Patnana Arun Kumar, Vanga V Narsimha Rao, Chandrabhatla Srinivas Kumar
Resident Doctor, Department of Dentistry, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India.
Professor, Department of Pedodontics and Preventive Dentistry, GITAM Dental College and Hospital, Visakhapatnam, Andhra Pradesh, India.
J Clin Diagn Res. 2017 Jun;11(6):ZC24-ZC27. doi: 10.7860/JCDR/2017/27835.10049. Epub 2017 Jun 1.
Over the past years, composites in aesthetic dentistry are showing a considerable progress, but mechanical strength and polymerization shrinkage are the two main drawbacks, which limit their use in high stress bearing areas.
To evaluate the marginal integrity of short glass fibre reinforced composite restorations, fibre reinforced composites with composite superficial layer, and fibre reinforced composites with underlying flowable composite layer.
This study was done on twenty eight sound premolar teeth with standardized class V cavities restored under four groups as Group I: Particulate filler composite (Filtek Z 250 XT, 3M ESPE); Group II: Short glass fibre reinforced composite (everX Posterior, GC); Group III: Short glass fibre reinforced composite with an overlying layer of particulate filler composite; Group IV: Short glass fibre reinforced composite with an underlying layer of flowable composite (Filtek Z 250 XT, 3M ESPE). Test samples were immersed in a 2% methylene blue dye for 24 hours at 37°C and each tooth was sectioned bucco-lingually. Staining along the tooth restoration interface was recorded and results were analysed statistically using Independent sample t-test and Tukey's post-hoc one-way ANOVA.
The results showed significant difference in the dye penetration between the restorative materials in the occlusal and gingival margins (p=0.02). Short fibre reinforced composites showed a statistically significant difference in the microleakage scores when compared with the particulate filler composites (p=0.01).
Short glass fibre reinforced composite restorations showed an improved marginal integrity when compared to the traditional particulate filler composite restorations.
在过去几年中，口腔美学领域的复合材料取得了显著进展，但机械强度和聚合收缩是两个主要缺点，这限制了它们在高应力承载区域的应用。
评估短玻璃纤维增强复合树脂修复体、带有复合表层的纤维增强复合材料以及带有底层可流动复合层的纤维增强复合材料的边缘完整性。
本研究选取28颗健康的前磨牙，制备标准化的V类洞，并分为四组进行修复：第一组：颗粒填料复合树脂（Filtek Z 250 XT，3M ESPE）；第二组：短玻璃纤维增强复合树脂（everX Posterior，GC）；第三组：短玻璃纤维增强复合树脂并覆盖一层颗粒填料复合树脂；第四组：短玻璃纤维增强复合树脂并在底层使用可流动复合树脂（Filtek Z 250 XT，3M ESPE）。将测试样本在37°C下浸泡于2%的亚甲蓝染料中24小时，然后将每颗牙齿沿颊舌向切片。记录牙齿修复界面的染色情况，并使用独立样本t检验和Tukey事后单因素方差分析对结果进行统计学分析。
结果显示，修复材料在咬合边缘和牙龈边缘的染料渗透存在显著差异（p = 0.02）。与颗粒填料复合树脂相比，短纤维增强复合树脂在微渗漏评分上有统计学显著差异（p = 0.01）。
与传统的颗粒填料复合树脂修复体相比，短玻璃纤维增强复合树脂修复体的边缘完整性得到了改善。
