Dönmez Mustafa Borga, Fink Annina Lea, Demirel Münir, Diken Türksayar Almira Ada, Orgev Ahmet, Çakmak Gülce, Yilmaz Burak
Department of Reconstructive Dentistry and Gerodontology, University of Bern, Bern, Switzerland; Department of Prosthodontics, Faculty of Dentistry, Biruni University, Istanbul, Turkey.
Department of Reconstructive Dentistry and Gerodontology, University of Bern, Bern, Switzerland.
J Dent. 2025 Aug 8;162:106028. doi: 10.1016/j.jdent.2025.106028.
To compare the dimensional stability of dentate, maxillary, bio-based resin casts with various base designs and storage conditions to that of casts in a dental resin.
Dentate maxillary casts with either solid or hollow bases were additively manufactured using liquid crystal display technology from reference design files using a soy-based (EX), a corn-based (FD), and a dental cast (KM) resin (N = 20). Each set of casts was divided into two subgroups based on storage conditions (exposed to light or stored in light-proof boxes) (n = 10). Casts were digitized with a laboratory scanner the day after fabrication and weekly for the following four weeks. The scans were superimposed over their respective reference file to calculate region-based (anterior, posterior, entire arch, soft tissue, and entire cast) root mean square (RMS) values. Data were analyzed using a generalized linear model (α = 0.05).
The RMS values were affected from the interactions among resin type, base design, and storage condition (P ≤ 0.018). Hollow-based KM casts stored in a light-proof box had the lowest anterior, posterior, and entire arch RMS, and mostly had lower overall RMS (P < 0.001). Hollow-based FD casts exposed to light mostly had lower soft tissue RMS (P ≤ 0.019).
Hollow-based KM casts stored in a light-proof box mostly had higher dimensional stability. However, the deviations observed across all casts remained within previously reported clinically acceptable thresholds for diagnostic and orthodontic applications.
比较具有不同基底设计和储存条件的牙列完整的上颌生物基树脂模型与牙科树脂模型的尺寸稳定性。
使用液晶显示技术，根据参考设计文件，采用大豆基（EX）、玉米基（FD）和牙科铸造（KM）树脂，增材制造具有实心或空心基底的牙列完整的上颌模型（N = 20）。每组模型根据储存条件（暴露于光照或储存在遮光箱中）分为两个亚组（n = 10）。模型在制作后第二天用实验室扫描仪进行数字化处理，并在接下来的四周每周进行一次。将扫描结果与各自的参考文件进行叠加，以计算基于区域（前部、后部、整个牙弓、软组织和整个模型）的均方根（RMS）值。使用广义线性模型分析数据（α = 0.05）。
RMS值受树脂类型、基底设计和储存条件之间相互作用的影响（P≤0.018）。储存在遮光箱中的空心基底KM模型在前部、后部和整个牙弓的RMS最低，且总体RMS大多较低（P < 0.001）。暴露于光照下的空心基底FD模型大多具有较低的软组织RMS（P≤0.019）。
储存在遮光箱中的空心基底KM模型大多具有更高的尺寸稳定性。然而，所有模型观察到的偏差仍在先前报道的诊断和正畸应用临床可接受阈值范围内。
