磷酸酸蚀和不同磷酸酯单体预处理牙釉质表面的微观形态学观察和粗糙度评价

Abstract

Abstract: Objective　 To investigate the effects of different phosphoric acid etching time and conditioning with different phosphoric acid ester monomers on the surface roughness and micromorphology of enamel. Methods　 Enamel samples were prepared with 35% phosphoric acid etching for 3, 15, 30 and 60 seconds, respectively. A two-step self-etch adhesive Optibond Versa (OV) primer containing phosphoric acid ester monomer GPDM (glycerol phosphate dimethacrylate) and Tetric N Bond Universal (TNBU) containing phosphoric acid ester monomer 10-MDP (10-Methacryloyloxydecyl dihydrogen phosphate) were used to pretreat enamel surface for 20 seconds. The enamel surface roughness (Ra), were tested by a profilometer and compared with the untreated group (Ctr) and the surface morphology were observed by scanning electron microscope (SEM). Results　The surface roughness obtained by 35% phosphoric acid etching was the highest, followed by OV, TNBU and Ctr (P＜0.05). SEM showed that the enamel-prism dissolved slightly after phosphoric acid etching for 3 seconds, and the typical fish scale-like honeycomb structure was formed after phosphoric acid etching for 15 seconds. With the extension of phosphoric acid etching time, the gaps between the enamel-prisms became more obvious and the enamel-prism structure collapsed. The obvious enamel-prism contours can be observed on the enamel surface treated with OV primer. There was no obvious enamel-prism etching in TNBU, and the scratches were still clear. Conclusions　15 seconds phosphoric acid etching of enamel is recommended. Enamel surface roughness can be increased by phosphoric acid etching and GPDM-containing primer conditioning. GPDM-containing primer achieved higher demineralization depth than that of 10-MDP containing adhesive.

Key words: enamel, phosphoric acid etching time, phosphoric acid ester monomers, micromorphology, surface roughness

CLC Number:

R783.1

References 20

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Micromorphological observation and surface roughness evaluation of enamel surface pretreated by phosphoric acid etching and phosphoric acid ester monomers conditioning

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