Dentoskeletal morphology in children with Deckbiss.

A comparison of dentoskeletal morphology in 176 Deckbiss malocclusions with Class I molar relationship (Class I/2) and 156 Deckbiss malocclusions with Class II molar relationship (Class II/2) was performed using lateral cephalometric radiographs. Children at the ages of 8 to 10 years and 11 to 13 years were evaluated. The results of the study revealed broad variations in the variables analysed. A relatively short lower face and an obtuse interincisal angle were the only consistent features of the Deckbiss (Class I/2 and Class II/2). Otherwise the dentoskeletal morphology of the Deckbiss was untypical. When comparing the Class I/2 and Class II/2 samples the following morphological traits were more pronounced and/or more frequent in the Class II/2 sample: 1. mandibular retrusion, 2. skeletal Class II jaw base relationship, 3. mandibular plane angle reduction, 4. jaw base hypodivergency, and 5. upper incisor retroclination. Lower incisor retroclination, on the other hand, was more pronounced and more frequent in the Class I/2 sample. Age affected exclusively the Class I/2 sample: maxillary and mandibular retrusion were seen more frequently in the younger than in the older subjects.