Lower Dental Arch Widths Changes Following Fixed Orthodontic Treatment

  • Mohd Zambri M Makhbul
  • Wan Nurazreena Wan Hassan Department of pediatric Dentistry and Orthodontics, Faculty of Dentistry, University of Malaya

Abstract

To determine the number of cases that are at risk of poor stability in terms of arch width changes following fixed appliances treatment at the Orthodontic Unit, Klinik Pergigian Cahaya Suria, Kuala Lumpur. In a retrospective audit, 101 pre- and post-treatment lower study casts were selected from cases completed in the year 2015 at the Orthodontic Unit, Klinik Pergigian Cahaya Suria, Kuala Lumpur. Samples were measured using a universal caliper by a single calibrated operator. Samples was categorised as extraction or non-extraction types. Arch width changes was determined using paired T-test. The recommended limit was 0mm for inter-canine width, 2 mm for inter-first premolar width and 3mm for inter-second premolar and inter-molar width. Differences were considered “within limits”, if the changes were within the recommended limit ±0.25mm (for possible marginal measurement error) and “expanded”, if above the range for within limits. 42.6% were non-extraction while 57.4% were extraction cases. In the non-extraction group, 52.2% cases had expanded inter-canine widths, followed by inter-first and second premolars (27.9%) and interfirst molar (20.9%) widths. Arch width changes for the inter-first and second premolars and inter-molars widths were statistically significantly different (p<0.05) but bot clinically significant. In the extraction group, 67.2% had expanded inter-canine widths, followed by inter-first premolar (64.3%), inter-second premolar (9.1%) and inter-first molar (5.2%) widths. The inter-canine (M=1.43; SD=2.71, p<0.05) and inter-first premolar (M=2.87; SD=2.61, p<0.05) widths statistically and clinically significant expansion but the intersecond premolar and molar were significantly contracted (p<0.05). The number of cases with expanded arch widths was high regardless of the extraction type.

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Published
2018-06-30
How to Cite
MAKHBUL, Mohd Zambri M; WAN HASSAN, Wan Nurazreena. Lower Dental Arch Widths Changes Following Fixed Orthodontic Treatment. Annals of Dentistry University of Malaya, [S.l.], v. 25, n. 1, p. 17-22, june 2018. ISSN 2462-2060. Available at: <https://adum.um.edu.my/article/view/13626>. Date accessed: 16 july 2019.
Section
Original/Research Article