CleaningandShapingoftheRootCanalSystemPartII.pptVIP

Cleaning and Shaping of the Root Canal System. Part II Edit by Hou Tiezhou 02988088507 Root Canal Instrumentation Estimate working length Verify canal patency Estimate canal size Establish actual working length Root Canal Instrumentation Crown down preparation Coronal third Middle third Apical third Armamentarium Armamentarium Armamentarium Stainless steel size 10 K-files Used to explore canal patency Filing or quarter turn pull motion Do not rotate through 360 degrees Armamentarium Stainless steel size 15 and 20 K files Used to establish actual working length Armamentarium Armamentarium Profile orifice shapers Used to prepare the coronal one third of the root canal Profile Orifice Shapers Armamentarium Profile 0.06 taper rotary files Used to prepare the middle third Armamentarium Armamentarium Profile 0.04 taper hand NiTi files Used to prepare the apical third of the root canal Armamentarium Estimated Working Length Estimated working length is the distance from the reference point to the radiographic apex, as measured on a parallel preoperative radiograph Estimated working length Take a pre-operative parallel radiograph Clinically, use a XCP film holder Estimated working length Estimate canal size Radiographic appearance Crown/root morphology Standardized sizes (See table in manual) Estimate canal size Explore Canal Patency Ensure that canal can be negotiated to radiographic apex Select #10 K file Precurve file if necessary Explore Canal Patency Explore Canal Patency Establish Actual Working length Instrumentation should terminate at: The apical constriction 1 mm short of radiographic apex Actual WL = Estimated WL – 1 mm Establish actual working length WL can be established using: Radiographs Apex locator Establish Actual Working Length Establish Actual Working Length Establish Actual Working Length Establish Actual Working Length Crown Down Preparation Crown Down Preparation Crown-down preparation Plastic incisor with transparent root Crown-down preparation Pl