Lecture 9 Flashcards
What is the approximate cost for six month smiles?
-$3000-4,500
What is the first key to normal occlusion?
-Molar relationship
where should the mesiobuccal cusp of the maxillary first molar be in ideal occlusion?
-In line with the buccal groove on the mandibular first molar
What is the second key to normal occlusion?
-Crown angulation or tip
What is the angle between the long axis of the brown and a line bearing 90 degrees from the occlusal plane?
-Degree of crown tip
T/F Normal occlusion is dependent upon proper distal crown tip, especially of the upper anterior teeth since they have the longest crowns
True
What is the third key to normal occlusion?
-Crown incliniation
What is a plus reading in crown incliniation?
-If the gingival portion of the crown is lingual to the incisal portion
What is the fourth key to normal occlusion?
-Teeth should be free of undesirable rotations
What is the fifth key to normal occlusion?
-Tight contacts
What is the sixth key to normal occlusion?
-Occlusal plane
What should the curve of spee look like?
-Flat to slight curve
What is the ideal overbite that you want a patient to have?
1-2 mm
What is a class I occlusal relationship?
-Triangluar ridge of the mesiobuccal cusp of the maxillary first molar articulates with the buccal groove of the mandibular first molar
Where does the maxillary canine lie in a class I occlusion?
-Between the mandibular canine and first premolar
What is a class II occlusal relationship?
-The mesiobuccal cusp of the maxillary first molar falls approximately between the mandibular first molar and the second premolar
What is a class III occlusal relationship?
-The mesiobuccal cusp of the maxillary first molar falls approximately between the mandibular first molar and second molar
What is class II division 1 relationship?
-Class II molar relationship with protruded maxillary incisors
What is a class II division 2?
-Calss II molar relationship where the maxillary lateral incisors are tipped labially and mesially where the central incisors are typically retruded
When the mandible is proportionally smaller than the maxilla what dental class is formed?
-A class II with a convex profile
When the mandible is relatively greater than the maxilla what dental class is formed?
-Class III relationships with a concave profile
When describing primary molar relationships what teeth do you use?
-Distal aspect of the second primary molars called the terminal plane
What is the normal relationship in the primary dentition?
-Flush terminal plane
What is the maxillary primate space?
-Between the lateral incisors and the canine
WHat is the mandibular primate space?
-Between the canine and the first molar
What are the two types of movement of the mandible?
- Translation
- Rotation
What is it called when the body of the mandible is turning about an axis and can happen in three planes?
-Rotation
What is it called in which all points within a body have identical motion?
-Translation
During translation what muscle moves the condyle articular disk assembly forward?
-Lateral pterygoid muscle
The rotational limit of the mandible is how much?
12 mm of incisors separation
What are mandibular movements limited by?
- TMJ
- Ligaments
- Neuromuscular system
- Teeth
What determines anterior movements of the mandible?
-The teeth
Understanding the function of the anterior teeth and canines and their horizontal and vertical overlap determine what?
-The occlusal form of posterior teeth and their restorations
The more horizontal overlap of the anterior teeth (increased overjet) what must the posterior cusps look like?
-They must be shorter
The more vertical overlap of anterior teeth (Increased overbite) what do the posterior cusps look like?
-They may be taller
A steeply sloped eminence creates a large downward component of condylar movement during lateral and protrusive excrusion and results in what?
-early separation of the posterior teeth allowing for taller posterior cusps
What is it called when the condyles articulate with the thinnest avascular portion of their respective articular disks with the complex in the anterosuperior position?
-Centric Relations
T/F Centric relation is independent of tooth contact
True
Anterior movement of only one condyle will produce what type of movement in the opposite TMJ?
-Reciprocal lateral rotation
If the inclination of the articular eminence is steeper are the posterior cusps taller or shorter?
-Taller
