Root resorption
Shape of periodontal ligament – middle PDL is the narrowest aspect = biggest risk of hylinisation
When hylinisation occurs
- Necrotic tissue require to be removed
- Done via mono and multinucleated cells- / macropharges. Produce cytoclines which differentiate osteoclasts
- Root resorption occurs around an area of hylinsation
- Time line – after 10 day Brudvik 1995
Incidence of RR
- 90% of all patients show some signs of RR
- 18% greater than 2mm
- 1-5% greater than 1/3 of root
RR at 6 months is correlated to RR at the end of treatment 0.6-0.7
CONCENSOUS MEETING Recommendations
- Take OPG 12 months in treatment
- Extraction treatment has a higher risk of RR
What to do if RR?
- Very little literature
- 2mm+ if detected – discuss with patient objectives
- 3 months no forces for Levander 1993
- Avoid forces to tooth with RR
- Retake radiograph 6/12 after restart
Development of clinical practice guideline for orthodontically induced external root resorption Sondeijker 2020
