Department of Prosthetic Dentistry, University Hospital, LMU Munich, 80336 Munich, Germany.
Department of Prosthetic Dentistry, University Hospital, LMU Munich, 80336 Munich, Germany.
Dent Mater. 2020 Mar;36(3):420-430. doi: 10.1016/j.dental.2020.01.009. Epub 2020 Jan 30.
To test and compare five pressable lithium-X-silicate-ceramics on their mechanical and wear properties.
Specimens were pressed and prepared from: i. Amber Press (AP), ii. Celtra Press (CP), iii. Initial LiSi Press (IL), iv. Livento Press (LP), and v. IPS e.max Press (IE). Four-point flexural strength (FS), SEVNB fracture toughness (K), three-body wear (3BW), Martens hardness (HM) and indentation modulus (E) were measured. For CP, FS and HM were measured with and without additional Power Firing. Each subgroup contained 15 specimens. Data were analyzed using Kolmogorov-Smirnov, one-way ANOVA followed by Scheffé test, Kruskal-Wallis-H-, Mann-Whitney-U-, and Spearman-Rho-test (p < 0.05). The Weibull modulus was calculated using the maximum likelihood estimation method.
AP and CP presented higher FS than IL. LP presented the highest Weibull modulus. CP showed lower K values than AP, and AP was not significant compared to LP and IE. The most 3BW material loss was observed for CP. CP revealed higher HM values than the remaining ceramics. IL presented lower E compared to AP and CP. The following correlations were observed between the test parameters: 3BW with FS (r = 0.279, p = 0.015), with HM (r = -0.378, p = 0.001), and with E (r = -0.344, p = 0.004); E with FS (r = 0.203, p = 0.028); and HM with FT (r = -0.223, p = 0.027) and E (r = 0.884, p < 0.001). No correlations were observed between FS and K (r = 0.046; p = 0.346).
AP followed by LP showed the highest and IL followed by CP the lowest properties tested. Power Firing of CP improved the flexural strength. Ceramics with high flexural strength and Martens parameters showed lower wear. Materials with high Martens hardness presented lower fracture toughness values and ones with high indentation modulus showed high flexural strength.
测试和比较五种可加压锂硅酸盐陶瓷的机械和磨损性能。
从以下材料中压制和制备试件：i. Amber Press (AP)、ii. Celtra Press (CP)、iii. Initial LiSi Press (IL)、iv. Livento Press (LP) 和 v. IPS e.max Press (IE)。测量四点弯曲强度 (FS)、SEVNB 断裂韧性 (K)、三体磨损 (3BW)、马氏体硬度 (HM) 和压痕模量 (E)。对于 CP，在有和没有额外的 Power Firing 的情况下测量 FS 和 HM。每个亚组包含 15 个样本。使用 Kolmogorov-Smirnov、单向方差分析 followed by Scheffé 检验、Kruskal-Wallis-H-、Mann-Whitney-U- 和 Spearman-Rho-检验（p<0.05）分析数据。威布尔模数通过最大似然估计法计算。
AP 和 CP 的 FS 高于 IL。LP 呈现出最高的威布尔模数。CP 的 K 值低于 AP，而 AP 与 LP 和 IE 相比没有显著差异。CP 的磨损量最大。CP 的 HM 值高于其余陶瓷。IL 的 E 值低于 AP 和 CP。观察到以下测试参数之间的相关性：3BW 与 FS (r = 0.279, p = 0.015)、HM (r = -0.378, p = 0.001) 和 E (r = -0.344, p = 0.004)；E 与 FS (r = 0.203, p = 0.028)；HM 与 FT (r = -0.223, p = 0.027) 和 E (r = 0.884, p<0.001)。FS 与 K 之间无相关性 (r = 0.046; p = 0.346)。
AP 之后是 LP 表现出最高的性能，IL 之后是 CP 表现出最低的性能。CP 的 Power Firing 提高了弯曲强度。弯曲强度和马氏体参数较高的陶瓷磨损较低。马氏体硬度较高的材料断裂韧性值较低，压痕模量较高的材料弯曲强度较高。
