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首页> 外文期刊>Journal of materials science >Effect of filler level and particle size on dental caries-inhibiting Ca-PO_4 composite
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Effect of filler level and particle size on dental caries-inhibiting Ca-PO_4 composite

机译：填料含量和粒径对抑制龋齿的Ca-PO_4复合材料的影响

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Secondary caries and restoration fracture are common problems in restorative dentistry. The aim of this study was to develop Ca-PO_4 nanocomposite having improved stress-bearing properties and Ca and PO_4 ion release to inhibit caries, and to determine the effects of filler level. Nanoparticles of dicalcium phosphate anhydrous (DCPA), two larger DCPA powders, and reinforcing whiskers were incorporated into a resin. A 6 × 3 design was tested with six filler mass fractions (0, 30, 50, 65, 70, and 75%) and three DCPA particle sizes (112 nm, 0.88 μm, 12.0 μm). The DCPA nanocomposite at 75% fillers had a flexural strength (mean ± SD; n = 6) of 114 ± 23 MPa, matching the 112 ± 22 MPa of a commercial non-releasing, hybrid composite (P > 0.1). This was 2-fold of the 60 ± 6 MPa of a commercial releasing control. Decreasing the particle size increased the ion release. Increasing the filler level increased the ion release at a rate faster than being linear. The amount of ion release from the nanocomposite matched or exceeded those of previous composites that released supersaturating levels of Ca and PO_4 and remin-eralized tooth lesions. This suggests that the much stronger nanocomposite may also be effective in remineralizing toothrnlesion and inhibiting caries. In summary, combining calcium phosphate nanoparticles with reinforcing co-fillers in the composite provided a way to achieving both caries-inhibiting and stress-bearing capabilities. Filler level and particle size can be tailored to achieve optimal composite properties.
机译：继发性龋齿和修复骨折是修复牙科的常见问题。这项研究的目的是开发具有改善的承压性能以及Ca和PO_4离子释放以抑制龋齿并确定填料含量的影响的Ca-PO_4纳米复合材料。将无水磷酸二钙（DCPA），两种较大的DCPA粉末和增强晶须的纳米颗粒掺入树脂中。测试了6×3设计，其中有六个填充剂质量分数（0、30、50、65、70和75％）和三个DCPA粒径（112 nm，0.88μm，12.0μm）。填充率为75％的DCPA纳米复合材料的抗弯强度（平均值±SD； n = 6）为114±23 MPa，与商用非释放性杂化复合材料的112±22 MPa相匹配（P> 0.1）。这是商业释放控件的60±6 MPa的2倍。减小粒径可增加离子释放。填料含量的增加使离子的释放速度快于线性。从纳米复合材料释放的离子数量与先前的复合材料相当或超过，后者释放了Ca和PO_4的过饱和水平并重新矿化了牙齿病变。这表明强得多的纳米复合材料也可能有效地使矿物质矿化和抑制龋齿。总之，在复合材料中将磷酸钙纳米颗粒与增强的辅助填料结合在一起可提供一种兼具抑制龋齿和承受压力的功能。可以调整填料含量和粒径，以实现最佳的复合性能。

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  • 来源
    《Journal of materials science》 |2009年第8期|1771-1779|共9页
  • 作者

    Hockin H. K. Xu; Michael D. Weir; Limin Sun; Scott Ngai; Shozo Takagi; Laurence C. Chow;

  • 作者单位

    Department of Endodontics, Prosthodontics and Operative Dentistry, University of Maryland Dental School, 650 West Baltimore Street, Baltimore, MD 21201, USA;

    Department of Endodontics, Prosthodontics and Operative Dentistry, University of Maryland Dental School, 650 West Baltimore Street, Baltimore, MD 21201, USA;

    Paffenbarger Research Center, American Dental Association Foundation, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;

    Paffenbarger Research Center, American Dental Association Foundation, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;

    Paffenbarger Research Center, American Dental Association Foundation, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;

    Paffenbarger Research Center, American Dental Association Foundation, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;

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