The Effect of surface topographical changes of two different surface treatments rotary instrument

• Nashwan-Ahmed Qaed ^[1] ; Bilal-Diab Mourshed ^[2] ; Hashem-Motahir Al-Shamiri ^[3] ; Nader Alaizari ^[4] ; Saleh-Sulaiman Alhamdah ^[5]
  1. [1] BDS, MSc, Lecturer, Department of restorative Dentistry, Al-Farabi Colleges, Riyadh, Saudi Arabia
  2. [2] BDS, MSc, Lecturer, Department of Prosthetic Dental Sciences, Al-Farabi College for Dentistry and Nursing, Riyadh, Saudi Arabia; Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University at Kiel, Kiel, Germany
  3. [3] BDS, MSc, Lecturer- Department of Oral and Maxillofacial Surgery, Al-Farabi Colleges, Riyadh, Saudi Arabia
  4. [4] BDS, MSc, Lecturer, Department of Oral Medicine and Diagnostic Sciences, AlFarabi Colleges, Riyadh, Saudi Arabia
  5. [5] BDS, Al-Farabi Dental College, Riyadh, Saudi Arabia

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• Localización: Journal of Clinical and Experimental Dentistry, ISSN-e 1989-5488, Vol. 10, Nº. 1 (January ), 2018, págs. 49-53
• Idioma: inglés
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• Resumen

  • One of the major innovations in endodontics has been the introduction of nickel-titanium (NiTi) alloy. This study evaluated the surface topographical changes of two different surface treatments rotary instrument after instrumentation and sterilization.

    240 Extracted teeth were included in this study. 90 new AlphaKite and Revo-S NiTi rotary instruments were selected and divided into two groups (Group A 45 AlphaKite and group B 45 Revo-S). Each group were divided into three subgroups: (A1, B1) n=5 files were used as a control, (A2,B2) n=20 files were used to prepare three root canals using endodontic rotary motor then sterilized by autoclave for one cycle under 121°C at 15 psi for 30 minutes and (A3,B3) n=20 files were used to prepare nine root canals using the same rotary system then sterilized by autoclave for three cycles under 121°C at 15 psi for 30 minutes. Files were examined under scanning electron microscopy.

    On examining the AlphaKite, A1 revealed gross machining grooves on their surface with no pits, A2 showed disruption of cutting and A3 showed microcracks and deepening of the machining grooves. B1 showed a smoother surface with few machining grooves, B2 showed dulling and blunting of the cutting edges was predominant and B3 files showed plastic deformation in the form of unwinding of the flutes.

    The defects were less distributed along the electropolished Revo-S files than the physical vapor deposition AlphaKite.