Influence of reuse and cervical preflaring on the fracture strength of reciprocating instruments
| Autor: | Giovani Gonçalves Ribamar, Thiane Elys Arruda, Tatyana Albuquerque Ximenes, Luis Flavio Gaspar Herculano, Cláudio Maniglia-Ferreira, Murilo Alves Teixeira Neto, Fabio de Almeida Gomes |
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| Rok vydání: | 2017 |
| Předmět: |
Orthodontics
Molar WaveOne medicine.medical_specialty Materials science 030206 dentistry Reciproc Endodontics Root canal instrumentation Dental instruments 030207 dermatology & venereal diseases 03 medical and health sciences Reciprocating motion endodontics root canal preparation 0302 clinical medicine Flexural strength Nickel titanium medicine Original Article General Dentistry |
| Zdroj: | European Journal of Dentistry |
| ISSN: | 1305-7456 |
| Popis: | Objective: This study sought to assess the influence of cervical preflaring and reuse after resterilization, on fracture strength and plastic deformation and/or surface cracking in reciprocating nickel–titanium [NiTi] endodontic instruments after root canal instrumentation of extracted human teeth. Materials and Methods: Forty engine-driven reciprocating NiTi instruments (20 Reciproc® [RC], VDW; 20 WaveOne® [WO], Dentsply) were used in root canal instrumentation of extracted human molars. A total of 485 human upper molars with similar anatomical features were selected and randomly distributed across four groups according to the instrumentation procedures performed (G1 and G3: RC; G2 and G4: WO). Reciprocating instruments were used as per manufacturer instructions. In groups G3 and G4, cervical preflaring was performed prior to instrumentation. After each use of each instrument, sterilization was repeated and scanning electron microscope (SEM) images were obtained to check for plastic deformations and/or cracks on instrument surfaces. Each instrument was used repeatedly until fracture occurred. Results: Regardless of flaring, RC files exhibited greater fracture strength than WO instruments (P |
| Databáze: | OpenAIRE |
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