Biomaterials Department, Faculty of Dentistry, Ain Shams University (ASU), Biomaterials Research Laboratory, Organization of African Unity Street, El-Qobba Bridge, Al Weili, Cairo Governorate (P.O. 11566), Egypt.
Biomaterials Department, Faculty of Dentistry, Ain Shams University (ASU), Biomaterials Research Laboratory, Organization of African Unity Street, El-Qobba Bridge, Al Weili, Cairo Governorate (P.O. 11566), Egypt.
J Mech Behav Biomed Mater. 2024 Mar;151:106372. doi: 10.1016/j.jmbbm.2024.106372. Epub 2024 Jan 4.
This study investigated the impact of using γ-methacryloxypropyl trimethoxy silane (MPS) for surface silanization of poly (urea-formaldehyde) (PUF) microcapsules which enclose a healing liquid of "triethylene glycol dimethacrylate (TEGDMA) and N,N dihydroxyethyl-p-toluidine (DHEPT)" on some mechanical properties of an experimental dental composite as well as its self-healing efficiency.
Synthesis of PUF microcapsules was done via in situ polymerization, followed by silanization with MPS silane. Silanized and non-silanized microcapsules were incorporated into a composite containing 30% polymer matrix and 70% fillers at different weight percentages (0%, 5%, 7.5% and 10%). The composite strength and elastic modulus were evaluated by Flexural testing. Fracture toughness K and self-healing efficiency were assessed by utilizing the "single edge notched beam" method.
Flexural strength of all groups containing silanized microcapsules was non-significantly different from control group without microcapsules. However, in contrast to control group, all groups containing non-silanized microcapsules displayed considerably decreased flexural strength. Adding silanized and non-silanized microcapsules didn't show a significant change in the K. The silanized microcapsules' groups achieved a self-healing efficiency of about 49-77% recovery in K compared to 38-69% for their non-silanized counterparts.
In order to increase the interfacial adhesion with the polymer matrix, improve the mechanical properties, and increase the efficiency of self-healing of dental resin composite, PUF microcapsules were silanized for the first time in the dental field using MPS silane. This innovative silanized microcapsule-containing self-healing composite may hold promise for repairing the damage caused by restorative cracks and extending their service life.
本研究考察了γ-甲基丙烯酰氧基丙基三甲氧基硅烷（MPS）用于对包埋“三甘醇二甲基丙烯酸酯（TEGDMA）和 N,N-二羟乙基对甲苯胺（DHEPT）”愈合液的聚脲甲醛（PUF）微胶囊进行表面硅烷化处理对实验性牙科复合树脂某些机械性能及其自修复效率的影响。
通过原位聚合合成 PUF 微胶囊，然后用 MPS 硅烷进行硅烷化处理。将硅烷化和非硅烷化微胶囊以不同的重量百分比（0%、5%、7.5%和 10%）掺入含有 30%聚合物基质和 70%填料的复合材料中。通过弯曲测试评估复合材料的强度和弹性模量。通过利用“单边缺口梁”方法评估断裂韧性 K 和自修复效率。
所有含硅烷化微胶囊的组的弯曲强度与不含微胶囊的对照组无显著差异。然而，与对照组相比，所有含非硅烷化微胶囊的组的弯曲强度均显著降低。添加硅烷化和非硅烷化微胶囊对 K 没有显著变化。与非硅烷化微胶囊相比，硅烷化微胶囊组的 K 自修复效率约为 49-77%，而非硅烷化微胶囊组的 K 自修复效率约为 38-69%。
为了提高与聚合物基质的界面附着力、改善机械性能并提高牙科树脂复合材料的自修复效率，首次在牙科领域使用 MPS 硅烷对 PUF 微胶囊进行硅烷化处理。这种创新的含硅烷化微胶囊的自修复复合材料有望修复修复体裂纹造成的损伤并延长其使用寿命。
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