Overbite Depth Indicator (ODI) and Anteroposterior Dysplasia Indicator (APDI) Cephalometric Norms for an Adult Nigerian population

Abstract

Background: Vertical and sagittal jaw relationships have been evaluated in the past using the Overbite Depth Indicator
(ODI) and the Anteroposterior Dysplasia Indicator (APDI) measurements, respectively. These values have been studied
in different populations, but there is a paucity of data among Nigerians. The aim of this study was to determine the mean
ODI and APDI values in a young adult Nigerian population and to compare this with the values for Black American and
Caucasian populations.
Methods: The cephalometric radiographs of 73 young adult Nigerians aged 18-25 years, with normal occlusion and no prior
orthodontic treatment, were used. All radiographs were manually traced to determine the value of the ODI and APDI angles.
The mean values for both angles were computed. Students' t-tests were used to assess for gender differences and to compare
the mean ODI and APDI values between the Nigerian population studied, with African American and Caucasian populations,
respectively.
Results: 0
The mean age of the study participants was 21.67±2.3. The mean ODI and APDI angles recorded were 69.39 +
0 0 0
7.2 and 82.51 +4.7 , respectively. There were no significant gender differences recorded for both angles.
Conclusion: Findings from this study showed the values for ODI/APDI were slightly similar in overall range to those of
the African American population, even though the mean values were slightly lower in the Nigerian population