Objective To investigate the morphological changes of enamel and dentin abrased with air-abrasion cavity preparation(KCP). Methods The teeth surfaces were abrased under different ain pressures and with variant particle sizes, then bonded with composite resin. The morphological changes on the abrased surfaces of the teeth and on the corresponding surfaces of the resin left after the teeth were dissolved by acid were observed under SEM. Results The surfaces of enamel and dentin demonstrated... Objective To investigate the morphological changes of enamel and dentin abrased with air-abrasion cavity preparation(KCP). Methods The teeth surfaces were abrased under different ain pressures and with variant particle sizes, then bonded with composite resin. The morphological changes on the abrased surfaces of the teeth and on the corresponding surfaces of the resin left after the teeth were dissolved by acid were observed under SEM. Results The surfaces of enamel and dentin demonstrated dense and irregular concave and convex structure; composite resin penetrated into the hollows, forming lots of resin tags. Parameters of 50μm size particles at 120-160 psi(for enamel) and 100-120 psi(for dentin) were the best for use. Conclusion The results of this study suggested that KCP can excavate dental surfaces effectively and can be used in preparing bonding surfaces of enamel and dentin in lieu of acid etching. |