Dental caries and caries-associated mechanisms found in the saliva of fi rst year students at the School of Dentistry, UNAM (National Autonomous University of Mexico)

Juan Antonio Arreguín Cano, Cecilio Ríos Gerónimo, Cristina Hernández Bermúdez, María Fernanda Ostia Pérez, Jairo Agustín Ventura Arroyo, Carlos Álvarez Valadez, Zeltzin González Rosas, Gloria Gutiérrez Venegas


Three hundred and eighty first year students of the National School of Dentistry (UNAM) (n = 380) (academic year 2012-2013), were assessed targeting determination of DMFT (decayed, missing, lost teeth) index as well as to establish a relationship of whether caries is associated to Lactobacillus and Streptococcus microorganisms. DMFT index was recorded using World Health Organization (WHO) parameters. Samples of all students were taken and colony-forming units of Streptococcus and Lactobacillus were determined. DMFT
indexes mean was established at 7.25 ± 4.59. Females (n = 278) and males (n = 102) exhibited mean DMFT indexes of 7.11 ± 4.66 and 7.29 ± 4.57 respectively. Results revealed that 19 year old students exhibited lesser amounts of caries than students of other ages. Both Streptococcus and Lactobacillus were significantly correlated to each other as well as to caries incidence. Increase in the number of the aforementioned micro-organisms, especially
Streptococcus mutans, were associated to DMFT increase.

Palabras clave

DMFT index, colony forming units, Streptococcus, Lactobacillus.

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