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Human Factors of XR: Using Human Factors to Design XR Systems
Deep bite /certified fixed orthodontic courses by Indian dental academy
1. THE DEEP BITE- AN
ORTHODONTIC ENIGMA
INDIAN DENTAL ACADEMY
Leader in continuing dental education
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2. THE DEEP BITE- AN ORTHODONTIC
ENIGMA
Bite opening a challenge
Careful diagnosis and planning
Biomechanical considerations
Increasing emphasis on adult orthodontics
Continuous arch mechanics may be
frustrating!
Requires a careful strategy
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3. THE DEEP BITE- AN ORTHODONTIC
ENIGMA
In growing patients –
Not advisable to intrude lower incisors
Move posterior teeth to the level of
incisors
Incisor intrusion will affect vertical
molar position affect facial aesthetics
Depending on the severity upright
molar/premolar segments or premolars
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4. THE DEEP BITE- AN ORTHODONTIC
ENIGMA
In Adults
Molar extrusion changes LAFH
Not an advisable clinical procedure !!
Incisor intrusion – a carefully planned
solution
An appropriate interincisal angle to
prevent relapse
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5. GENERAL PRINCIPLES
Dissociate forces from moments,
single point contact.
Selection of point of force application
and center of resistance of teeth to be
intruded
Control of posterior segment and reactive
units
Check anterior tooth geometry
Extrude molars only in specific situations
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6. Reverse curve of spee
Ant teeth have nowhere to go except
crown labial ,root lingual
Round trip !!
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7. Curve of Spee !!
Only moments no net intrusive force
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8. 2 couple system /indeterminate/minimal
Intrusive force
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9. Can you open a bite with a utility arch ?
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10. One couple system,Off center V bend
Extrusion in the shorter arm ,
Dissociation of moment and force
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13. Precise force of 60 gms
One point contact essential
Precision essential to contain negative
effects
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14. For 2 central incisors-Cres on line
parallel to mid sag plane pt on
distal half of cuspid
For 4 incisors – Cres projected
line perpendicular to occlusal plane
between canines and 1st bicuspids
For 6 anteriors- Cres
perpendicular to occlusal plane
distal to 1st bicuspid
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15. THREE PIECE INTRUSION ARCH
017x025 anterior segment in ss
extension distal to lateral incisors
tip back springs or cantilevers in 017
x025 tma calibrated for precise force
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16. BIOMECHANICS-A REVIEW OF CONCEPTS
Couple- pair of equal and opposite
forces that produce a tendency for
rotation called a moment
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17. BIOMECHANICS-A REVIEW OF CONCEPTS
Tooth movement is a net resultant of the
equilibrium forces. The equilibrium is
cognitive,not obvious and a source of surprise
Tooth movement!!
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