Posslet Envelope of Movement Flashcards
Who created the envelope of movement in 1952?
Ulf Posslet
Where is posslet from?
Sweden
T/F: habitual movements do not generally coincide with border movements
True
Do habitual or border movements show greater variability in individuals?
habitual
T/F: The rest positions and intercuspal position generally differ from the retruded position of the mandible
True
describes the position of “best fit” between the upper and lower teeth. ◼It is the closest relationship of the mandible to the maxilla as this is where all the teeth fully interlock simultaneously.
Intercuspal position (ICP)/ MIP
What determines the Intercuspal position (ICP)?
Teeth and soft tissues
T/F: Though it may seem automatic that an individual goes from a rest position to ICP, this path of closure is actually a learnt behavior that is conditioned into short term memory
True
Does ICP give any info on TMJ?
No
Does ICP usually coincide with CR?
No
Usually during MIP, where are the condyles positioned in comparison to CR?
Anterior and inferior
Which position is used clinically for minimal restorations?
MIP
What are the 3 things mentioned that would cause the need for centric relation over MIP clinically?
Excessive wear, TMJ issues, and muscle pain
The position of the mandible in which the condyles are in the most superior and anterior position in the articular fossae, resting against the posterior slopes of the articular eminences with the articular discs interposed.
Centric relation
Where are the condyles positioned in CR?
Most superior and anterior position
What determines the position in CR?
Condyles
Which position is referred to as the most orthopedically stable position?
CR
Which position is repeatable, reproducible, and recordable?
CR
Which portion of the articular disc are the condyles articulating with?
Intermediate portion (avascular portion)
The mandibular movements are limited by ligaments, the articular surfaces of the TMJ, and the morphology and alignment of the teeth; The outer range of movement is reproducible and called ______ movements
Border movements
_____ movements Occur during functional activity of the mandible, Are confined within the Border Movements, and Begin and end in the maximum intercuspation position
Functional movements
This pure rotational movement in the inferior cavity of TMJ is also referred to as ____ movement and the axis is referred to as _______ axis.
hinge movement; terminal hinge axis
This represents the movement from maximum opening to maximum protrusion; sagittal plane
Anterior opening border movement
Superior border movements are determined by the characteristics of
the occluding teeth.
Throughout this entire movement tooth contact is present
Superior contact border movement
The initial tooth contact of Superior contact border movement occurs between the _____ inclines of the maxillary teeth and the _____ inclines of the mandibular teeth.
mesial; distal
The average distance between CR-MIP in 90% of the population is _____
1.25 +/- 1mm
Where does the superior contact border movement begin?
Centric relation
Normal contact in the superior contact border movement will result in what teeth initially contacting?
Posterior 2nd molar
The mandible moves forward from MIP to edge to edge. This is determined by the ______ surfaces of the maxillary anterior teeth.
lingual surfaces
From edge to edge the mandible can move further ______ for the width of the incisal edges.
horizontally
Continued forward movement of the mandible, with the anterior teeth in contact, results in superior movement guided by the _______ of mandibular anterior teeth.
lingual surfaces
Continued forward movement of the mandible is guided by the ____ teeth until the mandible reaches maximum protrusion.
posterior teeth
habitual position of the mandible when the patient is resting comfortably in the upright position and the condyles are in a neutral unstrained position in the glenoid fossae. In this position there is an equilibrium between the forces acting on the mandible.
Postural position (PP)
In the _____ position the muscles are not totally relaxed. There is a degree of electromyographic activity. This position is determined by the muscles and the forces of gravity. IT DOES NOT GIVE US ANY INFORMATION ABOUT THE CONDYLES OR THE TEETH
Postural position (PP)
The condyles are usually _____ and ______ in postural position compared to their CR position.
anteriorly and inferiorly
In this position, the teeth are apart and there is a wedge space between the teeth.
Postural position (PP)
the teeth are apart and there is a wedge space between the teeth called _____
Interocclusal space
What is the interocclusal space in PP between the incisors?
2-3mm
What is the interocclusal space in PP between the premolars?
2mm
What is the interocclusal space in PP between the molar?
3/4-1mm
Postural position (PP) is located some ____ below the intercuspal position (ICP)
2-4 mm
The postural position Clinically is used to determined the _______ in edentulous patients or in patients with severely worn dentition
Occlusal Vertical Dimension (OVD)
The ______ is the distance measured between two points when the occluding members are in contact.
Occlusal Vertical Dimension
The Vertical Dimension at Rest (in the physiological rest position) is usually ____ greater than the Occlusal Vertical Dimension.
2-3 mm
The _____ is the space between the occlusal surfaces of the teeth when the mandible is at rest and the muscles in a state of minimum contraction
freeway space
The chewing stroke starts at the MIP and drops ____ and _____ to the position of desired opening.
downwards and forwards
The chewing stroke starts at the MIP and drops downwards and forwards to the position of desired opening. It returns in a straighter pathway slightly ____
posterior
Which plane is the movement of the mandible in a rhomboid-shaped pattern?
Horizontal plane
Contraction of the right inferior lateral pterygoid causes the right condyle to move ______ and ______
anteriorly and medially
The outer range of movement is greater in the ____ stages of mastication.
early
The outer range of movement is smaller in the ____ stages of mastication
late
The further the mandible opens, the _____ the rhomboids of the horizontal plane gets
Smaller
Which plane produces a shield-shaped pattern?
Frontal plane
The _____ superior border from frontal plane: From MIP the mandible moves to the Left.The path is determined primarily by the morphology and interarch relationship of the teeth.The maximum lateral border position is determined by the ligaments of the rotating condyle.
Left lateral superior border
The ________ is 3D; Combination of border movements in all 3 planes: a.sagittal, b.horizontal, c.frontal; differs from person to person but it has the same characteristic shape
Envelope of motion
The ____ surface of the envelope is determined by the tooth contacts
superior surface
Besides the superior surface of the envelope, The other borders are primarily determined by the _____ and ____
TMJ anatomy and the ligaments
