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What is the success rate for new RCTs?
How do apical lesions respond to conventional RCT?
Apical lesions secondary to endodontic infection respond very well to conventional RCT
What steps make up a conventional (orthograde) RCT?
- 1. Access opening
- 2. Length determination
- 3. Cleaning and shaping
- 4. Root canal filling
- 5. Temporization or restoration
When do fatal errors occur during RCT?
During acess opening. This is directly linked to efficiency
what are the goals of access opening?
- 1. debride the inflamed/necrotic pulpal tissues
- 2. locate all canal orifaces
- 3. achieve straight line access to canals
What kind of instrument do we use to get to the canal?
Use a round bur.
What are the benefits of reduced curvature (provided by proper access)?
Usually around 15 degrees
- 1. reduced chance for ledging, transportation, perforation, file breakage
- 2. enhance instrumentation efficiency (faster cutting)
How do we determine canal length?
- Usually WL is 0.5mm from the radiographic apexApical constriction:physiologic apex
What is a better length determinator than radiographs?
- Apex locator is a more reliable WL measurement
- 1. more accurate physiological apex v. radiographic apex
- 2. potential inflammatory root apex resorption
What constitutes cleaning and shaping of the canal?
- 1. enlarge the root canal space using hand/rotary riles and drills
- 2. remove infected dentinal walls
- 3. make space for the root canal fill using gutta percha
What steps constitute obturation?
- 1. filling root canal radiopaque using gutta percha and root canal sealers
- 2. prevent leakage and re-growth of bacteria and reinfection
What are the steps of a coronal restoration?
- Temporize access area using Intermediate restorative material, Cavit, or Fuji glass ionomer
- temp restoration needs to be replaced within 1-3 weeks
- coronal leakage is one of the main causes of root canal failure