目的:评估使用不同的三维(3D)打印机和打印方向制造的各种牙齿制剂的增材制造上颌定形铸模的制造真实性。
方法:上颌类型,其牙齿准备用于后位3单元固定局部义齿,侧切牙冠,中门牙和犬科贴面,第一前磨牙和第二磨牙嵌体,第一个磨牙牙冠用工业扫描仪数字化。此扫描文件用于使用数字光处理(DLP)或立体光刻(SLA)3D打印机在不同方向(0度,30度,45度,和90度)(n=7)。所有的演员都用同一个扫描仪数字化,并对每个制备部位的偏差进行了评估。统计学分析采用广义线性模型(α=0.05)。
结果:3D打印机和打印方向之间的相互作用影响了所有制剂中的测量偏差(P≤0.001),除了侧切牙牙冠和犬类贴面(P≥0.094),仅受到主要因素的影响(P<0.001)。DLP-90主要导致最高,而DLP-0主要导致后牙预备中的最低偏差(P≤0.014)。DLP-30导致第一前磨牙嵌体内的最小偏差,DLP-45导致中央门牙贴面准备内的最小偏差(P≤0.045)。
结论:在DLP-0或DLP-30的情况下,受试铸型的后端制剂的真实性最高,而在DLP-45的情况下,中切牙贴面制剂的真实性最高。DLP-90导致大多数牙齿准备的真实性最低。
结论:使用测试的DLP3D打印机制造的具有牙齿准备的最终铸型以及在牙齿准备时调整的打印方向可以实现良好的修复。然而,使用此3D打印机应避免90度打印方向,因为它导致了最低的制造真实性。
To evaluate the fabrication trueness of additively manufactured maxillary definitive casts with various tooth preparations fabricated with different 3-dimensional (3D) printers and print orientations.
A maxillary typodont with tooth preparations for a posterior 3-unit fixed partial denture, lateral incisor crown, central incisor and canine veneers, first premolar and second molar inlays, and a first molar crown was digitized with an industrial scanner. This scan file was used to fabricate definitive casts with a digital light processing (DLP) or stereolithography (SLA) 3D printer in different orientations (0-degree, 30-degree, 45-degree, and 90-degree) (n = 7). All casts were digitized with the same scanner, and the deviations within each preparation site were evaluated. Generalized linear model analysis was used for statistical analysis (α = 0.05).
The interaction between the 3D printer and the print orientation affected measured deviations within all preparations (P ≤ 0.001) except for the lateral incisor crown and canine veneer (P ≥ 0.094), which were affected only by the main factors (P < 0.001). DLP-90 mostly led to the highest and DLP-0 mostly resulted in the lowest deviations within posterior tooth preparations (P ≤ 0.014). DLP-30 led to the lowest deviations within the first premolar inlay and DLP-45 led to the lowest deviations within the central incisor veneer preparation (P ≤ 0.045).
Posterior preparations of tested casts had the highest trueness with DLP-0 or DLP-30, while central incisor veneer preparations had the highest trueness with DLP-45. DLP-90 led to the lowest trueness for most of the tooth preparations.
Definitive casts with tooth preparations fabricated with the tested DLP 3D printer and the print orientation adjusted on tooth preparation may enable well-fitting restorations. However, 90-degree print orientation should be avoided with this 3D printer, as it led to the lowest fabrication trueness.