Gingival Disease o Dental plaque-induced gingival diseases o Non-plaque-induced gIngIval lesions 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 2 Gingival Disease