Comparison of influence in enamel during acid etching etching between sodium hypochlorite and acohol dsinfection / 吉林大学学报(医学版)

ABSTRACT

Objective: To investigate the influence of sodium hypochlorite and alcohol disinfection in the enamel during acid etching, and to provide reference for the orthodontic treatment. Methods: Sixty extracted permanent teeth were selected and randomly divided into two groups (group A and group B), with 30 teeth in each group. The teeth in group A were pretreated with 5. 25% sodium hypochlorite and the teeth in group B were pretreated with 75% alcohol. After pretreatment, group Aand group B were randomly divided into three groups (groups A0 , A1, A2, B0, B1, and B2), with 10 teeth in each group and the teeth were etched with 37% phosphoric acid for 0, 15 and 30 s. Forty extracted deciduous teeth were selected and randomly divided into 2 groups (group C and D), with 20 teeth in each group. In group C, the teeth were pretreated with 5. 25% sodium hypochlorite; in group D, the teeth were pretreated with 75% alcohol. After pretreatment, group C and group D were randomly divided into two groups (groups C0 , C1, D0, and D1) with 10 teeth in each group, and the teeth were etched with 37% phosphoric acid for 0 and 30 s. The morphology of enamel was observed by scanning electron microscope (SEM) after the extracted teeth were cleaned with ultrasound; the pore diameters of enamel surface were detected and the shear strength of samples in each group was detected. Results: The differences in pore diameters between various groups were statistically significant (P < 0.01) . In the permanent teeth test group, the pore diameter in group A2 was the maximum (P < 0.01), the surface protein residues were less, and the enamel was fully exposed, and the shear strength was the highest (P < 0.01) . The pore diameter in group B1 was the minimum (P < 0.01), the surface protein residues were more, and the shear strength was the lowest (P < 0.01) . In the deciduous teeth test group, the pore diameter in group CI was the maximum (P < 0.01), the surface protein residues were less, and the shear strength was the highest (P < 0.01) . The pore diameter in group D1 was the minimum, and the surface protein residues were more, and the shear strength was the lowest (P < 0.01) . Conclusion: Compared with the traditional alcohol disinfection method, pretreatment of 5. 2 5 % sodium hypochlorite in tooth enamel for 30 s can significantly increase the surface roughness and cleanliness of enamel, and enhance the shear strength of orthodontic bracket.