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粘接系统对体外牙本质界面间隙形成的影响。

Influence of adhesive systems on interfacial dentin gap formation in vitro.

作者信息

Loguercio Alessandro Dourado, Reis Alessandra, Bortoli Giana, Patzlaft Rafael, Kenshima Silvia, Rodrigues Filho Leonardo Elóy, Accorinte Maria de Lourdes Rodrigues, van Dijken Jan W V

机构信息

Universidade do Oeste de Santa Catarina, Joaçaba, Brazil.

出版信息

Oper Dent. 2006 Jul-Aug;31(4):431-41. doi: 10.2341/05-53.

DOI:10.2341/05-53

PMID:16924983

Abstract

PURPOSE

This study measured: 1) the interfacial dentin gap formation (IGW) of 2 etch & rinse and 3 self-etch systems with different degrees of acidity and determined the correlation between the smear layer thickness and interfacial gap formation after 1 day and 6 months water storage; 2) the hybrid layer thickness (HLT) produced by the adhesives applied under different smear layer thicknesses.

METHODS AND MATERIALS

Three self-etch adhesives, a mild (Clearfil SE Bond; SE), a moderate (Optibond Solo Plus Self-Etch Primer; SO) and a strong (Tyrian Self Priming Etchant + One Step Plus; TY), and 2 etch & rinse systems (Single Bond; SB and Scotchbond Multi-Purpose Plus; SBMP) were studied. After flat grinding of the occlusal surfaces, 30 molars were sectioned longitudinally in 2 halves. Dentin surfaces with thick and thin smear layers were obtained for each tooth after polishing different sections on 60- and 600-grit SiC paper, respectively. A resin composite (Z250) build-up was made on each tooth section after randomized application of the adhesives. After 24-hour storage in water, resin-dentin bonded sticks (0.8 mm2) were prepared and divided for 1-day and 6-month measurements. The IGW was measured in a stereomicroscope under 400x. SEM micrographs were also made in order to measure the HLT provided by each adhesive.

RESULTS

The thickness of the smear layer did not influence the mean gap width (p>0.05). The etch & rinse systems showed the lowest mean IGW in the 1-day group. Their IGW remained unchanged after 6 months. The self-etch systems showed wider initial IGW, which diminished after 6 months water storage, to sizes similar to the etch & rinse systems. The hybrid layer was thicker when bonded to #60 SiC-treated dentin; however, this difference was only statistically different for the 3-step etch & rinse system (p=0.001). The thickest hybrid layers were observed for the 2 etch & rinse adhesive systems and the thinnest for the mild self-etch. A negative and strong correlation between IGW and HLT was observed for the self-etching adhesive systems tested (r=80.2, p=0.01).

摘要

目的

本研究测量了：1）两种酸蚀冲洗和三种不同酸度的自酸蚀系统的界面牙本质间隙形成（IGW），并确定了在储存1天和6个月后玷污层厚度与界面间隙形成之间的相关性；2）在不同玷污层厚度下应用粘合剂产生的混合层厚度（HLT）。

方法和材料

研究了三种自酸蚀粘合剂，一种轻度（Clearfil SE Bond；SE）、一种中度（Optibond Solo Plus自酸蚀底漆；SO）和一种强度较大的（Tyrian自底漆蚀刻剂+一步法增强型；TY），以及两种酸蚀冲洗系统（Single Bond；SB和Scotchbond多功能增强型；SBMP）。在磨平咬合面后，将30颗磨牙纵向切成两半。分别在60目和600目碳化硅纸上对不同切片进行抛光后，为每颗牙齿获得具有厚和薄玷污层的牙本质表面。在随机应用粘合剂后，在每个牙齿切片上制作树脂复合材料（Z250）堆积。在水中储存24小时后，制备树脂牙本质粘结棒（0.8平方毫米）并分成用于1天和6个月测量的样本。在400倍立体显微镜下测量IGW。还制作了扫描电子显微镜图像，以测量每种粘合剂提供的HLT。

结果

玷污层厚度不影响平均间隙宽度（p>0.05）。酸蚀冲洗系统在1天组中显示出最低的平均IGW。6个月后其IGW保持不变。自酸蚀系统显示出更宽的初始IGW，在储存6个月后减小到与酸蚀冲洗系统相似的尺寸。当与60目碳化硅处理的牙本质粘结时，混合层更厚；然而，这种差异仅在三步酸蚀冲洗系统中具有统计学意义（p = 0.001）。在两种酸蚀冲洗粘合剂系统中观察到最厚的混合层，而轻度自酸蚀的混合层最薄。在所测试的自酸蚀粘合剂系统中，观察到IGW与HLT之间存在负向且强烈的相关性（r = 80.2，p = 0.01）。