Lee Jieun, Belles Donald, Gonzalez Maria, Kiat-Amnuay Sudarat, Dugarte Alba, Ontiveros Joe
Int J Prosthodont. 2022 March/April;35(2):240–244. doi: 10.11607/ijp.7246. Epub 2021 Feb 26.
To evaluate and compare the impact strength of 3D-printed resin to conventionally fabricated denture bases of heat-cured and cold-cured acrylic resin.
Denture base materials were evenly divided into three groups (n = 25 each; N = 75): (1) 3Dprinted material (Denture Base LP, Formlabs); (2) Heat-cured acrylic resin (Lucitone 199, Dentsply Sirona); and (3) cold-cured acrylic resin (Lucitone HIPA, Dentsply Sirona). The 3Dprinted specimens were designed through computer-aided design (CAD) software (Autodesk Meshmixer) with the dimensions 64 mm long, 12.7 mm wide, and 3.2 mm thick, then printed with a desktop stereolithography printer (Form 2, Formlabs). Heat-cured and cold-cured acrylic resin specimens were fabricated through conventional (compression and pouring) methods. The impact energy was read directly from the impact tester in joules, and the cross-sectional area of each specimen was used to calculate the impact strength in kJ/m. Analysis of variance, Tukey multiple comparisons test, and a likelihood ratio α = .05 were conducted.
The average mean impact strength was 8.9 kJ/m for heat-cured acrylic resin, 11.2 kJ/m for 3D-printed resin, and 14.9 kJ/m for cold-cured acrylic resin. Tukey multiple comparisons test showed that the impact strength for the cold-cured group was significantly greater than the 3D-printed resin and heat-cured acrylic resin groups.
Within the limitations of this study, the cold-cured acrylic (Lucitone HIPA) showed the greatest impact strength, followed by 3D-printed resin (Denture Base LP) and conventional heat-cured denture base materials (Lucitone 199), respectively.
评估并比较3D打印树脂与传统制作的热固化和冷固化丙烯酸树脂义齿基托的抗冲击强度。
将义齿基托材料平均分为三组（每组n = 25；N = 75）：（1）3D打印材料（Denture Base LP，Formlabs公司）；（2）热固化丙烯酸树脂（Lucitone 199，登士柏西诺德公司）；（3）冷固化丙烯酸树脂（Lucitone HIPA，登士柏西诺德公司）。通过计算机辅助设计（CAD）软件（Autodesk Meshmixer）设计3D打印试件，尺寸为长64 mm、宽12.7 mm、厚3.2 mm，然后用桌面立体光刻打印机（Form 2，Formlabs公司）打印。热固化和冷固化丙烯酸树脂试件通过传统方法（压制和灌注）制作。直接从冲击试验机上读取冲击能量，单位为焦耳，每个试件的横截面积用于计算抗冲击强度，单位为kJ/m²。进行方差分析、Tukey多重比较检验，显著水平α = 0.05。
热固化丙烯酸树脂的平均抗冲击强度为8.9 kJ/m²，3D打印树脂为11.2 kJ/m²，冷固化丙烯酸树脂为14.9 kJ/m²。Tukey多重比较检验表明，冷固化组的抗冲击强度显著高于3D打印树脂组和热固化丙烯酸树脂组。
在本研究的局限性范围内，冷固化丙烯酸树脂（Lucitone HIPA）显示出最大的抗冲击强度，其次分别是3D打印树脂（Denture Base LP）和传统热固化义齿基托材料（Lucitone 199）。
