Kim Hye Jeong, Kwon Jiyoung, Kim Hyun-Jung, Kim Reuben H, Kim Duck-Su, Jang Ji-Hyun
Department of Conservative Dentistry, Graduate School, Kyung Hee University, Seoul, Korea.
Department of Conservative Dentistry, School of Dentistry, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul, 02447, Korea.
BMC Oral Health. 2025 Jul 1;25(1):972. doi: 10.1186/s12903-025-06353-z.
This study aimed to investigate the polymerization shrinkage, microhardness, DOC, and compressive strength of composite resin materials employed for core restoration, encompassing dual-cured core resin composites and LC bulk-fill composites.
Bulk-fill resin composites [Filtek One Bulk fill (BFO), Bulk Fill Base (BBB), Metafil Bulkfill One (BMF)] and dual-cured core resin composites (Luxacore Z, Any-Core) served as the experimental group, while two conventional LC resin composites [Filtek Z350 (FTZ), metafil flo (FMF)] served as the control group. Two dual-cured core resin composites were named as follows, CLD, CLS (Luxacore Z, in dual-cured mode and self-cured (SC) mode); CAD and CAS (Any-Core, in dual-cured mode and SC mode). Linear polymerization shrinkage, depth of cure (DOC) using microhardness, and compressive strength were evaluated for each experimental group. The results were analyzed using one-way ANOVA, and a post-hoc test (Duncan's test) was performed at a 95% confidence level.
The linear polymerization shrinkage rate was higher in the dual-pol9ymerization core resin group than in the control group FTZ and bulk-fill resin groups, and in each dual-cured core resin, the dual-cured group was higher than the SC group. The DOC was higher in the bulk-fill resin group than in the control group, and the DOC of the dual-cured core resin group showed a significant variation depending on the product. The compressive strength of the bulk-fill resin group showed a significant variation depending on the product. The compressive strength in the bulk-fill resin group was higher as the filler content increased in the dual-cured mode than the SC mode in the dual-cured core resin group.
Bulk-fill resins showed superior polymerization shrinkage and DOC compared to conventional resin composites and dual-cured core resins. At 4 mm depth, Bulk-fill resin composites achieved an appropriate DOC, but for dual-cured core resins, the DOC varied depending on the product.
Highly filled bulk-fill resins could be a predictable restorative material for deep cavities and post-endodontic core material, considering its polymerization shrinkage, DOC, and mechanical properties.
本研究旨在调查用于核修复的复合树脂材料的聚合收缩率、显微硬度、固化深度（DOC）和抗压强度，包括双固化核树脂复合材料和低收缩（LC）大体积充填复合材料。
大体积充填树脂复合材料[Filtek One Bulk fill（BFO）、Bulk Fill Base（BBB）、Metafil Bulkfill One（BMF）]和双固化核树脂复合材料（Luxacore Z、Any-Core）作为实验组，而两种传统的LC树脂复合材料[Filtek Z350（FTZ）、metafil flo（FMF）]作为对照组。两种双固化核树脂复合材料命名如下，CLD、CLS（Luxacore Z，双固化模式和自固化（SC）模式）；CAD和CAS（Any-Core，双固化模式和SC模式）。对每个实验组评估线性聚合收缩率、使用显微硬度的固化深度（DOC）和抗压强度。结果采用单因素方差分析进行分析，并在95%置信水平下进行事后检验（邓肯检验）。
双固化核树脂组的线性聚合收缩率高于对照组FTZ和大体积充填树脂组，并且在每种双固化核树脂中，双固化组高于SC组。大体积充填树脂组的DOC高于对照组，双固化核树脂组的DOC根据产品显示出显著差异。大体积充填树脂组的抗压强度根据产品显示出显著差异。在双固化模式下，随着双固化核树脂组中填料含量的增加，大体积充填树脂组的抗压强度高于SC模式。
与传统树脂复合材料和双固化核树脂相比，大体积充填树脂显示出优异的聚合收缩率和DOC。在4毫米深度时，大体积充填树脂复合材料实现了合适的DOC，但对于双固化核树脂，DOC因产品而异。
考虑到大体积充填树脂的聚合收缩率、DOC和机械性能，高填料含量的大体积充填树脂可能是用于深龋洞修复和根管治疗后核材料的可预测修复材料。
