氟磷灰石
材料科学
玻璃离子水门汀
粘结强度
纳米-
氟化物
极限抗拉强度
复合材料
扫描电子显微镜
水泥
胶粘剂
复合数
核化学
化学工程
磷灰石
化学
工程类
无机化学
图层(电子)
作者
Jun Lin,Jiajun Zhu,Xiaoxia Gu,Wenjian Wen,Qingshan Liu,H Fischer-Brandies,Huiming Wang,Christian Mehl
标识
DOI:10.1016/j.actbio.2010.10.029
摘要
This study aimed to investigate the fluoride release properties and the effect on bond strength of two experimental adhesive cements. Synthesized particles of nano-fluorapatite (nano-FA) or nano-fluorohydroxyapatite (nano-FHA) were incorporated into a resin-modified glass ionomer cement (Fuji Ortho LC) and characterized using X-ray diffraction and scanning electron microscopy. Blocks with six different concentrations of nano-FA or nano-FHA were manufactured and their fluoride release properties evaluated by ultraviolet spectrophotometry. The unaltered glass ionomer cement Fuji Ortho LC (GC, control) and the two experimental cements with the highest fluoride release capacities (nano-FA + Fuji Ortho LC (GFA) and nano-FHA + Fuji Ortho LC (GFHA)) were used to bond composite blocks and orthodontic brackets to human enamel. After 24 h water storage all specimens were debonded, measuring the micro-tensile bond strength (μTBS) and the shear bond strength (SBS), respectively. The optimal concentration of added nano-FA and nano-FHA for maximum fluoride release was 25 wt.%, which nearly tripled fluoride release after 70 days compared with the control group. GC exhibited a significantly higher SBS than GFHA/GFA, with GFHA and GFA not differing significantly (P > 0.05). The μTBS of GC and GFA were significantly higher than that of GFHA (P ⩽ 0.05). The results seem to indicate that the fluoride release properties of Fuji Ortho LC are improved by incorporating nano-FA or nano-FHA, simultaneously maintaining a clinically sufficient bond strength when nano-FA was added.
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