Kul Esra, Ostovar Saba, Kahraman Seyhan, Yanıkoğlu Nuran, Yeşildal Faruk
Department of Prosthetic Dentistry, Faculty of Dentistry, Ataturk University, Erzurum, Turkey.
Departmet of Energy, Faculty of Engineering, Ataturk University, Erzurum, Turkey.
BMC Oral Health. 2025 Apr 4;25(1):488. doi: 10.1186/s12903-025-05868-9.
Limited information is available on the thickness and post-polymerization procedure of denture base resins produced by stereolithography (SLA). This study aims to assess the impact of varying thickness, post-curing durations, and temperature on the flexural strength and colour stability of 3D-printed denture bases.
A total of 80 rectangular specimens, measuring 65 × 10 × 3 mm and 65 × 10 × 2 mm, were developed using 3D-printed acrylic resin. The 3D-printed groups were further categorised based on their thickness into two groups: 2 mm and 3 mm. Each of these four groups was then subdivided based on the post-curing temperature (60 °C and 80 °C) and post-curing duration (15 min and 60 min). To ensure colour stability, the specimens were placed in an incubator containing a coffee solution at a temperature of 37 degrees Celsius. To evaluate the flexural strength of the specimens, they were placed on a specialised jig with two supports that were 50 mm apart. The jig was securely attached to a universal testing machine. The spectrophotometer was used to measure the colour changes (ΔE00) of the specimens that underwent different post-curing procedures and were immersed in coffee. The data analysis involved the use of ANOVA and Tukey's post hoc tests, with a significance level (α) set at 0.05.
The study's findings suggest that the flexural strength values exhibited an upward trend as the post-curing periods increased from 15 to 60 min and the temperatures rose from 40 °C to 80 °C. Group 2 and 4 showed the highest flexural strength (86 MPa and 95 MPa, respectively). Group 2 with less thickness than group 4 exhibited a better color stability and acceptable level of color change with ΔΕ00 = 2.59.
The study revealed that the specimens with a thickness of 3 mm, a post-curing period of 60 min, and a temperature of 80 °C exhibited the best flexural strength but the lowest colour stability compared to the other groups. Optimum results can be achieved by increasing the post polymerization time and temperature rather than increasing the thickness of the denture base. Because group 2, which has a thickness of 2 mm and is subjected to the same post-curing period, has acceptable clinical results in terms of both flexural strength and color stability.
Not applicable.
关于立体光刻（SLA）生产的义齿基托树脂的厚度和聚合后程序的信息有限。本研究旨在评估不同厚度、后固化持续时间和温度对3D打印义齿基托的弯曲强度和颜色稳定性的影响。
使用3D打印丙烯酸树脂制作了总共80个矩形试件，尺寸为65×10×3mm和65×10×2mm。3D打印组根据其厚度进一步分为两组：2mm和3mm。然后，这四组中的每一组再根据后固化温度（60°C和80°C）和后固化持续时间（15分钟和60分钟）进行细分。为确保颜色稳定性，将试件置于温度为37摄氏度的装有咖啡溶液的培养箱中。为评估试件的弯曲强度，将它们放置在两个支撑间距为50mm的专用夹具上。该夹具牢固地连接到万能试验机上。使用分光光度计测量经过不同后固化程序并浸泡在咖啡中的试件的颜色变化（ΔE00）。数据分析采用方差分析和Tukey事后检验，显著性水平（α）设定为0.05。
研究结果表明，随着后固化时间从15分钟增加到60分钟以及温度从40°C上升到80°C，弯曲强度值呈上升趋势。第2组和第4组显示出最高的弯曲强度（分别为86MPa和95MPa）。厚度小于第4组的第2组表现出更好的颜色稳定性，且颜色变化可接受，ΔΕ00 = 2.59。
研究表明，与其他组相比，厚度为3mm、后固化时间为60分钟、温度为80°C的试件表现出最佳的弯曲强度，但颜色稳定性最低。通过增加聚合后时间和温度而非增加义齿基托的厚度可获得最佳结果。因为厚度为2mm且经过相同后固化时间的第2组在弯曲强度和颜色稳定性方面均具有可接受的临床结果。
不适用。
