Quantitative evaluation of printing accuracy of multi-color and multi-hardness three-dimensional printing dental model with photopolymer jetting
10.3760/cma.j.cn112144-20210315-00120
- VernacularTitle:多色多硬度牙颌模型感光聚合物喷射一体化三维打印精度初探
- Author:
Yanru SHEN
1
;
Hu CHEN
;
Kenan MA
;
Yuchun SUN
Author Information
1. 北京大学口腔医学院·口腔医院口腔医学数字化研究中心 口腔修复教研室 国家口腔医学中心 国家口腔疾病临床医学研究中心 口腔数字化医疗技术和材料国家工程实验室 国家卫生健康委口腔医学计算机应用工程技术研究中心 口腔数字医学北京市重点实验室 100081
- Keywords:
Dental models;
Computer-aided design;
Three-dimensional printing;
Photopolymer jetting;
Multi-color;
Multi-hardness
- From:
Chinese Journal of Stomatology
2021;56(7):652-658
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To quantitatively evaluate the accuracy of multi-color and multi-hardness dental models printed by using the photopolymer jetting (PJ) technology, and to provide protocol for the clinical application.Methods:A maxillary partially edentulous (Kennedy class Ⅱ subclass 1) standard digital model obtained through scanning and processing was selected as reference data. Five monochromatic DLP (digital light processing) models with single hardness were printed by printer DLP-800d based on DLP technology (DLP group), and five multi-color and multi-hardness PJ models were printed by printer J300Plus based on PJ technology (PJ group). Scan the printed model and register the scanning data to the reference data in Geomagic Studio 2013 software. The three-dimensional (3D) deviations of the whole and each area, including residual dentition, abutments adjacent to the edentulous area, gingiva, gingiva in the distal-extended edentulous area, gingiva in other edentulous areas, gingiva supporting the removable partial denture (RPD), were calculated and represented by the root mean square error (RMS) value. The smaller the RMS value was, the higher the trueness of printing was. The scanning data of the five models in the same group were registered in pairs to calculate the 3D deviation. The smaller the RMS value was, the higher the precision of printing was. The threshold of clinical acceptability was 200 μm. Statistical analysis was performed to compare the difference of trueness and precision between the two groups.Results:The overall trueness of the DLP group [57.70 (2.10) μm] was significantly better than that of the PJ group [71.00 (7.70) μm]. The overall precision of the DLP group [15.20 (5.05) μm] was significantly better than that of the PJ group [37.55 (15.55) μm]. The overall trueness and precision of both groups were within the clinically acceptable range.Conclusions:The domestic PJ printer used in this study can print multi-color and multi-hardness dental models with good trueness and precision, which can provide integrated 3D printing technology support for realizing the simulation of regional hardness differentiation between soft and hard tissues of dental models.
