group N.Inter-group analysis revealed higher osteoclast numbers in the inflammatory area of group DP and group P when compared with group N(P

It has become a vital question to find out the approaches of stomatological course system to meet the demands of modern times.By analyzing the characteristics of stomatological courses systems at home and abroad, the author found out the differences,which was helpful the to optimize the courses system of stomatology education.

The paper summed up the experiences of course system reform and set forth how to optimize the course system of stomatology education to cultivate the practical abilities of stomatology undergraduates intensively.

Objective To investigate the role of nitric oxide(NO)in the pathogenesis of periodontal diseases by detecting and analyzing NO level in gingival tissue in experimental animal model of periodontitis.Methods Experimental animal model of periodontitis in rats was built.Then NO2-and NO3-concentrations,which reflect NO level indirectly,were measured by NO kit in gingival tissue of rat with experimental periodontitis.Results The significant differences of NO level in gingival tissue were found among normal group,gingivitis group and periodontitis group(P