July 06, 2022

Class 2 Biomechanics with Aligners

4 minutes

Join me for a summary of Dr Bing Fang’s lecture entitled: Biomechanical Research and clinical application of orthopaedic Treatment on Adolescent mandibular retrognathia. It was part of the first International Orthodontic Foundation online symposium, with Ravi Nanda: https://www.iofglobal.org

Intrusion with aligners

Clinical risk of anterior intrusion, can cause retroclination / proclination.

Plan with assessing lower incisor inclination relative to skeletal structure from a cephalogram

To figure out this problem they designed a finite element study to figure out what happens for different lower incisor inclinations

If the IMPA angle exceeded 100 the intrusive force will be in front of CR resulting in a moment causing lingual root torque and buccal crown torque

If the IMPA angle less than 100 the intrusive force will be behind the CR resulting in a moment causing buccal root torque and lingual crown torque

Plan intrusion:

Proclined teeth: intrusion and retraction at the same time with lingual crown torque

Retroclined teeth: Intrusion, with labial crown torque

Advanced Mandibular Spring AMS with aligner

Telescopic arm with spring.

Distalization of posterior and no movement in the anterior along with anterior bit turbos

Class II elastics are used day time, appliance at night

Inserts into connectors which are imbedded into the aligner

How does it work

Finite model analysis, favourable for advancing the mandible – PDL even stress, promote mandibular growth, stress on condylar anterior aspect and posterior glenoid fossa

#alignerorthodontics #class2 #Bingfang #farooqahmed

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By Farooq Ahmed

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