Abstract
This study aimed to assess the reproducibility of linear measurements performed in dental models produced via intraoral scanning and three-dimensional (3D) printing using digital light processing (DLP) and fused deposition modeling (FDM). A sample of 22 participants was selected for this study. Intraoral scanning was performed in each participant with TRIOS™ (3Shape A/S™, Copenhagen, Denmark) device. The digital models were 3D printed using DLP and FDM techniques. Using a caliper, intraoral linear measurements were performed in situ (on the surface of participant’s teeth) and on the 3D printed models. The measurements taken intraoral and on the models were compared using the Intraclass Correlation Coefficient (ICC). The correlation between measurements taken in situ and on DLP models was poor (<0.4), while between in situ and FDM it ranged from poor to satisfactory (<0.75). Generalized linear model showed that the differences did not reach statistically significant levels (p>0.05). According to Bland-Altman approach, the size of measurements did not bias the outcomes. The intraoral scanning and 3D printing techniques used in this study enabled the reproducibility of linear measurements, however, discrete distortions that might be clinically significant occurred.
Highlights
Dental casts are well-known components of the armamentarium of Dentistry
The most significant contribution of this technology relies in the orthodontic practice – in which precision becomes the core goal to be achieved for fabricating orthodontic appliances
Descriptive statistics showed that the mean maxillary intercanine measurements reached 35.68 (±3.09), 36.05 (±2.05), and 34.95 (±3.24) mm in intraoral, digital light processing (DLP) and fused deposition modeling (FDM) analyses, respectively, while for the same analyses the mean maxillary intermolar measurements reached 53.34 (±3.71), 53.64 (±4.06), and 52.61 (±3.97) mm
Summary
Dental casts are well-known components of the armamentarium of Dentistry. This clinical tool is designed to support treatment planning and follow-up (Wutzl et al 2009; Pacheco et al 2019; Di Ventura et al 2019; Franco et al 2019). Dental casts were built-up in plaster from dental impressions through a conventional technique consolidated over the last decades. The inherent distortion that eventually occurs from the manual manipulation of dental impression and casts gained space in the spotlight of interest in dental science (Garino & Garino 2002; Sanches et al 2013; Vitti et al 2013). The analysis and navigation on dental surfaces enabled a computer-guided interaction with the patient and a dynamic prediction and simulation of orthodontic movement (Nabbout & Baron 2017; Mangano et al 2017)
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