Erickson Robert L, De Gee Anton J, Feilzer Albert J
Creighton University School of Dentistry, Omaha, NE, USA.
Dent Mater. 2008 Jan;24(1):117-23. doi: 10.1016/j.dental.2007.03.002. Epub 2007 May 7.
A previous study found that the shear bond strength (SBS) to bovine enamel for the self-etching adhesive Adper Prompt-L-Pop (PLP) was 75% of that found with the etch-and-rinse material SingleBond, while the comparative value for the shear fatigue limit (SFL) was only 58% at 10(5) load cycles. Resin penetration into the enamel surface was substantially less for PLP but it was not conclusive that this was the reason for the lower results cited above. The objective of this study was to determine if pre-etching enamel would substantially improve the SBS and SFL of the PLP adhesive over those found in the previous study.
All test methods were the same as for the previous study. SBS measurements were conducted for composite bonds to bovine enamel using a phosphoric acid pre-etch with the PLP adhesive (PLP-10) and for a conventional enamel-bonding adhesive (EB). Fatigue testing was done with the same test fixtures, load cycling at 2Hz up to a maximum of 10(5) cycles at four selected peak load values between 35 and 60% of the respective bond strengths. Fatigue limits were determined from the data obtained. SEM analysis of resin penetration of the enamel surface was carried out for each adhesive.
A significantly greater SBS and SFL were found for EB (SBS: 30.4MPa; SFL: 15.6MPa) than for PLP-10 (SBS: 20.2MPa; SFL: 9.9MPa). Compared with previously found results, the pre-etching of enamel had no significant improvement in SBS and only slight improvement in SFL. Resin tag penetration of the enamel surface for PLP-10 was similar to that previously found for PLP alone, suggesting that the porosity created by phosphoric acid was effectively removed by the acidic PLP adhesive.
Unlike some self-etching adhesives reported in the literature, pre-etching enamel did not improve the performance of the Prompt-L-Pop adhesive.
先前的一项研究发现，自酸蚀黏结剂Adper Prompt-L-Pop（PLP）与牛牙釉质的剪切黏结强度（SBS）是酸蚀冲洗型材料SingleBond的75%，而在10⁵次加载循环下，其剪切疲劳极限（SFL）的对比值仅为58%。PLP渗入牙釉质表面的树脂量明显较少，但尚不能确定这就是上述较低结果的原因。本研究的目的是确定预酸蚀牙釉质是否会比先前研究中的结果显著提高PLP黏结剂的SBS和SFL。
所有测试方法均与先前研究相同。使用磷酸对牛牙釉质进行预酸蚀后，用PLP黏结剂（PLP-10）以及传统牙釉质黏结剂（EB）进行复合树脂黏结的SBS测量。使用相同的测试装置进行疲劳测试，在2Hz下循环加载，在四个选定的峰值载荷值下，分别为各自黏结强度的35%至60%，最大循环次数为10⁵次。根据获得的数据确定疲劳极限。对每种黏结剂进行牙釉质表面树脂渗入的扫描电子显微镜（SEM）分析。
发现EB的SBS（30.4MPa）和SFL（15.6MPa）显著高于PLP-10（SBS：20.2MPa；SFL：9.9MPa）。与先前的结果相比，牙釉质的预酸蚀对SBS没有显著改善，对SFL仅有轻微改善。PLP-10的牙釉质表面树脂标签渗入情况与先前单独使用PLP时相似，这表明磷酸产生的孔隙被酸性PLP黏结剂有效去除。
与文献中报道的一些自酸蚀黏结剂不同，预酸蚀牙釉质并未改善Prompt-L-Pop黏结剂的性能。
