Estimating arch length discrepancy through Little's Irregularity Index for epidemiological use

European Journal of Orthodontics
Eduardo Bernabé, Carlos Flores-Mir

Abstract

The objective of this study was to evaluate the diagnostic capability of Little's Irregularity Index (LII) in order to estimate the arch length discrepancy (ALD) in a dental arch. Dental casts with a full permanent dentition, excluding third molars, from 200 12- to-16-year-old schoolchildren from a representative high school located in Lima, Peru, were used. Incisal irregularity was measured using the LII, whereas ALD was calculated as the difference between available and required space in each dental arch anterior to the first permanent molars. The receiver-operator characteristic (ROC) curve was used to contrast the LII with three different dichotomized ALDs and locate optimized cut-off points. Correlation between ALD and LII was -0.68 (P < 0.001). According to ROC curves, LIIs of 2.45, 4.00, and 4.55 mm were the optimized cut-off points to estimate negative ALDs higher than 0, 3, and 6 mm, respectively. LII's highest diagnostic capability was found for estimating negative ALD greater than 3 mm with a sensibility of 0.78 and a specificity of 0.76. Based on the present findings, LII could potentially be used in epidemiological surveys as a valid and less time-consuming measurement of crowding compared with ALD; however, furthe...Continue Reading

Citations

Aug 4, 2006·Head & Face Medicine·Eduardo Bernabé, Carlos Flores-Mir
Oct 19, 2012·The Angle Orthodontist·Avrum I GoldbergPeter H Buschang
Nov 22, 2016·The Angle Orthodontist·Mohammad Moaffak A AlSayed HasanOmar Hamadah
Nov 4, 2011·The Journal of Clinical Pediatric Dentistry·Iman Abdel IbrahimNadia M El Harouny
Mar 8, 2017·International Journal of Dentistry·J Antoszewska-SmithM Rzepecka-Skupień
Jan 8, 2019·Progress in Orthodontics·Luca LombardoGiuseppe Siciliani
Jan 15, 2016·BMC Oral Health·Timothy ShaughnessyDennis Ma
Dec 5, 2017·Progress in Orthodontics·Guilherme JansonMarcos Augusto Lenza

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