abstractsObjective To determine the influence of chin on extraction in borderline cases.Methods Pre-treatment lateral cephalograms of 50 treated patients (25 first premolar extraction cases, 25 non-extraction cases) were collected and digitized. The average pre-treatment age was 16.5 years (15～18 years). 19 cephalometric parameters were used for assessment. Comparison was made between extraction and non-extraction orthodontic treatment in borderline cases. The correlation analysis, t-test and Logistic regression analysis were used. Results Significant hard tissue changes were found between extraction and non-extraction cases. Extraction cases had smaller chin prominence. Logistic regression analysis showed that the probability of orthodontic extraction was significantly correlated with Pog-NB. Conclusions The important factor in determining extraction in borderline cases was the prominence of the chin. The probability of orthodontic extraction decreased with the increasing chin prominence.
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