“Ideal Occlusion; Mutually Protected Occlusion”

Question 1

When are MIP and CR coincident?

Answer 1

when the teeth meet in MIP, the condyles are in the CR position

Question 2

What is the ideal occlusion also called mutually protected occlusion?

Answer 2

⚫ MIP and CR are coincident
⚫ The patient has multiple, bilateral, even and simultaneous contacts in MIP/CR.
⚫ The patient has “light occlusal contacts” on the anterior teeth in MIP/CR.
⚫ The patients has anterior guidance in protrusion and lateral excursive movements

Question 3

What are the four types of occlusal interferences?

Answer 3

⚫ Centric Interferences
⚫ Working side Interferences
⚫ Non-Working side Interferences
⚫ Protrusive Interferences

Question 4

What is an occlusal interference?

Answer 4

an unwanted or premature interocclusal contact

Question 5

What is a premature contact or centric interference?

Answer 5

• when the condyles are manipulated into CR
• one or maybe two teeth contact

Question 6

What is another work for the premature contact?

Answer 6

centric interference

Question 7

What teeth does centric interference occur on?

Answer 7

the mesial inclines of the maxillary teeth and distal inclines of the mandibular teeth

Question 8

The anterior guidance (canine guidance) during lateral excursion happens on which side: working or nonworking?

Answer 8

working side

Question 9

No other teeth on the working or non-working side shoudl contact besides the ______ during a lateral excursion?

Answer 9

canine

Question 10

Where does the working side interference occur?

Answer 10

Occur between maxillary and mandibular posterior teeth on the working side as the patient makes a lateral movement.

Question 11

What can happen if the working side interferences are too heavy?

Answer 11

disclude the anterior teeth and interfere with the smooth harmonious movement of the NWS condyle

Question 12

What is a non-working side interference?

Answer 12

Any contact between the maxillary and mandibular teeth on the non-working side (side opposite to which the mandible moves) as the patient makes a lateral movement.

Question 13

What is the most destructive type of all interferences?

Answer 13

non-working side interferences

Question 14

On what inclines do non-working side interferences occur?

Answer 14

On the NW side between the inner inclines of the maxillary lingual cusps and the inner inclines of the mandibular buccal cusps

Question 15

On what inclines do the working side interferences occur?

Answer 15

• Between the outer incline of the mandibular buccal cusp and the inner inclines of the maxillary buccal cusp
  and /or
• Between the outer inclines of the maxillary lingual cusps and the inner inclines of the mandibular lingual cusps

Question 16

What are protrusive interferences?

Answer 16

Any contact between the posterior teeth as the mandible moves forward in protrusion

Question 17

What can happen if protrusive interferences are very severe?

Answer 17

it could prevent contact of the anterior teeth

Question 18

Why are protrusive interferences so destructive?

Answer 18

they are positioned close to the fulcrum (TMJs) and the power from the muscles is large and destructive forces

Question 19

On which inclines do protrusive interferences occur?

Answer 19

Between the mesial inclines of the mandibular cusps and the distal inclines of the maxillary teeth (posterior)