目的:本研究旨在评估颜色稳定性,水吸附,两种不同的3D打印系统(SLA和DLP)的显微硬度和水接触角,可能用于生产儿科和正畸牙科器具。
方法:SLA和DLP打印机系统总共生产了160个磁盘样品,其直径为15.00mm,高度为2.00mm。在蒸馏水中评估了64个样品的颜色变化,咖啡,还进行了焦炭和樱桃汁和维氏显微硬度测试。在水接触角评估后保持溶解度和水吸附。使用SPSS软件进行统计分析。Mann-Whitney-U测试,进行Friedman试验和Bonferroni事后多重比较试验。
结果:在DLP和SLA组中,咖啡在评估期具有统计学上显著的着色效应(分别为P=.001,20.09±2.96,22.09±3.51),在所有终点,SLA组咖啡的变色效果均较高(P<0.05)。同时,在T0-T1和T0-T7中,DLP受焦炭溶液的影响更大(P<0.05)。与SLA相比,DLP组的吸水率值显示出统计学上的显着差异(分别为P=.01,121.11±10.54,92.78±8.70)。在SLA和DLP组的溶解度值和水接触角之间没有检测到统计学意义。SLA打印机的显微硬度值显示出统计学上明显高于DLP组(P=.001),并且在浸入期之后,SLA组的显微硬度值下降(P=.022)。
结论:暴露于染色溶液的比较组显示在所有时期颜色变化高于临床可接受值(ΔE00=2.25)。
OBJECTIVE: This
study aimed to assess the colour stability, water sorption, microhardness and water contact angle of two different 3D printing systems (SLA and DLP) in a possible use of producing paediatric and orthodontic dental appliances.
METHODS: SLA and DLP printer systems produced a total of 160 disk samples with a diameter of 15.00 mm and a height of 2.00 mm. Colour changes of 64 samples were assessed in distilled water, coffee,
coke and cherry juice and Vicker\'s microhardness tests were also conducted. Solubility and water sorption were held following the water contact angle assessment. Statistical analyses were performed using the SPSS software. Mann-Whitney-U test, Friedman test and Bonferroni post hoc Multiple Comparison Test were performed.
RESULTS: In DLP and SLA groups, coffee had a statistically significant colouring effect regarding the assessment periods (P = .001, 20.09 ± 2.96, 22.09 ± 3.51, respectively), and the discolouration effect of coffee was higher in the SLA group at all endpoints (P < .05). At the same time, DLP was more affected by
coke solution in T0-T1 and T0-T7 (P < .05). The values of water sorption showed statistically significant differences in the group of DLP compared to the SLA (P = .01, 121.11 ± 10.54, 92.78 ± 8.70, respectively). No statistical significance was detected between the solubility values and water contact angle of SLA and DLP groups. The SLA printer\'s microhardness values revealed statistically significantly higher values than the DLP group (P = .001) and a decrease was detected following the immersion period in the microhardness values of the SLA group (P = .022).
CONCLUSIONS: The compared groups exposed to staining solutions revealed colour changes above the clinically acceptable values at all periods (ΔE00 = 2.25).