Application of Le Fort Ⅰ combined with π osteotomy in the treatment of irregular arch of maxilla under 3D digital technology

Abstract:

Objective：To explore the clinical efficacy of Le Fort I and π osteotomy guided by 3D digital technology in the correction of severe dento-maxillofacial deformities（DENTO）. Methods：seven patients displayed developmental DENTO with irregular maxillary arch were selected. In this study，12 measurement indicators（SNA，SNB，ANB，A-CP，B-CP，PG-CP，OP-FH，MP-FH，N-ANS，ANS-ME，NA-PA，SNPg） were selected to perform 3D head model measurement analysis. The 3D head model measurement data was compared between preoperative 1-week（T0） and postop－erative 3months（T2）. In addition，Lateral cephalograms（T0 and T2） were taken with the patient oriented to the Frankfort Hori－zontal Plane for soft tissue measurements. All data were presented as mean ± SD. Paired t test was used to detect the differences between（T0） and （T2） by SPSS 21.0 software. Equivalence test was used in preoperative simulation（T1） and three months after operation（T2） by SPSS 21.0 software. Results：All patients in this group，T0 and T2 measurements showed that the difference in SNA angle，SNB angle and other major soft and hard tissues were statistically significant（P<0.01）. All measurements of T1 and T2 had no statistical significance. Because both sides of the 90% confidence interval are in the range of （-Δ，Δ）. indicating that under the guidance of 3D digital technology. The pre-surgically designed effects in facial appearance and oral function were obtained after the surgery. Conclusion：there is an effective treatment to correct complex deformities of the maxilla by using the Le Fort I osteotomy combined with π osteotomy under the guidance of 3D digital technology.