Sharafeddin Farahnaz, Nouri Hossein, Koohpeima Fatemeh
Dept. of Operative Dentistry, Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Undergraduate student, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
J Dent (Shiraz). 2015 Mar;16(1):10-6.
Monomer viscosity and solvent evaporation can be affected by the adhesive system temperature. Higher temperature can elevate the vapor pressure in solution and penetration of adhesive in smear layer. Bonding mechanism may be influenced by the adhesive temperature.
This study aimed to evaluate the effect of pre-heating on shear bond strength of etch-and-rinse and self-etching adhesives to ground bovine dentin surfaces, at temperatures of 4˚C, 25˚C and 40˚C.
In this experimental study, 60 maxillary bovine incisors were randomly divided into 6 groups (n=10). The central part of labial dentin surfaces was exposed with a diamond bur and standardized smear layer was created by using silicon carbide paper (600 grit) under water-coolant while the specimens were mounted in acrylic resin. Two adhesive systems, an etch-and-rinse (Adper single bond) and a self-etch (Clearfil SE Bond) were stored at temperatures of 4˚C, 25˚C and 40˚C for 30 minutes and were then applied on the prepared labial surface according to the manufacturer's instructions. The composite resin (Z350) was packed in Teflon mold (5 mm in diameter) on this surface and was cured. The shear bond strength (MPa) was evaluated by universal testing machine (Zwick/Roell Z020, Germany) at cross head speed of 1mm/min. The results were statistically analyzed by using ANOVA and Tukey tests (p< 0.05).
No significant difference was found between the shear bond strength of Clearfil SE Bond adhesive in different temperature and single Bond adhesive system at 25 ˚C and 40 ˚C. However, there were significant differences between 4 ˚C of Adper single bond in comparison with 25˚C and 40˚C (p= 0.0001).
Pre-heating did not affect the shear bond strength of SE Bond, but could promote the shear bond strength of Adper Single Bond.
单体粘度和溶剂蒸发会受到粘结剂系统温度的影响。较高的温度会提高溶液中的蒸气压以及粘结剂在玷污层中的渗透。粘结机制可能会受到粘结剂温度的影响。
本研究旨在评估在4˚C、25˚C和40˚C温度下，预热对酸蚀冲洗粘结剂和自酸蚀粘结剂与磨除的牛牙本质表面之间剪切粘结强度的影响。
在本实验研究中，60颗上颌牛切牙被随机分为6组（n = 10）。用金刚砂车针暴露唇面牙本质的中央部分，并在水冷条件下使用碳化硅砂纸（600目）制作标准化的玷污层，同时将标本固定在丙烯酸树脂中。两种粘结剂系统，一种酸蚀冲洗粘结剂（Adper single bond）和一种自酸蚀粘结剂（Clearfil SE Bond），分别在4˚C、25˚C和40˚C温度下储存30分钟，然后按照制造商的说明应用于制备好的唇面。将复合树脂（Z350）填充在该表面的聚四氟乙烯模具（直径5mm）中并固化。通过万能试验机（德国Zwick/Roell Z020）以1mm/min的十字头速度评估剪切粘结强度（MPa）。结果采用方差分析和Tukey检验进行统计学分析（p < 0.05）。
Clearfil SE Bond粘结剂在不同温度下的剪切粘结强度与25˚C和40˚C时的Adper single bond粘结剂系统之间未发现显著差异。然而，4˚C时的Adper single bond与25˚C和40˚C相比存在显著差异（p = 0.0001）。
预热不影响SE Bond的剪切粘结强度，但可提高Adper Single Bond的剪切粘结强度。
