McGuckin R S, Thurmond B A, Osovitz S
Dental Branch, University of Texas Health Science Center, Houston, 77225.
Am J Dent. 1992 Aug;5(4):216-22.
This study examined the shear bond strengths of enamel bond formed at specific time intervals after the termination of vital bleaching. A total of 160 extracted human anterior teeth were divided into three bleaching treatment (BTx) groups (Superoxol, Proxigel, White & Brite), two bonding agent (BA) subgroups (Scotchbond Dual Cure, Scotchbond 2) and two BA control groups. After BTx for 30 days, bonds were formed at 1, 6 and 24 hours; 3 and 7 days (time interval, TI) post-termination of BTx. A total of 32 groups of n = 5 were used. Bonds were formed in nylon tubes with selected BA and Silux Plus, and ruptured 24 hours later with Instron and cable/loop to measure enamel shear bond strength (SBS). A 3 x 2 x 5 factorial ANOVA and Tukey 95% confidence interval (TCI) detected significant differences between BTx (F = 3.54; TCI = 2.7 MPa), BA (F = 9.73; TCI = 1.8 MPa) and TI (F = 9.39; TCI = 4.1 MPa). The interaction between BTx and TI was slightly significant (F = 2.02); other interactions were not significant. Post-hoc analysis showed 80% of bonds failed at the interface or by mixed cohesive composite/interfacial failure. Scanning electron microscope observations suggested association of increased density of voids in bond area at TI with lowest mean bond strengths. SBS ranged from 42.3 to 106.8% of control.
本研究检测了活髓漂白结束后特定时间间隔形成的釉质粘结剪切强度。总共160颗拔除的人上前牙被分为三个漂白治疗（BTx）组（Superoxol、Proxigel、White & Brite）、两个粘结剂（BA）亚组（Scotchbond Dual Cure、Scotchbond 2）和两个BA对照组。BTx治疗30天后，在BTx结束后的1、6和24小时；3和7天（时间间隔，TI）形成粘结。总共使用了32组，每组n = 5。在尼龙管中用选定的BA和Silux Plus形成粘结，并在24小时后用Instron和电缆/环进行断裂，以测量釉质剪切粘结强度（SBS）。三因素析因方差分析和Tukey 95%置信区间（TCI）检测到BTx（F = 3.54；TCI = 2.7 MPa）、BA（F = 9.73；TCI = 1.8 MPa）和TI（F = 9.39；TCI = 4.1 MPa）之间存在显著差异。BTx和TI之间的相互作用略有显著性（F = 2.02）；其他相互作用不显著。事后分析显示，80%的粘结在界面处或通过混合的内聚性复合/界面破坏而失效。扫描电子显微镜观察表明，TI时粘结区域中空隙密度增加与最低平均粘结强度相关。SBS范围为对照组的42.3%至106.8%。
