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)
Conclusion
· Anatomical digital data
· Biomechanics
· Clinchecks
o Increase predictablilty in tooth movement
