Dönmez Mustafa Borga, Soliva Clara Lisa, Al-Johani Hanan, Orgev Ahmet, Schimmel Martin, Çakmak Gülce, Yilmaz Burak
Department of Prosthodontics, Faculty of Dentistry, Biruni University, Istanbul, Turkey.
Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.
J Prosthodont. 2025 Sep 8. doi: 10.1111/jopr.70027.
This study aimed to compare the dimensional and positional deviations of additively manufactured removable dies fabricated using two bio-based resins and one conventional dental cast resin, while also evaluating these outcomes over a 4-week period.
A right mandibular first molar preparation on a typodont was scanned to digitally design removable dies and hollow partial arch casts. Based on a priori power analysis, a total of 30 dies (n = 10) and three hollow casts (n = 1) were fabricated using additive manufacturing (AM) from three different dental cast resins: DentaMODEL (DM), FotoDent bio-based model (CB), and soy-based resin (SB). The dies and their seated positions in casts were digitized 1 day (T0), 1 week (T1), 2 weeks (T2), 3 weeks (T3), and 4 weeks (T4) after fabrication. Dies' dimensional deviations (crown, root, base of the root, and overall) and positional deviations in casts (crown region surface and point-based) at T0 were defined as trueness, while deviations measured over 4 weeks (T0-T4) were defined as stability. The deviations measured at T0 were analyzed either using a generalized linear model (dimensional deviations) or one-way analysis of variance (crown region and point-based deviations). The deviations measured over the 4-week period were analyzed with generalized linear model analysis and Bonferroni-corrected post hoc tests (α = 0.05).
CB dies mostly had the lowest and SB dies mostly had the highest dimensional deviations (p ≤ 0.001). The crown region had the lowest dimensional deviations, while the dimensional deviations measured at T3 were higher than those at T2 and T4 (p ≤ 0.003). SB dies had the highest and CB dies had the lowest positional deviations, while crown region deviations were lower at T0 and T1 than at T4, and point-based deviations were lower at T0 than at T4 (p ≤ 0.049).
CB dies mostly had better dimensional and positional trueness and stability over 4 weeks. The changes in tested outcomes for all dies over time were small.
本研究旨在比较使用两种生物基树脂和一种传统牙科铸造树脂通过增材制造法制作的可摘局部义齿铸模的尺寸和位置偏差，同时在4周时间内对这些结果进行评估。
对一具牙模上的右下第一磨牙预备体进行扫描，以数字化方式设计可摘局部义齿铸模和中空局部牙弓铸型。基于先验功效分析，使用增材制造（AM）技术，从三种不同的牙科铸造树脂：DentaMODEL（DM）、FotoDent生物基模型树脂（CB）和大豆基树脂（SB）制作了总共30个铸模（n = 10）和三个中空铸型（n = 1）。在制作后的第1天（T0）、第1周（T1）、第2周（T2）、第3周（T3）和第4周（T4）对铸模及其在铸型中的就位位置进行数字化处理。将T0时铸模的尺寸偏差（牙冠、牙根、牙根基部和整体）以及在铸型中的位置偏差（牙冠区域表面和基于点的偏差）定义为准确性，而在4周（T0 - T4）内测量的偏差定义为稳定性。使用广义线性模型（尺寸偏差）或单因素方差分析（牙冠区域和基于点的偏差）对T0时测量的偏差进行分析。对4周期间测量的偏差进行广义线性模型分析和Bonferroni校正的事后检验（α = 0.05）。
CB铸模大多具有最低的尺寸偏差，而SB铸模大多具有最高的尺寸偏差（p≤0.001）。牙冠区域的尺寸偏差最低，而在T3时测量的尺寸偏差高于T2和T4时的偏差（p≤0.003）。SB铸模的位置偏差最高，CB铸模的位置偏差最低，而牙冠区域偏差在T0和T1时低于T4时，基于点的偏差在T0时低于T4时（p≤0.049）。
在4周时间内，CB铸模大多具有更好的尺寸和位置准确性及稳定性。所有铸模的测试结果随时间的变化很小。
