Dynamic Photoelastic Analysis of Stress Distribution in Simulated Canals Using Rotary Instruments with Varied Tip and Taper Sizes: A Quasi-3D Approach

IF 3.5 2区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Journal of endodontics Pub Date : 2024-08-01 DOI:10.1016/j.joen.2024.05.008
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Abstract

Introduction

To compare the stress produced on the walls of simulated canals by rotary instruments with varied tip and taper sizes.

Methods

Ninety isotropic transparent blocks, each containing a 60-degree curved canal, were distributed into 18 groups (n = 5) based on the instrument tip (sizes 10, 15, 20, 25, 30, and 35) and taper (sizes 0.02, 0.04, and 0.06). The blocks were fixed in a circular polariscope setup for dark field analysis. A digital camera was employed to capture the real-time birefringence patterns generated by each instrument. Digital image frames, corresponding to the instrument reaching the end of each canal third, were extracted and evaluated by 2 independent observers for the stress generation on canal walls. The data analysis employed a semi-quantitative scale ranging from 0 to 5. Cohen's Kappa coefficient test was used to determine the inter-observer agreement while the results were compared using Kruskal–Wallis test followed by an all-pairwise posthoc procedure (α = 5%).

Results

Inter-observer agreement was 0.95. A significant influence of the tip size on stress was observed across the coronal (P = .011), middle (P = .006), and apical (P = .026) thirds. In contrast, taper size did not affect the stress induced at the coronal (P = .509), middle (P = .958), or apical (P = .493) thirds. The variations in tip and taper sizes did not result in a significant stress differences among the thirds (P = .181).

Conclusions

The stress significantly increased across all canal thirds with larger tip sizes of rotary instruments, whereas the taper sizes did not influence the stress when compared to the canal thirds.

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使用不同尖端和锥度的旋转仪器对模拟运河中的应力分布进行动态光弹性分析:准三维方法
方法将九十个各向同性的透明块(每个块包含一个 60 度弯曲的牙槽骨)根据器械尖端(10、15、20、25、30 和 35 号)和锥度(0.02、0.04 和 0.06 号)分成 18 组(n = 5)。色块被固定在一个圆形偏振镜装置中进行暗场分析。数码相机用于捕捉每个仪器产生的实时双折射模式。提取仪器到达每三分之一管壁末端时的数字图像帧,并由两名独立观察者对管壁上产生的应力进行评估。数据分析采用 0 至 5 的半定量量表。结果观察者之间的一致性为 0.95。在冠状(P = .011)、中间(P = .006)和顶端(P = .026)三部分观察到牙尖大小对应力有明显影响。相反,锥度大小对冠状面(P = .509)、中部(P = .958)和顶端(P = .493)三部分的应力没有影响。结论旋转器械的尖端尺寸越大,所有三通管的应力都会显著增加,而锥体尺寸与三通管相比对应力没有影响。
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来源期刊
Journal of endodontics
Journal of endodontics 医学-牙科与口腔外科
CiteScore
8.80
自引率
9.50%
发文量
224
审稿时长
42 days
期刊介绍: The Journal of Endodontics, the official journal of the American Association of Endodontists, publishes scientific articles, case reports and comparison studies evaluating materials and methods of pulp conservation and endodontic treatment. Endodontists and general dentists can learn about new concepts in root canal treatment and the latest advances in techniques and instrumentation in the one journal that helps them keep pace with rapid changes in this field.
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