Occlusion 2 Flashcards
2 ways to examine occlusion
- Dynamic occlusion
- Canine guidance - Static occlusion
Why do we use 2 colours of articulating paper?
1 to mark static contact in the ICP
1 to mark dynamic contacts when in excursive positions
What instruments do we need to mark tooth contacts? (2)
- Millers forceps
2. Fine articulating paper
When should we mark tooth contacts? (4)
BEFORE
- Preparing a tooth
- Removing a restoration
AFTER
- Placement of a crown
- Placement of a restoration
What does the static occlusion include (7)
- Incisor relationship
- Molar relationship
- OJ/OB
- Xbites
- Open bites
- Individual tooth contacts
- RCP-ICP slide
What are functional cusps?
Cusps that occlude with the opposing teeth in ICP
What are non-functional cusps?
Cusps that do not occlude with the opposing teeth in ICP
How do we check ICP contacts?
Tap teeth together
Whats the name for the incisor relationship?
Angles classification
Class I - normal
Class II div I - OJ increased
Class II div II - OB increased
Class III - Reverse OJ
In what incisal relationsip is an OB most pronounced?
Class II div II
Define a crossbite
Condition where one or more teeth may be abnormally malpositioned buccally/lingually or labially with reference to opposing teeth
Define canine guidance (3)
- Mandible moves to left for example so working side
- Contact only between the canines
- No posterior tooth contacts (a space)
This is whats known as a mutually protected occlusion
Define grouped function (2)
- Mandible moves to the left (working side)
- Multiple teeth in contact on the left
Give an example of a problem in dynamic occlusion
Occlusal interference
- Undesirable tooth contacts that may produce mandibular deviation during closure to ICP or may hinder smooth passage to and from ICP
What are the different types of occlusal interference we may see? (3)
- Working side
- Non working side
- Protrusive interference
- Any posterior contact during protrusion
What are the 2 types of bruxism?
- Eccentric
- Grinding - Centric
- Clenching
What are some clinical signs of bruxism? (4)
- Toothwear
- Fractured restorations
- Tooth migration
- Tooth mobility
What are some symptoms of bruxism? (4)
- Muscle pain + fatigue
- Headache
- Earache
- Pain + stiffness in the TMJ + surrounding muscles
What are the different types of toothwear? (4)
- Abrasion
- Attrition
- Erosion
- Abfraction
Define occlusal trauma
Injury resulting in tissue changes within the attachment apparatus, including:
- Supporting alveolar bone + cementum
Classification of occlusal trauma
- PRIMARY
- Intact periodontium
- No perio disease but we still see movement due to occlusal trauma - SECONDARY
- Reduced periodontium
- Due to perio disease + we get movement due to occlusal trauma - FREMITUS
- Palpable/visible movement of a tooth when subjected to occlusal forces
Examination checklist for checking occlusion (6)
- Incisor relationship
- Guidance
- OJ/OB
- ICP contacts
- Working/non working/protrusive contacts
- Pathology
