Resumo

MADHOO, A; JOHANNES, KC  e  HARRIS, AMP. A Comparison of Three Types of Orthodontic Study Models. S. Afr. dent. j. [online]. 2025, vol.80, n.9, pp.489-494. ISSN 0375-1562.  https://doi.org/10.17159/sadj.v80i09.21972.

Plaster study models have been the gold standard for many years but have many disadvantages. Intra-oral scanners and three-dimensional printers have provided alternatives in the form of digital and printed study models. Their accuracy for clinical use requires further validation. The aim of this research was to compare the accuracy of digital and printed study models with plaster study models. The objectives were to compare the accuracy of measurements obtained from digital and printed study models with those of plaster study models, to establish which type of study model yielded the most accurate measurements in comparison to plaster study models and to identify disadvantages associated with the use of these types of study models. A study sample of 50 patients attending a private orthodontic practice for treatment participated. Patients' participation was voluntary and informed consent was obtained from all patients. Dental impressions were taken from each patient and cast into plaster study models. Digital impressions using the 3Shape TRIOS® intra-oral scanner were taken for each patient and digital study models were generated and used to print study models using the Next Dent 5100 for Ceramill® 3D printer. Measurements were taken from each study model and respectively compared for accuracy. Only four of the 28 sets of observations were statistically significantly different, namely: mesio-distal widths of teeth 15 and 26, the inter-canine widths in the maxillary arches and the inter-molar widths in the maxillary arches. The researchers concluded that the measurements taken from digital and printed study models are as accurate as those taken from plaster study models and are accurate enough to be used in a clinical environment.

Palavras-chave : Digital study models; plaster study models; printed study models; intra-oral scanner; three-dimensional (3D) printer; accuracy; measurements; orthodontics.

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