Yazici A Ruya, Karaman Emel, Ertan Atila, Ozgunaltay Gul, Dayangac Berrin
Department of Conservative Dentistry, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
J Contemp Dent Pract. 2009 Jan 1;10(1):41-8.
The aim of this in vitro study was to evaluate the shear bond strength of a one-step self-etch adhesive to dentin pretreated with phosphoric acid, air abrasion, or laser.
Fifty-six extracted non-carious human mandibular molars were mounted and the occlusal surfaces ground with a mechanical grinder to obtain flat occlusal dentin surfaces. The teeth were randomly divided into four groups of 14 teeth according to the different dentin surface pretreatment methods: Group I--acid, Group II--laser, Group III--air abrasion, Group IV (control)--no surface treatment. After applying a one-step self-etch adhesive system, Futura Bond NR, cylinders of Z250 composite resin were bonded to the dentin surfaces by transparent gelatin capsules (2.5 mm diameter; 3 mm high) and then polymerized. All specimens were stored in distilled water at 37 masculineC for 24 hours. Shear bond testing was carried out using an Universal testing machine with a crosshead speed of 0.5 mm/sec. Data were analyzed using the Kruskal Wallis and Mann-Whitney tests at a significance level of 0.05.
The bond strength of air abrasion (Group III) and the control group (Group IV) were statistically higher than both the acid (Group I) and laser (Group II) pretreatments (p < 0.05). No statistically significant differences were found in shear bond strength between surfaces treated with air abrasion and the control group (p > 0.05). Surfaces pretreated with laser (Group II) resulted in the lowest bond strength which was not statistically different from those pretreated with acid (Group I) (p > 0.05).
Surfaces pretreated with acid and laser adversely affected the bond strength of a one-step self-etch adhesive, Futura Bond NR, while pretreatment with air abrasion had no effect on bond strength.
The pretreatment of dentin surfaces prior to self-etch adhesive seems to be unnecessary and defeats the original purpose of these systems.
本体外研究旨在评估一步法自酸蚀粘结剂与经磷酸酸蚀、空气喷砂或激光处理的牙本质之间的剪切粘结强度。
选取56颗拔除的无龋人类下颌磨牙，固定后用机械磨头磨除咬合面，以获得平整的咬合面牙本质表面。根据不同的牙本质表面预处理方法，将牙齿随机分为四组，每组14颗：第一组——酸蚀组，第二组——激光组，第三组——空气喷砂组，第四组（对照组）——未进行表面处理。应用一步法自酸蚀粘结系统Futura Bond NR后，通过透明明胶胶囊（直径2.5 mm；高3 mm）将Z250复合树脂圆柱体粘结到牙本质表面，然后进行聚合。所有标本在37℃蒸馏水中储存24小时。使用万能试验机以0.5 mm/秒的十字头速度进行剪切粘结测试。数据采用Kruskal Wallis检验和Mann-Whitney检验进行分析，显著性水平为0.05。
空气喷砂组（第三组）和对照组（第四组）的粘结强度在统计学上高于酸蚀组（第一组）和激光组（第二组）预处理（p < 0.05）。空气喷砂处理组与对照组之间的剪切粘结强度无统计学显著差异（p > 0.05）。激光预处理组（第二组）的粘结强度最低，与酸蚀预处理组（第一组）无统计学差异（p > 0.05）。
酸蚀和激光预处理表面对一步法自酸蚀粘结剂Futura Bond NR的粘结强度有不利影响，而空气喷砂预处理对粘结强度无影响。
在使用自酸蚀粘结剂之前对牙本质表面进行预处理似乎没有必要，且违背了这些系统的初衷。
