两种大块充填可流动复合树脂固化深度和转化率的比较评估
Comparative Evaluation of the Depth of Cure and Degree of Conversion of Two Bulk Fill Flowable Composites.
作者信息
Yokesh Ca Anand, Hemalatha P, Muthalagu M, Justin M Robert
机构信息
Postgraduate Student, Department of Conservative Dentistry and Endodontics, Best Dental Science College, Dindigul, Tamil Nadu, India.
Professor and Head, Department of Conservative Dentistry and Endodontics, Best Dental Science College, Madurai, Tamil Nadu, India.
出版信息
J Clin Diagn Res. 2017 Aug;11(8):ZC86-ZC89. doi: 10.7860/JCDR/2017/28004.10444. Epub 2017 Aug 1.
INTRODUCTION
Since the development of resin based composites, several improvements have been made to improve their physical and chemical properties. In an attempt to fasten and simplify the restoration process, a new class of resin based composite materials, called the bulk fill resin based composites have been introduced, which has been claimed to achieve a depth of cure of 4 mm without affecting the properties of the material.
AIM
To comparatively evaluate the depth of cure of two different bulk fill flowable composite resins by ISO 4049 method and to evaluate the degree of conversion of the same composite resins with Fourier Transform Infrared (FTIR) spectroscopy method.
MATERIALS AND METHODS
Composite resin specimens (n=10) per group were prepared with bulk fill flowable composites, Surefil SDR flow (Dentsply Caulk, Milford, DE, USA) designated as Group A and Filtek bulk fill (3M ESPE, St.Paul, MN, USA) designated as Group B. Depth of cure was determined according to "ISO 4049; Depth of Cure" method, and FTIR spectroscopy method was used to estimate the degree of conversion of both the bulk fill flowable composites. The degree of conversion of monomer to polymer was estimated individually in coronal half (Group A1 and B1) and pulpal half (Group A2 and Group B2) by dividing each specimens into two halves. The data were analysed using Student's unpaired t-test at 5% level of significance.
RESULTS
The mean depth of cure of Group A was 3.89 mm (±0.103) and for Group B was 3.54 mm (±0.129). The degree of conversion percentage for Group A1=78.51 (±47.8), Group A2= 31.9 (±22.4), Group B1=39.8 (±5.2), Group B2=37.4 (±6.4). Statistical analysis revealed significant difference in the depth of cure between the two bulk fill flowable composites with Group A higher than Group B. The degree of conversion of the coronal half of Group A1 was significantly higher when compared to Group B1.
CONCLUSION
Surefil SDR bulk fill resin has better depth of cure and degree of conversion compared to Filtek bulk fill composites.
引言
自从基于树脂的复合材料发展以来，人们已经做出了多项改进以提升其物理和化学性能。为了加快并简化修复过程，一类新型的基于树脂的复合材料——大块充填型基于树脂的复合材料被引入，据称这种材料能实现4毫米的固化深度且不影响材料性能。
目的
通过ISO 4049方法比较评估两种不同的大块充填可流动复合树脂的固化深度，并使用傅里叶变换红外光谱（FTIR）法评估相同复合树脂的转化率。
材料与方法
每组制备10个复合树脂样本，使用大块充填可流动复合材料，Surefil SDR flow（美国特拉华州米尔福德登士柏卡ulk公司）指定为A组，Filtek大块充填（美国明尼苏达州圣保罗3M ESPE公司）指定为B组。根据“ISO 4049；固化深度”方法确定固化深度，并使用FTIR光谱法评估两种大块充填可流动复合材料的转化率。通过将每个样本分成两半，分别在冠部半层（A1组和B1组）和髓腔半层（A2组和B2组）单独评估单体向聚合物的转化率。数据采用Student非配对t检验在5%显著性水平下进行分析。
结果
A组的平均固化深度为3.89毫米（±0.103），B组为3.54毫米（±0.129）。A1组的转化率百分比为78.51（±47.8），A2组为31.9（±22.4），B1组为39.8（±5.2），B2组为37.4（±6.4）。统计分析显示，两种大块充填可流动复合材料之间的固化深度存在显著差异，A组高于B组。A1组冠部半层的转化率与B1组相比显著更高。
结论
与Filtek大块充填复合材料相比，Surefil SDR大块充填树脂具有更好的固化深度和转化率。
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