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Objective:To test the accuracy of Tri Auto ZX electronic apex locator(Morita,Japan)and JustyⅡ electronic canal length meter(TME-601,Yoshida Toei Engineering Company,Japan).Methods:26 root canals were tested in vitro.Electronic canal length(L_E) measurements were recorded with Tri Auto ZX and Justy Ⅱ respectively at the reading "APEX" and "0.5".Under stereoscope the deviation of L_E from the actual working length and degree of accuracy were determined.Results:The average deviation of the measurements obtained by Tri Auto ZX was significantly lower than that by JustyⅡat reading"0.5"(P
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0.05). Conclusion: The PGI 2 level in dental pulp tissue is closely related to the degree of pulp pain.
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Serum sialy transferase(ST) and fucosyltransferase(FT) were determinated in 56 patients with nasopharyngeal or laryngeal carcinoma. 18 healthy were normal control. Serum sialic acid and fucose were also determinated in each sample.Comparison were made statistically among groups of stages of cancer, having metastases or no metastases, before treatment,and recurrence or non-recuurrence after cure Our results suggest that determinations of serum ST, FT, sialic acid and fucose could be used as new-indicators of diagnosis f.or advanced nasopharyngeal or laryngeal cancer and differentiation between recurrence and non-recurrence after treatment. However,the levels of ST in serum could be evaluated for metastases or non-metastases before treatment