This research investigated the effects of vibration on the rheological properties of dental composites and the adaptation of tooth cavity-composite interfaces. A portable vibratory packing device and two composites, micro-hybrid dental composite (MC) and nano-hybrid dental composite (NC), were evaluated. The frequency and amplitude of the vibratory packing device were measured. Dynamic oscillatory shear tests were conducted with varying frequency to examine the rheological properties of the composites. Twenty identical composite teeth with a Class I cavity were prepared and filled with one of the two composites. The composite was placed into a cavity using the vibratory packing device operating in either ON or OFF mode. After light-curing of the composite, the gap between the tooth and the composite was evaluated using micro-computed tomography. Two-way ANOVA was used to evaluate the effects of vibration and composite type on tooth-composite adaptation. The frequency of the vibratory packing device was 66.8 Hz. The complex viscosity, η*, of NC was higher than that of MC, and η* of both composites significantly decreased with increasing oscillation frequency. However, the application of vibration did not enhance adaptation at the tooth-composite interface.

中文翻译：

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振动对模拟牙腔中牙科复合材料适应性的影响

这项研究调查了振动对牙科复合材料的流变性能和牙腔-复合材料界面适应性的影响。评估了便携式振动包装设备和两种复合材料，即微混合牙科复合材料（MC）和纳米混合牙科复合材料（NC）。测量了振动包装装置的频率和振幅。动态振动剪切试验以不同的频率进行，以检查复合材料的流变性能。准备了20个具有I级腔的相同复合材料牙齿，并填充了两种复合材料之一。使用在ON或OFF模式下运行的振动包装装置将复合材料放入腔中。在光固化复合材料之后，使用微计算机断层摄影术评估牙齿和复合材料之间的间隙。双向方差分析用于评估振动和复合材料类型对牙齿复合材料适应性的影响。振动包装装置的频率为66.8Hz。复数粘度NC的η *高于MC的η * ，并且两种复合物的η *随着振荡频率的增加而显着降低。但是，振动的施加并没有增强牙齿-复合材料界面的适应性。