Pulpectomy procedure
caries
STERILE, CARIES
A single visit pulpectomy procedure was carried out under strict aseptic conditions by a single trained operator (first author) who had experience in pediatric endodontic treatment. A perioperative evaluation was done using a digital intraoral photo-simulated phosphorus plate sensor (PSP, Planmeca ProSensor HD, Helsinki, Finland) before starting pulpectomy treatment. The teeth were anesthetized with 2% mepivacaine with 1:20,000 levonordefrin(Alexandria Co.) and isolated using a rubber dam (Midwest Dental, Texas, USA). Firstly, caries had been removed with sterile no. 330 carbide burs in high-speed contra-angle handpiece under copious water cooling and high suction. After gaining the access opening and removing the pulp chamber’s roof, an apex locator (J. Morita MFG Corp., Kyoto, Japan), was used to assess the working length, then affirmed by a periapical radiograph. The working length was determined as 1 mm less than the apex.Root canals were explored for patency with #10 K-file also, to establish a glide path before instrumentation. Manual preparation with the # 20 K-file was done before introducing the rotary files. Then, all canals were instrumented using Kidzo rotary file system (Elephant dental supplies LTD, China) in a lateral brushing motion following the manufacturer’s instructions. The rotary files were used with an Endo-Mate DT endodontic motor (NSK, Tokyo, Japan) at 350 RPM and 2.5 N/cm torque in the following order: # 25/0.04 and # 30/0.04 [Root canal filling was prepared as a fresh mix of 0.2 gm of zinc oxide powder mixed with 0.07 ml of ozonated olive oil, olive oil, and eugenol for groups I, II, and III respectively based on Tchaou et al.’s [