纤维增强树脂改性玻璃离子水门汀。

Fiber reinforcement of a resin modified glass ionomer cement.

机构信息

School of Mechanical and Manufacturing Engineering, University of New South Wales (UNSW Sydney), Sydney NSW 2052, Australia.

School of Dentistry, The University of Sydney, Westmead NSW 2145, Australia.

出版信息

Dent Mater. 2020 Dec;36(12):1516-1523. doi: 10.1016/j.dental.2020.09.003. Epub 2020 Oct 1.

DOI:10.1016/j.dental.2020.09.003

PMID:33010942

Abstract

OBJECTIVES

Understand how discontinuous short glass fibers and braided long fibers can be effectively used to reinforce a resin modified glass ionomer cement (RMGIC) for carious lesion restorations.

METHODS

Two control groups (powder/liquid kit and capsule) were prepared from a light cured RMGIC. Either discontinuous short glass fibers or braided polyethylene fiber ribbons were used as a reinforcement both with and without pre-impregnation with resin. For the former case, the matrix was the powder/liquid kit RMGIC, and for the latter case the matrix was the capsule form. Flexural strength was evaluated by three-point beam bending and fracture toughness was evaluated by the single-edge V-notch beam method. Compressive strength tests were performed on cylindrical samples. Results were compared by analysis of variances and Tukey's post-hoc test. Flexural strength data were analyzed using Weibull statistical analysis.

RESULTS

The short fiber reinforced RMGIC both with and without pre-impregnation showed a significant increase of ∼50% in the mean flexural strength and 160-220% higher fracture toughness compared with the powder/liquid RMGIC control. Reinforcement with continuous braided fibers gave more than a 150% increase in flexural strength, and pre-impregnation of the braided fibers with resin resulted in a significant flexural strength increase of more than 300% relative to the capsule control. However, for the short fiber reinforced RMGIC there was no significant benefit of resin pre-impregnation of the fibers. The Weibull modulus for the flexural strength approximately doubled for the fiber reinforced groups compared to the control groups. Finally, compressive strength was similar for all the groups tested.

SIGNIFICANCE

By using a RMGIC as a matrix, higher flexural strength was achieved compared to reported values for short fiber reinforced GICs. Additionally, the short fibers provided effective toughening of the RMGIC matrix by a fiber bridging mechanism. Finally, continuous braided polyethylene fibers gave much higher flexural strength than discontinuous glass fibers, and their effectiveness was enhanced by pre-impregnation of the fibers with resin.

摘要

目的

了解如何将不连续的短玻璃纤维和编织的长纤维有效地用于增强树脂改性玻璃离子水门汀（RMGIC），以用于龋齿病变修复。

方法

从光固化 RMGIC 中制备了两个对照组（粉末/液体试剂盒和胶囊）。将不连续的短玻璃纤维或编织的聚乙烯纤维带用作增强材料，同时进行和不进行树脂预浸渍。在前一种情况下，基质是粉末/液体试剂盒 RMGIC，在后一种情况下，基质是胶囊形式。通过三点梁弯曲法评估弯曲强度，通过单边 V 型缺口梁法评估断裂韧性。对圆柱形样品进行抗压强度测试。通过方差分析和 Tukey 事后检验比较结果。使用威布尔统计分析对弯曲强度数据进行分析。

结果

未预浸渍和预浸渍的短纤维增强 RMGIC 的平均弯曲强度分别提高了约 50%，断裂韧性提高了 160-220%，与粉末/液体 RMGIC 对照组相比。连续编织纤维的增强使弯曲强度提高了 150%以上，并且编织纤维用树脂进行预浸渍使相对胶囊对照组的弯曲强度显著提高了 300%以上。然而，对于短纤维增强的 RMGIC，纤维的树脂预浸渍并没有显著提高弯曲强度。与对照组相比，纤维增强组的弯曲强度威布尔模数大约增加了一倍。最后，所有测试组的抗压强度相似。