Cortes O, Garcia-Godoy F, Boj J R
Department of Pediatric Dentistry, University of Texas Health Science Center, San Antonio 78284-7888.
Am J Dent. 1993 Dec;6(6):299-301.
This study evaluated the shear bond strength of resin-reinforced glass ionomers to enamel etched or unetched. Human, non-carious extracted permanent molars stored in distilled water were used. Flat buccal and lingual enamel surfaces were ground wet on 600-grit silicon carbide paper. The teeth were then distributed at random into six groups of 5 teeth (10 surfaces) each: Group 1: Fuji II LC, no enamel etching; Group 2: Fuji II LC, enamel etched with 10% phosphoric acid for 10 seconds; Group 3: Dyract, no enamel etching; Group 4: Dyract, enamel etched with 10% phosphoric acid for 10 seconds; Group 5: Photac-Fil, no enamel etching; Group 6: Photac-Fil, enamel etched with 10% phosphoric acid for 10 seconds. Cylindrical samples of the glass ionomers were prepared in plastic molds and bonded to the enamel surface according to the manufacturers' instructions. All samples were placed in distilled water for 24 hours, and sheared with an Instron at a crosshead speed of 0.5 mm/minute. The results (in MPa) were: Group 1: 11.29 +/- 4.84; Group 2: 19.64 +/- 5.43; Group 3: 8.26 +/- 3.61; Group 4: 22.04 +/- 5.40; Group 5: 2.05 +/- 3.05; Group 6: 9.12 +/- 6.61. ANOVA and Student-Newman-Keuls procedure revealed that on etched enamel, Fuji II LC and Dyract had a significantly higher bond strength than all the other groups tested (P < 0.0001), but not significantly different between each other. With these two groups, cohesive failure within the material was recorded in all samples while in the unetched samples, all specimens displayed an adhesive failure (glass ionomer-enamel interface). All samples with Photac-Fil, with or without enamel etching had adhesive failures.
本研究评估了树脂增强型玻璃离子水门汀与酸蚀或未酸蚀牙釉质之间的剪切粘结强度。使用保存在蒸馏水中的人类非龋性拔除恒牙。在600目碳化硅纸上湿磨平坦的颊侧和舌侧牙釉质表面。然后将牙齿随机分为六组，每组5颗牙（10个表面）：第1组：Fuji II LC，未酸蚀牙釉质；第2组：Fuji II LC，用10%磷酸酸蚀牙釉质10秒；第3组：Dyract，未酸蚀牙釉质；第4组：Dyract，用10%磷酸酸蚀牙釉质10秒；第5组：Photac-Fil，未酸蚀牙釉质；第6组：Photac-Fil，用10%磷酸酸蚀牙釉质10秒。在塑料模具中制备玻璃离子水门汀的圆柱形样本，并根据制造商的说明粘结到牙釉质表面。所有样本置于蒸馏水中24小时，然后用英斯特朗材料试验机以0.5毫米/分钟的十字头速度进行剪切。结果（单位为MPa）如下：第1组：11.29±4.84；第第2组：19.64±5.43；第3组：8.26±3.61；第4组：22.04±5.40；第5组：2.05±3.05；第6组：9.12±6.61。方差分析和Student-Newman-Keuls检验显示，在酸蚀牙釉质上，Fuji II LC和Dyract的粘结强度显著高于所有其他测试组（P<0.0001），但彼此之间无显著差异。对于这两组，所有样本均记录为材料内的内聚破坏，而在未酸蚀样本中，所有标本均表现为粘结破坏（玻璃离子水门汀-牙釉质界面）。所有使用Photac-Fil的样本，无论是否酸蚀牙釉质，均发生粘结破坏。
