涡流蓝和TruNatomyTM镍钛旋转系统成形能力的微计算机层析成像评价

Research Square (Research Square) Pub Date : 2023-11-14 DOI:10.21203/rs.3.rs-3578917/v1

Batool Alghamdi, Mey Al-Habib, Lina Bahanan, Ali Alrahalah, Leonel S.J. Bautista, LOAI ALSOFI

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摘要

摘要目的:利用微型计算机断层扫描(micro-CT)技术，评估两种不同镍钛旋转系统:Vortex Blue (VB)和TruNatomy (TN)在离体人前磨牙上的根管成形能力。材料与方法:将20颗分离的上颌第一前磨牙(颊、腭两个独立管)随机分为两组，分别用Vortex Blue或TruNatomy锉进行预备。在根管预备前后对所有牙齿进行micro-CT扫描。对微ct扫描结果进行分析，测量以下参数:未触及根管表面积百分比、根管表面积变化量、根管体积变化量、结构模型指数(SMI)、根管成角变化量和牙本质厚度变化量。对两个系统参数的均值和标准差进行统计分析比较，统计学显著性水平设为P -value <0.05. 结果:VB和TN锉在根管预备后，根管的基本几何参数，包括根管表面积和根管体积都有显著增加，两种锉之间没有统计学上的显著差异，也没有明显的整形事故或错误。两种文件系统在根管预备后SMI和牙本质厚度均无显著变化。与VB锉相比，TN锉对椎管曲率的矫直效果较差，但差异无统计学意义。此外，TN锉与VB锉相比，牙本质去除较少，差异无统计学意义。TN组在冠状和根尖三分之一牙本质去除方面有显著差异。结论:Vortex Blue锉和TruNatomy锉所产生的根管预备效果相当，没有明显的成形事故或错误。两种锉在预备后均引起最小程度的根管矫直。与根尖牙本质相比，TN锉对颈牙本质的去除较少。

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Micro-Computed Tomographic Evaluation of the Shaping Ability of Vortex Blue and TruNatomyTM Ni-Ti Rotary Systems

Abstract Aim: To assess and evaluate the canal shaping ability of two different Ni-Ti rotary systems ex-vivo: Vortex Blue (VB) and TruNatomy (TN), using micro-computed tomography (micro-CT) in extracted premolar human teeth. Materials and Methods: A total of 20 extracted bifurcated maxillary first premolars with two separate buccal and palatal canals wererandomly divided into two groups and prepared with either Vortex Blue or TruNatomy files. All teeth were scanned by micro-CT before and after root canal preparations. The micro-CT scans were analyzed to measure the following parameters: percentage of untouched canal surface area, changes in canal surface area, changes in canal volume, structural model index (SMI), changes in canal angulation and changes in dentin thickness. Statistical analysis was conducted to compare the means and standard deviations of the parameters between the two systems, with statistical significance level set at P -value < 0.05. Results: Both VB and TN files exhibited a significant increase in the basic canal geometry parameters including canal surface area and canal volume after canal instrumentation with no statistical significant differences between both files and with no considerable shaping mishaps or errors. Both file systems showed no significant changes in the SMI and dentin thickness after canal instrumentation. TN files demonstrated less straightening of the canal curvature compared to VB files with no statistically significant difference. Furthermore, TN files showed less cervical dentin removal when compared to VB files with no significant difference. A significant difference was found in TN group regarding dentin removal between coronal and apical thirds. Conclusion: Vortex Blue and TruNatomy files produced comparable root canal preparation with no considerable shaping mishaps or errors. Both files induced minimal canal straightening after preparation. TN files resulted in less removal of cervical dentin compared to apical dentin.

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