Components of anterior crossbite in the primary dentition

The craniofacial and dental components of anterior crossbite children with a full primary dentition were investigated by means of a cephalometric and correlation study. A group of thirty-two Taiwanese children with anterior c rossbite was compared to a group of thirty-two normal occlusion subjects. T he facial profile polygon method was used for assessing morphological chara cteristics of craniofacial pattern. According to the results, early signs o f anterior crossbite are present in the primary dentition. A smaller anteri or cranial base, a retruded positioning of the maxilla and a smaller interi ncisal angle were found in the anterior crossbite children. A correlation a nalysis between all the cephalometric measurements was carried out, and the significance of the differences between correlation coefficients of the tw o groups was calculated. The normal occlusion group shows negative correlat ion between interincisal angle and FH-SGn angle. The anterior crossbite gro up shows positive correlation between FH-NPog angle and U1-FH angle.