RESUMO
Background: Le Fort I osteotomy is one of the most commonly performed procedure, either alone or in conjunction with other orthognathic procedures for maxillary deformities. Objective: The present prospective study pertains to definite diagnosis, orthosurgical planning with cephalometric predictions of dento-osseus deformities of maxilla and their correction by LeFort I osteotomy . Material and Methods: Fourteen patients with skeletal deformity along with malocclusion which was too severe to be corrected orthodontically alone were selected. Parameters were selected on the basis of clinical findings, cephalometrically hard and soft tissue landmarks [COGS (Burstone and Legan) and Steiners analysis]. Parameters were observed and compared preoperatively prediction values, postoperatively and on follow-up. Results: There were obvious improvement in various linear and angular readings of hard and soft tissues.In linear measurements,NANS HP decreased from 57.62 ± 3.3 to 52.4 ± 2.9; ANS-Gn HP decreased from 75.8 ± 8.1 to 69.3 ± 6.1; NA || HP reduced by approximately 5mm; N-Pg || HP decreased from -12.07 ± 9.6 to -3.78 ± 8.8 and PNS-N HP decreased from 55.28 ± 5.08 to 58.07 ± 4.4. On analysis of angular hard tissue measurements, N-A-Pg angle decreased from 5.14 ± 5.75 to 4.17 ± 2.73 (superior repositioning of maxilla) and increased from 3.0 ± 1.4 to 4.5 ± 0.7 (inferior repositioning of maxilla);MP-HP angle, Ar-Go-Gn angle decreased following superior repositioning and increased following inferior repositioning of maxilla and SNA angle decreased from mean 80.8 to 79.5. Conclusion: LeFort I osteotomy is really a workhouse of orthognathic surgery in which maxilla can be mobilized in vertical and saggital planes to correct various dento-osseous deformities.