Department of Conservative and Preventive Dentistry, Center for Dental Medicine, University of Zurich.
Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich.
Dent Mater J. 2021 Jan 31;40(1):110-115. doi: 10.4012/dmj.2019-382. Epub 2020 Aug 28.
This study investigated the effect of adding bioactive glass 45S5 (BG) of different particle sizes to dental composite on resin polymerization and shrinkage stress formation. Commercial flowable composite was mixed with either 15 wt% BG fillers (nanometric, micrometric, or hybrid BG) or inert barium glass. Real-time linear polymerization shrinkage and shrinkage stress were recorded, and the degree of conversion was measured using FTIR spectroscopy. The commercial (unmodified) composite developed significantly higher linear shrinkage and shrinkage stress than the groups with 15 wt% added inert or BG fillers. After adding inert barium glass, the composite showed significantly higher linear shrinkage than when micrometric BG was added. The addition of bioactive or inert glass fillers did not affect the degree of conversion. Shrinkage stress can be reduced by adding inert or bioactive fillers (nano- and/or microparticulate BG) without affecting monomer conversion.
本研究探讨了向牙科复合材料中添加不同粒径的生物活性玻璃 45S5（BG）对树脂聚合和收缩应力形成的影响。将商业可流动复合材料与 15wt%的 BG 填料（纳米级、微米级或混合 BG）或惰性钡玻璃混合。实时记录线性聚合收缩和收缩应力，并使用傅里叶变换红外光谱法测量转化率。商用（未改性）复合材料的线性收缩和收缩应力明显高于添加惰性或 BG 填料的组。添加惰性钡玻璃后，复合材料的线性收缩率明显高于添加微米级 BG 的组。添加生物活性或惰性玻璃填料不会影响转化率。通过添加惰性或生物活性填料（纳米和/或微米级 BG）可以减少收缩应力，而不会影响单体转化率。
