Document Type: Original Article


1 Dept. of Prosthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran

2 Dept. of Oral and Maxillofacial Pathology, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran

3 Dept. of Oral Medicine, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran

4 Public Health Department of Ghaem Hospital, Mashhad University of Medical Sciences


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