J Adhes Dent. 2018;20(2):113-120. doi: 10.3290/j.jad.a40307.
To determine the microtensile bond strength (µTBS) of two 2-step self-etch adhesives (SEAs) to bur-cut and uncut enamel.
The buccal and lingual enamel surfaces of 15 teeth were ground flat ("bur-cut" enamel), while the enamel surface of another set of 15 teeth was solely prophylactically cleaned ("uncut" enamel). Resin composite was bonded to the surfaces using the GPDM-based SEA OptiBond XTR (Kerr), the 10-MDP-based SEA Clearfil SE Bond (Kuraray Noritake), or the 3-step etch-and-rinse adhesive (E&RA) OptiBond FL (Kerr) that served as the gold-standard control. After 1-week water storage at 37°C, specimens were serially cut into 1-mm2 stick-shaped microspecimens, of which half per tooth were further subjected to 20,000 thermocycles (TC) prior to µTBS testing. Data were statistically analyzed using ANOVA and the post-hoc Tukey test. The interfacial ultrastructure of the GPDM-based SEA OptiBond XTR with uncut and bur-cut enamel was additionally characterized with transmission electron microscopy (TEM).
After 1-week water storage and upon TC aging, both SEAs bonded significantly (p < 0.05) less effectively to both bur-cut and uncut enamel than did the control OptiBond FL, except when OptiBond XTR was bonded to bur-cut enamel; then a similarly high µTBS was recorded (p > 0.05). TEM interfacial characterization revealed a tight interaction of Optibond XTR with both bur-cut and uncut enamel.
The best bonding efficacy to enamel is still achieved by etching with phosphoric acid, following an E&R approach, while the higher etching efficacy of the GPDM-based SEA may result in equally effective bonding, provided that the enamel is bur-roughened first.
确定两种 2 步自酸蚀粘结剂（SEAs）对切割和未切割釉质的微拉伸粘结强度（µTBS）。
15 颗牙齿的颊舌面釉质被磨平（“切割釉质”），而另一组 15 颗牙齿的釉质仅进行预防性清洁（“未切割釉质”）。使用基于 GPDM 的 SEA OptiBond XTR（ Kerr）、基于 10-MDP 的 SEA Clearfil SE Bond（ Kuraray Noritake）或作为金标准对照的 3 步酸蚀-冲洗粘结剂（E&RA）OptiBond FL（ Kerr）将树脂复合材料粘结到表面。在 37°C 下储存 1 周后，将标本依次切割成 1-mm2 棒状微标本，每颗牙齿的一半进一步在 20,000 次热循环（TC）后进行 µTBS 测试。使用方差分析和事后 Tukey 检验对数据进行统计分析。使用透射电子显微镜（TEM）进一步表征基于 GPDM 的 SEA OptiBond XTR 与未切割和切割釉质的界面超微结构。
在 1 周水储存和 TC 老化后，两种 SEAs 与对照 OptiBond FL 相比，与切割和未切割釉质的粘结效果均显著降低（p < 0.05），但 OptiBond XTR 粘结在切割釉质时除外；然后记录到相似高的 µTBS（p > 0.05）。TEM 界面特征表明 OptiBond XTR 与切割和未切割釉质紧密相互作用。
通过磷酸蚀刻，然后采用 E&R 方法，仍然可以实现对釉质的最佳粘结效果，而基于 GPDM 的 SEA 的更高蚀刻效果可能会导致同样有效的粘结，前提是首先对釉质进行切割粗糙化处理。
