Using Little's Irregularity Index in orthodontics: Outdated and inaccurate?

Macauley, Donal; Garvey, Thérèse M.; Dowling, Adam H.; Fleming, Garry J.P.

doi:10.1016/j.jdent.2012.09.010

Cited by 24 publications

(14 citation statements)

References 13 publications

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“…The Little's Irregularity Index (LII), the sum of the distances between four anterior teeth's anatomic contact points, is an important index used in the previous study of dentition crowding [22]. However, researches argued that the LII index did not have enough repeatability [23,24], so it could not meet the research requirements. Studies indicated that scanning models had better reliability than LII index [23].…”

Section: Discussionmentioning

confidence: 99%

“…However, researches argued that the LII index did not have enough repeatability [23,24], so it could not meet the research requirements. Studies indicated that scanning models had better reliability than LII index [23]. Sirona intraoral scanner was used to obtain the volunteer's digital dentition models and used iOrtho7.0 software to change the position of maxillary lateral incisors in this study.…”

Section: Discussionmentioning

confidence: 99%

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Aesthetic evaluation of the labiolingual position of maxillary lateral incisors by orthodontists and laypersons

Jiang

Cao

Yang

et al. 2020

Preprint

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BackgroundsThe maxillary anterior teeth play a crucial role in smile aesthetics. As for maxillary lateral incisors, most studies concentrated on its size, incisor edge level, inclination, et al. However, the aesthetic effect of lateral incisor movement in spatial position has not been studied yet. Therefore, the purpose of this study was to explore the influence of labiolingual position of maxillary lateral incisors on the aesthetic perception of orthodontists and laypersons and different gender groups.MethodsA photograph of a male's smile was selected. iOrtho7.0 software (Time Angel, Wuxi, China) was used to edit the three dimensional (3D) dental models. By referring to the 3D models, the photograph was digitally processed to create seven images with different labiolingual positions of the maxillary lateral incisors in 0.5 mm increments (+ indicates labial movement and -indicates lingual movement). Eighty-six orthodontists and one hundred sixty-one laypersons were asked to evaluate images using a visual analog scale. Data were analyzed by Student t-test and One-way analysis of variance with post hoc test.ResultsThere was no significant difference between the perception of males and females (P > 0.05). Orthodontists assigned lower scores to all images than laypersons. +1.5 mm was considered as the least attractive smile by orthodontists while + 1.5 mm and − 1.5 mm were regarded as the least attractive ones by laypersons. 0 mm was rated the most attractive by all judges (P < 0.05). Between the 0 mm and − 0.5 mm, laypersons observed the difference but orthodontists did not.ConclusionsThe labiolingual position of maxillary lateral incisors does affect the perception of smile esthetics. Although orthodontists gave lower score to each image than laypersons.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Aesthetic evaluation of the labiolingual position of maxillary lateral incisors by orthodontists and laypersons

Jiang

Cao

Yang

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…This may represent a limitation of the research, as this index is considered more appropriate for epidemiological studies rather than for clinical studies (36,37) estimating changes in tooth alignment (38). Attempts were made to overcome shortcoming of this methods using a high-precision caliper and estimating previously the intra-rater reliability and reproducibility.…”

Section: Discussionmentioning

confidence: 99%

Aligning Effectiveness, Secretion of Interleukin 1β and Pain Control During Fixed Orthodontic Treatment with Self-Ligating Appliances and Supplemental Vibrational Appliances. A Randomized Controlled Clinical Trial

Kalemaj¹,

Buti²,

Deregibus³

et al. 2017

J. Biomed

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Aims: The aims of the present study were to investigate rate of mandibular incisors alignment, levels of IL-1β and pain and discomfort during orthodontic alignment with the following: 1) conventional-ligating appliance (CLA); 2) self-ligating appliance (SLA); 3) self-ligating appliance combined to vibrational appliance (SLA-VA). Methods: This was a three-armed parallel group randomized clinical trial with allocation ratio 1:1:1. The main inclusion criteria were: full permanent dentition, age below 25 years, no missing teeth, first skeletal and molar class, non-extraction treatment, Little's Irregularity Index (LII) from 3mm to 6mm. The main outcomes were rate of mandibular incisors alignment, concentration of IL-1β and pain and discomfort. Measurements on models were performed at appliance placement (t0) and at monthly intervals for the first 3 months (T1, T2, T3), whereas IL-1β levels were measured at weekly intervals for the first 3 weeks (t1, t2, t3). Differences between groups for normally-distributed variables were initially estimated through Analyses of Variance (ANOVAs) tests, followed by Post-Hoc Scheffe analysis for pair wise comparisons. Results: Thirty-three patients were recruited and randomized with no lost to follow-up. During the first two months, faster alignment was observed for SLA (P=0.0491) and SLA-VA (P=0.0134) compared to CLA. At each time-point of measurement no differences were observed between SLA and SLA-VA. At t1 and t2 were found higher values of IL-1β for SLA-VA compared to SLA (P=0.0209, P=0.0352) and CLA (P=0.0018, P=0.0029), whereas at t3 the difference persisted only versus CLA (P=0.0304). No relevant differences in terms of pain and discomfort were observed between groups at any time point. Conclusions: Self-ligating appliances seem to perform better than conventional-ligating appliances in terms of timing of teeth leveling and alignment. Vibrational devices seem to enhance secretion of IL-1β but do not increase effectiveness of leveling and alignment with regard to treatment acceleration or pain reduction.

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“…Little deemed “crowding” to be one of the most ambiguous words used by orthodontists. The concept has long given rise to questions among practitioners, whether on account of its etiology, diagnosis, or management. For patients, it is the main reason for their initial consultation and remains a source of concern and discontent should things deteriorate following treatment.…”

Section: Introductionmentioning

confidence: 99%

A Protocol for Treatment of Minor Orthodontic Relapse During Retention

Brézulier

Turpin

Sorel

2016

J Esthet Restor Dent

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This article demonstrates the efficacy of a retainer used to correct incipient relapsing crowding. The esthetics of the anterior alignment is restored by means of an almost invisible device. This solution also permits functional guidance to be restored with minimal intervention on the dental tissues while avoiding conventional esthetic techniques involving lingual brackets. (J Esthet Restor Dent 28:359-366,2016).

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Using Little's Irregularity Index in orthodontics: Outdated and inaccurate?

Cited by 24 publications

References 13 publications

Aesthetic evaluation of the labiolingual position of maxillary lateral incisors by orthodontists and laypersons

Aesthetic evaluation of the labiolingual position of maxillary lateral incisors by orthodontists and laypersons

Aligning Effectiveness, Secretion of Interleukin 1β and Pain Control During Fixed Orthodontic Treatment with Self-Ligating Appliances and Supplemental Vibrational Appliances. A Randomized Controlled Clinical Trial

A Protocol for Treatment of Minor Orthodontic Relapse During Retention

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