Al-Dulaijan Yousif A, Aldamanhori Rand, Algaoud Hadeel, Alshubaili Rand, Alkhateeb Reem, Alalawi Haidar, Abualsaud Reem, Alqarawi Firas K, Al-Qarni Faisal D, Gad Mohammed M
Department of Substitutive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia.
College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia.
Front Oral Health. 2024 Dec 12;5:1491984. doi: 10.3389/froh.2024.1491984. eCollection 2024.
The influence of printing parameters on the marginal and internal fit of three-dimensional (3D) printed interim fixed partial dentures (IFPDs) has been understudied. This investigation sought to elucidate the impact of printing orientation and post-curing time on these critical factors.
A total of 260 3-Unit IFDPs were printed using two different resins (130/NextDent C&B MFH and 130/ASIGA DentaTOOTH). For each material, specimens were printed with three different angulations (0-, 45-, and 90-degree in relation to the z-axis). Each was further divided into 4 groups ( = 10) according to post-curing time (30-, 60-, 90-, and 120 min), while the green state (GS) group at 0-degree remained without post-curing as a control. Each specimen was scanned and then superimposed on the original CAD file. The marginal and internal fit of premolar and molar restorations were evaluated using the silicone replica technique. Digital scanning of the master die, both with and without a fit checker, was followed by data superimposition to compare the master die with the fit checker of each sample. 3D comparisons were conducted using initial and best-fit alignment methods, and the root mean square error (RMS) was calculated to quantify marginal and internal fit at each abutment and for the overall restoration. Statistical analysis was performed using JMP® software (JMP®, Version 16, SAS Institute Inc., Cary, NC, USA, 1989-2022) with a significance level 0.05 for all tests.
For the ASIGA group, 0-degree orientation generally exhibited better fit than 45- and 90-degree orientations, with some variations based on post-cure time. For marginal fit, ASIGA crowns typically showed better results with 90-degree orientation, while NextDent crowns demonstrated consistent performance across orientations. Post-curing time also influenced marginal fit, with longer durations generally resulting in improved outcomes.
With different printing orientations and post-curing times, ASIGA and NextDent resins can produce IFDPs with acceptable internal and marginal fit. However, NextDent resin consistently outperformed ASIGA in terms of overall fit. Further research is needed to evaluate the long-term clinical performance of these materials.
三维（3D）打印临时固定局部义齿（IFPD）的打印参数对边缘适合性和内部适合性的影响尚未得到充分研究。本研究旨在阐明打印方向和后固化时间对这些关键因素的影响。
使用两种不同的树脂（130/NextDent C&B MFH和130/ASIGA DentaTOOTH）打印了总共260个3单位IFDP。对于每种材料，标本以三种不同的角度（相对于z轴为0度、45度和90度）进行打印。根据后固化时间（30、60、90和120分钟）将每组进一步分为4组（每组 = 10个），而0度的绿色状态（GS）组不进行后固化作为对照。对每个标本进行扫描，然后叠加在原始CAD文件上。使用硅树脂复制技术评估前磨牙和磨牙修复体的边缘适合性和内部适合性。对主模型进行数字扫描，包括有无贴合检查器的情况，然后进行数据叠加，以将主模型与每个样本的贴合检查器进行比较。使用初始和最佳拟合对齐方法进行三维比较，并计算均方根误差（RMS）以量化每个基牙和整个修复体的边缘适合性和内部适合性。使用JMP®软件（JMP®，版本16，SAS Institute Inc.，美国北卡罗来纳州卡里，1989 - 2022）进行统计分析，所有测试的显著性水平为0.05。
对于ASIGA组，0度方向通常比45度和90度方向表现出更好的适合性，但会因后固化时间而有所变化。对于边缘适合性，ASIGA牙冠通常在90度方向显示出更好的结果，而NextDent牙冠在各个方向上表现一致。后固化时间也会影响边缘适合性，较长的固化时间通常会带来更好的结果。
在不同的打印方向和后固化时间下，ASIGA和NextDent树脂可以生产出具有可接受的内部和边缘适合性的IFDP。然而，在整体适合性方面，NextDent树脂始终优于ASIGA。需要进一步研究来评估这些材料的长期临床性能。
