Intro to occlusion Flashcards
What is occlusion
How the teeth come together and function
What can happen if occlusion is disturbed
Can lead to :
1. Pain
2. Loosening of teeth
3. Fracture of restorations
What can happen if we overload a tooth and make it heavy in occlusion
- Premature contacts
- Increased lateral forces on poster teeth
- Excessive force due to parafunction
What are occlusal interferences?
Interferences when a patent is bitting up and down usually due to a too high restoration
What technique can you use to check you restoration isn’t too high?
Fremitus and articulating paper
What symptoms will a patient experience if you place a restoration that is too high?
- Inflammation
- Pain in the PDL
- Bruising + pain
- Widening of the PDL
- Increased mobility of tooth
Which forces are posterior teeth designed to deal with?
Vertical not horizontal
What symptoms can patents with bruxism experience?
- Increased tooth wear
- Fracture of restorations
- Muscle pain
- Micro cracks
What is the function of the Articular emine?
It guides the mandible forward when you slide you jaw forward
Where is the Articular emine found?
It is found on the glenoid fossa
What is the free way space
The space between the upper and lower teeth at rest
What is the typical value of the freeway space
2-4mm
What does ICP stand for
Inter cusp position
What is the ICP
The position of he mandible when the mandibular and maxillary teeth are maxillary interdigitated
What does RCP stand for
Retruded Contact Position
Name the key muscles involved in closing the mouth
- Temporalis
- Masseter
- Medial pterygoid
- Lateral pterygoid
Name some jaw movements we talk about in dentistry
Protrusion and lateral movements
How does your body prevent horizontal movement form affecting the molars?
Condylar guidance
What is the “working” side
The side your jaw is moving to
What are the 2 terms we use to describe occlusal schemes
Canine guidance vs group function
Describe a patient who is said to have canine guidance
It means only the canines on their working side remain in contact when movies to that side
Describe a patient who is said to have group function
When they move their jaw laterally 2 or more teeth remain in contact on the working side
Why might older patients be in group function rather than canine guidance
Because over time they have worn down their canines due to grinding
What are the problems associated with group functions
Canines come into contact with each other during lateral movement which they don’t like
