3125 Transversal Dimensions of the Dental Arches and Malocclusions in the Early Mixed Dentition
J. VARRELA, University of Turku, Finland, K. KESKI-NISULA, Vaasa Central Hospital, Finland, L. KESKI-NISULA, Tampere University Hospital, Finland, R. LEHTO, Jalasjärvi Health Center, Finland, and P. LUSA, Kurikka Health Center, Finland

Objectives: It has been suggested that deficient transversal growth of the maxilla is an important factor in the development of many common malocclusions. The aim of this study was to analyse the width of the dental arches in the early mixed dentition and to compare children with normal occlusal development (N=34) to those with posterior crossbite (N=31), distal step (£ 1 mm; N=103), excess overjet (£ 4 mm; N=131), or deep bite (£ 4 mm; N=172).

Methods: The mean age of the children, examined at the onset of the mixed dentition period, was 5.1 years (range 4.0 - 7.8 years). Intercanine and intermolar distances of the deciduous dental arches were measured from dental casts. The t-test was used in the statistical analysis.

Results: Children with posterior crossbite, distal bite, excess overjet or deep bite showed significantly narrower maxillary intermolar width (p<0.01) than those with normal occlusal development. The maxillary intercanine width was found to be narrow in children with posterior crossbite, distal bite or deep bite (p<0.05) but normal in those with excess overjet. Transversal dimensions of the mandibular dental arch were normal in all malocclusion groups.

Conclusions: The results indicate that common malocclusions, such as posterior crossbite, distal bite, excess overjet and deep bite, are characterized by deficient width of the maxillary dental arch in the deciduous and early mixed dentition.

Seq #286 - Post-natal Craniofacial Growth
9:00 AM-11:00 AM, Saturday, 9 March 2002 San Diego Convention Center Room 17A (Mezzanine Level)

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