ROEN0410

I 11 case report _ calcified mandibular molar I roots4_2010 In this case, visualisation and magnification were obtained through the OM (OPMI pico, Carl Zeiss). Photographs were taken with a Canon PowerShot A650 IS (Canon) mounted on the FlexioStill adapter (Carl Zeiss). I removed the carious dentine with LN burs (DENTSPLY Maillefer). There was a great deal of cal- cified tissue in the pulp chamber (Fig. 3), which I also removed with LN burs. The calcium hydroxide was easily removed with 10% citric acid. After a clean opening cavity had been created, the actual root-canal treatment was begun. Two mesial canals were located and coronally pre-flared with ProTaper SX (DENTSPLY Maillefer; Fig. 4). Working length was determined with an ISO size 10 K-file (DENTSPLY Maillefer; Table I) and the Root ZX mini apex locator (J. Morita Europe). A glide path was then established with K-Flexofiles sizes 15 and 20. Cleaning was performed with 3% NaOCl, which was ultrasonically activated with an Irrisafe tip (Sa- telec) several times throughout the procedure. The ultrasonicactivationoftheirrigatingsolutionresults inmoreeffectiveremovaloforganictissue,debrisand planktonic bacteria.4 It is a very easy and inexpensive procedureandshouldbeincorporatedineveryendo- dontic routine. ShapingwasdonewithProTaperfilesS1,S2andF1 in the mesial canals and ProTaper file F2 in the distal canal,givingthecanalsufficienttaperbutasmallapi- caldiameter.Manycontroversiesexistaboutshaping the apical diameter. I prefer an apical diameter of at Fig. 4_Locating the mesial canals. Table I_Working lengths and apical diameters of the canals. Fig. 5_Fractured Irrisafe tip. Fig. 6_Removed Irrisafe tip. Fig. 7_Confirmation radiograph. Fig. 5 Fig. 6 Fig. 7 Size in mm Working length MAF Reference point Oral D 21.5 mm 35 DB cusp MB 21.5 mm 30 MB cusp ML 22.5 mm 30 ML cusp Table I Fig. 4