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
· Prospective follow up
· Treatment protocol
o Anterior bite ramps, lingual pressure areas, class 2 / vertical elastics, extrusion 1mm of posterior teeth, Lower premolars - rectangular long attachments, Heavy posterior occlusal contacts
· 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 SIGNIFICAN DIFFERENCE
CONCLUSION
1. Aligners as effective at correcting deep bites as labial fixed
2. Aligners are more efficient than labial fixed
IMPROVEMENTS / COMMENTS
· Why did labial fixed cases take 30+ months non-extraction
· Retrospective study, RCT would be more robust
