Dr.Franck Diemer



Dental Surgery Doctorate from the University of Toulouse (1995)

Master in Science and Medical Biology (1998)

Postgraduate diploma in pedagogy (2001)

PhD from Paul Sabatier University (2006)

Full Professor and Head of Endodontics department at Faculty of Dental Surgery - University of Toulouse

Member of the French National College of Teachers in Dentistry (CNEOC)

Vice-president of the French Society of Endodontics (SFE)

Member of the scientific committee of Toulouse at Faculty of Dental Surgery

Dr. Diemer has full hospital practice and is attached to the Clement Ader Institute (Surface, Machining, Materials and Tools team – UMR CNRS 5312)

He has presented numerous lectures and continuing education, and published many national and international articles


  Effect of Asymmetric Geometry on the Behavior of Rotary Root Canal Instruments

     Current concepts in root canal system preparation still largely rely on mechanical instrumentation. Two major factors affect the choice of instruments for root canal preparation: its ability to achieve the root canal shaping and its safety.The file accuracy is linked to its resistance to fracture, its lack of threading in dentinal walls when used in continuous rotary motion and its ability to respect the initial canal path in curved canals. The original canal anatomy must be maintained. Most of these factors depend on the profile of the instrument and so, on the design of its active part.

        When used in a continuous rotating motion, even at low speed, Ni-Ti shaping instruments may absorb lots of constraints: torsional stresses, cyclic fatigue, and cutting fatigue. Decreasing those constraints increase the security of shaping. For this purpose, managing the initial constraints at the junction of crown and root with an opener to create sufficient space or glide path for file’s tip is strongly recommended.

       In the last decade the geometry of the instruments evolved tremendously. In 2008, the emergence of an asymmetrical cross section with the Revo-S® has reduced the constraints and improved the cleaning ability of endodontic instruments. In their quest to increase flexibility of NiTi alloy without compromising its super elastic properties, Micro Mega introduced an innovative cross section and a post machining thermo mechanical treatment called T wire. These improvements were used to produce a new opener One Flare® and a new file sequence . This short sequence, 2Shape®, will allow clinicians to shape almost all canal anatomies with only two files. The new asymmetric section will be described and its mechanical behavior will be extensively explained.

          At the end of the presentation, the participants will be able to describe the different advantages of asymmetric files, heat treatments and will be able to use OneFlare®, and 2Shape®, safely and easily in the widest range of canal anatomy.