García-Godoy F, Rodríguez M, Barbería E
Department of Pediatric Dentistry, University of Texas Health Science Center at San Antonio 78284-7888, USA.
Am J Dent. 1996 Apr;9(2):80-2.
To evaluate the shear bond strength to dentin of fluoride-releasing materials.
Human, noncarious extracted permanent molars stored in distilled water were used. Flat buccal and lingual dentin surfaces were ground wet on 600-grit silicon carbide paper. The teeth were then distributed at random into three groups of 8 teeth (16 surfaces) each: Group 1: Compoglass; Group 2: Fuji II LC; Group 3: Dyract. Cylindrical samples of the materials were prepared in plastic molds and bonded to the dentin surface according to the manufacturers' instructions. All samples were placed in distilled water for 24 hours, thermocycled for 500 cycles in distilled water at 6 degrees C and 60 degrees C and sheared with an Instron at a crosshead speed of 0.5 mm/minute.
In MPa: Group 1: 16.29 +/- 5.35; Group 2: 15.42 +/- 4.77; Group 3: 15.33 +/- 6.96. ANOVA revealed that there was no statistically significant difference between the groups. Fracture patterns, examined with the SEM, revealed material cohesive failures for all groups.
评估释氟材料与牙本质的剪切粘结强度。
使用储存在蒸馏水中的人非龋性拔除恒牙。在600目碳化硅纸上湿磨平坦的颊侧和舌侧牙本质表面。然后将牙齿随机分为三组，每组8颗牙（16个表面）：第1组：Compoglass；第2组：Fuji II LC；第3组：Dyract。在塑料模具中制备材料的圆柱形样本，并按照制造商的说明粘结到牙本质表面。所有样本置于蒸馏水中24小时，在6℃和60℃的蒸馏水中进行500次热循环，然后用Instron以0.5毫米/分钟的十字头速度进行剪切。
以兆帕计：第1组：16.29±5.35；第2组：15.42±4.77；第3组：15.33±6.96。方差分析显示各组之间无统计学显著差异。用扫描电子显微镜检查的断裂模式显示，所有组均为材料内聚破坏。
