Evaluation Of Dental Abnormalities And The Dental Arch Relationships Between Upper And Lower Jaws With Cleft Lip And Palate Patients

Objective: To analyze dental abnormalities of mixed dentition and permanent dentition children who lived in Xinjiang with nonsyndromic cleft lip and/or palate (NSCLP) by their panoramic radiographs and dental casts, and to know the dental abnormalities of number, forma and eruption. Then select patients of unilateral complete cleft lip and palate (UCCLP) from these samples, evaluate their dental casts by the Goslon Yardstick system to get the dental arch relationships of mixed dentition and permanent dentition of patients, as well as furnish evidence for diagnosis and treatment design to Xinjiang children with cleft lip and palate. Methods: Experiment 1:Select 80 children who lived in Xinjiang with cleft lip and palate and analyze heir panoramic radiographs and dental casts. Analyze the occurrences of the maxillary lateral incisor, the second premolar, supernumerary teeth, and the abnormal maxillary lateral incisor. Experiment 2: Select 40 patients of unilateral complete cleft lip and palate (UCCLP) from the samples of Part 1 and divide into 2 groups- mixed dentition and permanent dentition. Evaluate their arch relationships between upper and lower jaws by Goslon Yardstick systems, and compare the results of different groups. Results: A total of 57.8% of the unilateral cleft lip and palate (UCLP) patients presented with missing permanent lateral incisors in the cleft area and 17.8% contralaterally. A total of 75.6% of the UCLP patients central incisor rotations in the cleft area and 8.9% contra laterally, and results have statistical differences between cleft side and noncleft side with UCLP patients (P<0.05).There was no statistical differences of occurrences among the maxillary lateral incisor, the second premolar, supernumerary teeth, and the abnormal maxillary lateral incisor between abnormal and normal patients (P>0.05). The possibility of missing permanent lateral incisors of the bilateral cleft lip and palate (BCLP) was present in 60.0%, and that patients with cleft palate only (CPO) was 15.0%. Supernumerary teeth presented in the patients with BCLP and CPO were 26.7% and 5.0%; Rotation central incisor in the BCLP and CPO patients were 73.3% and 20.0%. In mixed dentition, 22.2% patients'dental arch relationships were not very coordinate, which belonged to grade 4 and grade 5 in Goslon Yardstick system, and the mean Goslon score was 2.72. In permanent dentition, 40.9% patients'dental arch relationships were not very coordinate, which belonged to grade 4 and grade 5 in Goslon Yardstick system, and the mean Goslon score was 3.46. Conclusions: The dental abnormalities of number, forma and eruption are very serious in Xinjiang uygur autonomous region. Dental arch relationships and treatment in the permanent dentition of UCCLP patients were more complicated than mixed dentition.