Mallmann André, de Melo Renata Marques, Estrela Verbênia, Pelogia Fernanda, Campos Laura, Bottino Marco Antonio, Valandro Luiz Felipe
School of Dentistry, Foundation for Science Development, Salvador, BA, Brazil.
J Appl Oral Sci. 2007 Aug;15(4):265-9. doi: 10.1590/s1678-77572007000400005.
To evaluate the bond strength between human dentin and composites, using two light-activated single-bottle total-etch adhesive systems with different pHs combined with chemically activated and light-activated-composites. The tested hypothesis was that the dentin bond strength is not influenced by an adhesive system of low pH, combined with chemically activated or light-activated composites.
Flat dentin surfaces of twenty-eight human third molars were allocated in 4 groups (n=7), depending on the adhesive system: (One Step Plus-OS and Prime & Bond NT-PB) and composite (light-activated Filtek Z-100 [Z100] and chemically activated Bisfil 2B [B2B]). Each adhesive system was applied on acid-etched dentin and then one of the composites was added to form a 5 mm-high resin block. The specimens were stored in tap water (37 degrees C/24 h) and sectioned into two axes, x and y. This was done with a diamond disk under coolant irrigation to obtain beams with a cross-section area of approximately 0.8 mm(2). Each specimen was then attached to a custom-made device and submitted to the microtensile test (1 mm*min-1). Data were analyzed using two-way ANOVA and Tukey's tests (p<0.05).
The anticipated hypothesis was not confirmed (p<0.0001). The bond strengths (MPa) were not statistically different between the two adhesive systems when light-activated composite was used (OS+Z100 = 24.7+/-7.1 feminine; PB+Z100 = 23.8+/-5.7 feminine). However, with use of the chemically activated composite (B2B), PB (7.8+/-3.6b MPa) showed significantly lower dentin bond strengths than OS (32.2+/-7.6 feminine).
The low pH of the adhesive system can affect the bond of chemically activated composite to dentin. On the other hand, under the present conditions, the low pH did not seem to affect the bond of light-activated composites to dentin significantly.
使用两种具有不同pH值的光固化单瓶装全酸蚀粘结系统，并结合化学固化和光固化复合材料，评估人牙本质与复合材料之间的粘结强度。所测试的假设是，低pH值的粘结系统与化学固化或光固化复合材料结合使用时，牙本质粘结强度不受影响。
根据粘结系统（一步法加强型粘结剂[One Step Plus - OS]和全酸蚀粘结剂[Prime & Bond NT - PB]）以及复合材料（光固化的Filtek Z - 100[Z100]和化学固化的Bisfil 2B[B2B]），将28颗人第三磨牙的平坦牙本质表面分为4组（每组n = 7）。每种粘结系统应用于酸蚀后的牙本质，然后添加其中一种复合材料以形成5毫米高的树脂块。将标本置于自来水（37℃/24小时）中保存，并沿x和y两个轴进行切片。使用金刚石圆盘在冷却液冲洗下进行切片，以获得横截面积约为0.8平方毫米的梁。然后将每个标本连接到定制装置上，并进行微拉伸试验（1毫米/分钟）。使用双向方差分析和Tukey检验（p<0.05）对数据进行分析。
预期假设未得到证实（p<0.0001）。当使用光固化复合材料时，两种粘结系统之间的粘结强度（MPa）在统计学上没有差异（OS + Z100 = 24.7±7.1；PB + Z100 = 23.8±5.7）。然而，使用化学固化复合材料（B2B）时，PB（7.8±3.6b MPa）显示出比OS（32.2±7.6）显著更低的牙本质粘结强度。
粘结系统的低pH值会影响化学固化复合材料与牙本质的粘结。另一方面，在当前条件下，低pH值似乎并未显著影响光固化复合材料与牙本质的粘结。
