Int J Prosthodont. 2020 Nov/Dec;33(6):634-640. doi: 10.11607/ijp.6634.
To investigate the influence of different postpolymerization strategies and artificial aging periods on the Martens hardness parameters of 3D-printed resin materials indicated for temporary use.
Disks made of four 3D-printed resin materials (n = 30 each) were additively manufactured and postpolymerized with three different postpolymerization devices (n = 10 specimens of each material per device). Disks cut from a prefabricated milling material served as a control. The Martens parameters (ie, Martens hardness [HM] and indentation modulus [E]) were measured initially and after 14- and 28-day storage periods in 37°C distilled water. The data were statistically analyzed using univariate analysis, Kolmogorov Smirnov test, and nonparametric tests, including Kruskal-Wallis, Mann-Whitney U, and Wilcoxon tests (α = .05).
The highest impact on the Martens parameters was exerted by material (HM: η = 0.957, E: η = 0.967, P < .001), followed by postpolymerization device (HM: η = 0.557, E: η = 0.496, P < .001) and duration of water storage (HM: η= 0.068, E: η= 0.038, P < .001). The values for HM ranged between 108 and 282 N/mm, and for E between 2.89 and 7.73 kN/mm. The materials 3Delta Etemp and Temp PRINT showed the highest HM and E values regardless of the postpolymerization device and water storage duration (P < .001). In contrast, NextDent C&B, followed by Freeprint Temp, showed the lowest HM and E values (P < .001). The milled control group Telio CAD ranged between the two lower groups.
Postpolymerization strategy has a high impact on the mechanical properties of 3D-printed resin materials. Materials with a higher filler content showed better results regarding the Martens parameters. Such materials might be an alternative to conventional materials for the milling procedure.
研究不同后聚合策略和人工老化时间对临时使用的 3D 打印树脂材料的马氏硬度参数的影响。
用四种 3D 打印树脂材料（n = 30）制造圆盘，并使用三种不同的后聚合设备（n = 10）对其进行后聚合。从预制铣削材料中切下的圆盘作为对照。初始测量马氏参数（即马氏硬度[HM]和压痕模量[E]），然后在 37°C 蒸馏水中储存 14 天和 28 天后再次测量。使用单变量分析、Kolmogorov Smirnov 检验和非参数检验（包括 Kruskal-Wallis、Mann-Whitney U 和 Wilcoxon 检验）对数据进行统计分析（α =.05）。
对马氏参数的影响最大的是材料（HM：η = 0.957，E：η = 0.967，P <.001），其次是后聚合设备（HM：η = 0.557，E：η = 0.496，P <.001）和水储存时间（HM：η = 0.068，E：η = 0.038，P <.001）。HM 的值范围在 108 到 282 N/mm 之间，E 的值范围在 2.89 到 7.73 kN/mm 之间。无论后聚合设备和水储存时间如何，材料 3Delta Etemp 和 Temp PRINT 均显示出最高的 HM 和 E 值（P <.001）。相比之下，NextDent C&B 紧随其后，Freeprint Temp 显示出最低的 HM 和 E 值（P <.001）。Telio CAD 铣削对照组位于两个低值组之间。
后聚合策略对 3D 打印树脂材料的机械性能有很大影响。具有更高填料含量的材料在马氏参数方面显示出更好的结果。此类材料可能是传统材料铣削程序的替代材料。
