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The growing consumption of soft drinks and fruit juices and its possible harmful effect on dental structures has aroused great interest in dentistry nowadays. Among the main effects often caused by the action of these carbonated drinks on dental enamel, erosions can be cited. The purpose of this study was to verify the erosive potential of energy drinks sold on the domestic market on its pH and buffer capacity and quantitatively analyze the changes promoted on enamel surface of permanent teeth. For pH and buffer capacity evaluation 10 trademarks were selected. Two 30 mL samples were tested from each energy drink and the readings were made in duplicate using a pHmeter in order to obtain an average. In assessing the buffer capacity 50μL NaOH aliquots were added to the 30 mL solution until the pH reached 7. For enamel surface, 40 upper pre-molars were used. Three experimental groups (control, Red Bull® and Red Bull Light®) with 6 specimens each were designed. Each experimental group was submitted to 2 daily challenges by immersion for 5 minutes on the energy drink, with an interval period of 12 hours. During the intervals teeth remained in artificial saliva. The experiment was carried out for 3 days, totaling 30 minutes of exposure to the solution. The evaluation was performed by means of initial and final readings on the microhardness device (Knoop Hardness). It was found that all the energy drinks studied showed a low pH, with values ranging from 2.1 to 3.2. Regarding buffer capacity, it was found that the amount of base required promoting the neutralization of the solutions ranged from 1200μL to 3750μL. It may be concluded that all solutions examined have the potential to promote mineral loss and consequently dental erosion, due to the low pH and high buffer capacity of tested energy drinks. The energy drinks analyzed promoted significant mineral losses on the dental enamel surface. The possible deleterious action of these drinks to dental surfaces requires that the dentist act preventively, alerting their patients about the adverse effects that may be caused by its frequent ingestion.

Avaliação in vitro das alterações superficiais do esmalte dentário de dentes permanentes submetidos à ação de bebidas energéticas