The skeletal and dentoalveolar stability of the maxilla after LeFort I osteotomy for cant correction

Abstract

Objectives: The aim of this study was to assess the stability of the maxilla after LeFort I osteotomy for correction of maxillary canting caused by skeletal or dentoalveolar disorders.Methods: The patients underwent conventional LeFort I osteotomy for correction of maxillary canting. Frontal cephalograms were obtained before surgery (T1), immediately after surgery (T2) and more than 1 year after surgery (T3). The angles between the line connecting bilateral latero-orbitales (Lo-Lo′) and zygoma planes (ZPs) or occlusal planes (OPs) were measured, and the distances from the Lo-Lo′ or ZP to the left and right upper first molars were also measured to assess skeletal or dentoalveolar disorders at three time points (T1-T3).Results: In cases in which the Lo-ZP was more than 2° before surgery (T1), the Lo-ZP changed from 2.28° (T1) to 1.57° (T2) or 1.50° (T3). In cases in which the Lo-ZP changed less than two degrees and the Lo-OP changed more than 2°, the Lo-OP changed from 2.69° (T1) to 1.41° (T2) or 1.08° (T3), and these changes were significant. Lo-ZP was nearly stable across the time points. The distances from the Lo-Lo′ or ZP to left and right upper first molars were nearly stable from T2 to T3.Conclusion: Skeletal and dentoalveolar stabilities were obtained regardless of whether the canting was caused by skeletal or dentoalveolar disorder.