Abstract
Statement of Problem: Traumatic occlusion can have an adverse effect on the temporomandibular joint tissue. Purpose: This study aims to determine the histological alteration in dog-s’ temporomandibular joints due to production of artificial traumatic occlusion. Materials and Methods: Twenty dogs were divided into a control group of four and two equal experimental groups. Unilateral occlusal interferences were created on the mandibular right first molars in the experimental groups. We established two experimental periods: one week and 45 days. After vital perfusion, the TMJs were separated for preparation, pigmentation, and examination by a pathologist. Descriptive statistics, Chi-square and Fisher's exact test were used to analyze the data. P.value less than 0.05 was considered as significant. Results: The findings showed no inflammatory changes in the TMJ. Increased fibrosis was found in 56.30% and vascularization in 28.12% of the disks. Fibrotic changes were detected in 46.87% and vascularization in 28.12% of the condyles. The glenoid fossas suffered from fibrosis in 15.62% of the cases. Conclusion: Traumatic occlusion leads to histopathological alterations including an increase in the fibrosis tissue and vascularization in the condyle and disk. KEY WORDS: Dental occlusion; Traumatic; Histology; Temporomandibular joint
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