Alrahlah Ali
Department of Restorative Dental Science, King Saud University Riyadh, Kingdom of Saudi Arabia, Phone: +00966114678304, e-mail:
J Contemp Dent Pract. 2018 Jan 1;19(1):13-19. doi: 10.5005/jp-journals-10024-2205.
The aim was to perform comparative analysis of bioactive, contemporary bulk-fill resin-based composites (RBCs) and conventional glass-ionomer materials for flexural strength (FS), diametral tensile strength (DTS), and Vickers hardness number (VHN) in the presence of thermocycling.
Five restorative materials [Tetric N-Ceram Bulk Fill; smart dentin replacement (SDR) Flowable Material; Bioactive restorative material (ACTIVA Bulk Fill); Ketac Universal Aplicap; and GC Fuji II] were evaluated for DTS, FS, and VHN. Half the samples in each material group were ther-mocycled. The DTS was performed under compressive load at a cross-head speed of 1.0 mm/min. The FS was assessed by three-point bending test at a cross-head speed of 0.5 mm/min. The VHN was determined using a Vickers diamond indenter at 50 gf load for 15 seconds. Differences in FS, DTS, and VHN were analyzed using analysis of variance (ANOVA) and Tukey post hoc tests at a = 0.05 level of significance.
N-Ceram, ACTIVA, and SDR demonstrated the highest and comparable (p > 0.05) FS. The SDR had the highest DTS value (141.28 ± 0.94), followed by N-Ceram (136.61 ± 1.56) and ACTIVA (129.05 ± 1.78). Ketac had the highest VHN value before and after thermocycling.
ACTIVA showed mechanical properties (FS and DTS) comparable with bulk-fill resin composite materials. ACTIVA showed potential for durability, as VHN was comparable post-thermocycling.
Bioactive materials showed acceptable DTS and FS values. However, hardness was compromised compared with included materials. ACTIVA Bulk Fill shows potential for dentin replacement but it needs to be covered with a surface-resistant restorative material. Further studies to improve surface characteristics of ACTIVA Bulk Fill are recommended.
本研究旨在对具有生物活性的当代大体积充填树脂基复合材料（RBCs）和传统玻璃离子材料在热循环条件下的弯曲强度（FS）、径向拉伸强度（DTS）和维氏硬度值（VHN）进行对比分析。
对五种修复材料[Tetric N-Ceram大体积充填材料；智能牙本质替代物（SDR）可流动材料；生物活性修复材料（ACTIVA大体积充填材料）；Ketac通用型糊剂；以及GC Fuji II]进行DTS、FS和VHN评估。每个材料组的一半样本进行热循环处理。DTS在压缩载荷下以1.0毫米/分钟的十字头速度进行测试。FS通过三点弯曲试验以0.5毫米/分钟的十字头速度进行评估。使用维氏金刚石压头在50克力载荷下持续15秒测定VHN。采用方差分析（ANOVA）和Tukey事后检验在α = 0.05显著性水平下分析FS、DTS和VHN的差异。
N-Ceram、ACTIVA和SDR表现出最高且相当（p > 0.05）的FS。SDR的DTS值最高（141.28 ± 0.94），其次是N-Ceram（136.61 ± 1.56）和ACTIVA（129.05 ± 1.78）。Ketac在热循环前后的VHN值最高。
ACTIVA的力学性能（FS和DTS）与大体积充填树脂复合材料相当。由于热循环后的VHN相当，ACTIVA显示出耐久性潜力。
生物活性材料显示出可接受的DTS和FS值。然而，与纳入的材料相比，硬度有所降低。ACTIVA大体积充填材料显示出替代牙本质的潜力，但需要用表面抗性修复材料覆盖。建议进一步研究以改善ACTIVA大体积充填材料的表面特性。
