Impact of Autoclave Sterilization on Microstructure of Two Niti Endodontic Rotary File Systems: A Differential Scanning Calorimetric Analysis.
Journal Title: Journal of Biomedical and Pharmaceutical Research - Year 2017, Vol 6, Issue 3
Abstract
Introduction: Autoclaving is the most common and most efficient sterilization method used to sterilize endodontic files. But the effect of heating and cooling cycle’s occurring during sterilization on the physical and mechanical properties of niti files has not been clearly stated. Nitinol alloys exhibit two unique features that are relevant to endodontics: shape memory (SM) and super elasticity (SE). Both these features are as a result of reversible transformation of the austenite (parent phase) to the marten site (daughter phase). This phase transformation is thermo elastic. It can be induced by cooling or application of stress. The reverse transformation takes place, when the metal is heated or stress is released. Phase transformations are associated with significant changes in mechanical properties of the alloy. Thus the structure of NiTi is important to the clinical performance. Some studies have been done in the past which report about changes in properties of the NiTi instruments after heat sterilization. Aims and objectives: The aim and objectives of this study are to analyze the microstructure and phase changes of Protaper and Race NiTi instruments at 0 and 5 cycles of moist heat sterilization by using differential scanning calorimetry.
Authors and Affiliations
Bahavathi Ananthan Hemasathya| M.D.S., Reader, Department of Conservative Dentistry and Endodontics, Tagore Dental College and Hospital, Chennai-600127, Mahendran Kavitha| M.D.S., Professor & Head of the Department, Department of Conservative Dentistry and Endodontics, Tamilnadu Govt. Dental College and Hospital, Chennai-600001., Govindasamy Padmini| M.D.S., Ex –Professor & Head of the Department (Retired), Department of Conservative Dentistry and Endodontics, Tamilnadu Govt. Dental College and Hospital, Chennai-600001.
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