Cephalometric changes during self-correction of primary anterior crossbite.
Longitudinal growth changes were investigated cephalometrically for sixty-one Japanese girls who had anterior crossbite at the initial visit (ages 3 years and 11 months on an average). Cephalograms were taken annually from the initial visit to the end of the observation period (ages 7 years 6 months on an average). Eleven of them (Group N1) showed self-correction of anterior crossbite during the primary dentition; ten (Group N2) showed self-correction when the permanent incisors erupted and forty (Group R) did not show self-correction. There was no statistical skeletal difference between Groups N1 and N2 during the observation period. Groups N1 and N2 were larger, however, than Group R in A'-Ptm'/Pog'-Go (p < 0.05) and Group N1 was smaller than Group R in Pog'-Go/N-S (p < 0.01) at the end of the observation period. In summary, favorable growth of the maxilla relative to the mandible leads to self-correction of primary crossbite and when mandible size relative to the cranial base is large, primary crossbite does not show self-correction.
Nakamura
S
S
School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
Miyajima
K
K
Nagahara
K
K
Killiany
D M
DM
Tsuchiya
T
T
D000704:Analysis of Variance; D002508:Cephalometry; D002648:Child; D002675:Child, Preschool; D019140:Dental Care for Children; D006801:Humans; D008310:Malocclusion / Q000175:diagnosis / Q000503:physiopathology*; D008445:Maxillofacial Development; D018709:Statistics, Nonparametric; D014094:Tooth, Deciduous