Obesity and dental caries in paediatric patients. A cross-sectional study

Authors:

ABSTRACT

Aim

The aim of the present cross-sectional study was to evaluate the relationship between childhood obesity and
dental caries, in paediatric subjects, through the use of two methods of diagnosis of overweight-obesity: Body Mass Index
(BMI), and Dual energy X-ray Absorptiometry (DXA).

Methods

A total of 107 healthy patients, aged between 6 and 12 years
(53.3 females, 46.7 males) were included in the study. Each patient underwent a nutritional examination and
dental check-up. The nutritional examination was performed at the Department of Neuroscience, Human Nutrition Unit,
University of Rome Tor Vergata and consisted of anthropometric measurements, BMI calculation, DXA exam, body fat mass
(FM) assessment. Dental examinations were performed by a trained dentist of the Paediatric Dentistry Unit of PTV Hospital,
University of Rome Tor Vergata. Dental caries was assessed using visual-tactile method and X-rays (bite-wing and
panoramic radiography); the dmft/DMFT index was calculated. The subjects were classified as underweight, normal weight,
pre-obese, obese, according to different criteria: a) age- and sex-specific BMI according to the Cacciari growth charts and
cut-offs, b) body fat mass percentage (FM) according to the WHO cut-offs, c) body fat mass percentage (FM)
according to the McCarthy growth charts and cut-offs. Statistics: The statistical analysis was performed with the SPSS
software (version 11.01; SPSS Inc., Chicago, IL, USA). The dmft/DMFT index was checked for normality using the
Kolmogorov-Smirnov test. Independence of the dmft/DMFT distribution from sex and age was checked by using the Mann
Whitney and Kruskal Wallis tests. Differences in the dmft/DMFT values between groups, according to BMI and FM
classifications, were tested using the Mann Whitney test. The minimal level of significance of the differences was fixed at p-
value 0.05 for all procedures.

Results

The comparison between BMI and DXA data shows statistically significant
differences between BMI-FM (WHO cut-offs) classifications (p0.001) and BMI-FM (McCarthy cut-offs)
classifications (p 0.001). According to the BMI classification, there was no significant association between increase of
dmft-DMFT and pre-obesity/obesity, but according to the FM (WHO cut-offs) classification, the pre-obese/obese
children had higher caries indexes than normal weight subjects, both in deciduous teeth (p=0.003) and permanent teeth
(p=0.000). Furthermore, according to the FM (McCarthy cut-offs) classification, obese children had higher caries
indexes than normal weight and pre-obese subjects, both in deciduous teeth (p=0.030, p=0.02) and permanent teeth (p=0.019,
p=0.011), respectively, but they had a dmft-DMFT value comparable with underweight children.

Conclusion

The BMI
misclassified adiposity status of the paediatric population compared to DXA, which provides a reliable screening and a more
specific assessment of body composition. The misclassification of childhood obesity, determined by the BMI, could be used
to explain the conflicting data in the literature on the association between obesity and dental caries. Our results highlighted
for the first time the relationship between dental caries prevalence and body fat percentage measured by DXA.

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