Flowable composite as an alternative to adhesive resin cement in bonding hybrid CAD/CAM materials: in-vitro study of micro-shear bond strength.

IF 2.5 Q2 DENTISTRY, ORAL SURGERY & MEDICINE

BDJ Open Pub Date : 2024-08-20 DOI:10.1038/s41405-024-00251-2

Eman Ezzat Youssef Hassanien, Zeinab Omar Tolba

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Abstract

Objective: To assess the micro-shear bond strength of light-cured adhesive resin cement compared to flowable composite to hybrid CAD/CAM ceramics.

Materials and methods: Rectangular discs were obtained from polymer-infiltrated (Vita Enamic; VE) and nano-hybrid resin-matrix (Voco Grandio; GR) ceramic blocks and randomly divided according to the luting agent; light-cured resin cement (Calibra Veneer; C) and flowable composite (Neo Spectra ST flow; F), resulting in four subgroups; VE-C, VE-F, GR-C and GR-F. Substrates received micro-cylinders of the tested luting agents (n = 16). After water storage, specimens were tested for micro-shear bond strength (µSBS) using a universal testing machine at 0.5 mm/min cross-head speed until failure and failure modes were determined. After testing for normality, quantitative data were expressed as mean and standard deviation, whereas, qualitative data were expressed as percentages. Quantitative data were statistically analysed using Student t test at a level of significance (P ≤ 0.05).

Results: Group GR-F showed the highest µSBS, followed by VE-C, VE-F and GR-C respectively, although statistically insignificant. All groups showed mixed and adhesive failure modes, where VE-F and GR-C showed the highest mixed failures followed by GR-C and VE-C respectively.

Conclusions: After short-term aging, flowable composite and light-cured resin cement showed high comparable bond strength when cementing VE and GR.

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在粘接 CAD/CAM 混合材料时，可流动复合材料可替代粘接树脂水泥：微剪切粘接强度的体外研究。

目的评估光固化粘接树脂水泥与流动复合材料对混合 CAD/CAM 陶瓷的微剪切粘接强度：从聚合物浸润（Vita Enamic；VE）和纳米混合树脂基质（Voco Grandio；GR）陶瓷块中获得矩形盘，并根据粘结剂（光固化树脂粘结剂（Calibra Veneer；C）和可流动复合材料（Neo Spectra ST flow；F））随机分为四组：VE-C、VE-F、GR-C 和 GR-F。基底接受了测试的胶合剂微圆柱体（n = 16）。贮水后，使用万能试验机以 0.5 毫米/分钟的十字头速度对试样进行微剪切粘接强度（µSBS）测试，直至确定失效和失效模式。经过正态性测试后，定量数据以平均值和标准偏差表示，而定性数据则以百分比表示。定量数据采用学生 t 检验进行统计分析，显著性水平为 P ≤ 0.05：结果：GR-F 组的 µSBS 值最高，其次分别是 VE-C、VE-F 和 GR-C，但统计意义不大。所有组都显示出混合和粘合失效模式，其中 VE-F 和 GR-C 显示出最高的混合失效，其次分别是 GR-C 和 VE-C：结论：短期老化后，可流动复合材料和光固化树脂粘接剂在粘接 VE 和 GR 时显示出很高的可比粘接强度。

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