Digital Models for the Analysis of Little’s Irregularity Index in Subjects with a Different Degree of Crowding: A Reproducibility Study

Applied Sciences

Stefano Martina¹  Riccardo Nucera²  Vincenzo Ronsivalle³  Giuseppe Palazzo³  Grazia Fichera³  Lorenzo Rustico³  Paola Campagna³ 

[1] Department of Orthodontics, School of Dentistry, University of Naples Federico II, Via Pansini 5, 40, 80138 Naples, Italy;Section of Orthodontics, Department of Biomedical and Dental Sciences and Morphofunctional Imaging, University of Messina, Via Consolare Valeria 1, 98123 Messina, Italy;Unit of Orthodontics, Department of General Surgery and Surgical-Medical Specialties, School of Dentistry, University of Catania, Via S. Sofia 78, 95124 Catania, Italy;

关键词: digital models;    Little’s index;    space analysis;    arch length discrepancy;    dental crowding;    digital dentistry;   

DOI  :  10.3390/app10207108

来源: DOAJ

【 摘 要 】

Background: To investigate the accuracy and reproducibility of digital measurements of Little’s Irregularity Index and to evaluate if different degrees of dental crowding could influence these measurements. Methods: The study included 40 dental models and 5 sub-groups were created according to the severity of the crowding. In both the digital models and the study cast, Little’s Irregularity Index was recorded by measuring (1) the mesiodistal width of each tooth and (2) the arch lengths in both the maxillary and mandibular jaw. Two operators performed measurements on plaster and digital models using, respectively, a digital caliper and OrthoAnalyzerTM 3D software (3Shape A/S, Copenhagen, Denmark). Statistical analysis was performed to assess intra- and inter-operator variability, the accuracy between manual and digital measurements and if the amount of crowding could affect the accuracy of the digital measurements. Results: Concerning intra-examiner reliability, no statistically significant differences were detected (p > 0.05). In the maxillary and mandibular arch, the Intraclass Correlation Coefficient (ICC) value was 0.996 and 0.997 for the analogic measurements and 0.998 and 0.978 for the digital measurements. For the maxillary arch, the mean difference between the analogic and digital Little’s Irregularity Index (LII) measurements was 0.43 mm while for the mandibular arch the mean difference was 0.24 mm, showing some overestimation of the digital measurements (p < 0.05). No differences were found according to crowding subgroups (p > 0.05). Conclusions: Digital measurements of LII could be considered as a valid substitute of the gold standard analogical measurement.

【 授权许可】

Unknown