Comparison of Bolton analysis and Little's irregularity index on laser scanned three-dimensional digital study models with conventional study models

[摘要] Three-dimensional digital study models were introduced following advances in digital technology. This study was carried out to assess the reliability of digital study models scanned by a laser scanning device newly assembled. The aim of this study was to compare the digital study models and conventional models. Twelve sets of dental impressions were taken from patients with mild-to-moderate crowding. The impressions were taken twice, one with alginate and the other with polyvinylsiloxane. The alginate impressions were made into conventional models, and the polyvinylsiloxane impressions were scanned to produce digital models. The mesiodistal tooth width and Little's irregularity index (LII) were measured manually with digital calipers on the conventional models and digitally on the digital study models. Bolton analysis was performed on each study models. Each method was carried out twice to check for intra-observer variability. The reproducibility (comparison of the methods) was assessed using independent-sample t-tests. The mesiodistal tooth width between conventional and digital models did not significantly differ (p > 0.05). Independent-sample t-tests did not identify statistically significant differences for Bolton analysis and LII (p = 0.603 for Bolton and p = 0894 for LII). The measurements of the digital study models are as accurate as those of the conventional models.

[发布机构] Department of Orthodontics, Faculty of Dentistry, Universitas Indonesia, Jakarta, Indonesia^1

[效力级别] 医药卫生 [学科分类] 卫生学

[关键词] Conventional models;Digital technologies;Independent samples;Intra-observer variability;Irregularity index;Laser scanning device;Reproducibilities;Statistically significant difference