Dental Occlusion
Terms
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- What is vertical dimension?
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1) the height of the lower third of the face
2) the distance between the upper and the lower arches - Define articulate (2)
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1) to join together as a joint
2) the relating of contacting surfaces of the teeth in the maxilla and the mandible - Is CR a reproducible position? Define CR:
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Yes.
It is the maxillomandibular relationship in which the: (2002 definition)
1) CONDYLES articulate with the Thinnest portion of their respective disks
2) The disks are in the ANTERIOR/SUPERIOR position against the articular eminences
3) Restricts the patient to purely rotational movement - What are the three general parts of the TMJ?
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1) Upper fixed component
2) Lower movable component
3) An interspersed fibrous disc with associated fibrous and muscular attachments - What is "Freeway space"?
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That is the difference in distance between VDO and VDR
2-4 mm - What are the three main categories of mandibular positions?
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1) MI
2) CR
3) Eccentric positions or movements - Define Protrusive movement:
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The forward or anterior movement of the mandible.
Requires or involves translation of one or both condyles - Define Occlusion (2)
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1) Act or process of closure
2) The STATIC relationship between the incising or masticating surfaces of the teeth - what are the two types of vertical dimension?
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1) Vertical dimension of Occlusion: distance between max and mand when teeth are in MI
2) Vertical Dimension at Rest: Distance between the max and mand when in physiological rest position - What is a dental articulator?
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a mechanical instrument that represents the TMJ and the Upper and lower jaws.
It functions to simulate how the lower jaw moves in relation to the upper jaw - What is lateral protrusive?
- A protrusive movement of the jaw in which there is a lateral component
- Name two basic mandibular movements.
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1) hinge axis movement
2) "Translation" - What happend with the condyle of the non working side?
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1) Shifts medially the same distance .5-1.5 mm
2) moves anteriorly and inferiorly along ARTICULAR EMINENCE
3) Produces the BENNETT angle - What are the four components of the stomatognathic system?
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1) neuro muscular
2) dentition
3) Right TMJ
4) Left TMJ - What is Mediotrusion?
- The movement of the condyle medially (non working side movement)
- What is the max opening in hinge movement?
- 25 mm (measured from incisal edges)
- What is a Bennett angle?
- The angle created between the protrusive pathway and the non-working pathwath of the CONDYLE
- When you combine hinge and translation, how far can you open?
- Average is in the area of 50mm
- What is Laterotrusion?
- Condylar movement ont he working side
- What happens in the condylar region in working side?
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Think about Bennet movement
1) shifts laterally .5-1.5mm
2) Rotates in a posterior direction - What is Centric occlusion:
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Used to refer to MI (Only in ideal occlusion).
It is the occlusion when the mandible is in Centric Relation - What is mutually protected occlusion?
- 1) Anterior teeth protect posterior teeth and vice versa
- What is Centric Relation (CR)?
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A position which is NOT base on Tooth to tooth contact.
Based on anatomical structures of the TMJ
- What discludes the posterior teeth in incisal acts?
- the anterior guidance
- What happens if you have a greater degree of condylar guidance? Lesser?
- The greater/lesser degree of posterior tooth disclusion
- What is physiological rest position?
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PR represents the normally relaxed state of the lower jaw. It hangs open 2-3 mm.
Force of gravity is equal to the neuromascular tonality of muscles of mastication - What is working side movement?
- Lateral movement of the jaw toward the chewing side
- What are non-working side contacts?
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UNDESIRABLE (natural dentition)
Contacts of the teeth on the side opposite toward which the mandible moves in articulation
"Balancing contacts" in full dentures - What are eccentric positions?
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Off center movements or positions.
1) Protrusive
2) Lateral
3) Medial - What is condylar guidance?
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It refers to angulationand curvature of the bony structures of TMJ
These are FIXED - What determines protrusive movement?
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1) condylar guidance
2) anterior guidance - What happens with a greater horizontal overlap (overjet)?
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The further the lower incisors will have to travel before contacting the lingual surfaces of the upper incisors
A later and lesser disclusion of the back teeth - What is MI?
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Maximum intercuspation:
Refers to a TOOTH-TOOTH postion
"Swallow and stay closed" - What is Canine guidance?
- The canines will guide the lateral protrusive movement and DISCLUDE all other teeth and guide the teeth back into occlusion
- What happens with an overbite?
- That is a greater vertical overlap, therefore the greater the amount of disengagement