Ngoh E C, Pashley D H, Loushine R J, Weller R N, Kimbrough W F
Department of Endodontics, School of Dentistry, Medical College of Georgia, Augusta 30912, USA.
J Endod. 2001 Jun;27(6):411-4. doi: 10.1097/00004770-200106000-00011.
The purpose of this study was to compare the regional bond strengths of C&B Metabond resin to root canal dentin, with or without treatment using a eugenol-containing endodontic sealer liquid. Eighteen extracted human canines were decoronated at the cementoenamel junction with a slow speed saw. The apical third of the root was removed leaving the cervical and middle dentin. The canal space was then enlarged with files, Gates-Glidden burs, and parapost drills. The teeth were ground on either the mesial or distal sides, permitting direct access to the entire canal. The cervical or middle third dentin was treated with Kerr Root Canal Sealer liquid, alternating between the middle and cervical thirds. Each tooth served as its own control. The adhesive resin was then luted directly to the prepared canal. Specimens, 1 x 1 x 8 mm, were prepared and mounted to a Vitrodyne testing machine enabling microtensile bond strengths to be measured. Data were analyzed using a two-way ANOVA and the least squares means test. The mean microtensile bond strengths for the cervical and middle third dentin treated with eugenol were 13.6 +/- 6.1 MPa (n = 33) and 14.8 +/- 3.9 MPa (n = 29), respectively. Without the eugenol, the mean bond strengths were 18.1 +/- 6.0 MPa (n = 31) and 17.3 +/- 4.6 MPa (n = 31) for the cervical and middle sections. The specimens treated with the eugenol liquid had significantly lower bond strengths than those without eugenol (p < 0.05) only in the cervical third. The region of the tooth tested had no effect on bond strength. That is, bond strength of the cervical third was not significantly different from bond strength on the middle third in either of the two groups (with or without eugenol) tested.
本研究的目的是比较C&B Metabond树脂与根管牙本质之间的局部粘结强度，无论是否使用含丁香酚的根管封闭剂液体进行处理。18颗拔除的人犬齿用慢速锯在牙骨质釉质界处截冠。去除牙根的根尖三分之一，保留颈部和中部牙本质。然后用锉、Gates-Glidden钻和辅助桩钻扩大根管空间。将牙齿在近中或远中面磨平，以便直接进入整个根管。颈部或中部三分之一牙本质用 Kerr根管封闭剂液体处理，在中部和颈部三分之一之间交替进行。每颗牙齿作为自身对照。然后将粘结树脂直接粘结到预备好的根管上。制备1×1×8mm的标本并安装到Vitrodyne试验机上，以测量微拉伸粘结强度。使用双向方差分析和最小二乘均值检验分析数据。用丁香酚处理的颈部和中部三分之一牙本质的平均微拉伸粘结强度分别为13.6±6.1MPa（n = 33）和14.8±3.9MPa（n = 29）。在没有丁香酚的情况下，颈部和中部的平均粘结强度分别为18.1±6.0MPa（n = 31）和17.3±4.6MPa（n = 31）。用丁香酚液体处理的标本仅在颈部三分之一处的粘结强度明显低于未用丁香酚处理的标本（p < 0.05）。测试的牙齿区域对粘结强度没有影响。也就是说，在测试的两组（有或没有丁香酚）中，颈部三分之一的粘结强度与中部三分之一的粘结强度没有显著差异。
