喷磨预处理对离体氟斑牙正畸托槽粘接强度的影响

Experimental Investigation of Shear Bond Strength on Orthodontic Bonding on Dental Fluorosis after Air Abrading Surface Preparation Technique

目的筛选一种使氟斑牙与托槽有较高粘接强度的临床可行的粘接方法。方法选择15例氟斑牙正畸患者拔除的60颗第一前磨牙为研究对象,采用随机区组设计方法分为15个区组,每区组包括每位患者的4颗牙齿,区组内采用随机排列表法分为A、B、C、D4小组,每小组即包括每位患者的1颗牙齿,共计15颗。4小组采用不同方法粘接托槽,分别为常规酸蚀后用釉质粘接剂粘接、喷磨预处理后用釉质粘接剂粘接、自酸蚀后用Bond粘接剂和光固化复合树脂粘接、喷磨预处理和自酸蚀后用树脂粘接剂和光固化复合树脂粘接;然后测定4小组的粘接强度和托槽底面粘接剂的余留情况。结果A、B、C、D4小组的托槽/牙面剪切强度测试结果分别为(2.247±0.261)MPa、(5.374±0.469)MPa、(4.345±0.401)MPa、(5.791±0.636)MPa,4组间存在统计学差异(P<0.01),D组剪切强度最大,其次为B、C组,A组最小。4组样本在去除托槽时残留粘接剂的情况无统计学差异(P>0.05)。结论氟斑牙面先用空气喷磨机喷磨,然后进行自酸蚀和树脂粘接托槽是一种较为可行的方法。

Objective To find a way to having higher bond strength on mottled enamel. Methods Sixty mottled enamel first bicuspid teeth extracted from fifteen patients needing orthodontic force were prepared and divided into four groups. Group A was routine acid etched, group B was air abraded, group C was etched by clearfil liner serf-etching primer, group D was air abraded and then etched by clearfil liner self-etching primer. Next the bond and resin were used. The shear bond strength was observed and compared. The data were analysed by SPSS 11.5 statistical package. Results The shear bonding strength of group A was（2.247±0.261） MPa, group B was （5.374±0.469） MPa, group C was（4.345±0.401） MPa, group D was（5.791±0.636） MPa. The strengths of four groups were significantly different （P〈0.01）. The adhesive remnant index （ARI） scores of the four groups had no significant difference. Conclusion In clinic, using air abrasion surface preparation technique is an acceptable way to enhancing the shear bond strength before sticking the orthodontic bonding on dental fluorosis.