A novel rat model of denture stomatitis and the role of antibiotics in the development of the disease

Author(s):Show less -

Moraes, Gustavo Simao ; Albach, Thais ; Sugio, Carolina Yoshi Campos ; Cachoeira, Victoria Schlumberger ; Kiratcz, Falyne ; Claudino, Marcela ; Campagnoli, Eduardo Bauml ; Pochapski, Marcia Thais ; dos Santos, Fabio Andre ; Neppelenbroek, Karin Hermana ; Urban, Vanessa Migliorini

• Document type: Journal article
• Source: Medical Mycology; v. 60, n. 12, p. 11-pg., 2022-11-06.

Abstract

Lay Summary Denture stomatitis is an oral inflammatory disease with high recurrence rates. Different animal models have been reported in the literature, but some gaps still need to be addressed. A reproducible in vivo model should be established to test new treatment approaches. This study compared different conditions to establish a rat model of denture stomatitis. Immunocompetent Wistar rats were divided into two groups (n = 35): Tetracycline = administration of 0.83 mg/ml of tetracycline hydrochloride 7 days before induction of denture stomatitis and amoxicillin = administration of 0.156 mg/ml of amoxicillin with clavulanic acid 4 days before induction of denture stomatitis. A suspension of Candida albicans was inoculated on the palate followed by the use of a palatal device contaminated with C. albicans inoculum for 4 days to induce denture stomatitis. As controls, some rats were not submitted to any procedure or used a sterile palatal device for 4 days. The development of denture stomatitis was confirmed by visual analysis, colony-forming units per milliliter (CFU/ml) count, histopathological and immunohistochemical analyses, and through myeloperoxidase (MPO) and N-acetylglucosaminidase (NAG) assays. Rats were euthanized right after device removal (T0), 4 (T4), or 6 (T6) days after device removal. Tetracycline improved the development of the disease, with more severe clinical signs at T0. Similar results were observed in the CFU/ml count and in the histometric and immunohistochemical analyses. Higher MPO expression was detected in the palates of the tetracycline group (P = .006). Despite the subtle differences between antibiotics, tetracycline showed better results in inducing and maintaining denture stomatitis for at least 4 days after device removal. (AU)

• FAPESP's process: 17/07314-1 - Clinical evaluation of antifungal addition to temporary soft liner in the treatment of denture stomatitis
• Grantee: Karin Hermana Neppelenbroek
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/22996-1 - Tissue response in animal model of tissue conditioner containing inclusion complex antifungal:²-cyclodextrin for denture stomatitis treatment
• Grantee: Carolina Yoshi Campos Sugio
• Support Opportunities: Scholarships in Brazil - Master