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Dental Tribune United Kingdom Edition No.3, 2017

14 TRENDS & APPLICATIONS Dental Tribune United Kingdom Edition | 3/2017 Mastering fl are preparations with One Flare Description of a new thermally treated instrument that simplifi es access to the apex By Dr Franck Diemer, France; Dr Jean-Philippe Mallet, France; Haifa Ben-Rejeb, Tunisia & Dr Walid Nehme, Lebanon 1 2 Fig. 1: Schilder triangle, mineralisation of the root canal entrance. — Fig. 2: Creating the access cavity and radiograph with scouting fi le in place (MB1 and MB2). The mineralisation of the root canal entrance limited the initial catheterisation. use of fi les and to optimise initial preparation for endodontic treat- ment, it must be removed (Fig. 2). Generic instruments such as Gates– Glidden or Largo drills have been used for this purpose, but they present a risk of effecting major changes to the root canal anatomy, particularly in the case of the endo- dontic treatment of multirooted teeth.3 This challenge was the rea- son for the development of specifi c instruments such as ENDOFLARE (MICRO-MEGA) and ProTaper Uni- versal SX (DENTSPLY, now Dentsply Sirona). A new generation of these fi les, whose design has benefi ted from advanced technologies re- lated to asymmetry, cross section and thermal treatment, is now available in the form of MICRO- MEGA’s One Flare. At only 17 mm, One Flare is rela- tively short in order to be able to work at the root canal entrance at the corono-radicular junction. It features a triple-helix cross section, which has been found to be one of the sturdiest among those that are currently used in clinical practice. Like the one of Revo-S or One Shape (MICRO-MEGA), this cross section is asymmetrical, but with a progres- sion from the tip to the shaft for op- timised fl exibility. One Flare has a constant cone taper of 9 % and a tip diameter of 0.25 mm. This tip gives the fi le extraordinary strength while remaining suffi ciently thin to be able to easily penetrate after a scouting fi le. The sharpened section of the in- strument (13 mm) is made from For more than 20 years, the use of nickel-titanium (NiTi) in endodon- tics has allowed the speed, quality and reproducibility of root canal therapy to be improved. Over the same period, the geometry of the rel- evant instruments has evolved sig- nifi cantly too. In 2008, the appear- ance of the asymmetrical cross sec- tion with Revo-S1 (MICRO-MEGA) al- lowed for fewer restrictions2 and the cleaning capacity of endodontic in- struments to be improved. MICRO- MEGA’s mastering of NiTi machining and changes in cross section and sur- face treatments (electropolishing and thermal treatment) have cre- ated a new instrument dedicated to enlarging root canal entrances. The corono-radicular junction sometimes produces a particular form of mineralisation that par- tially obstructs root canal en- trances. To give an example, some- times this triangular mineralisa- tion, at the level of the root canal en- trances to the molars, is located opposite the furcation (Fig. 1). In or- der to prevent it from limiting the AD R R R R R R

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