Dynamic Occlusion

Question 1

What 3 dimensions can the jaw move in

Answer 1

Sagittal, horizontal, frontal

Question 2

Cuspid Rise (Canine Guidance)

Answer 2

Mutually protected occlusion During eccentric movements, cuspids contact causing discclusion of the posterior teeth. Preventing non-functional cusps from contacting

Question 3

Anterior Guidance

Answer 3

Anterior teeth cause disclusion during protrusive movements. The PDL pf our teeth send feedback to our brain and muscles to prevent too much forve from being applied

Question 4

Movement of mandible to the right…

Answer 4

The right is the working side Left is non-working side, balancing Masseter, temporalis, lateral pterygoid, and medial pterygoid all aid

Question 5

Working Side Condyle

Answer 5

As we move to the right, right becomes working side condyle Working side condyle-rotates in the fossa

Question 6

Non-worikng side condyle

Answer 6

Translates out of the fossa down the articular emminences and moves medially

Question 7

Side Shift (Bennet Shift)

Answer 7

Due to the balancing side condyle translating down the eminence and moving medially, it results in a side shift of both condyles medially

Question 8

Bilateral Balanced Occlusion

Answer 8

Group function of both sides of the mouth in all lateral excursive moments. Used only for denture occlusion, allows all teeth to contact at the same time in all excursive movements

Question 9

Unilaterally Balanced Occlusion or Group Function

Answer 9

Contact on multiple posterior teeth gliding on non functional cusps during excursive movements on the working side only

Question 10

What causes interference in mutually protected occlusion

Answer 10

If we do not have sufficient

• Anterior guidance
• Cuspid rise
• Malpositioned teeth

Lead to interferences as we move our jaw into eccentric positions

Question 11

What 2 types of protrusive interferences are there?

Answer 11

• Distal inclines of Max lingual cusps against mesial inclines of Mand fossae and marginal ridges
• Mesial inclines of the mand buccal cusps against distal inclines of Max fossae and marginal ridges

Question 12

What can happen due to interferences?

Answer 12

• Accelerated tooth wear
• Muscles may try to compensate causing muscle pain
• TMJ pain
• Fractured cusps and restoration

Question 13

How has the anatomy of teeth developed to prevent these interferences?

Answer 13

• Cusps pass through grooves or embrasures to avid undesirable contacts
• Approprite cuspid guidance or group function
  
  • Helps seperate teeth enough to allow posterior cusps to pass and not interfere
• We need to restore teeth to correct anatomy to ensure interference doesnt occur

Question 14

Protrusive movements

Answer 14

• Madible is shifted directly forward
• Functional cusps pass through the central grooves of opposing teeth
• Condyles move forward and down the condylar eminence

Question 15

Retrusive movements

Answer 15

• Little movement, restricted by ligaments
• Potential contact in retrusive
  
  • Mand buccal cusps distal inclines with the mesial inclines of the Max fossa and ridges
• Condyle moves upward and backward in the retrusive

Question 16

Leterotrusive Movements

Answer 16

Mandible moves left

Left side is now the working side

Right is non working/balancing

May be called Eccentric movements

Means any movement that takes you out of centric occlusion

Question 17

Favorable working side contacts in laterotrusive movements

Answer 17

• Max teeth inner inclines of BUCCAL cusps contact
• Mand BUCCAL cusps inner incline
  
  • Buccal to buccal
• These are present in a Group function Occlusion (AKA Unilaterally Balanced)

Question 18

Undesireable movements in laterotrusive movements

Answer 18

• Outer inclines of Max lingual cusps with
• Inner inclines of Mand lingual cusps