[Effect of palatoplasty timing on the dental arch relationships between upper and lower jaws].

Objective: To investigate the effect of different palatoplasty timing on the dental arch relationship between upper and lower jaws by a retrospective study.

Methods: A total of 103 UCLP consecutive cases over 10 years of age were followed up after operation, which were divided into three groups according to the age of operation, group A: < or = 3.0-years-old, group B: < or = 6.

[Craniofacial morphology of patients with isolated cleft palate in the mixed dentition after palatoplasty].

Objective: To evaluate the craniofacial morphology of patients with isolated cleft palate in the mixed dentition after palatoplasty.

Methods: Twenty patients (7 to 11 years old) with isolated cleft palate in the mixed dentition were selected. The control group comprised 35 age-matched non-cleft children without orthodontic treatment.

[Clinical investigation of impacted maxillary canine].

Objective: To investigate the frequency, sex differences and location of impacted maxillary canine in orthodontic patients.

Methods: Two hundred and fifteen patients (77 males and 138 females) with maxillary canine impaction were included in the study. The experimental group was gathered from the Department of Orthodontics, Peking University School and Hospital of Stomatology.