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SUMMARYObjective: To describe the maxillary asymmetryin patients with single cleft lip andpalate by using morphometrics geometricmethods.Materials and Methods: Applied morphometricsgeometric methods to analyzeimages captured from 3D reconstructionsof CT scans of 9 patients with unilateralcleft lip and palate, mean age of 13.7 yearswas used. Tps Dig2 software was used todigitalize 6 maxillary landmarks shapingboth the affected and the sides unaffected.TpsPower and TpsPLS to a small samplefor relative warps and consensus forsuperimposition. Thin plate function andasymmetry was used applying ASI-CLIC®package, and the principal componentanalysis was performed with the PASTsoftware version 2.17.0.Results: There is a statistically significantdifference (p<0.05) between the conformationof the maxilla on the affected sidecompared to unaffected. The study of asymmetryindicated different degrees anddifferences in the nature of the asymmetrythat characterizes different deformities ofunilateral cleft lip and palate. The principalcomponent analysis demonstrates bothinter-group variability and recognizes twoprincipal components, 39.4%, to the firstcomponent and 27.5% to the second component.There is a high correlation betweenthe formation of the unaffected side andaffected side conformation r= 0.93847.The thin plate deformation is uniform. Theallometry study indicated that there is noassociation between the shape and size.Conclusions: Morphometry Geometricmethod is a useful tool for assessingpreoperative maxillary conformations inpatients with unilateral cleft lip and palate.The side without the cleft is also affected,and is associated with the formation on theside of the cleft. The frontonasal suture isalso affected, in a greater proportion thanthe fronto zigomatic.Keywords: Morphometry geometric, cleftpalate, lip palate, computed tomographycone beam.

Description of facial symmetry in patients with unilateral cleft lip and palate using geometric morphometry and computerized tomography