Prevalence of sleep bruxism and associated factors in preschool children.
OBJECTIVE
The purpose of this study was to evaluate the prevalence of sleep bruxism and associated factors in three- to five-year-olds.


METHODS
A representative cross-sectional study was conducted with a sample of 749 preschool children during immunization campaigns. Data acquisition involved an oral clinical exam, anthropometric measures, and a questionnaire administered in interview form. All data were analyzed using the chi-square test and Poisson regression with robust variance with the aid of SPSS software.


RESULTS
The prevalence of sleep bruxism among preschool children was approximately 14 percent. Statistically significant associations were found: between sleep bruxism and lower dental crowding (prevalence ratio=3.38; 95% confidence interval=1.9-5.7); for the habit of biting on objects (PR=2.49; 95% CI=1.4-4.4); for duration of breast-feeding for a period longer than 12 months (PR=1.98; 95% CI=1.2-3.2); and for bottle-feeding for more than 24 months (PR=1.93; 95% CI=1.2-3.1).


CONCLUSIONS
Lower arch crowding, the habit of biting on objects, and prolonged breast-feeding and bottle-feeding were associated with sleep bruxism in the preschool children analyzed in the present study.
Doctoral student, Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
Raquel G
RG
Vieira-Andrade
Master student, the Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Vales do Jequitinhonha e Mucuri, Diamantina, Minas Gerais, Brazil.
Clarissa L
CL
Drumond
Doctoral student, Department of Morphology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
Paulo A
PA
Martins-Júnior
Doctoral student, Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
Patrícia
P
Corrêa-Faria
Postdoctoral student, the Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Vales do Jequitinhonha e Mucuri, Diamantina, Minas Gerais, Brazil.
Geruza C
GC
Gonzaga
PhDs and associate professor, the Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Vales do Jequitinhonha e Mucuri, Diamantina, Minas Gerais, Brazil.
Leandro S
LS
Marques
PhDs and associate professor, the Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Vales do Jequitinhonha e Mucuri, Diamantina, Minas Gerais, Brazil. mlramosjorge@gmail.com.
Maria L
ML
Ramos-Jorge
D001827:Body Height; D001835:Body Weight; D001903:Bottle Feeding / Q000706:statistics & numerical data; D001938:Brazil / Q000453:epidemiology; D001942:Breast Feeding / Q000706:statistics & numerical data; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D003769:Dental Occlusion, Traumatic / Q000453:epidemiology; D004522:Educational Status; D005145:Face; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000453:epidemiology; D017533:Marital Status; D024343:Open Bite / Q000453:epidemiology; D010290:Parents / Q000193:education; D015995:Prevalence; D012307:Risk Factors; D020186:Sleep Bruxism / Q000453:epidemiology*; D013391:Sucking Behavior