自酸蚀剂pH值对正畸托槽剪切粘结强度的影响。
Effect of self-etchant pH on the shear bond strength of orthodontic brackets.
作者信息
Ostby Adam W, Bishara Samir E, Denehy Gerald E, Laffoon John F, Warren John J
机构信息
College of Dentistry, University of Iowa, Iowa City, IA 52242-1001, USA.
出版信息
Am J Orthod Dentofacial Orthop. 2008 Aug;134(2):203-8. doi: 10.1016/j.ajodo.2006.07.039.
INTRODUCTION
Self-etching primers (SEPs) have been used successfully during bonding to reduce technique sensitivity while minimizing the etching of enamel. Although serving the same purpose, SEPs differ in acidity and aggressiveness. Thus, the purpose of this study was to determine whether the pH of SEPs affects the shear bond strength of orthodontic brackets.
METHODS
Forty-five molars were cleaned, mounted, and randomly divided into 3 groups with different SEPs: in group 1 (control), 15 orthodontic brackets were bonded to the teeth with Transbond Plus (3M Unitek, Monrovia, Calif) with a pH of about 1.0; in group 2, 15 brackets were bonded with Adper Prompt L-Pop (3M ESPE, St Paul, Minn) with a pH of 0.9 to 1.0; in group 3, 15 brackets were bonded with Clearfil S3 Bond (Kuraray America, New York, NY), with a pH of 2.7. All teeth were bonded with Transbond XT paste (3M Unitek). The teeth were debonded within half an hour after initial bonding by using a universal testing machine. The residual adhesive on each tooth was evaluated. ANOVA was used to compare the shear bond strength (SBS) of the 3 groups, and the chi-square test was used to compare the adhesive remnant index (ARI) scores for the 3 groups.
RESULTS
ANOVA indicated significant differences between the groups. The Duncan multiple range test indicated that Clearfil S3 Bond produced a significantly stronger mean SBS (6.5 +/- 1.9 MPa) than the Transbond Plus system (mean, 4.2 +/- 1.9 MPa). No significant differences were seen between the SBS of the brackets bonded with Adper (mean, 5.9 +/- 3.4 MPa) and the other 2 groups. The comparisons of the ARI scores between the 3 groups indicated that bracket failure mode was not significantly different.
CONCLUSIONS
The SEP with the highest pH (least acidic), Clearfil S3 Bond, bonded brackets successfully and with the strongest SBS; this suggests that the pH of the SEP is not the primary determinant of the SBS. The clinician should be aware that some SEPs can leave the enamel surface healthier after debonding.
引言
自酸蚀底漆（SEPs）在粘结过程中已成功应用，可降低技术敏感性，同时使牙釉质酸蚀最小化。尽管作用相同，但SEPs在酸度和侵蚀性方面存在差异。因此，本研究的目的是确定SEPs的pH值是否会影响正畸托槽的剪切粘结强度。
方法
45颗磨牙经清洁、安装后，随机分为3组，分别使用不同的SEPs：第1组（对照组），15个正畸托槽用pH值约为1.0的Transbond Plus（3M Unitek，蒙罗维亚，加利福尼亚州）粘结到牙齿上；第2组，15个托槽用pH值为0.9至1.0的Adper Prompt L-Pop（3M ESPE，圣保罗，明尼苏达州）粘结；第3组，15个托槽用pH值为2.7的Clearfil S3 Bond（可乐丽美国公司，纽约，纽约州）粘结。所有牙齿均用Transbond XT糊剂（3M Unitek）粘结。初始粘结后半小时内，使用万能试验机使牙齿脱粘。评估每颗牙齿上的残留粘结剂。采用方差分析比较3组的剪切粘结强度（SBS），采用卡方检验比较3组的粘结剂残留指数（ARI）评分。
结果
方差分析表明各组之间存在显著差异。邓肯多重极差检验表明，Clearfil S3 Bond产生的平均SBS（6.5±1.9 MPa）明显高于Transbond Plus系统（平均值，4.2±1.9 MPa）。用Adper粘结的托槽的SBS（平均值，5.9±3.4 MPa）与其他2组之间未见显著差异。3组之间ARI评分的比较表明，托槽的失败模式无显著差异。
结论
pH值最高（酸性最低）的SEPs，即Clearfil S3 Bond，成功粘结托槽且SBS最强；这表明SEPs的pH值不是SBS的主要决定因素。临床医生应意识到，一些SEPs在脱粘后可使牙釉质表面更健康。
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