Standardisation of Insttrumentation.pptx

Standardisation of instrumentation

1. Standardisation of Instrumentation Komal Ahire ; Batch A

2. Classification of endodontic instruments Exploring instruments Debriding instruments Cleaning and shaping instruments Obturating instruments To locate the canal and orifice and determine patency of root canal Example endodontic explorers, smooth brooches To extirpate the pulp and remove any foreign debris example barbed brooch To clean and shape the root canal laterally and apically Eg reamers and files To cement and pack Gutta percha into root Example spreaders , pluggers

3. Components of endodontic file TAPER : - denotes the per millimetre increase in file diameter from tip towards the file handle. The traditional ISO instruments were standardised to have 0.2 taper or 2% taper . ( FOR 20 ISO file will have tip of diameter 0.22mm 1 mm from tip ,0.24mm from 2 mm likewise..) ; Tapered instruments help in preparing canals of wider diameter without over enlarging the canal at working length Tip design :- Original stainless steel root canal instruments usually possess a sharp cutting tip however rotary instruments are currently manufactured as modified non cutting tips , These removes debris better than traditional instruments FLUTE :- It is the groove or relief on the working surface of the file which collect the debris as the file cuts through the substrate

4. Chip space:- It denotes the cleaning effectiveness of an instrument as an increase in chip space denotes improved ability to remove debris out of the root canal Blade (cutting edge ):- It is the working area of the file and is the surface with the greatest diameter that follows the flute as it rotates Land :- In certain file designs a surface projects axially from the central core to cutting edge between the flutes ; This feature is incorporated To reduce canal transportation and support the cutting edge. Pitch: - It is the distance from one cutting edge to the next. A file with short pitch will have more spirals than a file with longer pitch. Rake angle:- On perpendicular sectioning of a file the angle which the leading edge forms with the radius of a file is known as a rake angle. An obtuse angle is considered to be positive and acute angle is termed negative rake angle Helix angle:- It is the angle the cutting edge forms with the long axis of file

5. Standardisation of endodontic instruments .

6. Ingle and Levine’s standardisation of endodontic hand instruments 1. Instruments shall be numbered from 10 to 100, For 10 to 60 , each number advances by 5 units eg 10,15,20,… For 60-100 , each number advances by 10 units eg 60,70,80,…. 2. Number Is used to determine the diameter D0 of tip, For example, for 10 diameter will be 10/100 = 0.1mm 3. Working blade shall begin at tip designated site D0 and shall extend exactly 16 mm up to the shaft terminating at designated site D16

7. 4. The diameter D16 can be calculated as, D16=D0+0.32 for example no .20 reamer shall have diameter of 0.20+0.32= 0.52 mm , so D16= 0.52mm 5 . Tip angle of instrument should be 75 + 35 degree 6. Instrument sizes should increase by 0.05 mm at D0 between numbers 10 and 60 example 10,15, 20 and then should increase by 0.1mm from 60 to 150 example 60,70, 80. 7. Number 6 and 10 have been added for increased instrument selection 8. Instrument handles have been colour coded for easier recognition .

8. Color codes for easier recognition