Accuracy of 3-dimensional printed dental models reconstructed from digital intraoral impressions

Abstract

Introduction: A rapidly advancing digital technology in orthodontics is 3-dimensional (3D) modeling and printing, prompting a transition from a more traditional clinical workflow toward an almost exclusively digital format. There is limited literature on the accuracy of the 3D printed dental models. The aim of this study was to assess the accuracy of 2 types of 3D printing techniques. Methods: Digital and alginate impressions of the oral environment were collected from 30 patients. Subsequently, digital impressions were used to print 3D models using digital light processing (DLP) and polyjet printing techniques, and alginate impressions were poured up in stone. Measurements for the 3 model types (digital, DLP, and polyjet) were compared with the stone models. Tooth measurements (first molar to first molar) included mesiodistal (crown width) and incisal/occlusalgingival (crown height). Arch measurements included arch depth and intercanine and intermolar widths. Intraobserver reliability of the repeated measurement error was assessed using intraclass correlation coefficients. Results: The intraclass correlation coefficients were high for all recorded measurements, indicating that all measurements on all model types were highly reproducible. There were high degrees of agreement between all sets of models and all measurements, with the exception of the crown height measurements between the stone and DLP models, where the mean difference was statistically significant. Conclusions: Both the DLP and polyjet printers produced clinically acceptable models and should be considered viable options for clinical application.

3d Images for Automated Digital Odontometry

“…There is a variety of opinions caused by implementing of different approaches for accuracy assessment, which, in its turn, depends largely on clinical or other applications being discussed in studies. Thus not only digital images but 3D printed models become acceptable for accuracy assessments, measurements carried out by digital calipers and comparisons (Brown et al, 2018). Similar studies, which have been carried out on dried mandibles are of particular interest due to their similarity to anthropological material (Jacob et al, 2015).…”

Accuracy of 3D-Printed Dental Models of Different Tooth Surfaces

“…Brown et al assessed the accuracy of 3Dprinting techniques by tooth and arch measurements and concluded that both the DLP and PolyJet printers were clinically acceptable, due to high degrees of agreement between the printed and stone models. 10 However, few investigations have focused on deviations of the different tooth regions (anterior and posterior teeth) and surfaces. This study compared deviations of 3D-printed models and reference models on buccal, lingual, and occlusal surfaces of anterior and posterior teeth.…”

“…The results showed that the volumetric changes in casts made by the conventional method were signi cantly smaller than those of 3D-printed casts. Brown et al 10 compared the tooth and arch measurements of three model types (digital, DLP, and PolyJet) with those of stone models Their results indicated high degrees of agreement among all types of models for all measurements, except the crown height measurements between the stone and DLP models. However, linear measurements indicate that the print model is consistent with the plaster model, but the results of linear measurements can demonstrate only that the 3D-printed model is suitable only for use in orthodontics study.…”

Study of the dimensional accuracy of jaw models obtained by 3d printing using stereolithography

“…Brown и соавт. [10] в своем исследовании по сравнительной оценке точности метода цифровой светодиодной проекции (DLP) и технологии PolyJet пришли к выводу, что полученные с помощью этих двух методов 3D-печати модели челюстей обладают высокой размерной точностью и в клинической практике могут служить заменой гипсовым моделям челюстей. S.J.…”