Beyond the Surface: Engineered Nanocoating Reshapes NiTi Instrument Behaviour—A Laboratory Study
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Le résumé fourni par la source
AIM: To compare the geometric and metallurgical features and mechanical performance of two contemporary reciprocating nickel-titanium instruments manufactured with and without additional engineered nanocoating technology. METHODOLOGY: Excalibur (n = 57) and Excalibur Pro (n = 57) size 25/0.05 instruments were evaluated. Geometric and surface characteristics were assessed by scanning electron microscopy and 3D optical scanning with model superimposition. Elemental composition and phase transformation behaviour were characterized by energy-dispersive X-ray spectroscopy and differential scanning calorimetry, respectively. Mechanical performance was evaluated through cyclic fatigue resistance, maximum torque, angle of rotation at fracture, bending and buckling resistance, cutting efficiency and surface microhardness. Data were compared using independent-samples Student's t-test, Mann-Whitney U test, or a linear mixed-effects model, as appropriate, with significance set at 5%. RESULTS: The instruments showed high geometric correspondence, with only subtle differences in tip configuration and both exhibited a near-equiatomic NiTi composition. Differential scanning calorimetry revealed distinct phase transformation profiles, with Excalibur Pro showing lower transformation temperatures than Excalibur. No significant differences were observed in cyclic fatigue resistance or cutting efficiency (p > 0.05). Excalibur exhibited higher maximum torque (p < 0.001), buckling resistance (p = 0.029) and surface microhardness (p = 0.001). Conversely, Excalibur Pro showed a greater angle of rotation at fracture (p = 0.005) and required a higher load to achieve 45° deflection (p < 0.001), indicating lower flexibility. CONCLUSION: The reciprocating NiTi instruments with and without an engineered nanocoating exhibited distinct metallurgical and mechanical profiles despite their high geometric similarity and comparable elemental composition. The nanocoated instrument showed lower phase transformation temperatures and a distinct balance of torsional, bending, buckling and microhardness properties, while no statistically significant differences were detected in cyclic fatigue resistance or cutting efficiency between instruments. These findings demonstrate that the nanocoated instrument exhibits a distinct overall mechanical profile, which should be interpreted as reflecting the combined contribution of surface characteristics and thermomechanical features rather than the effect of the nanocoating alone.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé, mais le titre doit être comparé manuellement.
- Titre Crossref
- Beyond the Surface: Engineered Nanocoating Reshapes <scp>NiTi</scp> Instrument Behaviour—A Laboratory Study
- Date Crossref
- 12/09/2026
- Éditeur
- Wiley
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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University of Lisbon pays non établi dans la noticeUniversité ou école supérieure
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Laboratório de Instrumentação Engenharia Biomédica e Física da Radiação pays non établi dans la noticeUniversité ou école supérieure
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Universidade Federal do Rio de Janeiro pays non établi dans la noticeUniversité ou école supérieure
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Universidade Unigranrio pays non établi dans la noticeUniversité ou école supérieure
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Escola Superior de Saúde Egas Moniz pays non établi dans la noticeUniversité ou école supérieure
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Bulgarian Academy of Sciences pays non établi dans la noticeOrganisme public
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Institute of Mineralogy pays non établi dans la noticeStructure de recherche
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Centro de Investigação em Materiais pays non établi dans la noticeStructure de recherche
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Universidade Nova de Lisboa pays non établi dans la noticeUniversité ou école supérieure
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Federal Police of Brazil pays non établi dans la noticeOrganisme public
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Universidade de Lisboa Lisboa Portugal Centro de Estudo de Medicina Dentária Baseada Na Evidência (CEMDBE) ‐ Cochrane Portugal Faculdade de Medicina Dentária pays non établi dans la noticeUniversité ou école supérieure
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Grande Rio University (UNIGRANRIO) Rio de Janeiro Rio de Janeiro Brazil BIOTRANS Postgraduate Program pays non établi dans la noticeUniversité ou école supérieure
University of Lisbon, Laboratório de Instrumentação Engenharia Biomédica e Física da Radiação et Universidade Federal do Rio de Janeiro, avec 9 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.