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首页> 外文期刊>International endodontic journal >Ion‐modified nanoparticles induce different apatite formation in cervical dentine
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Ion‐modified nanoparticles induce different apatite formation in cervical dentine

机译：离子改性的纳米颗粒在宫颈牙本质中诱导不同的磷灰石形成

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Abstract Aim To investigate if crystallinity and ultrastructure are modified when cervical dentine is treated with four different nanogels‐based solutions for remineralizing purposes. Methodology Experimental nanogels based on polymeric nanoparticles ( NP s) and zinc, calcium or doxycycline‐loaded NP s were applied to citric acid etched dentine to facilitate the occlusion of tubules and the mineralization of the dentine surface. Dentine surfaces were studied by X‐ray diffraction and transmission electron microscopy through selected area diffraction and bright‐field imaging. Results Crystals at the dentine surface were identified as hydroxyapatite with the highest crystallographic maturity and crystallite size in dentine treated with Zn‐ NP s‐based gel. Texture increased in all samples from 24?h to 7?days, except in dentine surfaces treated with Zn‐ NP s gel. Polyhedral, plate‐like and drop‐like shaped apatite crystals constituted the bulk of minerals in dentine treated with Zn‐ NP s gel, after 7?days. Polymorphic, cubic and needle‐like shaped crystals distinguished minerals, with more amorphous characteristics in dentine treated with Ca‐ NP s gel after 7?days than that found when Zn‐ NP s were applied. Doxycycline‐ NP s produced the smallest crystallites with poor crystallinity, maturity and chemical stability. Conclusions Crystalline and amorphous phases of newly formed hydroxyapatite were described in both types of dentine treated with Zn‐ NP s as well as Ca‐ NP s gels with multiple shapes of crystallites. Crystal shapes ranged from rounded/drop‐like or plate‐like crystals to needle‐like or polyhedral and cubic apatite appearance.
机译：摘要旨在调查结晶度和超微结构，当用四种不同的基于纳米凝块的溶液治疗宫颈牙本质时，用于再矿化目的。将基于聚合物纳米颗粒（NP S）和锌，钙或多屈霉素负载的NP S的方法实验纳米凝块施用于柠檬酸蚀刻牙本质，以促进小管的闭塞和牙本质表面的矿化。通过X射线衍射和透射电子显微镜通过选定的区域衍射和亮场显微镜研究牙本质表面。结果牙齿表面的晶​​体在用Zn-NP S基凝胶处理的牙本质中具有最高的晶体成熟度和微晶尺寸的羟基磷灰石。纹理在所有样品中增加了24？H至7？天，除了用Zn-NP S凝胶处理的牙本质表面。多面体，板状和滴状形状的磷灰石晶体构成用Zn-NPS凝胶处理的牙本质中的大部分矿物质，7？天。多晶型，立方和针状形状的晶体占矿物质，在施用Zn-NPS的时间后，用Ca-NP S凝胶处理的牙本质中具有更多无定形特征。 DOXYCYCLINE-NP S产生了具有差的结晶度，成熟度和化学稳定性的最小晶体。结论在用Zn-NP S的两种类型的牙本质中描述了新形成的羟基磷灰石的结晶和无定形阶段，以及具有多种微晶的Ca-NP S凝胶。晶体形状范围从圆形/滴或板状晶体到针状或多面体和立方磷灰石外观。

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