Chronic Gingivitis [CLINICAL FEATURES] 纤维增生型 Department of Oral Pathology, Shandong University http://course.sdu.edu.cn/oralhistopath.htmlDepartment of Oral Pathology, Shandong University http://course.sdu.edu.cn/oralhistopath.html 12 [CLINICAL FEATURES] 纤维增生型 Chronic Gingivitis