the treatment of in completely formed pulpless teeth has presented considrable problems. these teeth have wide open apexes and the walls of the root canal diverge toward the apical tissues. mechanical preparation cannot be done in the normal manner beacause of the large initial size and the taper of apical part of the canal , a mechanical stop cannot be produced at the apex of the canal and , t...

A comparison of transportation and time of canal preparation with stainless steel hand instruments and Ni-Ti rotary systems (In – Vitro) Dr. MR. Sharifian* - Dr. MH. Nekoofar* - Dr. P. Motahari** - Dr. A. Tavakoli*** *-Assistant Professor of Endodontics Dept. – Faculty of Dentistry – Tehran University of Medical Sciences. **- Assistant Professor of Oral and Maxillofacial Pathology Dept. – Facul...

Comparative study on canal preparation by three rotary sys-tems using CT scan (An in vitro study) Dr. M.H. Zarrabi* - Dr. A. Talati** - Dr. S. Moradi** - Dr. L. Shakeri*** * - Associate Professor and Chief of Endodontics Dept. - Faculty of Dentistry – Mashhad University of Medical Sciences. **- Assistant Professor of Endodontics Dept. - Faculty of Dentistry – Mashhad University of Medical Scien...

Background and Objective: The preparation of the root canal (i.e., cleaning and shaping) is the main step in the endodontic treatment. The nickel-titanium rotary files result in fewer errors during the preparation of curved canals. This study aimed to compare the transportation of Neolix and Reciproc rotary systems in curved canals using cone beam computed tomography (CBCT). Materials and Meth...

Background and Aim: The role of applying rotary instruments in reducing preparation time and proper root canal preparation have been approved in permanent teeth. The aim of this study was to compare the rotary instruments (Hero642) and K-files in root canal preparation of primary molars. Time and canal transportation were compared. Materials and Methods: In this experimental, invitro study, 30...

Background and Aim: Recent advances in technology have permitted manufacturers to produce endodontic files from NiTi alloy and rotary systems. According to manufacturers, these files maintain original canal shape better than hand files and reduce treatment time. The aim of this study was to compare a new rotary system (Race) with an older one (Profile) in maintaining the original shape of curve...

Background and Aims: Cleaning and shaping is one of the most important stages in endodontic treatment. Single-file systems save time and reduce the risk of transmission of pathogens. This in vitro study was aimed to compare the rate of canal transportation after the preparation of the stimulated resin root canal with two single-file systems, namely Waveone and Reciproc. Materials and Met...

Comparison of canal transportation after preparation by 3 different rotary systems Dr. Javidi, M.* - Dr. Zarei, M.* - Dr. Vatanpour, M.** *Assistant Professor of Endodontics Dept., Faculty of Dentistry, Mashhad University of Medical Sciences. **Assistant Professor of Endodontics Dept., Faculty of Dentistry, Tehran Azad University. Abstract Background & Aim: Cleaning and shaping has been recogni...