Prevalência de má oclusão em pré-escolares de Piracicaba – SP

The aim of this study was to evaluate the morphological occlusion relationships of the children aged 3 to 6 years, who attend the county daycares from Piracicaba-SP. It was evaluated the anterior-posterior and transversal relationship between the dental arches in deciduous dentition and they were classified according to the morphology: Incisor Relationship – Vertical Plane: (anterior open bite, Overbite, Normal – upper incisor covering athird of the lower incisor); Incisor Relationship – horizontal plane: (Crossbite, Overjet, Normal – upper incisor covering athird of the lower incisor buccally); Anterior-posterior primary cusps relationship: (Class I – upper cusp occlusion in the space between cusp and primary first molar; Class II – anterior cusp occlusion in the space between cusp and primary first molar; Class III – posterior cusp occlusion in the space between cusp and primary first molar); Terminal relationship of the primary second molars: Mesial Step, Distal Step, Vertical Plane. A Dentist and a Speech Language Therapist under natural light in the daycares examined all the children. It was concluded that there was a high prevalence of malocclusion (71.6%) in the sample studied. The higher percentage was found to anterior open bite associated to the lateral-posterior crossbite.