Alsulaimani Fahad F
Division of Orthodontics, Department of Preventive Dental Science, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.
ISRN Dent. 2014 Mar 17;2014:719608. doi: 10.1155/2014/719608. eCollection 2014.
Objective. To determine the effect of lactic acid at various concentrations on the shear bond strength of orthodontic brackets bonded with the resin adhesive system before and after water storage. Materials and Methods. Hundred extracted human premolars were divided into 5 treatment groups and etched for 30 seconds with one of the following agents: lactic acid solution with (A) 10%, (B) 20%, (C) 30%, and (D) 50%; group E, 37% phosphoric acid (control). Metal brackets were bonded using a Transbond XT. Bonding effectiveness was assessed by shear bond strength after 24 hours and 6 months of water storage at 37°C. The data were analyzed with 2-way analysis of variance and Tukey's Honestly Significant Difference (HSD) test (α = .001). Results. Lactic acid concentration and water storage resulted in significant differences for brackets bond strength (P < .001). 20% lactic acid had significantly higher mean bond strength values (SD) for all conditions: 24 hours [12.2 (.7) MPa] and 6 months [10.1 (.6) MPa] of water storage. 37% phosphoric acid had intermediate bond strength values for all conditions: 24 hours [8.2 (.6) MPa] and 6 months [6.2 (.6) MPa] of water storage. Also, there were differences in bond strength between storage time, with a reduction in values from 24 hours and 6 months for all experimental groups (P < .001). Conclusion. Lactic acid could be used in place of phosphoric acid as an enamel etchant for bonding of orthodontic brackets.
目的。确定不同浓度乳酸对正畸托槽在储水前后与树脂粘接系统粘接的剪切粘结强度的影响。材料与方法。将100颗拔除的人类前磨牙分为5个治疗组，并用以下试剂之一蚀刻30秒：(A)10%、(B)20%、(C)30%和(D)50%的乳酸溶液；E组，37%磷酸（对照组）。使用Transbond XT粘接金属托槽。在37°C储水24小时和6个月后，通过剪切粘结强度评估粘接效果。数据采用双向方差分析和Tukey真实显著差异(HSD)检验进行分析(α = 0.001)。结果。乳酸浓度和储水对托槽粘结强度有显著差异(P < 0.001)。在所有条件下，20%乳酸的平均粘结强度值显著更高：储水24小时[12.2(0.7)MPa]和6个月[10.1(0.6)MPa]。在所有条件下，37%磷酸的粘结强度值处于中间水平：储水24小时[8.2(0.6)MPa]和6个月[6.2(0.6)MPa]。此外，储存时间之间的粘结强度也存在差异，所有实验组的值从24小时到6个月都有所降低(P < 0.001)。结论。乳酸可替代磷酸作为正畸托槽粘接的釉质蚀刻剂。
