Bonding strategy of a universal adhesive system containing chitosan: influence on dentin permeability, and effect on adhesive layer micromorphology.

Henrique Eg Bettiol, Waldemir F Vieira-Junior, Fabiana Mg França, Flávia Lb Amaral, Roberta T Basting
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Abstract

Aim: This study evaluated the influence of chitosan added to a universal adhesive system used in totaletch (TE) or self-etch (SE) mode on dentin permeability, and on the micromorphology of the adhesive layer.

Materials and method: Dentin discs were obtained from human third molars and randomly distributed according to bonding strategy (TE or SE), and to whether or not 1% chitosan (C) was added to a universal adhesive system (Single Bond Universal/3M ESPE), to create the following groups (n=10): TE, TEC, SE, and SEC. Dentin permeability was measured at baseline and after application of dentin treatments. The surface of the adhesive layer (AL) and the dentin adjacent to the AL were examined under a scanning electron microscope.

Results: There were no significant differences in permeability percentage between the groups with and without C (TE and SE versus TEC and SEC) (p>0.05; Mann Whitney test). Dentin permeability was lower when the adhesive system was applied in the SE mode, regardless of the addition of C. The micromorphology of the AL surface showed irregularities, and a greater degree of porosity, when the adhesive system was applied in the SE mode, regardless of chitosan addition. There was a greater depth of penetration of the adhesives into the dentin adjacent to the AL in both the TE and TEC groups. Chitosan added to the adhesive system did not influence dentin permeability.

Conclusions: The self-etch strategy led to lower dentin permeability, and to more irregularities on the surface of the adhesive layer.

Abstract Image

Abstract Image

壳聚糖万能粘结体系的粘结策略:对牙本质渗透性的影响及对粘结层微观形貌的影响。
目的:研究在全蚀(TE)和自蚀(SE)模式下添加壳聚糖对牙本质渗透性和粘接层微观形貌的影响。材料和方法:从人类第三磨牙中取出牙本质盘,根据粘接策略(TE或SE)以及是否在通用粘接系统(Single Bond universal /3M ESPE)中添加1%壳聚糖(C)随机分布,分为以下组(n=10): TE、TEC、SE和SEC。在基线和应用牙本质处理后测量牙本质渗透率。扫描电镜下观察粘附层(AL)表面及与AL相邻的牙本质。结果:加C组与不加C组(TE、SE组与TEC、SEC组)通透率差异无统计学意义(p>0.05;曼-惠特尼试验)。无论是否添加壳聚糖,在SE模式下应用胶黏剂体系时,牙本质渗透性较低。无论是否添加壳聚糖,在SE模式下应用胶黏剂体系时,AL表面的微观形貌表现出不规则性,孔隙度更大。在TE组和TEC组中,粘接剂对临近AL的牙本质的渗透深度都更大。粘接体系中添加壳聚糖对牙本质渗透性无影响。结论:自蚀策略导致牙本质渗透性降低,粘接层表面不规则性增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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