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

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... thodontically 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,N-ANS  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 . 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.