A New Device to Test the Bending Resistance of Mechanical Endodontic Instruments

The aims of the present study were to propose a new machine for testing the bending behavior of an instrument at multiple specific points along the cutting surface and to compare the influence of proprietary heat treatment on the bending ability of EdgeTaper (ET), Protaper Universal (PTU), EdgeTaper...

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Bibliographic Details
Published inApplied sciences Vol. 10; no. 20; p. 7215
Main Authors Miccoli, Gabriele, Cicconetti, Andrea, Gambarini, Gianluca, Del Giudice, Andrea, Ripanti, Federico, Nardo, Dario Di, Testarelli, Luca, Seracchiani, Marco
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 15.10.2020
Subjects
Bend tests
bending ability
Bending machines
Design
Endodontics
Flexibility
Heat treatment
Heat treatments
Materials
Mechanical properties
Metal fatigue
Nickel alloys
nickel–titanium
Plastic deformation
Platinum
Proprietary
Stainless steel
Statistical analysis
Testing
Titanium alloys
Italy
United States > US
Switzerland
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Summary:The aims of the present study were to propose a new machine for testing the bending behavior of an instrument at multiple specific points along the cutting surface and to compare the influence of proprietary heat treatment on the bending ability of EdgeTaper (ET), Protaper Universal (PTU), EdgeTaper Platinum (ETP), and Protaper Gold (PTG). A total of 320 instruments were examined in the present study: 80 ET, 80 PTU, 80 ETP, and 80 PTG. The bending ability of all instruments was tested at a 45° angle and on three different portions of the instrument at 3, 6, and 9 mm from the tip using a customized device. Statistical analysis showed significant differences among each single instrument of the series and between ET and PTU as well as ETP and PTG. The bending behavior of a nickel–titanium rotary instrument is its ability to bend without any plastic deformation. This feature, according to the results of the present study, is variable along the cutting surface; therefore, it should be evaluated. Due to the present testing device, it would be possible to obtain reliable and trustworthy information about an instrument’s bending ability.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10207215