Title: 0221 - Effect of Calcium-containing Primer on Bond Strength and Acid Resistance
Yukina Ochiai (Presenter)
Tokyo Medical and dental University
Go Inoue, Tokyo Medical and dental University
Toru Nikaido, Tokyo Medical and dental University
Junji Tagami, Tokyo Medical and dental University
Objectives: The aim of this study was to evaluate the effect of calcium-containing primer on dentin microtensile bond strength (mTBS) and acid resistance of the interface.
Methods: Two primers; Clearfil SE Bond primer (SEP) and an experimental primer containing 10wt/％CaCl2 (CaP), and two adhesives; Clearfil SE Bond adhesive (SEB) and Clearfil Protect Bond adhesive(PBB) (Kuraray Noritake Dental) were used. Total four combinations of the adhesive systems were coded as SEP-SEB, SEP-PBB, CaP-SEB, and CaP-PBB. Human dentin surfaces ground with #600 SiC paper were bonded with one of the adhesive systems and a resin composite was built up. After 24h storage in water, they were subjected to thermal stress for 0 (TC0) and 5000cycles (TC5000). Beam-shaped specimens (1.0×1.0 mm) were prepared for mTBS test. The values were statistically analyzed by two-way ANOVA and T-test with Bonferroni correction.
For morphological examination, the bonded specimens were prepared and subjected to an acid-base challenges (Inoue et Al, 2006) The ABRZ formation at the interface was observed by SEM.
Results: Mean mTBS values (MPa) are shown in the figure. There were no significant differences in mTBS except for CaP-PBB (P<0.05). CaP-PBB demonstrated the lowest mTBSs among the four groups. From the ABRZ observation, CaP-SEB and SEP-PBB created thicker ABRZ than SEP-SEB. CaP-PBB showed the thickest ABRZ.
Conclusions: It was suggested that the two-step self-etch adhesive composed of Ca primer and SE Bond might be the good combination in mTBS and acid resistance.
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The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE