Oltramare Ramona S, Odermatt Reto, Burrer Phoebe, Attin Thomas, Tauböck Tobias T
Clinic of Conservative and Preventive Dentistry, Center for Dental Medicine, University of Zurich, 8032 Zurich, Switzerland.
Department of Pediatric Oral Health and Orthodontics, University Center for Dental Medicine Basel UZB, University of Basel, 4058 Basel, Switzerland.
Materials (Basel). 2021 Nov 9;14(22):6753. doi: 10.3390/ma14226753.
The aim of this in vitro study was to investigate the degree of C=C double bond conversion of high-viscosity dimethacrylate- or ormocer-based bulk-fill composites as a function of measurement depth. Four bulk-fill composites (Tetric EvoCeram Bulk Fill, x-tra fil, SonicFill, and Bulk Ormocer) and the conventional nanohybrid composite Tetric EvoCeram were applied in standardized Class II cavities ( = 6 per group) and photoactivated for 20 s at 1350 mW/cm. The degree of conversion of the composites was assessed using Fourier-transform infrared spectroscopy at seven measurement depths (0.15, 1, 2, 3, 4, 5, 6 mm). Data were analyzed using repeated measures ANOVA and one-way ANOVA with Bonferroni post-hoc tests (α = 0.05). The investigated bulk-fill composites showed at least 80% of their maximum degree of conversion (80% DC) up to a measuring depth of at least 4 mm. Tetric EvoCeram Bulk Fill and Bulk Ormocer achieved more than 80% DC up to a measuring depth of 5 mm, x-tra fil up to 6 mm. The conventional nanohybrid composite Tetric EvoCeram achieved more than 80% DC up to 3 mm. In contrast to the conventional composite, the investigated ormocer- and dimethacrylate-based bulk-fill composites can be photo-polymerized in thick layers of up to at least 4 mm with regard to their degree of C=C double bond conversion.
本体外研究的目的是研究高粘度二甲基丙烯酸酯基或有机陶瓷基大块充填复合材料中C=C双键转化率随测量深度的变化情况。将四种大块充填复合材料（Tetric EvoCeram Bulk Fill、x-tra fil、SonicFill和Bulk Ormocer）以及传统纳米混合复合材料Tetric EvoCeram应用于标准化的II类洞型（每组n = 6），并在1350 mW/cm的条件下光固化20秒。使用傅里叶变换红外光谱法在七个测量深度（0.15、1、2、3、4、5、6 mm）评估复合材料的转化率。数据采用重复测量方差分析和单因素方差分析，并进行Bonferroni事后检验（α = 0.05）。所研究的大块充填复合材料在至少4 mm的测量深度内显示出至少80%的最大转化率（80% DC）。Tetric EvoCeram Bulk Fill和Bulk Ormocer在5 mm的测量深度内达到了超过80% DC，x-tra fil在6 mm内达到了该水平。传统纳米混合复合材料Tetric EvoCeram在3 mm内达到了超过80% DC。与传统复合材料相比，就C=C双键转化率而言，所研究的基于有机陶瓷和二甲基丙烯酸酯的大块充填复合材料可以在至少4 mm的厚层中进行光聚合。
