Instrument Separation Analysis of Multi-used ProTaper Universal Rotary System during Root Canal Therapy
| Autor: | Guangdong Zhang, Yan Yu, Jinhua Yu, Ming Yan, Gang Lei, Jintao Wu |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Molar
Rotation Sodium Hypochlorite Surface Properties Root canal Separation (statistics) Dentistry Tooth Apex stomatognathic system Nickel Independent samples Equipment Reuse otorhinolaryngologic diseases medicine Humans Bicuspid Radiography Bitewing General Dentistry Edetic Acid Anterior teeth Mathematics Titanium Root Canal Irrigants business.industry Significant difference Equipment Design Foreign Bodies Root Canal Therapy Equipment Failure Analysis medicine.anatomical_structure Torque Microscopy Electron Scanning Stress Mechanical Dental Pulp Cavity business Root Canal Preparation Dental Alloys |
| Zdroj: | Journal of Endodontics. 37:758-763 |
| ISSN: | 0099-2399 |
| DOI: | 10.1016/j.joen.2011.02.021 |
| Popis: | Introduction: The purpose of this study was to identify the influential factors responsible for clinical instrument separation of reused ProTaper Universal rotary instruments (Dentsply Maillefer, Ballaigues, Switzerland). Methods: Six thousand one hundred fifty-four root canals in 2,654 teeth were prepared using ProTaper Universal files in endodontic clinics. Separation incidence was determined based on the number of treated teeth or canals. Data were collected including the size of fracturedinstrument,thelengthandlocationofabroken segment within the root canal, and the curvature of canal. The chi-square test and independent samples ttestwereusedtodetermine the statisticalsignificance. Results: The overall instrument separation incidences were 2.6% according to the number of teeth and 1.1% according to the canal number, respectively. Separation incidences according to the number of teeth or canals were significantly higher (P < .05) in molars than those in premolars or anterior teeth. Because of its largest diameter, F3 file presented the highest separation incidence according to the number of teeth (1.0%) or canals (0.4%); 47.5% instrument separation of mandibular molars and 61.5% instrument separation of maxillary molars happened in the mesiobuccal canals. Moreover, 91.4% fragments were located in the apical third of root canals, and 54.2% instrument separation occurred in severely curved canals. There was a significant difference (P < .05) in the mean fracture length between shaping (2.42 0.73 mm) and finishing files (3.32 0.73 mm). Conclusions: Separation incidence according to the canal number is more reliable than that according to the number of teeth because of the variable canal number in different teeth. The tooth type, rotary file size, canal location, and anatomy were correlated with the instrument separation of reused ProTaper Universal files. (J Endod 2011;37:758‐763) |
| Databáze: | OpenAIRE |
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