Characterization of dental composites by thermal analysis, infrared spectroscopy and scanning electron microscopy
Characterization of dental composites by thermal analysis, infrared spectroscopy and scanning electron microscopy
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通过热分析、红外光谱和扫描电子显微镜表征牙科复合材料
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
C. Mothé
中科院分区：
文献类型：
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作者：
C. Almeida;C. Mothé
本研究采用了商用光固化牙科复合材料。两种实验室复合材料Resilab （Wilcos/巴西）和Epricord （Kuraray/日本）在固化和未固化条件下进行了比较。采用热分析、红外光谱和扫描电镜对复合材料进行评价。采用STA 409 PC Luxx （NETZSCH）仪器，在25-800℃温度范围内，在氮气气氛（70 mL/min）下，加热速率为10℃/min，同时记录质量变化和热流信号（TG-DSC）。采用热微天平TG 209 C F1虹膜（NETZSCH）与布鲁克光学FTIR张量仪（BRUKER Optics FTIR张量仪）结合热重和光谱法（TG - FTIR）分析样品。初始样品质量约为~12 mg，数据采集在35 ~ 800℃温度范围内，在氮气气氛中加热速率为20 K/min（流速为40 mL/min）。最后，通过扫描电子显微镜（SEM）对表面形貌进行分析。牙科复合材料评价表明RES D样品具有较高的热稳定性和无机含量。转化度（DC）值几乎相同，DC与颗粒数量和粒径之间没有直接关系。在所有样品中都发现了相似的成分。
Commercial light-cured dental composites were used in this study. Two laboratorial composites, Resilab (Wilcos/Brazil), Epricord (Kuraray/Japan) were compared under cured and uncured conditions. Thermal analysis, infrared spectroscopy and scanning electron microscopy were used to evaluate the dental composites. The mass change and heat flow signals (TG–DSC) were recorded simultaneously by using STA 409 PC Luxx (NETZSCH), in the 25–800 °C temperature range at a heating rate of 10 °C/min under nitrogen atmosphere (70 mL/min). Employing thermo-microbalance TG 209 C F1 Iris (NETZSCH) coupled to the BRUKER Optics FTIR TENSOR, the samples were analyzed by combined thermogravimetric and spectroscopic methods (TG–FTIR). The initial sample mass was about ~12 mg, the data collection have been done in the 35–800 °C temperature range at a heating rate of 20 K/min in nitrogen atmosphere (flow rate: 40 mL/min). Finally, superficial topographic was analyzed by scanning electron microscopy (SEM). Dental composite evaluation suggests a high thermal stability and inorganic content in RES D sample. Degrees of conversion (DC) values were almost the same and there was no direct relationship between DC and amount of particles and size. Similar compositions were found in all samples.