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Title: 0221 - Effect of Calcium-containing Primer on Bond Strength and Acid Resistance

Authors:

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

Abstract:

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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Student Presenter

Disclosure Statement:
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

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