Zirconia nanoparticles prepared by laser vaporization as fillers for dental adhesives
Zirconia nanoparticles prepared by laser vaporization as fillers for dental adhesives
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DOI：
10.1016/j.actbio.2010.07.002
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发表时间：
2010-12-01
影响因子：
9.7
通讯作者：
Mueller, Frank A.
中科院分区：
文献类型：
--
作者：
Lohbauer, Ulrich;Wagner, Andrea;Mueller, Frank A.
通过激光汽化制备的氧化锆纳米颗粒被掺入到底漆或商业粘合剂系统的粘合剂中，以评估其对牙本质粘结强度的影响。使用特定的激光蒸发技术制备氧化锆纳米颗粒（20-50 nm），并将其以5、10、15和20重量%掺入Adper Scotchbond Multi-Purpose（SBMP）体系的底漆（P）或粘合剂（A）中通过机械混合（搅拌）和超声处理。根据制造商的说明书，将对照组（未填充）和实验组（填充）施加到平坦的中冠状人类牙本质上。构建复合牙冠，在37 ℃的蒸馏水中储存24小时，并在非修剪微拉伸技术后切割成0.65 +/- 0.05 mm（2）的梁。使用万能试验机（Zwick）拉伸试样断裂，并通过扫描电子显微镜进行断口分析。在α = 0.05时，使用双因素ANOVA和改良的LSD检验分析微拉伸粘结强度（mu TBS）数据。通过透射电子显微镜（TEM）分析纳米填料的分布和界面的超形态特征。将氧化锆纳米颗粒掺入到SBMP的底漆或粘合剂中显着增加了牙本质的μ TBS。填料浓度仅对P组的mu TBS有显著影响。P组和A组之间的统计学显著差异仅在20重量%填料含量，在P组中具有显著更高的μ TBS。TEM显微照片显示当掺入底漆中时纳米颗粒沉积在混合层的顶部上，而在A组中它们保持分散在整个粘合剂层中。氧化锆纳米粒子掺入SBMP中，通过增强界面粘结层增加了与牙本质的粘结强度。掺入底漆溶液中的纳米填料表现出随着浓度增加而增加粘结强度的趋势。高浓度（20重量%）如果将纳米填料掺入底漆溶液中，则纳米填料的掺入在增加粘结强度方面更有效。将纳米填料添加到底漆和粘合剂溶液中导致界面处的不同颗粒分布。(C)2010 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Zirconia nanoparticles prepared by laser vaporization were incorporated into the primer or into the adhesive of a commercial adhesive system in order to evaluate its effect on bond strength to dentin. Zirconia nanoparticles (20-50 nm) were prepared using a particular laser vaporization technique and incorporated into the primer (P) or into the adhesive (A) of the Adper Scotchbond Multi-Purpose (SBMP) system at 5, 10, 15 and 20 wt.% by means of mechanical mixing (stirring) and ultrasonication. Control (unfilled) and experimental groups (filled) were applied, according to the manufacturer's instructions, onto flat mid-coronal human dentin. Composite crowns were built up, stored in distilled water for 24 h at 37 degrees C and cut into 0.65 +/- 0.05 mm(2) beams following a non-trimming microtensile technique. Specimens were fractured in tension using a universal testing machine (Zwick) and examined by scanning electron microscopy for fractographic analysis. Microtensile bond strength (mu TBS) data were analyzed using a two-way ANOVA and modified LSD test at alpha = 0.05. Analysis of the nanofiller distribution and ultramorphological characterization of the interface were performed by transmission electron microscopy (TEM). Zirconia nanoparticle incorporation into the primer or into the adhesive of SBMP significantly increased mu TBS to dentin. Filler concentration only affected mu TBS significantly in the P group. Statistically significant differences between groups P and A occurred only at 20 wt.% filler content, with a significantly higher mu TBS in group P. TEM micrographs revealed nanoparticle deposition on top of a hybrid layer when incorporated into the primer, whereas they remained dispersed through the adhesive layer in group A. Zirconia nanoparticles incorporation into SBMP increased bond strength to dentin by reinforcing the interface adhesive layer. Nanofiller incorporation into the primer solution showed a tendency of increasing bond strength with increasing concentration. At high concentrations (20 wt.%) nanofiller incorporation was more efficient in increasing bond strength if incorporated in the primer solution. Adding nanofillers to the primer and to the adhesive solutions resulted in different particle distributions at the interface. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.