Lassila Lippo, Haapsaari Anssi, Vallittu Pekka K, Garoushi Sufyan
Turku Clinical Biomaterial Center-TCBC, Department of Biomaterials Science, Institute of Dentistry, University of Turku, 20500 Turku, Finland.
City of Turku Welfare Division, Oral Health Care, 20500 Turku, Finland.
Polymers (Basel). 2022 Apr 28;14(9):1809. doi: 10.3390/polym14091809.
The aim of this study was to investigate the load-bearing capacity of anterior crowns made of different commercial particulate-filled composites (PFCs) and reinforced by a core of short-fiber composite (SFC) (bilayer structure). Four groups of composite crowns were fabricated for an upper central incisor (n = 20/group). Two groups were made of chair-side PFC composites (G-aenial anterior, GC, Japan and Denfil, Vericom, Korea) with or without SFC-core (everX Flow, GC). One group was made of laboratory PFC composite (Gradia Plus, GC) with or without SFC-core. The last group was made of plain SFC composite polymerized with a hand-light curing unit only or further polymerized in a light-curing oven. Using a universal-testing device, crown restorations were statically loaded until they fractured, and failure modes were visually investigated. Analysis of variance (p = 0.05) was used to evaluate the data, followed by Tukey’s post hoc test. Bilayer structure crowns with SFC-core and surface PFC gave superior load-bearing capacity values compared to those made of monolayer PFC composites; however, significant differences (p < 0.05) were found in the chair-side composite groups. Additional polymerization has no impact on the load-bearing capacity values of SFC crowns. Using SFC as a core material with PFC veneering composite to strengthen anterior crown restorations proved to be a promising strategy for further testing.
本研究的目的是调查由不同市售颗粒填充复合材料（PFC）制成并由短纤维复合材料（SFC）芯增强（双层结构）的前牙冠的承载能力。为上颌中切牙制作了四组复合冠（每组n = 20）。两组由椅旁PFC复合材料制成（G-aenial anterior，GC，日本；Denfil，Vericom，韩国），有无SFC芯（everX Flow，GC）。一组由实验室PFC复合材料（Gradia Plus，GC）制成，有无SFC芯。最后一组由仅用手持式光固化单元聚合或在光固化炉中进一步聚合的普通SFC复合材料制成。使用万能测试装置对冠修复体进行静态加载直至其断裂，并对失效模式进行视觉观察。采用方差分析（p = 0.05）评估数据，随后进行Tukey事后检验。与单层PFC复合材料制成的冠相比，带有SFC芯和表面PFC的双层结构冠具有更高的承载能力值；然而，在椅旁复合材料组中发现了显著差异（p < 0.05）。额外聚合对SFC冠的承载能力值没有影响。使用SFC作为芯材并结合PFC贴面复合材料来加强前牙冠修复体被证明是一种有前景的策略，有待进一步测试。
