Type of Approach for Biomechanics of Aligner Orthodontics Kenji Ojima. AAO June 2021. Episode 92

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Farooq Ahmed

Type of Approach for Biomechanics of Aligner Orthodontics Kenji Ojima


Integration of data: Ojima JCO 2019

·      Face jpeg

·      CBCT data Dicom

·      STL


Anatomical driven simulation planning, face, crown, root, bone

Precision of degree of intrusion.


Planning approach 

1.     Treatment goal

2.     Biomechanics

3.     Movement simulation


Case 1 AOB case

·      Anterior extrusion STL and Dicom data, can plan amount of extrusion facially and with bone present

·      Molar intrusion: Assess density of bone for mandibular intrusion


Case 2 extraction cases Ojima JCO 2020

·      Missing L5s, retainer LE

·      Use CBCT, assess bone present for retraction of upper/ lower incisors

·      Then plan biomechanics

·      Retraction of upper incisors, unlikely  bodily movement

o   Aligners predictable at intrusion Rossini  2015 SR

§  Solution to biomechanics = intrusion and retraction = increases predictability of anterior retraction without retroclining


Case 3 Extraction of 6s

·      Biomechanics

o   rectangular attachment on 7

o   Optimise attachments on premolars for distalisation



Case 4 Case 2 div 2

·      From CBCT shows limited bone labially, E line ideal

·      Biomechanics

o   Intrusion and torquing of upper incisors, instead of proclination of upper incisors

o   Upper molar distalisation (as unable to procline upper incisors for space requirements)



·      Anatomical digital data

·      Biomechanics

·      Clinchecks

o   Increase predictablilty in tooth movement





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