Factors of Occlusion III Flashcards
Mandibular Border Movements – Pouselt’s Envelope of Motion
! Reproducible movements representing the extreme limits of the mandibular movement governed by the anatomy/physiology of the teeth, TMJ and associated structures
! Pouselt’s Envelope of Motion:
! Frontal – ____ shaped
! Saggital – ____shaped
shield
wedge
Mandibular Border Movements – Pouselt’s Envelope of Motion
! 1-4: \_\_\_\_ (retruded contact to MIP (“centric slip”) ! 4-5: \_\_\_\_ movement to edge to edge Y ! 5-6: Reverse \_\_\_\_ overlap ! 6-7: Most \_\_\_\_ ! 7-3: Motion to \_\_\_\_ ! 3-2 Translation of \_\_\_\_ ! 2-1 Rotation of \_\_\_\_ to CR ! Roof Envelope #4-#7: \_\_\_\_ Movements ! Y: Most extreme R and L lateral movements
CR protrusive incisal protrusive maximum opening condyle condyle tooth determined
Infra-border Movements/Habitual Movements
! Movements within the borders of movement (infraborder movements)
! Z: ____
! X: ____
! 8: ____ arc of closure
! NOT ____ or ____
rest/”postural position”
chewing
habitual
definitive
reproducible
Condylar Movements During Lateral Border Movements
! When the mandible moves into lateral excursive movements:
! Working side: condyle ____ and moves ____ towards working direction
! Bennett ____
! Non working side condyle ____, ____ and moves ____ toward the working side
! Bennett ____
rotates
laterally
movement
rotates
translates
medially
angle
Fixed Factors of Occlusion
Factors that cannot be altered with therapy:
! Skeletal and dental harmony of the jaws
! ____
! Condylar Guidance (angle of the eminence)
! ____
• Fixed Factors of Occlusion
• Centric Relation: is the skeletal position / cannot be changed
• ____ is the guidance of the condyle going down in
the eminence
• Bennet Movement/Angle
• on the working side, it is rotating and moves a little towards the right
• on the left side, it rotates/translates and moves towards medially
• ◦ Bennet angle is moving on the ____
centric relation
bennett movement/bennett angle
condylar guidance
non-working side
Semi-Fixed Factors of Occlusion
Factors that have the potential to be altered with therapy by manipulation:
! ____
! VDO, OVD
! ____
• Rest position ◦Therapy w/ \_\_\_\_ • VDO, OVD ◦measurement from the bottom of the nose to the bottom of the chin ◦can increase by restoring worn teeth with \_\_\_\_ ◦would NEVER \_\_\_\_ it • The Freeway Space ◦the opening between the teeth
rest position/”postural position”
freeway space
occlusal mouth guard
crowns
reduce
Factors that may be altered with therapy:
! Plane of Occlusion
• can restore w/____ on worn down teeth
! Curve of Spee
curvature of the ____ arch
• If there is super-eruption of the teeth the Curve of Spree would ____
• Inverted Curve of Spee:
◦ consider the teeth closed
◦ if the ____ teeth is gone & the ____ teeth super-erupt
! Curve of Wilson
-doesn’t take into account the ____ teeth
• takes into account the ____ and the ____ (usually in the maxillary arch)
• ____ teeth can change the Curve of Wilson
crowns
maxillary
increase
maxillary
mandibular
anterior
buccal cusps
lingual cusps
moved/rotated
Variable Factors of Occlusion
Factors that may be altered with therapy:
! Incisal Guidance/Anterior Guidance
! Overbite – Vertical Overlap
Overbite: the anterior teeth in the maxillary overlap the anterior mandibular teeth (measured ____)
! Overjet – Horizontal Overlap
Overjet: buck teeth
• horizontal overlap - how much are the max. ant. teeth overlapping the mand. ant. teeth
◦ measured by the ____ to where it touches on the facial surface of the ____
◦ in MIC / MIP
! Functional Overjet
Functional Overjet
• measuring the ____ of the mandibular incisal edge
• ____ starting on the incisal edge going down on the facial surface
vertically
maxillary incisal edge
mandibular incisor
functional outer aspect
1-1.5mm
Classifications of Occlusion - Class I
Class I:
Class 1 - the traditional “perfect’ occlusion
• The ____ of the maxillary 1st molar is sitting just mesial to the ____ on the mandibular 1st molar
mesial buccal cusp
groove
Classifications of Occlusion - Class II
Class II, Division:
Class II, Division II
Class II
• the mesial buccal cusp of maxillary 1st molar is ____ to the groove
◦ Division I - traditional ____ syndrome
‣ ____ placed in an anterior position
◦ Division II
‣ the molar relationship is the same (Class II)
‣ the anterior teeth come ____
mesial
“buck tooth”
horizontally
inward
Classifications of Occlusion - Class III
Class III; Class III - "bull dog" • \_\_\_\_ • the mandibular arch is \_\_\_\_ ◦ the mesial buccal cusp of Max M1 is \_\_\_\_ to the groove • \_\_\_\_ not in the correct place ◦ Early treatment is \_\_\_\_ ‣ left pic = kind of like a reverse overjet ‣ right pic = anterior open bite
underbite forward distal functional cusps palatal expanders
Anterior Guidance: Effective vs Ineffective
Class I Anterior Guidance:
! Class I = ____
! May be altered with ____:
effective
therapy
Anterior Guidance: Effective vs Ineffective Class II Anterior Guidance: ! Class II; Div I = \_\_\_\_ - After \_\_\_\_, may be effective ! May be altered with \_\_\_\_:
initially ineffective
protrusion
therapy
Anterior Guidance: Effective vs Ineffective
Class II Anterior Guidance:
! Class II; Div II = ____
! May be altered with ____:
- Only one that could be ____ anterior guidance
- Initially it is called an initially ineffective guidance but after ____ of lower jaw it could be effective
initially effective
therapy
initially effective
protrusion
Anterior Guidance: Effective vs Ineffective
Class III Anterior Guidance:
! Class III = ____
! May be altered with ____:
initially ineffective
therapy
