School of Dentistry of São José dos Campos - SP, UNESP.
J Appl Oral Sci. 2003 Mar;11(1):61-7. doi: 10.1590/s1678-77572003000100011.
The aim of the present study was to evaluate the effect of thermocycling on the bond strength between the surface of the glass-infiltrated alumina ceramic In-Ceram (VITA) and the Panavia F resin cement (Kuraray CO.). Four 5x6x6mm In-Ceram blocks were obtained. One of the 6x6mm faces of each block was conditioned with Cojet - System (tribochemical silica coating, ESPE-3M) and then luted under a constant 750g pressure with Panavia F cement to another identical face of a resin composit block (Clearfil AP-X, Kuraray) obtained by reproduction of the ceramic one from Express (3M) addition curing silicone impressions. The four sets so formed by ceramic, luting cement and resin have been each one serially sectioned in 20 sticks so that the adhesive surface in each presented 1mm² of area. The samples were divided in 2 groups (n=10): G1- stored for 7 days in deionized water at 36 ± 2ºC; G2 - thermocycled 1500 times between 5 and 55ºC dwell times. The microtensile tests were accomplished in an universal testing machine (EMIC) at a crosshead speed of 0,5 mm/min. The results showed that the mean tensile bond strength values (MPa) for the group G2: (22,815 ± 5,254) had not statistically differ of the values of group G1: (25,628 ± 3,353) (t = 1,427; gl = 18; p-value = 0,171), at the level of a= 5%. It can be concluded that the thermocycling technique used in the present experiment had not produced statistically significant differences between the bond strength results of the specimens obtained by the two used techniques.
本研究旨在评估热循环对玻璃渗透氧化铝陶瓷 In-Ceram（VITA）表面与 Panavia F 树脂水泥（Kuraray CO.）之间粘结强度的影响。共获得 4 个 5x6x6mm 的 In-Ceram 块。每个块的 6x6mm 面之一用 Cojet - System（机械化学硅涂层，ESPE-3M）处理，然后用 Panavia F 水泥在恒定的 750g 压力下将其粘结到通过从 Express（3M）加硫硅橡胶印模复制的相同的树脂复合块（Clearfil AP-X，Kuraray）的另一个相同的面。通过这种方式形成的四个陶瓷、粘结水泥和树脂的组合体分别在 20 个棒上进行连续切片，使得每个棒的粘结面呈现 1mm²的面积。将样本分为 2 组（n=10）：G1- 在 36 ± 2°C 的去离子水中储存 7 天；G2- 在 5 至 55°C 之间进行 1500 次热循环。微拉伸试验在万能试验机（EMIC）上进行，十字头速度为 0.5mm/min。结果表明，G2 组的平均拉伸粘结强度值（MPa）：（22.815±5.254）与 G1 组的强度值（25.628±3.353）没有统计学差异（t=1.427；gl=18；p 值=0.171），置信水平为 a=5%。可以得出结论，在本实验中使用的热循环技术没有对两种使用技术获得的样本的粘结强度结果产生统计学上的显著差异。
