Summary of the Invisalign European Scientific Symposium, with Dr Alessandro Mario and Dr Dieter Brothag presenting their studies
Alessandro Mario
Aligners resolve deep bites by
- Anterior bite turbos – allow posterior extrusion, and progressively move incisal
- Anterior intrusion
- Pressure areas – force through indentations into the aligner
WHO
- N = 44 with complete OB of 7mm+
- hypodivergient SnGoGn less 25
WHAT DID THEY DO IT
Treatment protocol
- Anterior bite ramps, lingual pressure areas, class 2 / vertical elastics, extrusion 1mm of posterior teeth, Lower premolars – rectangular long attachments, Heavy posterior occlusal contacts
- Prospective
- No overcorrection
WHAT DID THEY FIND
- Overbite corrected in every case 3.5mm
- Average time 11 months. 26 aligners
CONCLUSION
- Aligners effective at correcting deep bites, if posterior extrusion is planned
IMPROVEMENTS / COMMENTS
- Did extrusion occur? – Rossinia 2015 SR stated most difficult movement with aligners?
Changing the paradigm of deepbite treatmentDieter Brothag
WHO
- ·N = 50 with complete OB of 7mm+
- IOTN 3+
WHAT DID THEY DO IT
- Retrospective follow up
- Normal practie protocols for both treatments
- Fixed labial Vs Aligners
- Non-extraction
WHAT DID THEY FIND
Effectiveness – PAR changes
- Labial fixed: 20 – 4
- Invisalign: 18 – 3
NO STATISTICAL DIFFERENCE
Efficiency – duration
- Labial fixed: 30+ months
- Invisalign: 20 months
STATISTICALLY SIGNIFICANT DIFFERENCE
CONCLUSION
1. Aligners as effective at correcting deep bites as labial fixed
2. Aligners are more efficient than labial fixed
IMPROVEMENTS / COMMENTS FROM ME
- Why did labial fixed cases take 30+ months non-extraction
- Retrospective study, RCT would be more robust
