IADR Abstract Archives

Salivary pH Recovery After Acidic Tea Infusions Consumption

Objectives: Acidic tea infusions might play a role in increasing the risk of erosive tooth wear (ETW), potentially related to their chemical properties. This study aims to assess, in vivo, the time needed for the salivary pH to return to baseline after exposure to acidic tea, compared to orange juice, the gold standard to study ETW.
Methods: Fifteen volunteers with normal salivary flow participated in this in vivo, crossing-over study. Initial pH and titratable acidity of each treatment (tea infusions prepared from commercial teas [black (pH=2.88±0.01); green (pH=2.85±0.01); herbal tea (pH=2.60±0.01)] and two control solutions [orange juice (positive-control) and 20% sucrose (negative-control)] were determined. Volunteers were asked to retain 15 mL of each beverage in the mouth for 10 s, to expectorate it (time zero), and their saliva was collected after 15, 30, 45, 60, 90, 120 and 180 s in microtubes. Salivary pH was determined using a previously calibrated mini pH electrode. Area under the curve (AUC) was calculated. Data were compared by repeated measures ANOVA/Tukey (pH overtime) and ANOVA/Tukey (AUC).
Results: There was a significant effect of each treatment (p<0.05). Black and green tea recovered their basal pH after 30 s; herbal tea after 45 s, same as orange juice. AUC showed that all treatments were different to the negative control (p<0.05), but tea infusions did not differ from the positive control. Among the infusions, herbal tea presented highest titratable acidity and also the highest AUC, similar to orange juice (p>0.05).
Conclusions: Titratable acidity of the infusions explains the differences observed among tea infusions to recover the salivary pH. Furthermore, the lack of difference of tea with orange juice suggests that the frequent consumption of acidic tea might increase the risk of ETW.

2020 Chilean Division Meeting (Virtual)

2020

Cariology Research-Erosion
  • Bustamante, Claudia  ( Universidad de Talca , Talca , Chile )
  • Bravo, Valentina  ( Universidad de Talca , Talca , Chile )
  • García, Natalia  ( Universidad de Talca , Talca , Chile )
  • Giacaman, Rodrigo  ( Universidad de Talca , Talca , Chile )
  • Fernández, Constanza  ( Universidad de Talca , Talca , Chile )
  • NONE
    Oral Session
    Oral Session 2