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Differential Scanning Calorimetric (DSC) Analysis of Rotary Nickel-Titanium (NiTi) Endodontic File (RNEF)

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Abstract

To determine the variation of A f along the axial length of rotary nickel-titanium endodontic files (RNEF). Three commercial brands of 4% taper RNEF: GTX (#20, 25 mm, Dentsply Tulsa Dental Specialties, Tulsa, OK, USA), K3 (#25, 25 mm) and TF (Twisted File #25, 27 mm) (Sybron Kerr, Orange, CA, USA) were cut into segments at 4 mm increment from the working tip. Regional specimens were measured for differential heat-flow over thermal cycling, generally with continuous heating or cooling (5 °C/min) and 5 min hold at set temperatures (start, finish temperatures): GTX: −55, 90 °C; K3: −55, 45 °C; TF: −55, 60 °C; using differential scanning calorimeter. This experiment demonstrated regional differences in A f along the axial length of GTX and K3 files. Similar variation was not obvious in the TF samples. A contributory effect of regional difference in strain-hardening due to grinding and machining during manufacturing is proposed.

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Acknowledgment

This paper was financially supported by the CityU SRG Grant # 7002691.

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Authors and Affiliations

  1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, China

    Ray Chun Tung Wu & C. Y. Chung

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  1. Ray Chun Tung Wu
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  2. C. Y. Chung
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Correspondence to C. Y. Chung.

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Wu, R.C.T., Chung, C.Y. Differential Scanning Calorimetric (DSC) Analysis of Rotary Nickel-Titanium (NiTi) Endodontic File (RNEF). J. of Materi Eng and Perform 21, 2515–2518 (2012). https://doi.org/10.1007/s11665-012-0269-1

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  • DOI: https://doi.org/10.1007/s11665-012-0269-1

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