In subjects in whom the central permanent incisors and first molars were present, the following orthodontic characteristics were assessed: the different sagittal molar relationship, the presence of anterior and/or lateral open bite, the presence of lateral crossbite (unilateral or bilateral), and the presence of scissor bite (unilateral or bilateral).
First of all, the sagittal relationship of the first permanent molars, as described by the angle classification, was registered [17 ]. It was not recorded if the first permanent molars were missing. Second of all, the presence of anterior open bite was recorded if there was no vertical overlap of the incisors. A visible space between fully erupted canines, premolars, or molars with antagonists was registered as lateral open bite. Third of all, lateral crossbite was recorded if one or more buccal cusps of the mandibular canines, premolars, and/or molars occluded buccally to the buccal cusps of the maxillary antagonists in habitual occlusion. Finally, scissor bite was assessed if a total maxillary buccal (or mandibular lingual) crossbite was observed, with the mandibular dentition completely contained within the maxillary dentition in habitual occlusion [17 ].
First of all, the sagittal relationship of the first permanent molars, as described by the angle classification, was registered [17 ]. It was not recorded if the first permanent molars were missing. Second of all, the presence of anterior open bite was recorded if there was no vertical overlap of the incisors. A visible space between fully erupted canines, premolars, or molars with antagonists was registered as lateral open bite. Third of all, lateral crossbite was recorded if one or more buccal cusps of the mandibular canines, premolars, and/or molars occluded buccally to the buccal cusps of the maxillary antagonists in habitual occlusion. Finally, scissor bite was assessed if a total maxillary buccal (or mandibular lingual) crossbite was observed, with the mandibular dentition completely contained within the maxillary dentition in habitual occlusion [17 ].
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