This scoping review of the literature comparing orthodontic treatment undertaken with and without the extraction of premolar teeth included 399 articles. Most study reports were of low methodological quality, and further reviews are unlikely to provide new information. Researchers should focus on high quality prospective primary studies that include outcomes of imortance to patients.
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This review of the the treatment duration required to achieve whole-arch alignment of the mandibular dentition using fixed appliances included 35 RCTs. The pooled duration for whole-arch alignment in the mandible was 263.0 days/8.8 months (95%CI: 6.2 to11.3 months). Mandibular incisor alignment was achieved in 100.7 days/3.4 months (95%CI: 2.8 to 3.9 months).
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52 studies were identified for this review of the effect of extraction or non-extraction fixed orthodontic treatment of soft tissue profiles . However they were mainly poor quality retrospective studies providing very low quality evidence suggesting that tooth extractions might be associated with differences in the soft tissue profile compared to non-extraction treatment.
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The aim of this study was to compare intermolar widths after alignment of crowded mandibular dental arches in non-extraction adolescent patients between conventional and self-ligating brackets. The trial included patients requiring non-extraction treatment in both arches, having all mandibular teeth erupted with no spaces in the mandibular arch, mandibular irregularity index from canine to canine [read the full story…]
