Objective:To study the effect of calcium sodium phosphosilicate(CSP)on the enamel remineralization of primary teeth. Methods:30 extracted human healthy primary molars were collected.Each tooth was cut bucco-lingually and mesial-distally into 4 sections.The sections were assigned randomly into 4 groups(n =30).Demineralization and remineralization cyclic model was estab-lished by etching with 35% phosphate acid for 2 min and then treated by unexposure of the sample to nothing(control,group A),so-dium monofluorophosphat(MFP,group B),CSP(group C)and MFP +CSP(group D).The cyclic was repeated twice daily for 30 d. The enamel surface morphology was observed by SEM and the surface microhardness(SMH)was measured.Results:On the tenth day,squamous morphology was observed on the enamel surface of group A and that of group D appeared less demineralization.The SMH value of group D was significant higher than that of group A(P <0.05).On the thirtieth day,obvious demineralization was ob-served in group A.Group B,C and D appeared surface remineralization.The SMH value of group B,C and D was significant higher than that of group A(P <0.05).Highest SMH value was achieved in group D.Conclusion:CSP combined with fluoride is more ef-fective in the enamel remineralization of primary teeth than the single application of them.

Objective: To observe the effect of traditional Chinese medicine foment package in spontaneous heat position pad to prevent lower extremity deep venous thrombosis (LEDVT) during general anesthesia. Methods: From April 2018 to April 2019, 160 cases during general anesthesia were selected and divided into the control group(common hot pad for leg and knee) and the experimental group(self-control position pad for leg and knee) with 80 cases each by the random number table method. The coagulation function and deep venous thrombosis were observed and compared between the two groups. Results: There was no significant difference in coagulation function between the two groups on the 1 day before operation (P > 0.05). The level of D-dimer, prothrombin time, fibrinogen, platelet count on the 5 days after operation was (1.28 ± 0.39) g/L, (11.75 ± 0.81) s, (4.37 ± 0.71) g/L, (203.39 ± 32.12)×10⁹/L in the control group, and (0.96 ± 0.17) g/L, (11.45 ± 0.67) s, (3.93 ± 0.65) g/L, (186.10 ± 34.69)×10⁹/L in the experimental group, and there was significant difference between the two groups (t=2.553-6.728, P <0.01). The incidence of LEDVT on the 5 day after operation was 4%(3/80) in the experimental group and 18% (77/80) in the control group, and there was significant difference between the two groups (χ²=5.005, P<0.05). Conclusions The spontaneous fever knee pad with traditional Chinese medicine foment package can improve the blood coagulation function of general anesthesia patients, and the incidence of LEDVT is lower than that of the control group 5 days after operation.