The UnderSpinal Osteotomy: A modified low Lefort I osteotomy to correct maxillary dentoalveolar protrusion

Abstract Maxillary dentoalveolar protrusion is a common dentofacial deformity in some communities. The gold standard movement to treat this deformity is maxillary setback although it is normally not the first choice due to surgical difficulty. The aim of this study was to present The UnderSpinal Osteotomy a Low Lefort I Osteotomy modified for maxillary setback for correcting dentoalveolar protrusion. This osteotomy design prevents the loss of nasal bone support and preserves the nasal chamber volume in cases of maxillary protusion.