Abstract
Objective: To determine the relationship between the Index of Complexity, Outcome and Need (ICON) and Dental Aesthetic Index (DAI) in the assessment of orthodontic treatment complexity and need. Method s : A cross - sectional study was carried out. Pre - treatment dental casts of 150 consecutive patients from Lagos, Nigeria were assessed using the ICON and the DAI criteria. One investigator assessed all the models. In addition to descriptive statistics, the rel ationship between the ICON and DAI was examined by using non - parametric correlations (Spearman Rank Order and Pearson’s Product Moment Correlation Coefficient. Original Research Article
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