Isolating design variables by assessing the impact of cross-section geometry on the mechanical performance of nickel-titanium rotary instruments: a comparative in vitro study.

IF 1.5

Restorative Dentistry & Endodontics Pub Date : 2025-08-01 Epub Date: 2025-07-24 DOI:10.5395/rde.2025.50.e28

Anne Rafaella Tenório Vieira, Guilherme Ferreira da Silva, Emmanuel João Nogueira Leal da Silva, Rodrigo Ricci Vivan, João Vitor Oliveira de Amorim, Thaine Oliveira Lima, Raimundo Sales de Oliveira Neto, Marco Antonio Hungaro Duarte, Murilo Priori Alcalde

{"title":"Isolating design variables by assessing the impact of cross-section geometry on the mechanical performance of nickel-titanium rotary instruments: a comparative in vitro study.","authors":"Anne Rafaella Tenório Vieira, Guilherme Ferreira da Silva, Emmanuel João Nogueira Leal da Silva, Rodrigo Ricci Vivan, João Vitor Oliveira de Amorim, Thaine Oliveira Lima, Raimundo Sales de Oliveira Neto, Marco Antonio Hungaro Duarte, Murilo Priori Alcalde","doi":"10.5395/rde.2025.50.e28","DOIUrl":null,"url":null,"abstract":"Objectives: This study aimed to assess the effect of cross-section geometry on the mechanical properties of nickel-titanium (NiTi) instruments by comparing two instruments with identical tip size, taper, and thermal treatment but differing in cross-section design.Methods: One hundred four NiTi rotary instruments, being S-shaped and triangular cross-section, manufactured with Blueish thermal treatment, were tested (n = 52 per group). Differential scanning calorimetry was employed, and the metal mass volume and cross-section area were assessed. The cyclic fatigue, torsional, and bending resistance tests were assessed. Data were analyzed using the Kolmogorov-Smirnov and Student t tests, and the level of significance was set at 5%.Results: The instruments exhibited similar start and finish temperatures of phase transformation. The S-shaped instruments had significantly lower metal mass volume and cross-sectional area (p < 0.05). S-shaped instruments demonstrated superior cyclic fatigue resistance, greater angular deflection, and lower bending stiffness (p < 0.05).Conclusions: Cross-section geometry significantly influences the mechanical properties of NiTi rotary instruments.","PeriodicalId":21102,"journal":{"name":"Restorative Dentistry & Endodontics","volume":"50 3","pages":"e28"},"PeriodicalIF":1.5000,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12415243/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Restorative Dentistry & Endodontics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.5395/rde.2025.50.e28","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/7/24 0:00:00","PubModel":"Epub","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 0

Abstract

Objectives: This study aimed to assess the effect of cross-section geometry on the mechanical properties of nickel-titanium (NiTi) instruments by comparing two instruments with identical tip size, taper, and thermal treatment but differing in cross-section design.

Methods: One hundred four NiTi rotary instruments, being S-shaped and triangular cross-section, manufactured with Blueish thermal treatment, were tested (n = 52 per group). Differential scanning calorimetry was employed, and the metal mass volume and cross-section area were assessed. The cyclic fatigue, torsional, and bending resistance tests were assessed. Data were analyzed using the Kolmogorov-Smirnov and Student t tests, and the level of significance was set at 5%.

Results: The instruments exhibited similar start and finish temperatures of phase transformation. The S-shaped instruments had significantly lower metal mass volume and cross-sectional area (p < 0.05). S-shaped instruments demonstrated superior cyclic fatigue resistance, greater angular deflection, and lower bending stiffness (p < 0.05).

Conclusions: Cross-section geometry significantly influences the mechanical properties of NiTi rotary instruments.

Abstract Image

查看原文本刊更多论文

通过评估截面几何形状对镍钛旋转器械机械性能的影响来隔离设计变量：一项体外比较研究。

目的：本研究旨在通过比较两种具有相同尖端尺寸、锥度和热处理但截面设计不同的镍钛（NiTi）器械，来评估截面几何形状对其力学性能的影响。方法：采用蓝纹热处理制造的s形、三角形截面NiTi旋转器械104台，每组52台。采用差示扫描量热法，测定了金属的质量体积和截面积。评估了循环疲劳、扭转和弯曲阻力试验。使用Kolmogorov-Smirnov检验和Student t检验分析数据，显著性水平设为5%。结果：两种仪器的相变起始温度和结束温度相近。s形器械的金属质量体积和截面积明显小于s形器械（p < 0.05）。s形器械表现出更强的抗循环疲劳性、更大的角挠度和更低的弯曲刚度（p < 0.05）。结论：横截面几何形状对镍钛旋转器械的力学性能有显著影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊