Effect of palatoplasty timing on the dental arch relationships between upper and lower jaws / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the effect of different palatoplasty timing on the dental arch relationship between upper and lower jaws by a retrospective study.</p><p><b>METHODS</b>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 = 6.0-years-old and group C: > 6.0-years-old above. Maxilla and mandible plaster casts were taken for each patient. Goslon Yardstick system was used for assessing the dental arch relationships between upper and lower jaws.</p><p><b>RESULTS</b>Goslon Yardstick assessing results showed that there was no significant difference between group A and group B (P>0.05), there was significant difference between group C and group A (P<0.05), and C was no significant difference between group B and group C (P=0.095).</p><p><b>CONCLUSIONS</b>Six-years-old was a boundary line on considering the influence of cleft palate operation age on the maxillary development. The Yardstick mean value became smaller along with increase of operation age.</p>

Craniofacial morphology of patients with isolated cleft palate in the mixed dentition after palatoplasty / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To evaluate the craniofacial morphology of patients with isolated cleft palate in the mixed dentition after palatoplasty.</p><p><b>METHODS</b>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. Cephalometric analysis was carried out to evaluate craniofacial morphology.</p><p><b>RESULTS</b>The mean values of total cranial base length, maxillary depth, mandibular effective length in cleft patients were 86.48 mm, 44.79 mm and 65.45 mm, respectively. Those in control group were 91.27 mm, 48.84 mm and 70.49 mm, respectively (P < 0.001).</p><p><b>CONCLUSIONS</b>Underdeveloped maxilla and class III skeletal profile were presented in patients with isolated cleft palate.</p>

Clinical investigation of impacted maxillary canine / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the frequency, sex differences and location of impacted maxillary canine in orthodontic patients.</p><p><b>METHODS</b>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. CT scan images were evaluated. Chi-square test was used in the analysis.</p><p><b>RESULTS</b>The prevalence of maxillary canine impaction among Chinese orthodontic patients was 2.05%. The ratio between male and female was 1.8:1 and the ratio between buccal and palatal location was 2.1:1. Surgical exposure and orthodontic alignment had been predominant in such conditions. There was significant deference in the treatment between palatally impacted canine and buccally impacted one. More palatally impacted canines were extracted than buccally impacted ones.</p><p><b>CONCLUSIONS</b>There was significant difference in the treatment of maxillary canine impaction. More buccally impacted canines were found in Chinese patients, especially in female patients.</p>