The effect of diet on palatal prosthetic coverage in rats

Previous studies have used a rat model for examination of the histopathology of oral candidiasis or mucosal coverage with dental prostheses. These studies have been complicated by the presence of accumulated debris between mucosa and prostheses. Objectives: The present study was undertaken to develop further the Wistar rat as a suitable animal model on which to study the effects of dental prostheses on oral mucosa. Methods: The effects of three dietary regimes, used for 7 and 14 days, upon debris accumulation under denture-like appliances and measurable epithelial parameters were analysed by computerised planimetry. Results: Individual variation in animal weights during the study was noted, with some appliance-wearing animals exhibiting a weight gain while others lost weight. A powdered diet used in a paste form gave the least accumulation of debris under appliances and the least differences between appliance wearers and controls. Conclusion: The use of the Wistar rat model utilising the past diet described is indicated for future investigation of the effect of prostheses on oral mucosa.