Miears J R, Charlton D G, Hermesch C B
Department of General Dentistry (DSG), Dunn Dental Clinic, Wilford Hall USAF Medical Center, Lackland AFB, Texas 78236-5551, USA.
Am J Dent. 1995 Apr;8(2):80-2.
To evaluate the effects of dentin moisture and two different storage times on the shear bond strength of resin composite bonded to dentin with Scotchbond Multi-Purpose Adhesive.
The occlusal surfaces of 60 extracted human molars were reduced to provide flat dentin surfaces. After being hand-finished using wet 400- and 600-grit SiC papers, the teeth were randomly divided into four groups of 15 specimens each. The teeth were etched, rinsed, and then either blotted with gauze which left a visibly moist surface or dried with compressed air. The primer and adhesive were applied according to the manufacturer's instructions and resin composite cylinders were bonded to the teeth. Two of the groups (one moist, one dry) were stored for 24 hours in 37 degrees C distilled water while the other two groups were stored for 90 days in 37 degrees C distilled water. At the end of their storage times, the specimens were loaded to failure in shear at 0.5 mm/minute.
Mean bond strength values and standard deviations in MPa were: Dry dentin at 24 hrs, 13.30 +/- 5.1; Dry dentin at 90 days, 13.07 +/- 3.8; Moist dentin at 24 hours, 13.64 +/- 4.9; Moist dentin at 90 days, 15.58 +/- 5.3. No statistically significant differences were found for bond strengths to dry and to moist dentin for either storage time. Time had no significant effect for either the dry dentin group or the moist dentin group.
评估牙本质湿度和两种不同储存时间对使用Scotchbond多功能粘结剂粘结树脂复合材料与牙本质的剪切粘结强度的影响。
60颗拔除的人类磨牙的咬合面被磨平以提供平坦的牙本质表面。使用湿的400目和600目碳化硅砂纸手工打磨后，牙齿被随机分为四组，每组15个样本。牙齿经过酸蚀、冲洗，然后用纱布吸干使其表面明显湿润，或用压缩空气吹干。按照制造商的说明涂抹底漆和粘结剂，并将树脂复合材料圆柱体粘结到牙齿上。其中两组（一组湿润，一组干燥）在37℃蒸馏水中储存24小时，而另外两组在37℃蒸馏水中储存90天。在储存期结束时，样本以0.5毫米/分钟的速度加载直至剪切破坏。
以MPa为单位的平均粘结强度值和标准差分别为：24小时的干燥牙本质，13.30±5.1；90天的干燥牙本质，13.07±3.8；24小时的湿润牙本质，13.64±4.9；90天的湿润牙本质，15.58±5.3。在任何一个储存时间下，干燥牙本质和湿润牙本质的粘结强度均未发现统计学上的显著差异。时间对干燥牙本质组或湿润牙本质组均无显著影响。
