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  • Title: The pattern of malocclusion among orthodontic patients seen in Dental Centre, University College Hospital, Ibadan, Nigeria.
    Author: Onyeaso CO, Aderinokun GA, Arowojolu MO.
    Journal: Afr J Med Med Sci; 2002 Sep; 31(3):207-11. PubMed ID: 12751558.
    Abstract:
    The aim of this study was to analyse the malocclusion pattern among patients who presented for treatment in the Orthodontic Unit of the Dental Centre, University College Hospital, Ibadan, as baseline data for proper treatment planning, teaching and further research. A total of 289 subjects aged 5-34 years with mean age of 10.6 +/- 1.5 (S.D.) years were seen. Angle's classification of molar relationships among those seen is as follows: class I - 76.5%, Class II - 15.5% and Class III - 8.0%. There was increased overjet in 16.2% of the patients, reduced overjet in 0.7% while 2.1% had reversed overjet. Other occlusal abnormalities included: increased overbite (3.8%), reduced overbite (1.4%); anterior open bite (5.2%; crossbite (8.4%) and scissorsbite (0.6%). Crowding, spacing and retained primary incisors constituted 29.7%, 1.4% and 40.1%, respectively. Delayed eruption of canine (1.0%), Bimaxillary protrusion (0.7%), incompetent lips (0.7%), supernumerary teeth (0.7%) malformed tooth (0.3%), mandibular deviation on closure (1.0%) and oral habits (4.5%) were other forms of malocclusion diagnosed. Males were found to have significantly more of classes II and III molar relationships than females (P < 0.05). Occurrence of retained primary teeth as well as overjet deviations from normal were significantly higher in females (P < 0.05). No significant sex differences were found in the other occlusal disorders (P > 0.05): The findings were comparable with previous epidemiological surveys in other parts of the country.
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