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Histopathological Changes in Dental Pulp of Rats Following Radiotherapy Publisher



Madani ZS1 ; Azarakhsh S2 ; Shakib PA3 ; Karimi M4
Authors
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Authors Affiliations
  1. 1. Department of Endodontics, Dental Faculty, Babol University of Medical Sciences, Iran
  2. 2. Department of Endodontics, Dental Faculty, Arak University of Medical Sciences, Arak, Iran
  3. 3. Department of Oral Maxillofacial Pathology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Department of Radiology and Radiotherapy, Faculty of Medicine, Babol University of Medical Sciences, Babol, Iran

Source: Dental Research Journal Published:2017


Abstract

Background: Radiotherapy is one of the oral and pharyngeal cancer treatment methods that can cause damage to the tissues in the radiation area; the purpose of this study is to evaluate the effects of radiotherapy on dental pulp tissue in rats. Materials and Methods: In this interventional, experimental double-blind study, 30 rats were studied in three groups (n = 10 each). The first group received 12 gray (Gy), the second group received 18 Gy in one session, and the third group was not exposed to radiation (control group). The 5 μm sections of mandibular molar tooth were prepared and stained with hematoxylin and eosin. Samples were studied under optical microscope to evaluate and score inflammation, necrosis, hyalinization, and vascular congestion. The data were coded and analyzed by statistical tests of χ2 and Fisher's exact tests. The significant level of P = 0.05. Results: In Group 1, necrosis in two cases, inflammation in one case, hyalinization in one case, and vascular congestion in four cases were observed. In Group 2, inflammation in four cases, hyalinization in two cases, and vascular congestion in five cases were observed. In Group 3, inflammation was observed only in one case. In comparison between the groups, no significant differences were observed in inflammation (P > 0.05), necrosis (P > 0.05), and hyalinization (P > 0.05). However, the difference was significant for vascular congestion (P < 0.05). Conclusion: Radiotherapy with doses of 12 and 18 Gy had no significant effect on inflammation, necrosis, and hyalinization in all groups; however, the difference was significant for vascular congestion.