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Abstract

The purpose of this research is to compare the arch changes after non-extraction orthodontic treatment on the mandibular crowding dentition between self-ligating and conventional bracket systems. Seventy-one samples that satisfied the criteria were selected from the patient database, including forty samples in the conventional bracket group and thirty-one in the self-ligating bracket group. Pre-treatment and post-treatment intercanine width, interpremolar width, intermolar width, arch perimeter and arch length were measured from the study cast, and angulation and position of mandibular incisors were measured from the cephalometric radiograph. The result showed that after non-extraction treatment on the crowding mandibular dentition, increases in the arch transverse dimension, arch perimeter, arch length, and proclination and protrusion of the mandibular incisors were observed for both groups. The self-ligating group showed a statistically greater transverse expansion and less increase in the proclination and protrusion of the mandibular incisors than the conventional group.

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