Long-term Durability of Dentin Bonds Made with a Self-etching Primer, in vivo

Abstract

The long-term durability of bonds between adhesive resins and dentin is of significant importance for the longevity of bonded restorations. We carried out an in vivo one-year study to evaluate the durability of resin-dentin bonds in the oral cavity, as well as to test the hypothesis that the adhesive interface would show morphological changes in vivo over time. Very shallow saucer-shaped dentin cavities were prepared in 12 intact teeth of one Japanese monkey (Macaca fuscata) under general anesthesia. The cavities were restored with Clearfil Liner Bond II and Clearfil Photo Posterior resin composite. The teeth were extracted at three different times: immediately, and 180 and 360 days after placement of the restorations. One day after the monkey was killed, specimens of the three time periods were subjected to the micro-tensile bond test at a crosshead speed of 1 mm/min. The surfaces of the failed bonds were observed under a field emission scanning electron microscope (FE-SEM). Bond strength measurements in this study were successfully performed and were stable at approximately 19 MPa during the one-year testing. Scanning electron microscopic observations of the failed surfaces revealed, at the top of the hybrid layer and within the adhesive resin, porosity which increased over time. Long-term bonds can be assessed in vivo by the combined evaluation of the microtensile bond strength and SEM morphological examination of the adhesive interface.

Deproteinizing effects on resin–tooth bond structures

“…However, marginal discoloration or recurrent caries are frequently found in clinical resin restoration for long-term use. Several in vivo [1][2][3][4] and in vitro studies [5][6][7][8] have shown the degradation mechanism of the bonds. However, information on bond degradation is very limited.…”

Efeito da radioterapia com raios x de alta energia sobre a resistência de união da dentina humana com resina composta – estudo in vitro

“…Neste sentido, o presente estudo foi desenvolvido a fim de analisar o efeito da radiação ionizante na na resistência adesiva entre dentina e resina. Trata-se de uma avaliação de curto prazo, já que as restaurações foram confeccionadas logo após a irradiação dos dentes, e a análise através da resistência de união foi utilizada por ser considerada uma propriedade de fundamental importância para a possível durabilidade das restaurações (24,25).…”

Effects of One-year Storage in Water on Bond Strength of Self-etching Adhesives to Enamel and Dentin

“…Achieving a strong and durable bond between adhesive resins and dental substrates is of critical importance for the longevity of bonded restorations 1) . The introduction of dentin primers has remarkably improved the efficacy of dentin bonding systems 2) .…”

“…The introduction of dentin primers has remarkably improved the efficacy of dentin bonding systems 2) . Self-etching primer systems combine the etching and priming steps into one agent 1) , while all-in-one systems combine the self-etching primer and bonding agent into one application step 3) . Most of the current adhesive materials are capable of achieving high bond strength values shortly after polymerization 4,5) .…”

“…As reported by several researchers, a significant decrease in bond strength after long-term usage may reduce the success rate of restorations, thereby leading to failure. Against this background, it is undoubtedly important to investigate the durability of adhesive systems 1,4,5) . Clearfil SE Bond is received and perceived as one of the most reliable adhesive systems and has been chosen as the reference bonding system in numerous studies 3,4,6,7) .…”