Abstract��OBJECTIVE To optimize the formulation of iodoform paste for root canal filling of deciduous teeth. METHODS Using multi-indicators comprehensive scoring method, which takes the delicate degree, lubricity, difficulty of root canal filling, and difficulty of removal as performance indicators, the matrix type was screened, and the formulation of paste was optimized by orthogonal experimental design. The content of iodoform in the optimized paste was determined by UV spectrophotometry. RESULTS Dimethicone was chosen as the paste matrix by comprehensive scoring of indicators. The results of orthogonal test showed that the ratio of iodoform and zinc oxide was the main factor affecting the performance of the paste, and the optimal formulation of paste was as follows:the ratio of iodoformto zinc oxide 3��7, clove oil 0.5%, and the ratio of powder to liquid 70��30. The linear range of the calibration curve for iodoform in the optimal paste was 48.75-146.22 ��g��mL-1, A=6.781 3C-0.051 6(r=0.999 6); and the average recovery rate was 99.83% (n=9). CONCLUSION The optimal iodoform paste has a simple preparation, fine and smooth for root canal filling of deciduous teeth. The assay method is accurate and reliable for the quality control of iodoform paste.
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2017, Vol. 52 
