三种粘接剂粘接不同牙本质的微拉伸粘接强度比较

Micro-tensile bond strength to sclerotic dentin in non-carious cervical lesions

目的采用微拉伸粘接强度实验测定3种牙本质粘接剂粘接楔状缺损处硬化牙本质的粘接强度。方法选择有典型楔状缺损并因牙周病拔除的上颌前磨牙30颗作为实验组,正常上颌前磨牙30颗作为对照组,使用粘接剂 A(全酸蚀粘接剂 Scotchbond Multi-Purpose)、B(一步法自酸蚀粘接剂 Adper Prompt L-Pop)和 C(两步法自酸蚀粘接剂 Contax)处理硬化牙本质和正常牙本质表面,相应树脂修复。测试两组试件的微拉伸粘接强度。结果粘接剂 A、B、C 粘接硬化牙本质的微拉伸粘接强度分别为46.805 MPa、39.045 MPa、29.852 MPa。粘接剂 A 和 C 与硬化牙本质的微拉伸粘接强度低于正常牙本质,而粘接剂 B 与之相反,差异有统计学意义(P<0.05)。结论牙颈部楔状缺损处硬化牙本质由于结构上的特殊性可造成粘接困难。酸性强有利于粘接剂与硬化牙本质的粘接。

Objective This in vitro study was to evaluate the micro-tensile bond strength （μTBS） of three adhesives to sclerotic dentin in non-carious cervical lesions. Methods The maxillary premolars extracted due to periodontitis and with non-carious cervical lesions were collected. The non-carious, natural cervical sclerotic lesions were bonded with a total-etching adhesive Scotchbond Muhi-Purpose, a two-step self-etching adhesive Contax, and an all-in-one self-etching adhesive Adper Prompt L-Pop. Artificially prepared wedge-shaped lesions were also made in sound premolars and bonded with the same adhesives as the controls. μTBS of these three adhesives was measured. Results μTBS of Scotchbond and Contax to sclerotic dentin was significantly lower than to normal dentin. But μTBS of Adper Prompt L-Pop to normal dentin was significantly lower than to sclerotic dentin. μTBS to sclerotic dentin was Scotchbond 46.805 MPa, Adper Prompt L-Pop 39.045 MPa, and Contax 29. 852 MPa. Conclusions In sclerotic dentin the μTBS was decreased because of the inferior micro-morphology of resin tags. Adhesives with low pH value might bond to sclerotic dentin effectively.