Effects of Occlusal Trauma and Gingival Inflammation on the Healing of Artificial Periodontitis with Angular Bony Defects in Monkeys

• Published in: Nihon Shishubyo Gakkai Kaishi (Journal of the Japanese Society of Periodontology) Vol. 42; no. 4; pp. 282 - 297
• Main Authors: Yabuta, Hideshi, Sakagami, Ryuji, Kato, Hiroshi
• Format: Journal Article
• Language: Japanese
• Published: JAPANESE SOCIETY OF PERIODONTOLOGY 2000
• Subjects: angular bony defects; artificial periodontitis; gingival inflammation; occlusal trauma; root planing
• ISSN: 0385-0110; 1880-408X
• DOI: 10.2329/perio.42.282

The relationship between periodontitis progression andocclusal trauma is not clearly understood in detail. We studied the effects of periodontal marginal inflammation and occlusal trauma on the healing of angular bony defects treated by root planing. Subjects were 5 Japanese monkeys, initially, the first mandibular molars or second premolars were extracted. After healing, 3-wall bone defects were createdon adjacent teeth, notches were made at the bottom of defects, and plastic braids were inserted in defects. Braids were removed after 4 weeks and teeth root-planed. Experimental teeth were divided into 4 subgroups: in Group C, both inflammation and occlusal trauma were controlled; in Group I, inflammation persisted but occlusal trauma was controlled; in Group T, inflammation was controlled, but occlusal trauma was applied; and in Group IT, both inflammation and occlusal trauma were applied. Inflammation was evoked by suspended teeth cleaning, cotton ligature insertion around the neck of the tooth, and soft diets, controlled by teeth cleaning, root planing and hard diets. Occlusal trauma was induced by placing high onlays and applying orthodontic power chains. Sites were observed for 10 weeks clinically and radiographically with standardized radiography Pathological observations and histometrical analysis were also conducted. In Group C, angular bony defects, probing pocket depth (PD), and clinical attachment level (CAL) improved. In Group I, angular bony defects tended to decrease, but PD and CAL worsened. In Group T, PD and CAL improved but angular bony defects persisted. In Group IT, angular bony defects remained or worsened and PD and CAL worsened. This suggests that when angular bony defects were treated by root planing, postoperative controls of inflammation and occlusal trauma are important, i. e., postoperative control of inflammation influenced the improvement of CAL and the control of occlusal trauma influenced the improvement of angular bony defects. J. Jpn. Soc. Periodontol., 42: 282-297, 2000.