Nonextraction (n=20) Extraction (n=21)   p   Sig   Mean SD Mean SD     Maxillary intercanine width 34.15 2.90 35.37 2.92 0.189 NS Maxillary intermolar width 52.85 3.88 52.50 3.33 0.760 NS Mandibular intercanine width 29.63 1.59 30.61 1.51 0.052 NS Mandibular intermolar width 53.01 2.52 53.08 2.84 0.929 NS NS indicates not significant; SD, standard deviation. * P <.05.

Table 1: Comparison of Pretreatment Maxillary and Mandibular Intercanine and Intermolar Arch Widths(mm).