Taste disorders due to unilateral upper molar extraction in juvenile and adult albino rats

Abstract

Introduction

The sense of taste is fundamental to life; some studies have revealed a link between dental deafferentation (DD) by upper molar extraction and taste abnormalities in rats. However, no studies have been found that evaluate these variables using the Taste Reactivity Test (TRT).

Methods

Forty male Wistar rats (20 juveniles and 20 adults) were used and assigned to a control and experimental group. Both groups were fitted with cannulae for TRT, while rats in the experimental group also had their right upper molars extracted. Using an ingestive solution (1 M sucrose) and an aversive solution (3 mM denatonium benzoate [BD]), TRT was performed on days 1, 7, 14, and 21. Body and orofacial reactions were recorded and scored.

Results

DD influences ingestive responses in juvenile rats at days 7, 14, and 21; however, it only affects aversive responses at day 21. In adult rats, it influences ingestive responses at days 14 and 21, although it only affects aversive responses at day 14. When comparing ingestive and aversive responses between juvenile and adult rats in the experimental group, differences were identified in ingestive responses at days 7 and 14.

Conclusions

In juvenile and adult rats, upper molar extraction has a negative influence on ingestive and aversive responses. In addition, compared to adult rats, it has a negative effect on ingestive responses in juvenile rats.