos ao longo do tempo: um estudo in vitro
• Beneficiário: Rodrigo Sversut de Alexandre
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 09/16261-2 - Efeito da pressão pulpar interna na resistência de união e nanoinfiltração das interfaces de união resina-dentina produzidas por cimentos auto-adesivos ao longo do tempo: um estudo in vitro
• Beneficiário: André Figueiredo Reis
• Modalidade de apoio: Auxílio à Pesquisa - Regular