Laboratório de Materiais Dentários, Faculdade de Odontologia, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2492, Rio Branco, 90035-003, Porto Alegre, Brazil.
J Dent. 2017 Jul;62:85-90. doi: 10.1016/j.jdent.2017.05.013. Epub 2017 May 22.
This study aimed to evaluate the physical-chemical properties of experimental dental adhesives containing boron nitride nanotubes (BNNTs) as inorganic fillers.
An experimental adhesive resin was prepared using HEMA-BisGMA, 66/33wt% (control). Inorganic BNNT fillers were first analyzed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and then incorporated into the adhesive at different concentration (0.05, 0.075, 0.1, 0.15wt%). Degree of conversion (DC), ultimate strength, contact angle, surface free energy (SFE) microhardness, softening in solvent and bioactivity were assessed.
Scanning and transmission electron microscopy (SEM and TEM) showed BNNTs with diameter ranging from 5 to 10nm with close end tips. No changes in DC were observed after incorporating BNNTs up to 0.15wt%. The contact angles of water and α-bromonaphthalene increased (p<0.05) and consequently the SFE decreased after incorporating BNNTs to the polymer matrix. Microhardness and solvent degradation strength increased after incorporation of 0.075, 0.1 and 0.15wt% BNNTs. Mineral deposition was found after 7days of immersion on adhesive specimens after incorporation of BNNT.
The incorporation of BNNTs up to 0.15wt% improved the chemical and mechanical properties of dental adhesives and promoted mineral deposition.
Incorporation of boron nitride nanotubes into adhesive resin materials improved physical-chemical properties and increased mineral deposition on its surface allowing enhanced properties of the resin-dentin interface. Thus, the novel adhesive material is promising as a dental adhesive and may contribute to the stability of the dentin-resin bonding.
本研究旨在评估含有氮化硼纳米管（BNNTs）作为无机填料的实验性牙科胶粘剂的物理化学性质。
使用 HEMA-BisGMA、66/33wt%（对照）制备实验性胶粘剂树脂。首先使用扫描电子显微镜（SEM）和透射电子显微镜（TEM）分析无机 BNNT 填料，然后将其以不同浓度（0.05、0.075、0.1、0.15wt%）掺入胶粘剂中。评估转化率（DC）、极限强度、接触角、表面自由能（SFE）、显微硬度、溶剂软化和生物活性。
扫描和透射电子显微镜（SEM 和 TEM）显示 BNNTs 的直径为 5 至 10nm，具有闭合端。掺入 BNNTs 至 0.15wt%时，DC 没有变化。掺入 BNNTs 后，水和α-溴萘的接触角增加（p<0.05），因此聚合物基质的 SFE 降低。掺入 0.075、0.1 和 0.15wt% BNNTs 后，显微硬度和溶剂降解强度增加。在掺入 BNNT 后 7 天的浸泡后，在胶粘剂试件上发现了矿物质沉积。
掺入 BNNTs 至 0.15wt%提高了牙科胶粘剂的化学和机械性能，并促进了矿物质沉积。
将氮化硼纳米管掺入胶粘剂树脂材料中，改善了物理化学性质，并增加了其表面的矿物质沉积，从而增强了树脂-牙本质界面的性能。因此，新型胶粘剂材料有望成为牙科胶粘剂，并可能有助于稳定牙本质-树脂结合。
