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不同市售自凝丙烯酸树脂的弯曲强度:一项体外研究。

Flexural Strength of Different Commercially Available Auto-Polymerizing Acrylic Resins: An In Vitro Study.

作者信息

Banerjee Soumalya, Jha Shruti, Singh Rupa, Shahi Harendra, Arya Aishwarya, Raj Rahul

机构信息

Prosthodontics, Crown and Bridge, Mithila Minority Dental College and Hospital, Darbhanga, IND.

Prosthodontics, Crown and Bridge, Banerjee Dental Clinic, Bihar, IND.

出版信息

Cureus. 2024 Oct 20;16(10):e71905. doi: 10.7759/cureus.71905. eCollection 2024 Oct.

Abstract

Background Auto-polymerizing acrylic resins, composed primarily of poly(methyl methacrylate) and methyl methacrylate, are crucial in prosthetic dentistry due to their ease of use, cost-effectiveness, and acceptable aesthetics, polymerizing at room temperature to form solid polymer networks. One of the most important mechanical properties of these resins is flexural strength, which is essential for their performance under continuous masticatory forces. In clinical applications, prosthetic materials endure repetitive stress from chewing, and resins with higher flexural strength are better equipped to resist deformation and fractures. This property is vital for ensuring the long-term integrity of prostheses, minimizing the risk of material failure, and enhancing prosthetic longevity, thus contributing to better clinical outcomes and patient satisfaction. Objective Resins with superior flexural strength, such as DPI, provide better clinical outcomes. High flexural strength minimizes the risk of material failure in high-stress areas, especially in extensive restorations like temporary bridges or denture repairs. For clinicians, using materials with greater strength reduces the likelihood of restoration failure, ensuring more reliable performance and fewer interventions for repair or replacement. This study aims to evaluate and compare the flexural strength of three commercially available auto-polymerizing acrylic resins, Pyrax (Pyrax International, Uttarakhand, India), DPI (Dental Products of India, Mumbai, India), and Quick Ashvin (National Dental Supply Company, Delhi, India), to determine their suitability for various dental applications. Methodology Following American Dental Association specifications, 20 rectangular bar-shaped specimens (25 mm x 2 mm x 2 mm) of each resin type were prepared. The resins were mixed according to manufacturer instructions, poured into molds, and allowed to auto-polymerize at room temperature. Post-polymerization, specimens were immersed in artificial saliva at 37°C for 10 days to simulate oral conditions. Flexural strength was assessed using a three-point bending test on a universal testing machine, and results were analyzed using ANOVA and post-hoc Bonferroni tests. Results The flexural strength of DPI resin bars (mean=482.10 MPa, SD=17.28) was significantly higher compared to both Pyrax (mean=467.82 MPa, SD=15.01) and Quick Ashvin (mean=470.17 MPa, SD=8.18). ANOVA revealed a significant difference among the resins (F=5.956, p=0.004). Post-hoc Bonferroni comparisons showed a statistically highly significant difference between DPI and Pyrax (p=0.006) and a significant difference between DPI and Quick Ashvin (p=0.028). No significant difference was observed between Pyrax and Quick Ashvin (p=1.000). Conclusion DPI resin, with its superior flexural strength, is the best choice for high-stress dental applications, while Quick Ashvin offers balanced performance for interim uses such as temporary crowns. Pyrax, being more cost-effective, is suitable for less demanding cases. This study underscores the importance of selecting materials based on mechanical properties and calls for further research to enhance resin durability. For dental practitioners, DPI is ideal for long-lasting restorations, Quick Ashvin for temporary solutions, and Pyrax for budget-conscious cases.

摘要

背景

自聚合丙烯酸树脂主要由聚甲基丙烯酸甲酯和甲基丙烯酸甲酯组成,因其使用方便、成本效益高且美观性尚可,在口腔修复学中至关重要,它能在室温下聚合形成固体聚合物网络。这些树脂最重要的机械性能之一是弯曲强度,这对其在持续咀嚼力作用下的性能至关重要。在临床应用中,修复材料承受着来自咀嚼的反复应力,弯曲强度较高的树脂更能抵抗变形和断裂。此性能对于确保修复体的长期完整性、降低材料失效风险以及提高修复体寿命至关重要,从而有助于实现更好的临床效果和患者满意度。

目的

具有卓越弯曲强度的树脂,如DPI,能提供更好的临床效果。高弯曲强度可将高应力区域材料失效的风险降至最低,尤其是在诸如临时桥或义齿修复等大面积修复中。对于临床医生而言,使用强度更高的材料可降低修复失败的可能性,确保更可靠的性能,并减少修复或更换的干预次数。本研究旨在评估和比较三种市售自聚合丙烯酸树脂Pyrax(Pyrax International,印度北阿坎德邦)、DPI(印度牙科产品公司,印度孟买)和Quick Ashvin(国家牙科供应公司,印度德里)的弯曲强度,并确定它们在各种牙科应用中的适用性。

方法

按照美国牙科协会的规范,为每种树脂类型制备20个矩形棒状试样(25毫米×2毫米×2毫米)。树脂按照制造商说明进行混合,倒入模具中,并在室温下自聚合。聚合后,将试样在37°C的人工唾液中浸泡10天以模拟口腔环境。使用万能试验机通过三点弯曲试验评估弯曲强度,并使用方差分析和事后邦费罗尼检验分析结果。

结果

DPI树脂棒的弯曲强度(平均值 = 482.10兆帕,标准差 = 17.28)显著高于Pyrax(平均值 = 467.82兆帕,标准差 = 15.01)和Quick Ashvin(平均值 = 470.17兆帕,标准差 = 8.18)。方差分析显示树脂之间存在显著差异(F = 5.956,p = 0.004)。事后邦费罗尼比较显示DPI与Pyrax之间存在统计学上的高度显著差异(p = 0.006),DPI与Quick Ashvin之间存在显著差异(p = 0.028)。Pyrax与Quick Ashvin之间未观察到显著差异(p = 1.000)。

结论

DPI树脂因其卓越的弯曲强度,是高应力牙科应用的最佳选择;而Quick Ashvin在诸如临时冠等临时用途方面提供了平衡的性能。Pyrax更具成本效益,适用于要求较低的情况。本研究强调了根据机械性能选择材料的重要性,并呼吁进一步研究以提高树脂的耐久性。对于牙科从业者而言,DPI适用于持久修复,Quick Ashvin适用于临时解决方案,Pyrax适用于注重成本的情况。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d889/11574572/b6b9a2c1366d/cureus-0016-00000071905-i01.jpg

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