AIM:To observe the morphology of initial artificial lesions of enamel treated with Chinese
nutgall.METHODS:Using chemical
demineralization models to form
initial enamel lesions,then the enamel blocks were separated into six groups according to random design and treated with 1 mg/mL、10 mg/mL、30 mg/mL Chinese nutgall,~380 mL/L silver diammine fluoride solution
,20 mL/L sodium fluoride and deioned water,respectively.Use a pH cycling model in vitro and SEM observations.RESULTS:The surface of the enamel was covered with densely uniform fingerlike structure after treated with 1 mg/mL、10 mg/mL、30 mg/ml Chinese nutgall and 380 mL/L ~Ag (NH_3)_2F ,the length was from 0.08 μm to 0.6 μm.Group NaF formed different sized globules,the diameter was from ~0.02 μm to 2 μm;Group deioned water formed honeycomb structure.CONCLUSION:The structure of enamel surface treated with 1 mg/mL、10 mg/mL、30 mg/mL Chinese nutgall is similar with 380 mL/L Ag(NH_3)_2F,1 mg/mL may be the effective concentration,but not always the least effective concentration.Compounds in the enamel surface treated with Chinese nutgall may be related to inhibition of demineralization and enhancement of remineralization. <