通过添加二氧化钛纳米颗粒来提高牙科树脂的性能。

Improving performance of dental resins by adding titanium dioxide nanoparticles.

机构信息

American Dental Association Foundation, Paffenbarger Research Center, Gaithersburg, MD 20899-8546, USA.

出版信息

Dent Mater. 2011 Oct;27(10):972-82. doi: 10.1016/j.dental.2011.06.003. Epub 2011 Jul 19.

DOI:10.1016/j.dental.2011.06.003

PMID:21774976

Abstract

OBJECTIVE

The objective of this study is to improve the performance of dental resins by adding a small amount of titanium dioxide nanoparticles (TiO₂ NPs), which have outstanding mechanical properties and unique photoactivities.

METHODS

Acrylic acid modified TiO₂ NPs (AP25) were prepared and added to a mixture of bis-phenol-A-dimethacrylate and triethylene glycol dimethacrylate (mass ratio 1:1) at seven mass fractions. Disks made of these resins were subjected to FTIR microspectroscopy, nanoindentation, microindentation, and 3-point bending to determine the degree of vinyl conversion (DC) modulus and hardness. The shear bond strengths (SBS) of dentin adhesives containing various amount of AP25 were also examined.

RESULTS

The DC increased as a function of mass fraction of AP25 and reached a plateau at 0.1%. The DC of the resin mixture was improved by ≈7% up to 91.7 ± 0.8%. The elastic modulus and hardness of the composites increased initially as more AP25 were added, and decreased after reached the maximum value at approximately 0.06% mass fraction of AP25. The maximum elastic modulus was ≈48% higher than that of the NP-free resin, and the maximum hardness was more than twice higher than that of the NP-free resin. Using these resin composites as dental adhesives, the mean SBS using resins with 0.1% mass fraction of AP25 was ≈30% higher than those using NP-free resin.

SIGNIFICANCE

By adding a small amount of AP25 to the resin, the DC and the mechanical properties of resins were improved dramatically. These findings could lead to better performing dental adhesives.

摘要

目的

本研究的目的是通过添加少量具有优异机械性能和独特光活性的二氧化钛纳米粒子（TiO₂ NPs）来提高牙科树脂的性能。

方法

制备了丙烯酸改性的 TiO₂ NPs（AP25），并将其以七种质量分数添加到双酚 A 二甲基丙烯酸酯和三乙二醇二甲基丙烯酸酯（质量比为 1:1）的混合物中。将这些树脂制成圆盘，通过傅里叶变换红外光谱微区分析、纳米压痕、微压痕和三点弯曲试验，测定乙烯基转化率（DC）、模量和硬度。还研究了含有不同量 AP25 的牙本质粘结剂的剪切粘结强度（SBS）。

结果

DC 随 AP25 质量分数的增加而增加，并在 0.1%时达到平台。树脂混合物的 DC 提高了约 7%，达到 91.7±0.8%。复合材料的弹性模量和硬度最初随 AP25 添加量的增加而增加，在添加量约为 0.06%时达到最大值后降低。最大弹性模量比无 NP 树脂高约 48%，最大硬度比无 NP 树脂高两倍以上。使用这些树脂复合材料作为牙科粘结剂，AP25 质量分数为 0.1%的树脂的平均 SBS 比无 NP 树脂高约 30%。