Negovetic Mandic Visnja, Plancak Laura, Marovic Danijela, Tarle Zrinka, Trutina Gavran Milena, Par Matej
Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia.
School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia.
Materials (Basel). 2024 Jun 6;17(11):2777. doi: 10.3390/ma17112777.
This study aimed to evaluate the micro-mechanical and macro-mechanical properties of self-cured and light-cured alkasite and to investigate how accelerated degradation in acidic, alkaline, and ethanol solutions affects the macro-mechanical properties of self-cured and light-cured alkasite. The specimens of the alkasite material (Cention Forte, Ivoclar Vivadent) were prepared according to the following three curing modes: (1) light-cured immediately, (2) light-cured after a 5-min delay, and (3) self-cured. Microhardness was tested before and after immersion in absolute ethanol to indirectly determine crosslink density, while flexural strength and flexural modulus were measured using a three-point bending test after accelerated aging in the following solutions: (1) lactic acid solution (pH = 4.0), (2) NaOH solution (pH = 13.0), (3) phosphate-buffered saline solution (pH = 7.4), and (4) 75% ethanol solution. The data were statistically analyzed using a two-way ANOVA and Tukey post hoc test. The results showed that the microhardness, flexural strength, and flexural modulus were significantly lower in self-cured specimens compared to light-cured specimens. A 5-min delay between the extrusion of the material from the capsule and light curing had no significant effect on any of the measured properties. A significant effect of the accelerated aging solutions on macro-mechanical properties was observed, with ethanol and alkaline solutions having a particularly detrimental effect. In conclusion, light curing was preferable to self-curing, as it resulted in significantly better micro- and macro-mechanical properties, while a 5-min delay between mixing the capsule and light curing had no negative effects.
本研究旨在评估自凝型和光固化型碱硅玻璃离子水门汀的微观力学和宏观力学性能，并研究在酸性、碱性和乙醇溶液中的加速降解如何影响自凝型和光固化型碱硅玻璃离子水门汀的宏观力学性能。碱硅玻璃离子水门汀材料（Cention Forte，义获嘉伟瓦登特公司）的试件按照以下三种固化方式制备：（1）立即光固化；（2）延迟5分钟后光固化；（3）自凝固化。在浸入无水乙醇前后测试显微硬度，以间接确定交联密度，而在以下溶液中加速老化后，使用三点弯曲试验测量弯曲强度和弯曲模量：（1）乳酸溶液（pH = 4.0）；（2）氢氧化钠溶液（pH = 13.0）；（3）磷酸盐缓冲盐水溶液（pH = 7.4）；（4）75%乙醇溶液。数据采用双向方差分析和Tukey事后检验进行统计学分析。结果表明，与光固化试件相比，自凝固化试件的显微硬度、弯曲强度和弯曲模量显著更低。从胶囊中挤出材料与光固化之间延迟5分钟对任何测量性能均无显著影响。观察到加速老化溶液对宏观力学性能有显著影响，乙醇和碱性溶液的影响尤为有害。总之，光固化优于自凝固化，因为它能产生明显更好的微观和宏观力学性能，而在混合胶囊与光固化之间延迟5分钟没有负面影响。
