A Study of Maxillarly Segment Collapse in Children with Unilateral Cleft Lip and Palate -Arch Form and Occlusal Aberration-

1)牙槽弓分为8种形态，包括4种复合形态；2)前塌组牙弓长度较短，宽长比较大；3)尖牙节段牙槽区垂直生长，外侧塌陷组牙槽突区向上移位。然而，前牙塌陷组的这种移位很小。4)反牙合的发生率很高，特别是在小牙段和尖牙区，以及与小牙段相关的咬合。5)这些结果表明，UCLP患者有必要重新考虑手术方式，以克服显著的牙弓塌陷和畸形。

The material of this study was included 117 dental casts taken from children with UCLP, 66 males and 51 females.1)Dentoalveolar arch was categorized in 8 forms including 4 compound forms.2)The anterior collapsed group showed a short dental arch length and large width / length ratio.3)The vertical growth of the alveolar region at the canine segment, showed an upward displacement in the lateral collapsed group. However, this displacement was little in the anterior collapsed group.4)A high incidence of crossbite, especially in the minor segment and canine regions was detected as well as an penbite related to the minor segment.5)These results suggested that reconsideration of the surgical procedures of the UCLP patient is necessary to overcome the remarkable dental arch collapse and deformity.