The effect of prime-and-rinse approach using MDP micellar solutions on extrafibrillar demineralization and dentin bond performance |
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Authors: | Zhengyi Zhang Yizhou Zhang Zhifang Wu Ying Shi Zihuai Zhou Zhe Wang Wenxiang Jiang Wenting Wang Jingqiu Xu Baiping Fu |
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Institution: | 1. Department of Prosthodontics, The Affiliated Hospital of Stomatology, School of Stomatology, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China;2. Key Laboratory of Oral Biomedical Research of Zhejiang Province, Hangzhou, Zhejiang, China;3. Department of Pediatric Dentistry, The Affiliated Hospital of Stomatology, School of Stomatology, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China |
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Abstract: | ObjectiveThis study investigated the effects of prime-and-rinse approach using 10-methacryloyloxydecyl dihydrogen phosphate (MDP) micellar solutions on extrafibrillar demineralization and dentin bond performance of etch-and-rinse adhesive.MethodsThe micellar solutions were prepared by adding 15% MDP in two ethanol-aqueous (75:25, 55:45 V/V%) solutions, referring to MDP/EtOH75 and MDP/EtOH55. After mid-coronal dentin surfaces were either etched (control) or conditioned with MDP/EtOH75 and MDP/EtOH55 and rinsed, they were applied with adhesive (Adpter Single Bond 2) in dry- or wet-bonding mode and placed with composite resin (Filtek Z350 XT). They were prepared into multiple micro-beams for micro-tensile bond strengths (MTBS) testing after storage in water for 24 h or subjecting to thermocycling. The other pretreated dentin surfaces were analyzed by TF-XRD, ATR-FTIR, HRTEM, FE-SEM, contact angle measurement and nanoindentation testing. The MTBS data was analyzed with two-way ANOVA followed by LSD post-hoc test.ResultsMDP/EtOH75 produced significantly greater MTBS values than MDP/EtOH55 and control after thermocycling aging in dry- or wet-bonding mode (P < 0.05). The ATR-FTIR spectrums shows that ratios of phosphate/monomer (1,034 cm?1/1,716 cm?1) on MDP/EtOH75-, MDP/EtOH55-treated dentin surfaces are 0.51 and 0.23, respectively. This is confirmed by HRTEM images and SAED pattern that intrafibrillar minerals were mostly preserved after treatment with MDP/EtOH75. MDP/EtOH75 produced significantly higher elastic modulus and nanohardness on pretreated dentin surface than MDP/EtOH55 (P < 0.05). TF-XRD pattern shows some MDP-Ca salts remained on the primed dentin surface.SignificancePrime-and-rinse approach using MDP/EtOH75 micellar solution could produce mostly extrafibrillar demineralization, and greatly increase dentin bond durability in dry- or wet-bonding mode. |
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Keywords: | 10-MDP Prime-and-rinse approach Dry bonding Vesicles Water–ethanol mixture |
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