Occlusion

Question 1

Verical Dimension of Rest

Answer 1

• Dist btw nose and chin
• Elevator and depressor muscles are in equilibrium
• Usually 3 mm bte PM

Question 2

Vertical Dimension of Occlusion

Answer 2

• Distance btw nose and chin when biting
• Indicates superior-inferior relationship of max and mand at MI

Question 3

Interocclusal Space

Answer 3

• Diff btw VDO and VDR
• VDO + 3mm=VDR

Question 4

Excessive VDO

Answer 4

• Excessive display of mand teeth
• Muscles of mastication fatigue (closing muscles)
• CLicking of posterior teeth
• Strained Lips

Question 5

CR Record

Answer 5

• Provides ability to adjust VDO in articulator by establishing a radius of the mandibles arc of closure
• Facebow used to transfer hinge axis

Question 6

Protrusive Record

Answer 6

• Registers the anterior-inferior condyle path in the translation movement of condyles
• Christensens Phenomenon- the distal space created btw max and mand occlusal surfaces when mand is protruded due to down and foward movements of condyles

Question 7

Plane of Occlusion

2 lines

record

Answer 7

• Campers line- from ala of nose to tragus of ear
• Interpupillary line
• Max occlusal rim should be parallel to these
• Recorded with FoxPlane

Question 8

Balanced Occlusion

creates

avoid

cusps touch

Answer 8

• Tripodization- simultaneous anterior and bilateral posterior contacts in centric and eccentric movements
• Anterior guidance should be avoided to prevent dislodging
• Balancing side
  
  • Max L cusp–> L incline Mand B cusp
• Working side
  
  • Max L cusp–> F incline Mand L cusp
  • Mand B cusp–> L incline Max B cusp

Question 9

Lingualized Occlusion

Answer 9

• Only palatal cusps of max post contact mand post
• Eliminating destabilizing buccal force vectors

Question 10

Bennett Measurements

3

Answer 10

• Ben angle (15)
  
  • angle obtained after nonworking side condyle has moved anteriorly and medially relative to sagital plane
• Ben Shift
  
  • Lateral movement of mand toward the working side during lateral extension
• Ben Movements
  
  • Lateral movement of both condyles toward working side

Question 11

Determinants that favor disclusion

Ant

Post

Cusp

Tooth arangement

Occ plane

Answer 11

• Post teeth seperate quickly, and occlude quickly
• Ant guidance
  
  • Horizontal- steep incisal guid
  • Lateral- steep canine guidance
• Post guidance
  
  • Horizontal- steep Horizontal Condylar Inclination
  • Lateral Less Bennett movements-side shift
• Cuspal- Short with shallow inclines
• Tooth arangement-
  
  • Less curve of Spee and Wilson(flat occ)
• Orientation of occlusal plane
  
  • Less parallel to condylar path

Question 12

Compensating Curves

Answer 12

• Curve of spee
  
  • antpost curve to ensure loading into log axis
  • Teeth are mesially inclined as you move distally
• Curve of WIlson
  
  • Mediolateral curve along posterior cusp tips to ensure loading on long axis
  • Teeth are lingually inclined as you move distally