Bite force of children with repaired unilateral and bilateral cleft lip and palate.
OBJECTIVE
To assess the bite force (BF) of children with repaired cleft lip and palate (CLP).


METHODS
Children aged 6-12 years, with and without CLP, were divided into the following 5 groups: (1) control group (CON): 34 children without CLP (17 female, 17 male, mean age 8.2±1.4); (2) cleft lip group (CL): 31 children with cleft lip involving the pre-maxilla (15 female, 16 male, mean age 9.7±1.3); (3) unilateral CLP group (UCLP): 36 children with complete unilateral CLP (11 female, 25 male, mean age 9.4±1.6); (4) bilateral CLP group (BCLP): 32 children with complete bilateral CLP (11 female, 21 male, mean age 9.5±1.7); and 5) cleft palate group (CP): 17 children with complete cleft palate (9 female, 8 male, mean age 9.4±1.6). Briefly, in this clinical trial, BF was assessed before alveolar bone grafting with a gnathodynamometer (IDDK, Kratos, Cotia, SP, Brazil). For CON, BCLP, CL and CP groups, BF was obtained in the anterior and posterior region of the maxilla. For the UCLP group, BF was assessed in the anterior and posterior regions of both segments. Differences among groups were evaluated by ANOVA test, and Tukey's test was used to assess any correlations among variables (P<0.05).


RESULTS
Unexpectedly, no differences of BF were observed among CON and any of the cleft groups. However, a stronger BF was observed in the CL group when compared to the UCLP and BCLP groups. Next, no differences were observed between the cleft side and the noncleft side in the UCLP group. Lastly, in all groups, BFs from the anterior region of the maxilla were less when compared to the posterior regions.


CONCLUSIONS
The BF of children with CLP is no different from children without CLP.
Department of Biological Sciences, Discipline of Physiology, Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru, SP, Brazil.
Michele Alves
MA
Garcia
Department of Pediatric Dentistry, Orthodontics and Community Health, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
Daniela
D
Rios
Department of Pediatric Dentistry, Orthodontics and Community Health, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
Heitor Marques
HM
Honório
Department of Biological Sciences, Bauru School of Dentistry and Laboratory of Physiology, Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru, SP, Brazil. Electronic address: ivysuedam@fob.usp.br.
Ivy Kiemle
IK
Trindade-Suedam
D064728:Alveolar Bone Grafting; D001732:Bite Force; D016022:Case-Control Studies; D002648:Child; D002971:Cleft Lip / Q000503:physiopathology* / Q000601:surgery*; D002972:Cleft Palate / Q000503:physiopathology* / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla / Q000503:physiopathology / Q000601:surgery
Bite force; Child; Cleft lip; Cleft palate