The aim was to investigate the salivary amino acid profile in children with protein-energy undernutrition (PEU) and its association with caries experience in the presence of other risk factors. The study had a cross-sectional design and was carried out with 122 children (12-71months old), classified according to their level ofundernutrition (mild-GI, n = 22; moderate-GII, n = 53) or healthy controls (GC, n = 47). The children were categorized based on the presence of caries into caries-experienced groups (ceos > 0, 22 CG, 12 GI and 18 GII) and caries-free groups (ceos = 0, 25 CG, 10 GI and 36 GII). Total unstimulated and stimulated saliva were collected to determine amino acids and Streptococcus mutans, respectively. Eighteen amino acids were associated with PEU. Undernutrition and caries experience influenced the presence of thefollowing amino acids: L-anserine, asparagine, ethanolamine, gamma-aminobutyric acid,and norleucine. Asparagine was a significant predictor of a lower probability of caries experience in a logistic regression model. Salivary amino acids are associated with undernutrition in children, and the presence of asparagine in saliva relates to a lower caries risk.
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