Effect of an MDP-based Cleaner on Adhesion to Dentin Contaminated with a Temporary Luting Cement

抄録

 Purpose: The aim of this study was to investigate the effect of temporary luting cement removal using a new 10-methacryloyloxydecyl dihydrogen phosphate (MDP) -based cleaner (KATANA Cleaner) on the dentin adhesion of a resin cement.

 Methods: Intact human dentin was ground with 600-grit SiC paper and divided into three groups. The first group was left untreated with the temporary cement (Con). For the other groups, dentin surfaces were covered with a temporary luting cement (Temporary Hard) and stored in water for one week. The temporary luting cement was removed using an ultrasonic scaler (US), and then treated with KATANA Cleaner for 10 s (KC). A resin composite block (KATANA Avencia Block) was bonded to the dentin using a resin cement (Panavia V5). The specimens were immersed in water for 24 h then cut into beams. These were subjected to thermal cycling stress for 0 cycles (TC0) or 5,000 cycles (TC5000). A microtensile bond strength test was performed at a crosshead speed of 1 mm/min. Data were statistically analyzed with two-way ANOVA and t-test with Bonferroni correction at a significance of 5%. The fractured specimens after debonding were examined using scanning electron microscopy and electron diffraction spectroscopy.

 Results: No significant differences were noted in microtensile bond strengths between Con-TC0 and KC-TC0, between KC-TC0 and KC-TC5000 and between Con-TC5000 and US-TC0. The temporary luting cement covered the dentin surface in the US group, and partially remained in the KC group. Energy-dispersive X-ray spectrometric analysis revealed a distinct Zn peak in the US group, while the peak was significantly decreased in the KC group.

 Conclusion: The combined method with an ultrasonic scaler and the MDP-based cleaner effectively removed temporary luting cement contaminants on dentin surfaces, thus securing durable bonding of a resin cement to dentin used for indirect restorations.