Department of Dentistry, Federal University of Rio Grande Do Norte (UFRN), Natal, Rio Grande Do Norte, Brazil.
J Indian Prosthodont Soc. 2023 Oct-Dec;23(4):356-362. doi: 10.4103/jips.jips_130_23.
The aim of this study was to evaluate the accuracy of models of partially edentulous arches obtained by three-dimensional (3D) printing.
This was an in vitro study.
Fifteen partially edentulous models were evaluated, using two methods of measuring dimensions: virtual, using the Standard Tessellation Language files of the models and software (control group), and physical, through printing the models and digital caliper (test group). For both methods, measurements were made regarding the dimensions of the teeth (width and length - buccal/lingual or palatal/occlusal) and distances between the teeth.
For the variable of linear measurements (width and length) and distances between teeth of the same hemiarch, the Wilcoxon test was used, while for the variable between opposite hemiarches, the paired t-test was used.
In the evaluation of the linear measurements, a significant difference was observed only when the width of the molar tooth was analyzed (P = 0.014). When the buccal length was measured, all teeth had linear measurements provided by the virtual method that was lower than the physical (P = 0.000), as well as the lingual/palatal length in incisors (P = 0.003) and molars (P = 0.009) and in total (P = 0.001). As for the analyses between teeth, no difference was identified between the measurements provided by the virtual method compared to the physical one.
The 3D printer used to print partially edentulous models provided linear distortions in the teeth but without changes in the distances between teeth of the same hemiarch and between teeth of opposite hemiarches.
本研究旨在评估通过三维（3D）打印获得的部分无牙颌模型的准确性。
这是一项体外研究。
评估了 15 个部分无牙颌模型，使用两种测量尺寸的方法：虚拟方法，使用模型的标准细分语言文件和软件（对照组），以及物理方法，通过打印模型和数字卡尺（测试组）。对于这两种方法，均对牙齿的尺寸（颊/舌或腭/牙合向的宽度和长度）和牙齿之间的距离进行了测量。
对于同一半颌的线性测量变量（宽度和长度）和牙齿之间的距离，使用 Wilcoxon 检验，而对于相对半颌的变量，则使用配对 t 检验。
在评估线性测量时，仅当分析磨牙的宽度时观察到显著差异（P = 0.014）。当测量颊舌长度时，虚拟方法提供的所有牙齿的线性测量值均低于物理方法（P = 0.000），以及切牙的颊舌/腭向长度（P = 0.003）和磨牙（P = 0.009）以及总长度（P = 0.001）。至于牙齿之间的分析，虚拟方法提供的测量值与物理方法之间没有差异。
用于打印部分无牙颌模型的 3D 打印机提供了牙齿的线性失真，但同一半颌和相对半颌的牙齿之间的距离没有变化。
