Elbanna Asmaa A, El-Toukhy Radwa I, Abbas Mohamed, Zaghloul Nadia M
Assistant Clinical Lecturer, Conservative Dentistry Department, Faculty of Dentistry, Mansoura University, Egypt.
Associate Professor, Conservative Dentistry Department, Faculty of Dentistry, Mansoura University, Egypt.
J Clin Exp Dent. 2024 Mar 1;16(3):e323-e332. doi: 10.4317/jced.61252. eCollection 2024 Mar.
To evaluate the effect of dimethyl sulfoxide (DMSO) primer on microtensile bond strength (μTBS) and the micromorphological pattern of a hydroxyethyl methacrylate (HEMA)-free universal adhesive (UA) applied on wet/dry dentin in etch and rinse (E&R) mode before/after thermomechanical aging.
For the μTBS test, the mid-coronal dentin of 80 human mandibular first molars was exposed and etched with 35% phosphoric acid. Teeth were randomly divided into two equal groups: dry and wet dentin (n = 40). Then, each group was subdivided according to dentin pretreatment by DMSO before UA (Gluma Bond Universal, Heraeus Kulzer, Hanau, Germany) application into unpretreated and 10% DMSO/water (OT Primer S100, OT Oy Dent, Turku, Finland) pretreated (n = 20). Resin composite blocks were built up using a specially designed Teflon mold. In every subgroup, both the μTBS test and failure analysis by stereomicroscope were evaluated immediately after 24 h and after thermomechanical aging (n = 10). The data were statistically analyzed using a three-way analysis of variance (ANOVA) ( = 0.05). For the micromorphological pattern, 16 maxillary first premolars were distributed as mentioned in the μTBS test, prepared, and buccolingually sectioned. The dentin-resin interface was examined using an environmental scanning electron microscope (ESEM) (n = 2).
Three-way ANOVA revealed that the main effects and interactions between dentin wetness, dentin pretreatment, and evaluation time (thermomechanical aging) were not significant for µTBS (> 0.05). Adhesive failure was the predominant type in all immediate and delayed specimens. Longer and more prominent resin tags were observed at dentin-resin interfaces after DMSO application.
Neither the initial dentin wetness condition, dentin pretreatment, nor thermomechanical aging could affect the dentin bond strength. No correlation was found between the bond strength and the micromorphology findings. Wet/dry dentin bonding, Microtensile bond strength, Micromorphology, Universal adhesive, Dimethyl sulfoxide, Thermomechanical aging.
评估二甲基亚砜（DMSO）底漆对在热机械老化前后以酸蚀冲洗（E&R）模式应用于湿/干牙本质的不含甲基丙烯酸羟乙酯（HEMA）的通用粘合剂（UA）的微拉伸粘结强度（μTBS）和微观形态模式的影响。
对于μTBS测试，暴露80颗人下颌第一磨牙的牙冠中部牙本质，并用35%磷酸酸蚀。牙齿随机分为两组，每组40颗：干牙本质组和湿牙本质组。然后，根据在应用UA（德国哈瑙贺利氏古莎公司的Gluma Bond Universal）之前是否用DMSO对牙本质进行预处理，将每组再细分为未预处理组和用10% DMSO/水（芬兰图尔库OT Oy Dent公司的OT Primer S100）预处理组（每组20颗）。使用专门设计的聚四氟乙烯模具构建树脂复合体块。在每个亚组中，分别在24小时后和热机械老化后立即评估μTBS测试和用体视显微镜进行的失败分析（每组10颗）。使用三因素方差分析（ANOVA）（α = 0.05）对数据进行统计学分析。对于微观形态模式，按照μTBS测试中的方法分配16颗上颌第一前磨牙，进行制备并颊舌向切片。使用环境扫描电子显微镜（ESEM）检查牙本质 - 树脂界面（每组2颗）。
三因素方差分析显示，牙本质湿度、牙本质预处理和评估时间（热机械老化）之间的主效应和相互作用对μTBS均无显著影响（P > 0.05）。在所有即时和延迟标本中，粘结失败是主要类型。应用DMSO后，在牙本质 - 树脂界面观察到更长且更突出的树脂突。
初始牙本质湿度条件、牙本质预处理和热机械老化均不会影响牙本质粘结强度。未发现粘结强度与微观形态学结果之间存在相关性。湿/干牙本质粘结、微拉伸粘结强度、微观形态学、通用粘合剂、二甲基亚砜、热机械老化
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