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Effects of Structural Designs on the Accuracy, Dimensional Stability, and Material Consumption of Digital Light
Huan Liu1, Jiaying Wang2, Yanfang Zhao3
1Key laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Department of digital oral implantology and prosthodontics, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
Objective:
To evaluate the effects of 4 structural designs on the accuracy, long-term dimensional stability and material efficiency of digital light processing (DLP)-printed resin dental models.
Methods:
A reference digital cast was obtained by scanning a standard maxillary plaster model with a tabletop 3D scanner to create 4 types of structural designs, including complete palatal solid (CPS), complete palatal hollow (CPH), horseshoe-shaped solid (HSS) and horseshoe-shaped hollow (HSH) designs. Digital casts with 4 structural designs were printed with a 3D printer with DLP technology. Material consumption and printing time were recorded. Afterwards, the printed casts were scanned by using a scanner to obtain standard research digital casts. All of the reference models and research digital casts were imported into Geomagic software for comparison and analysis of trueness and precision. The dimensional stability of the resin-printed models with 4 distinct structures within 28 days was evaluated and analysed. Differences between the reference and research digital casts were quantitatively indicated by the root mean square (RMS) value.
Results:
On day 1, the HSS group exhibited the greatest trueness, whereas the CPS group exhibited the lowest precision. The solid models (CPS and HSS) remained stable over the 28 days. However, the hollow models (CPH and HSH) significantly deviated after 7 days. The HSS design reduced the printing time by 19%, and the material consumption by 30% compared to CPS.
Conclusion:
The structural design significantly influences the accuracy and dimensional stability of 3D-printed models. The HSS design offers the optimal balance between stability and material efficiency, thus making it clinically advantageous. The accuracy of the models in all of the groups remained within the clinically acceptable range.
Clinical Significance:
The structural design significantly influences model performance. The HSS design offers clinically advantageous for maxillary dental models.
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