Qaed Nashwan-Ahmed, Mourshed Bilal-Diab, Al-Shamiri Hashem-Motahir, Alaizari Nader, Alhamdah Saleh-Sulaiman
BDS, MSc, Lecturer, Department of restorative Dentistry, Al-Farabi Colleges, Riyadh, Saudi Arabia.
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.
J Clin Exp Dent. 2018 Jan 1;10(1):e49-e53. doi: 10.4317/jced.54472. eCollection 2018 Jan.
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. Endodontic instruments, electropolished, rotary, sterilization.
牙髓病学的主要创新之一是引入了镍钛（NiTi）合金。本研究评估了两种不同表面处理的旋转器械在预备和消毒后的表面形貌变化。
本研究纳入240颗拔除牙。选择90支新的AlphaKite和Revo-S NiTi旋转器械并分为两组（A组45支AlphaKite和B组45支Revo-S）。每组再分为三个亚组：（A1、B1）n = 5支锉作为对照，（A2、B2）n = 2０支锉使用牙髓旋转马达预备三个根管，然后在121°C、15 psi下高压灭菌一个周期30分钟，（A3、B3）n = 2０支锉使用相同的旋转系统预备九个根管，然后在121°C、15 psi下高压灭菌三个周期30分钟。在扫描电子显微镜下检查锉。
检查AlphaKite时，A1显示其表面有粗大的加工沟槽且无凹坑，A2显示切削刃破坏，A3显示有微裂纹且加工沟槽加深。B1显示表面较光滑，加工沟槽较少，B2显示切削刃钝化为主要特征，B3锉显示出以凹槽展开形式的塑性变形。
与物理气相沉积的AlphaKite相比，电解抛光的Revo-S锉上的缺陷分布较少。牙髓器械，电解抛光，旋转，消毒。
