The Evaluation Of Surgically Assisted Rapid Palatal Expansion On Cleft Lip And Palate Patients By CBCT

Subeject : To evaluate the clinical effects of surgically assisted rapid palatal expansion by CBCT in growing cleft patients,so as to provide reference for clinical diagnosis and treatment.Methods: The sample consisted of 11 individuals with unilateral complete cleft lip and palate who had a constricted maxilla.They all underwent repaired cleft lip and palate previously.(Eleven cases with unilateral complete cleft palate and severe constricted maxilla were selected,who have been repaired cleft lip and palate previously.)Bilateral buccal alveolar corticotomy was adopted for surgically assisted rapid palatal expansion. Expansion results were evaluated by EZ3D2009 software through CBCT images which were taken before and after expansion.Paired t-test or Wilcoxon test was performed for statistical analysis.(SPSS 19.0 software was applied to the measurement results after treatment for paired t-test or Wilcoxon test.)Results:1. After the expansion, alveolar crest level of anchorage teeth has no statistically significancal change. 2. To the first premolar of cleft side and noncleft side,the thickness of buccal alveolar bone significancally decreases, the opposite result was found in palatal alveolar. 3. For the first premolar and the first molar teeth, alveolar bone width were significantly increased, the difference was statistically significant.The front of alveolar bone expansion bow quantity is greater than the back. 4. Significant inclination was oberserved in anchorage teeth of both side. The anchorage of teeth both in cleft side and non-cleft side had significantly buccally displacement. 5. The UI-NS angle dereased,which means upper central incsiors lingual displace. 6.No significant advances of the A-Point and ANS-Point in saggital dimension, which means the maxillary had no forward displacement. 7. The Go Gn-SN angle had no significant changes in vetical dimension,which meansthe mandible had no rotation.Conclusion:Surgically assisted rapid palatal expansion in and prepubertal patients with cleft lip and palate can produce satisfactory clinical effect. The greatest changes were seen in the transverse dimension; changes in the vertical and anteroposterior dimensions were negligible. The cleft and noncleft sides were symmetrically expanded.