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 Since extraction and nonextraction is a debatable topic to date, its effects on the changes in the dimension of arch width are unclear. Many investigators suggested that extraction would lead to arch collapse, whereas few others suggested that such changes in dimension would not occur. Aim and Objectives  To evaluate the changes in the intercanine and intermolar width in premolar extraction cases in class I and class II div 1 malocclusion cases. Materials and Methods The study included pretreatment and posttreatment study models of 25 patients (14 with class I malocclusion, 11 with class II division 1 malocclusion). Intercanine and intermolar widths were measured and evaluated for both the malocclusions. The difference posttreatment intercanine width and intermolar width between class I and class II division 1 malocclusion were also assessed. The values obtained were subjected to statistical analysis. Results There was no statistically significant difference in the intercanine and intermolar width pre- and posttreatment for class I patients, but there was a statistically significant difference in the intercanine and intermolar widths in class II patients. When class I and class II patients were compared for the parameters (intercanine/intermolar widths), it showed that there was no statistically significant difference.

Evaluation of Treatment Changes in the Maxillary Intercanine and Intermolar Width in Patients with Various Malocclusions: A Study Model Analysis