Can the intra-examiner variability of Little's Irregularity Index be improved using 3D digital models of study casts?

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

doi:10.1016/j.jdent.2013.08.020

Cited by 18 publications

(7 citation statements)

References 27 publications

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“…Previous studies described an excellent reproducibility for digital measurements in DDM and CBCT. 10,20,27,[31][32][33][34] The results from this present study confirm those findings for 3D dental linear displacements with similar values for DDM and CBCT methods, as measured at the mesiobuccal cusp of the first molars, canine tip and incisal surface of the incisors.…”

Section: Discussionsupporting

confidence: 89%

“…19,21,22 Therefore, methodologies that can offer an alternative for the CBCT examination started to be proposed. DDMs show an accurate 3D image of the clinical crown and are reliable for measuring tooth size, arch dimensions and irregularity index [31][32][33][34] and some recent works even suggested the prediction of root position from it. 11,23,24 However, when comparing the changes in mesiodistal and buccolingual angulation using the clinical crown (DDM) and the whole tooth (CBCT), the present study showed that the results were significantly different for most of the variables assessed (Table 1).…”

Section: Discussionmentioning

confidence: 99%

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Comparison of linear and angular changes assessed in digital dental models and cone‐beam computed tomography

Massaro

Losada

Cevidanes

et al. 2019

Orthod Craniofacial Res

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Objective-To compare the three-dimensional (3D) linear displacements and the mesiodistal and buccolingual angulation changes after orthodontic treatment in digital dental models (DDMs) and 3D models derived from cone-beam computed tomography (CBCT). Settings and Sample Population-Digital dental model and CBCT scans were selected from 24 adults who had undergone orthodontic treatment for mandibular anterior crowding. Material and Methods-3D linear displacements and changes in angular measurements (mesiodistal and buccolingual angulation) were assessed in pre-and posttreatment DDM and CBCT images using the software ITK-snap and 3D SlicerCMF. Intra-and inter-rater agreement of measurements in DDM and CBCT were tested using the intraclass correlation coefficient (ICC).

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Comparison of linear and angular changes assessed in digital dental models and cone‐beam computed tomography

Massaro

Losada

Cevidanes

et al. 2019

Orthod Craniofacial Res

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“…Although this index can be influenced greatly by a single tooth and may not detect vertical Angle Orthodontist, Vol 88, No 3, 2018 discrepancies, it is traditionally applied to this type of study. 13,14 Transverse widths of the digital models were measured by a dentist rater who was blinded as to which wire was used in each patient. Canine measurements were made from cusp tip to cusp tip, and molar measurements were made from central fossa to central fossa.…”

Section: Methodsmentioning

confidence: 99%

Comparison of changes in irregularity and transverse width with nickel-titanium and niobium-titanium-tantalum-zirconium archwires during initial orthodontic alignment in adolescents: A double-blind randomized clinical trial

Nordstrom

Shoji

Anderson

et al. 2018

The Angle Orthodontist

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Objectives: The purpose of this prospective, double-blind, randomized clinical trial was to compare the clinical efficiency of nickel-titanium (NiTi) and niobium-titanium-tantalum-zirconium (TiNbTaZr) archwires during initial orthodontic alignment. Materials and Methods: All subjects (ages between 12 and 20 years) underwent nonextraction treatment using 0.022-inch brackets. All patients were randomized into two groups for initial alignment with 0.016-inch NiTi archwires (n ¼ 14), or with 0.016-inch TiNbTaZr archwires (n ¼ 14). Digital scans were taken during the course of treatment and were used to compare the improvement in Little's Irregularity Index and the changes in intercanine and intermolar widths. Results: There was approximately a 27% reduction in crowding during the first month with the use of 0.016-inch TiNbTaZr (Gummetal) wire, and an additional 25% decrease in crowding was observed during the next month. There was no significant difference between the two treatment groups in the decrease in irregularity over time (P ¼ .29). There was no significant difference between the two groups in the changes in intercanine and intermolar width (P ¼ .80). Conclusions: It can be concluded that Gummetal wires and conventional NiTi wires possess a similar ability to align teeth, and Gummetal wires have additional advantages over conventional NiTi, such as formability and use in patients with nickel allergy. (Angle Orthod. 2018;88:348-354.)

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“…The use of digital models has many advantages over plaster models: handling and storage are easier; measurements are faster; and data can be transferred directly to another electronic database, eliminating possible errors due to manual transcription. In addition, measurements made on plaster models and digital models were proved to be equally accurate ( 19 , 20 ), whereas other authors found digital models even more accurate and reproducible ( 21 ). This was confirmed by the excellent intra-rater agreement found in the present study.…”

Section: Discussionmentioning

confidence: 91%

Post-orthodontic position of lower incisors and gingival recession: A retrospective study

et al. 2017

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BackgroundTo evaluate if changes in lower incisor position following orthodontic treatment are correlated with development of gingival recessions.Material and MethodsPre- and post-treatment digital models and lateral cephalograms of 22 subjects were collected retrospectively. The clinical crown length, gingival scallop, and papilla height of the central lower incisor were measured along with the cephalometric incisor’s inclination, the distance from the mandibular plane, and the distance between the Infradentale and Menton points. Statistical correlations between gingival and cephalometric variables were studied. In addition, two groups were defined based on the post-treatment incisor inclination value (‘normal’ or ‘proclined’) and compared.ResultsThe incisor inclination was correlated with the change in gingival scallop and papilla height. Moreover, there was a statistically significant difference in clinical crown height and gingival scallop between the ‘normal’ group and the ‘proclined’ group.ConclusionsChanges in lower incisor position, especially an excessive proclination, after orthodontic treatment may play a role in the development of gingival recession. Key words:Orthodontic treatment, Incisor inclination, IMPA, Gingival recession, Alveolar bone.

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Can the intra-examiner variability of Little's Irregularity Index be improved using 3D digital models of study casts?

Cited by 18 publications

References 27 publications

Comparison of linear and angular changes assessed in digital dental models and cone‐beam computed tomography

Comparison of linear and angular changes assessed in digital dental models and cone‐beam computed tomography

Comparison of changes in irregularity and transverse width with nickel-titanium and niobium-titanium-tantalum-zirconium archwires during initial orthodontic alignment in adolescents: A double-blind randomized clinical trial

Post-orthodontic position of lower incisors and gingival recession: A retrospective study

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