Department of Conservative Dentistry and Fixed Prosthodontics, Mansoura University, Egypt.
J Adhes Dent. 2011 Dec;13(6):561-7. doi: 10.3290/j.jad.a19831.
To evaluate in vitro the influence of different cleaning methods after low-pressure air abrasion on the bond strength of a phosphate monomer-containing luting resin to zirconia ceramic.
A total of 112 zirconia ceramic disks were divided into 7 groups (n = 16). In the test groups, disks were air abraded at low pressure (L) 0.05 MPa using 50-μm alumina particles. Prior to bonding, the disks were ultrasonically (U) cleaned either in isopropanol alcohol (AC), hydrofluoric acid (HF), demineralized water (DW), or tap water (TW), or they were used without ultrasonic cleaning. Disks air abraded at a high (H) pressure of 0.25 MPa and cleaned ultrasonically in isopropanol served as positive control; original (O) milled disks used without air abrasion served as the negative control group. Plexiglas tubes filled with composite resin were bonded with the adhesive luting resin Panavia 21 to the ceramic disks. Prior to testing tensile bond strength (TBS), each main group was further subdivided into 2 subgroups (n=8) which were stored in distilled water either at 37°C for 3 days or for 30 days with 7500 thermal cycles. Statistical analyses were conducted with two- and one-way analyses of variance (ANOVA) and Tukey's HSD test.
Initial tensile bond strength (TBS) ranged from 32.6 to 42.8 MPa. After 30 days storage in water with thermocycling, TBS ranged from 21.9 to 36.3 MPa. Storage in water and thermocycling significantly decreased the TBS of test groups which were not air abraded (p = 0.05) or which were air abraded but cleaned in tap water (p = 0.002), but not the TBS of the other groups (p > 0.05). Also, the TBS of air-abraded groups were significantly higher than the TBS of the original milled (p < 0.01). Cleaning procedures did not significantly affect TBS either after 3 days or 30 days storage in water and thermocycling (p > 0.05).
Air abrasion at 0.05 MPa and ultrasonic cleaning are important factors for improving bonding to zirconia ceramic.
评估低压喷砂后不同清洁方法对含磷酸单体黏结树脂与氧化锆陶瓷黏结强度的影响。
共制备 112 个氧化锆陶瓷圆盘，将其分为 7 组（n=16）。在实验组中，使用 50-μm 氧化铝颗粒对圆盘进行低压（L）0.05 MPa 的喷砂处理。在黏合之前，通过超声处理将圆盘置于异丙醇（AC）、氢氟酸（HF）、去离子水（DW）或自来水（TW）中进行清洗，或不进行超声处理。以 0.25 MPa 高压喷砂并在异丙醇中超声清洗的圆盘作为阳性对照组；原始（O）铣削圆盘不进行喷砂处理作为阴性对照组。将装满复合树脂的有机玻璃管用黏结树脂 Panavia 21 黏合在陶瓷圆盘上。在测试拉伸黏结强度（TBS）之前，每个主组进一步细分为 2 个亚组（n=8），将其分别置于 37°C 的蒸馏水中储存 3 天或 30 天，并进行 7500 次热循环。采用双因素和单因素方差分析（ANOVA）和 Tukey's HSD 检验进行统计学分析。
初始拉伸黏结强度（TBS）范围为 32.6 至 42.8 MPa。经过 30 天在水中储存和热循环后，TBS 范围为 21.9 至 36.3 MPa。未喷砂（p=0.05）或仅喷砂但在自来水中清洗的实验组的 TBS 在储存于水和热循环中后显著降低（p=0.002），而其他组的 TBS 无显著变化（p＞0.05）。此外，喷砂组的 TBS 明显高于原始铣削组的 TBS（p＜0.01）。无论在 3 天还是 30 天的水储存和热循环后，清洁程序对 TBS 均无显著影响（p＞0.05）。
0.05 MPa 的低压喷砂和超声清洗是提高氧化锆陶瓷黏结强度的重要因素。
