Zhang Mindi, Su Qilong, Diao Kaixuan, Bi Wenya, Yan Zhuoqun, Luo Yi, Ren Guanghui
Dental Technology, School of Stomatology, Binzhou Medical University, Yantai, Shandong, China.
UPCERA Collaborative Research Center, Liaoning Upcera Co., Ltd., Shenyang, China.
Dent Mater. 2025 Aug;41(8):926-937. doi: 10.1016/j.dental.2025.05.008. Epub 2025 Jun 3.
To evaluate mechanical properties and wear resistance of resin-matrix ceramics reinforced with mechanically produced boron nitride nanosheets (BNNSs) MATERIALS AND METHODS: BNNSs were dispersed using a mechanical ball-milling technique and incorporated into resin-matrix ceramics at 0.3 %, 0.5 %, 0.7 %, and 0.9 % (wt%). Three-point flexural strength, microhardness, and fracture toughness of the materials were assessed to evaluate the mechanical properties of the resin-matrix ceramics, evaluating the optical properties of resin-matrix ceramics by measuring transmittance, while the wear coefficient and wear rate were measured to determine their wear characteristics. Scanning electron microscopy was employed to analyze the fracture toughness tested sections and wear test surfaces.
Mechanical properties, transmittance, and wear were differently affected by different concentrations of BNNSs. Flexural strength and microhardness were higher at 0.5 wt% BNNSs group, which increased by 18.04 % and 19.8 % respectively when compared with the control group. While fracture toughness increased as BNNSs concentration also increased. Under the condition of 0.9 wt% BNNSs group, the value is larger, which increased by 73.3 % compared to the control group. The transmittance decreased with the addition of BNNSs, with the 0.9 wt% BNNSs group exhibiting a 22.49 % reduction compared to the control group. At 0.5 % BNNSs group, the wear rate was comparatively low, which was 31 % lower than that of the control group. At 0.5 wt% BNNSs group, the wear coefficient is the smallest, at 0.42. SEM analysis suggested that BNNSs reduced the peeling of the filler.
This study provides an opportunity for the application of nanotechnology in the mechanical properties of resin-matrix ceramics and has the potential to contribute to a new generation of restorative materials in clinical treatment.
评估机械法制备的氮化硼纳米片（BNNSs）增强树脂基陶瓷的力学性能和耐磨性。
采用机械球磨技术分散BNNSs，并以0.3%、0.5%、0.7%和0.9%（重量）的比例掺入树脂基陶瓷中。评估材料的三点弯曲强度、显微硬度和断裂韧性以评价树脂基陶瓷的力学性能，通过测量透光率评估树脂基陶瓷的光学性能，同时测量磨损系数和磨损率以确定其磨损特性。采用扫描电子显微镜分析断裂韧性测试截面和磨损测试表面。
不同浓度的BNNSs对力学性能、透光率和磨损的影响各不相同。BNNSs含量为0.5%（重量）的组弯曲强度和显微硬度较高，与对照组相比分别提高了18.04%和19.8%。而断裂韧性也随BNNSs浓度的增加而增加。在BNNSs含量为0.9%（重量）的组中，该值更大，与对照组相比增加了73.3%。透光率随BNNSs的添加而降低，BNNSs含量为0.9%（重量）的组与对照组相比降低了22.49%。在BNNSs含量为0.5%的组中，磨损率相对较低，比对照组低31%。在BNNSs含量为0.5%（重量）的组中，磨损系数最小，为0.42。扫描电子显微镜分析表明，BNNSs减少了填料的剥落。
本研究为纳米技术在树脂基陶瓷力学性能方面的应用提供了契机，有潜力为临床治疗中的新一代修复材料做出贡献。
