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PUBLISHED IN DUBAI www.dental-tribune.me July-August 2017 | No. 4, Vol. 7 Treatment of 16 with severe curvature By Dr. Justin Dinley, UK The patient presented with a contin- uous dull ache, tenderness to percus- sion and apical palpation. There was no response to vitality testing. The 16 was a NWSI requiring post treatment cuspal coverage. The diagnosis was acute apical periodontitis The patient was anesthetised with a buccal infi ltration of Lignospan® (2% lidocaine hydrochloride, adrenaline 1:80000) and palatal infi ltration from the numb buccal aspect. The 16 had Caulking placed around the gingival margin and rubber dam and a clamp placed to allow for an aseptic technique. It is an essential component in an aseptic endodontic technique in which its benefi ts far out weigh its disadvantages (Ahmad, A. 2009) Access was achieved with a tapered 554 and an EndoZ safe end cutting TTungsten carbidebur. On access there was suppuration of pus from the palatal canal, however the buccal canals were vital and hyperaemic. The access chamber was cleaned with 2%(5.25%) Naocl and ultrasonic instrumentation prior to any access into the canals from the coronal por- tion of the tooth. A 35/08 race instrument was used to minimally to coronally the canal ori- fi ces, additional access was achieved with a ETBD ball ended diamond coated ultrasonic tip Satalec®. Initially the mesial canals were scouted with size .06, .08, and .10 k- fl ex handfi lies (Dentsply Maillefer) to confi rm the degree of curvature (Schneider 1971) Conventional ISO 10 and 15 fl ex-o- fi les were used to scout the pala- tal and disto buccal canals prior to obtaining a zero reading with an electronic length measuring device (Root ZX Morita Inc. R) The Radiograph showed an approxi- mate curvature of 90° with a larger radius in the MB1 and a smaller radi- us signifying a more acute curvature in the MB2. Root canal curvature is measured according to Schneider 1971 and clas- sifi ed as mild <5°, moderate 10-25° and severe >25°. This paper however did not discuss the radius of the cur- vature as the smaller the radius the higher the risk of cyclic fatigue (Pru- ett 1997) The square of the diameter, doubles the amount of cyclic fatigue, implying that as the taper increases ÿPage A2 3D agility_ The One to Shape your Success Only one instrument to achieve min. 30/.04 Superelasticity and expansion capacity Remarkagle cyclic fatigue resistance A gentle, non-agressive and conservative treatment Excellent degris removal FKG Dentaire SA www.fkg.ch