title: Effect of traumatic occlusion on periapical lesions in rats.
abstract: The effect of traumatic occlusion on periapical lesions in rats was investigated histologically and histometrically. Rats were divided equally into groups A to D. Rats in group A received no treatment; in group B, rats received pulpal exposure of the left mandibular first molar; in group C, a resin plate was cemented onto the occlusal surface of the corresponding maxillary molar; and in group D, the molar pulp was exposed and the resin plate was installed. At 1 and 2 wk, compression of the periodontal ligament and inflammation were less in group D than in group B. Lesions in the periapical periodontal ligament at 1, 2, and 4 wk in group D were significantly smaller than those in group B. This study suggests that traumatic occlusion delayed the enlargement of the periapical lesions in rats.
mesh_terms: D016301:Alveolar Bone Loss / Q000209:etiology / Q000473:pathology; D000818:Animals; D003769:Dental Occlusion, Traumatic / Q000150:complications*; D003782:Dental Pulp / Q000473:pathology; D008297:Male; D010482:Periapical Abscess / Q000209:etiology; D010483:Periapical Diseases / Q000209:etiology* / Q000473:pathology; D010486:Periapical Tissue / Q000473:pathology*; D010513:Periodontal Ligament / Q000473:pathology*; D011671:Pulpitis / Q000209:etiology; D051381:Rats; D017208:Rats, Wistar; D018709:Statistics, Nonparametric; D013997:Time Factors