5-movements of the mandible
TRANSCRIPT
Movements of the Mandible
Dr. Bistey, Tamásegyetemi adjunktus
Basic knowledge
Axis of the movements
Transversal
Vertical
Sagittal
Prominent points of the movements
Condyle
The centric point of the condyle
Symphysis, point „I”
Contact point of the lower central incisors
Condyle and symphysis points
The used planes
Frontal plane
Horisontal plane
Sagittal plane
Types of the movements
Free movements
Only the soft tissues and joint structure affect the movement and its pathway
Guided movements
The teeth or the prosthesis guide the mandible
Opening-closing
The movement during opening or closing the mouth
Free movement
Parts/phases
Pure hinge movements
Translation
Maximal opening
The transversal axis
Forward and backward movementPropulsion, repulsion
Guided movement
The tooth contact have important role in the pathway modality
Sagittal condyle pathway
Propulsion until incisal bite position
Relation of TMJ and molar teeth
Relation of molar teeth and incisors
Lateral movement
Vertical and sagittal axis
The mandible moves to one of the sides
Two sides:
Working side
Balance side
Tooth contact on working side
Non occlusion (gap) on balance side
The axis
Lateral movement and Bennett angle
Movement in the level of condyles
Christensen phenomena
Sagittal Christensen phenomena
Transversal Christensen phenomena
Edentulous patient
There is a gap at the place of molars/premolars between occlusal rims during propulsion movement
This can also be found in natural dentition
Lateral movement is resulted a gap formation on the balance side at the place of molars/premolars
This can also be found in natural dentition
The clinical importance
The artificial occlusal surface must be in harmony with the morphology of the TMJ and the sagittal pathway of the condyle. Otherwise the mandibular movements will reslt intable dentures during masticatory function.
Bennett movement
The bodily lateral movement or lateral shift of the mandible resulting from the movements of the condyles along the lateral inclines of the mandibular fossae during lateral jaw movement to the direction of the working side
Measured in: mm and ˚
1,5-2,0 mm or 10-15˚
Has several types according to the time order
Preliminary
Immediate side shift
Progressive divided
Symphysis point during movements
Border movements
Examination of the point „I” in three planes
Posselt envelope
Surface of the border movements
Occlusion and articulation of natural dentitionBite forms
Tooth contacts
Guiding surfaces
Guidance of teeth
Changing of occlusion in adults
Occlusal theories
Chewing
Thank you!