树脂基牙科材料粘弹性对树脂-牙本质剪切结合强度的影响。

IF 4.8 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of dentistry Pub Date : 2025-06-21 DOI:10.1016/j.jdent.2025.105926

Ying He , Cui-Ting Chen , Lin Li , Yan-Xia Zhou , Ke Zhao , Yan-Dong Mu , Xiao-Dong Wang

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引用次数: 0

摘要

目的：1)阐明牙本质和三种树脂基牙科材料的静态或动态粘弹性行为对树脂-牙本质界面剪切结合强度的影响。2)采用有限元方法研究树脂基牙本质材料粘弹性特性对树脂-牙本质界面残余应力的影响。方法：对3种树脂基牙本质粘结材料进行单调压缩、静态和动态体积压缩蠕变试验。然后评估剪切粘结强度、破坏模式和界面形态。此外，聚合收缩率(s)和杨氏模量(E)的材料分别采用浮力法和动态力学分析（DMA）。圆柱形试样进行静/动蠕变试验，收集应力-应变数据。最后，采用有限元法对树脂-牙本质界面残余应力分布进行了评估，并进行了蠕变试验。结果：1)与单调压缩相比，静态和动态蠕变均显著提高了树脂-牙本质结合强度（p < 0.05），且动态蠕变优于单调压缩；2)单调压缩主要导致黏结破坏和黏结破坏的混合，而体压缩蠕变试验减少了黏结破坏，增加了黏结破坏。(3)单调压缩导致牙本质小管出现更多的空心现象，树脂标签被拉出，而整体压缩蠕变试验显示小管内存在树脂标签，树脂与牙本质之间存在裂缝。4)有限元分析表明，应力集中在粘接区域边缘，树脂粘接层的应力最大。经过体压缩蠕变试验，应力分布更加均匀，残余应力降低50%以上。结论：体压缩蠕变通过促进界面应力松弛提高树脂-牙本质结合强度。树脂基牙科材料的粘弹性行为减轻了聚合收缩应力，使树脂-牙本质界面的应力有效松弛。临床意义：在直接修复过程中，具有适当粘弹性的树脂基牙科材料可有效降低聚合收缩应力。这反过来又促进了树脂-牙本质界面的有效应力松弛，提高了粘接性能。

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The effect of viscoelastic behavior of resin-based dental materials on the resin-dentin shear bond strength

Objectives

1) To clarify the effect of static or dynamic viscoelastic behavior of dentin and three resin-based dental materials on resin-dentin interfacial shear bond strength. 2) To investigate the influence of resin-based dental materials' viscoelastic behavior on residual stress at resin-dentin interface using finite element analysis (FEA).

Methods

Resin-dentin bonded specimens of three resin-based dental materials underwent monotonic compression, static and dynamic bulk compressive creep tests. Then shear bond strength, failure modes, and interface morphology were assessed. Additionally, polymerization shrinkage (s) and Young’s modulus (E) for the materials were determined using buoyancy method and dynamic mechanical analysis (DMA), respectively. Cylindrical specimens underwent static/dynamic creep tests to collect stress-strain data. Finally, FEA was employed to assess the residual stress distribution at resin-dentin interface with/without creep tests.

Results

1) Compared to monotonic compression, both static and dynamic creep significantly increased resin-dentin bond strength (p < 0.05), with dynamic creep superior. 2) Monotonic compression primarily caused mixed adhesive and cohesive failures, while bulk compressive creep tests reduced adhesive failure and increased cohesive failure. 3) Monotonic compression caused more hollow dentin tubules and pulled-out resin tags, whereas bulk compressive creep tests revealed resin tags inside tubules and cracks between resin and dentin. 4) FEA indicated stress concentration at margins of the bonded area, with the resin adhesive layer experiencing the highest stress. After bulk compressive creep tests, stress distribution became more uniform, and residual stress decreased by 50 % or more.

Conclusions

Bulk compressive creep improves resin-dentin bond strength by facilitating interfacial stress relaxation. The resin-based dental materials' viscoelastic behavior mitigates polymerization shrinkage stress, enabling effective stress relaxation at resin-dentin interface.

Clinical Significance

During direct restoration process, resin-based dental materials with appropriate viscoelastic properties can effectively reduce polymerization shrinkage stress. This, in turn, promotes efficient stress relaxation at the resin-dentin interface and enhances bonding performance.

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来源期刊

Journal of dentistry 医学-牙科与口腔外科

CiteScore

7.30

自引率

11.40%

发文量

349

审稿时长

35 days

期刊介绍： The Journal of Dentistry has an open access mirror journal The Journal of Dentistry: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The Journal of Dentistry is the leading international dental journal within the field of Restorative Dentistry. Placing an emphasis on publishing novel and high-quality research papers, the Journal aims to influence the practice of dentistry at clinician, research, industry and policy-maker level on an international basis. Topics covered include the management of dental disease, periodontology, endodontology, operative dentistry, fixed and removable prosthodontics, dental biomaterials science, long-term clinical trials including epidemiology and oral health, technology transfer of new scientific instrumentation or procedures, as well as clinically relevant oral biology and translational research. The Journal of Dentistry will publish original scientific research papers including short communications. It is also interested in publishing review articles and leaders in themed areas which will be linked to new scientific research. Conference proceedings are also welcome and expressions of interest should be communicated to the Editor.