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Dental Anatomy
Chp 20 - Occlusion
23
Biology
Undergraduate 3
11/03/2009

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Cards

Term

What is occlusion?

Definition
contact relationship between the maxillary and mandibular teeth when the jaws are in fully closed position.
Term

What are the factors related to occlusion?

Definition
Musculature and neuromuscular patterns. Also TMJ functioning
Term

What does occlusal trauma mean?

Definition
Trauma to the periodontium resulting from occlusal disharmony.
Term

Is there an ideal occlusion?

Definition
138 Occlusal contacts for the permanent dentition of 32 teeth.
Term

What is centric occlusion?

Definition
voluntary position of the dentition that allows the maximum contact when the teeth occlude.
Term

What is the difference between overjet and overbite?

which is greater in male or female?

Definition
Overjet is the amount your teeth stick out horizontally. Overbite is the amount they hang over vertically. Overjet equal in male and female. Overbite more prominent in females.
Term

What are the contact areas of teeth, and why are they important?

Definition
Contact between neighboring teeth. Stabilizes teeth in the dental arch and protects the interdental gingiva.
Term

How is each arch divided when describing arch form?

Definition
3 segments. Anterior teeth premolars and molars
Term

Discuss the five phases of arch development.

Definition
1. permanent first molars erupt. 2. Perm. Anterior Teeth Central then lateral Incisors. 3. phase 3  = Premolars erupt. 4. canines erupt - 2nd molars same time. 5 phase - 3rd molars
Term
Compare the curve of Spee and the curve of Wilson
Definition

Spee - curved alignment of all the teeth.

Wilson - rounding seen from posterior of mandibular jaw.

Term

What is the root axis line, and why is it important?

Definition
Imaginary line representing the long axis of the tooth. Allows for proper spacing between roots for blood and nerve supply. Securing anchorage of the roots in jawbone.
Term

Explain centric stops, supporting cusps, vertical dimension of the face, and the Golden Proportions.

Definition
centric stops or contacts are: height of cusp, marginal ridges, central fossae. 2. Supporting cusps are ones that function during centric occlsion (lingual cusps of max buccal cusps of mand. 3. dividing the face into 3rds. 4. proper function + aesthetics 
Term

What is centric relation, and how does one achieve it in a patient?

Definition
the end point of closure in the mandible. Have complete mandibular retraction
Term

What are premature contacts, and how does one find them in a patient?

Definition
one or more teeth contact before the other teeth. If they slide teeth from side to side in centric relation and it does not equal centric occlusion may be caused by premature contacts
Term

Discuss lateral and protrusive occlusion.

Definition
lateral are when teeth are shifted to one side so that only those canines bare the stress and touch. Protrusive is the same only with the 8 anterior teeth touching.
Term

What is interocclusal clearance and the mandibular rest position?

Definition
rested mandible can measure the distance between occlusions = interocclusal clearance.
Term
What is malocclusion, and what is its impact?
Definition
Failure to have an overall ideal form to the dentition while in centric position. assosiates with occlusal trauma. Impact on appearance. increased periodontal disease
Term

Explain Angle’s classification of malocclusion.

Definition
seperated class 1,2 and 3. malocclusion of molar and canine.
Term

What are the different facial profiles for the different classifications of Angle’s?

Definition
Mesognathic (class 1 normal) , Retrognathic (Class 2 - protruding max) class 2 div 2 is mesognathic profile severe overbite may occur , Prognathic (class 3 - protruding mand)
Term

Discuss the role of the primary occlusion.

Definition
flush terminal plane and mesial step will most likely allow for good occlusion.  distal step does not.
Term

What are parafunctional habits, and what complications can result if they are present?

Definition
movements within the mandible that are not within normal range. gingival recession, attrition, enlarged muscles
Term
What are the skeletal considerations when dealing with malocclusions?
Definition
maxilla and mandible abnormalities. protruding retruding chin, resting lip closure problem, elongation of face
Term

What are the myofunctional considerations in occlusion?

Definition
tongue thrust, sucking habits, open lips, structural problems
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