Occlusion and Restorative Dentistry 2 Flashcards
What can be used to mark tooth contacts?
Millers Forceps
Fine articulating paper
When should tooth contacts be marked?
Before preparing a tooth or removing a restoration
After placing a crown or a restoration
What are functional cusps?
Cusps that occlude with the opposing teeth in ICP
The palatal cusps of the upper posterior teeth and the buccal cusps of the lower posterior teeth
What are non functional cusps?
Cusps that do not occlude with the opposing teeth in ICP
The buccal cusps of the upper posterior teeth and the lingual cusps of the lower posterior teeth
What are fossa?
Depression or concavity on the tooth surface
Functional cusp of a tooth contacts the fossa of the opposing tooth
What are the ICP contacts?
The palatal cusp of an upper molar contacts the fossa of a lower molar
The buccal cusp of a lower molar contacts the fossa of an upper molar
What is overbite?
Vertical overlap of the incisors
What is overjet?
Relationship between the upper and lowe teeth in a horizontal plane
What is crossbite?
Where one or more teeth may be abnormally malpositioned buccally, lingually, or labially with reference to opposing teeth
What is an anterior open bite?
Lack of vertical overlap of anterior teeth when posterior teeth are in full occlusion
What is a posterior/lateral open bite?
Failure of contact between the posterior teeth when the teeth are in full occlusion
What is canine guidance?
When the mandible moves to the working side, there is contact only between the canines
No posterior tooth contacts
Also known as a mutually protected occlusion
Describe a mutually protected occlusion
Gold standard
Canine guidance
Posterior disclusion in lateral excursions
No non-working side/working side contacts
No protrusive interferences
What is group function?
When the mandible moves to the working side, multiple teeth on that side will contact
When is bilateral group function commonly seen?
In toothwear
What is protrusion?
Condyle moves forwards and downwards on articular eminence
Only incisors and/or canines touch
No posterior tooth contacts
What are occlusal interferences?
Un desirable tooth contacts that may produce mandibular deviation during closure to ICP or may hinder smooth passage to and from ICP
What are the types of occlusal interference?
Working side
Non working side
Protrusive
Why should posterior contacts be avoided?
Most teeth are not designed to absorb significant lateral forces generated by occlusal interference
Musculature gets a rest as less activity if not undesirable posterior contacts
Can cause occlusal trauma and undesirable tooth movements
What is eccentric bruxism?
The parafunctional grinding of teeth
An oral habit consisting of involuntary occluding teeth movements other than chewing that may lead to occlusal trauma
What is centric bruxism?
Clenching
The pressing and clamping of the jaws and teeth together
What are the signs and symptoms of bruxism?
Tooth wear
Fractured restorations
Tooth migration
Tooth mobility
Muscle pain
Headache
Earache
Pain and stiffness of TMJ and surrounding muscles
What are the factors of toothwear?
Abrasion
Attrition
Erosion
Abfraction
What is occlusal trauma?
Injury resulting in tissue changes within the attachment apparatus, including PDL, supporting alveolar bone and cementum as a result of occlusal force(s)
What are the different types of occlusal trauma?
Primary - intact periodontium
Secondary - reduced periodontium
Fremitus - palpable or visible movement of a tooth when subjected to occlusal forces
What is the examination checklist for occlusion?
Incisor relationship
Guidance
Overjet/overbite
ICP contacts
Working/nonworking/protrusive contacts
Pathology
