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首页> 外文期刊>Journal of dentistry >Radiopaque dental adhesives: Dispersion of flame-made Ta(2)O(5)/SiO(2) nanoparticles in methacrylic matrices.
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Radiopaque dental adhesives: Dispersion of flame-made Ta(2)O(5)/SiO(2) nanoparticles in methacrylic matrices.

机译：不透射线的牙科粘合剂：在甲基丙烯酸基体中分散有火焰制成的Ta（2）O（5）/ SiO（2）纳米粒子。

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OBJECTIVES: Radiopaque dental adhesive (DA) of low viscosity were made by forming stable suspensions of weakly agglomerated Ta(2)O(5)/SiO(2) nanoparticles with primary particle size of about 10nm. METHODS: The particles were prepared by one-step flame-spray pyrolysis. Particles were functionalized with gamma-methacryloxypropyltrimethoxysilane (MPS) and dispersed in a methacrylic monomer matrix by centrifugal mixing and ultrasonication. Particle size distributions were analyzed by X-ray disc centrifugation of suspensions and TEM analysis of cured sample composites, while average primary particle size was obtained by N(2) adsorption and X-ray diffraction. RESULTS: The dispersion method affected the aggregate size distribution of both untreated and surface functionalized particles in these suspensions. The influence of particle content on suspension viscosity, aggregate size distribution and that of Ta(2)O(5) content on radiopacity was investigated. The shear bond strength of such radiopaque particle-containing adhesives on enamel and dentin was comparable to that of the particle-free reference adhesive. CONCLUSIONS: Flame-made Ta(2)O(5)/SiO(2) nanoparticles can be introduced readily into dental adhesives as they form quite stable suspensions. Viscosity stayed low even after adding radiopaque particles up to 20wt.%. The resulting composites had radiopacity comparable to that of enamel facilitating their distinction from marginal gaps. Bond strength was not significantly influenced by the presence of particles in the adhesive.
机译：目的：低粘度的不透射线的牙科粘合剂（DA）是通过形成稳定的悬浮液形成的，该悬浮液具有约10nm的一次粒径的Ta（2）O（5）/ SiO（2）纳米颗粒。方法：采用一步火焰喷雾热解法制备颗粒。将颗粒用γ-甲基丙烯酰氧基丙基三甲氧基硅烷（MPS）功能化，并通过离心混合和超声处理分散在甲基丙烯酸单体基质中。通过悬浮液的X射线圆盘离心和固化样品复合材料的TEM分析来分析粒度分布，而通过N（2）吸附和X射线衍射获得平均一次粒径。结果：分散法影响了这些悬浮液中未处理颗粒和表面官能化颗粒的总粒径分布。研究了颗粒含量对悬浮粘度，聚集体粒度分布以及Ta（2）O（5）含量对射线不透性的影响。这种含不透射线的颗粒粘合剂在牙釉质和牙本质上的剪切粘结强度与无颗粒的参考粘合剂相当。结论：火焰制造的Ta（2）O（5）/ SiO（2）纳米粒子可以很容易地引入牙科粘合剂中，因为它们形成了相当稳定的悬浮液。即使加入不透射线的颗粒至多20wt。％，粘度也保持较低。所得复合材料的射线不透性与搪瓷相当，从而有助于区别于边缘间隙。粘合剂中颗粒的存在对粘结强度没有显着影响。

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