Define Techniques for Detection Hidden Root Canals
- Three well-angulated periapical films for 3D morphology: o With the cone directed straight on. o Mesiobilque. o And distobilque.
- Obturation materials are seen radiographically as "centered" within the root. N the canal should be centralized in the root that is dentin thickness of the mesial aspect of the canal equal to the distal.
• If the obturation materials appear positioned asymmetrically within the long axis of the root, a missed canal should be suspected
• Computerized digital radiography
1. Expanded access cavities and complete de-roofing
2. Magnification glasses
a. Headloup& headlamps.
3. Transilluminating devices
4. The dental operating
a. Microscope
Detection by prob.. DON'T EVER NEVER DISCOVER EXTRA-CANAL BY BUR.(level of the bur only to the roof .. once you complete the de-roofing stop using the bur don't touch the walls and the pulpal floor and don't use the bur for smoothening or widening of the orifice ).
- Ultrasonic tips: o Their abrasive coatings allow them to send easy dentin when exploring for missed canals N Calcification or shelf of dentin which is called dentin traf are removed by it
- Dyes method: o Methylene blue(or iodine), can be irrigated into the pulp chambers
or by using cotton pellet to moisten the pulpal floor
o Ophthalmic dyes (e.g. fluorescein sodium) with ultraviolet light
it has specific color .. irrigate the pulpal floor with it then wash with normal saline , the extra-canal well absorb the dye and appear darker .
o Frequently the dye will be absorbed into orifices, fins, and isthmus areas (and it will "roadmap" the anatomy)
- Aid in the identification missed canals and fractures lines
• Sodium hypochlorite (NaOCI) N it action is dissolve the organic material and the missed canal is full with tissue (organic) o By means of the "champagne test" providing lot of bubbles. N ( like when you open Pepsi or 7up can )