不同类型牙本质保护膜对牙本质粘接性能的影响

Objective: To investigate the effects of three different types of dentin protective membranes (HyC, SBU and S3) on dentin adhesive properties. Methods: Fresh isolated molar teeth were collected, and smooth dentin surface was obtained after embedding, cutting and polishing. In the control group, dentin protective membrane was not applied, while the remaining three groups were coated with three different types of dentin protective membranes, and the preformed resin prosthesis was cemented with resin cement. A strip dentin-resin sample with a cross-sectional area of 0.9 mm×0.9 mm was obtained by a precision cutting machine. The tensile force was tested at the loading speed of 0.5 mm/min with a universal testing machine until the dentin-resin strip was broken. The maximum tensile force during the loading process was automatically recorded by the computer, and the microstructure and fracture mode of the section were observed by a scanning electron microscope. Results: After coating dentin protective membranes, the tensile strength of each experimental group was significantly increased compared with that of the control group (P<0.05), and the tensile strength of group HyC was significantly smaller than that of group SBU and group S3 (P<0.05). The tensile fracture mode shown by microstructure observation was mainly interfacial failure. Conclusion: Different types of dentin protective membranes can increase the adhesive properties between dentin and resin prosthesis. SBU and S3 can improve the adhesion strength more significantly than HyC.