Suzuki Shohei, Suzuki Rina, Seto Munetsugu, Hiroyasu Kazuhiko, Ogura Shin, Ueda Kazuhiko
Department of Crown and Bridge Prosthodontics, The Nippon Dental University School of Life Dentistry at Niigata, Niigata, Japan.
Oral Implant Care Unit, Niigata Hospital, The Nippon Dental University, Tokyo, Japan.
Odontology. 2025 Jan;113(1):274-282. doi: 10.1007/s10266-024-00972-8. Epub 2024 Jul 29.
This study aimed to ascertain the effects of the shape of stereolithographic models fabricated with a three-dimensional (3D) printer and the use of different types of liquid resin on the dimensional changes of these models over time, to obtain valuable information for determining the period for which such models can be used following fabrication. Stereolithography models with the shape of a large truncated cone or a small truncated cone were fabricated using liquid resin as surgical guides (Group G) or master casts (Group M). (four groups in total, each n = 11). The shapes of all experimental specimens were measured immediately after fabrication and 1 day, 1 week, 2 weeks, 3 weeks, 4 weeks, 2 months, 3 months, 6 months, 1 year, and 1.5 years later. The shape data collected immediately after fabrication were taken as baseline data, and the dimensional changes over time at each timepoint were calculated. No significant change from 1 day to 1 year after fabrication was observed in any of the groups, but the change after 1.5 years was significantly larger than the changes at the other timepoints (p < 0.001). Significantly larger changes were evident in Group M than in Group G at all timepoints (p < 0.001). These results suggested that, from the viewpoint of dimensional stability over time, stereolithographic models should be used within 1 year of fabrication, and that the type of liquid resin used for stereolithographic model fabrication may affect how its dimensions change over time.
本研究旨在确定使用三维（3D）打印机制造的立体光刻模型的形状以及不同类型液体树脂的使用对这些模型随时间的尺寸变化的影响，以获取有价值的信息，用于确定此类模型制造后可使用的期限。使用液体树脂制作了大截锥或小截锥形状的立体光刻模型，作为手术导板（G组）或母模（M组）。（共四组，每组n = 11）。在制造后立即以及1天、1周、2周、3周、4周、2个月、3个月、6个月、1年和1.5年后测量所有实验标本的形状。将制造后立即收集的形状数据作为基线数据，并计算每个时间点随时间的尺寸变化。在任何一组中，从制造后1天到1年均未观察到显著变化，但1.5年后的变化显著大于其他时间点的变化（p < 0.001）。在所有时间点，M组的变化均显著大于G组（p < 0.001）。这些结果表明，从随时间的尺寸稳定性角度来看，立体光刻模型应在制造后1年内使用，并且用于制造立体光刻模型的液体树脂类型可能会影响其尺寸随时间的变化情况。
