Occlusion 3 Flashcards
_____ to the teeth are the lips and cheeks that provide _____, but constant ______ directed forces
Labial, relatively light, lingually
The tongue provides ______ and _______ directed forces to the ____ surfaces of the teeth
Labially and buccally, lingual
The forces from the tongue and cheeks/lips oppose each other and allow the teeth to exist in the _______
This is occurs when there is ____ for the tooth within the arch
What is the definition of this space?
Neutral space
Adequate
Neutral space = the position where labiolingual and buccolingual forces are in equilibrium
What factors and forces determine tooth position ?
Musculature, proximal contact, occlusal contact
What causes mesial drifting?
Continuous buccolingual and vertical movements during mastication of teeth overtime results in wear of the proximal areas
Normal arch alignment is maintained in part due to the ____, which is the contact between _______ teeth
Proximal, adjacent
Occlusal contacts prevents the _____ or ______ of teeth, thus maintaining arch ____
Extrusion or supereruption
Arch stability
If a tooth is lost, the distal tooth will likely move _____ and the unopposed tooth with likely _____
Mesially, erupt
How is the buccoocclusal line established?
In a normal arch, this line flows _____ and ______
An imaginary line extended thru all the buccal cusp tips of the mandibular posterior teeth
Smoothly, continuously
How is the linguocclusal line established?
An imaginary line extended through the lingual cusps of maxillary posterior teeth
How is the central fossa line established ?
Where are the proximal contact areas in relation to this line?
A third imaginary line extended through the central developmental grooves of the max and many posterior teeth
Proximal contact areas are placed slightly buccal to the CF line
The max lingual occlusal line aligns with the ______ in MIC
Mand central fossa line
The mand buccolingual occlusal line aligns with ____
Max CF line in MIC
What are supporting cusps?
Cusps of teeth that contact in and support maximal intercupsal position
Which cusps are normally supporting cusps on the mand & max posterior teeth?
Mand = facial
Max = palatial
Non supporting cusps _____ the opposing teeth
What happens if this is lacking?
Overlap
Biting the cheek or tongue
Which cusps are normally non supporting cusps in the mand & max?
Max = buccal
Mand =ling
Mandibular posterior teeth have a tendency to tip their crowns ____ and roots _______
Lingually, laterally
The maxillary posterior teeth keep the crown with a slight ____ inclination and a _______ inclination of the root
Buccal, lingual
From a lateral view, all teeth show a slight ________ inclination
Which tooth is a possible exception?
Medial
Max 3rd molars
Anterior teeth have a slight ____ protrusion and their crowns seem to incline ______
Labial, laterally
*the anterior teeth tip out to the side and toward the front
Overjet can be classifies as _____ overlap
Horizontal
Overbite can be classified as ____ overlap
Vertical
Occlusal contacts occur when the _______ cusps contact the opposing ________
Where do these cusps typically contact (1 or 2 areas)
Centric, central fossa line
Central fossa areas or marginal ridge and embrasure areas
In what type of occlusion does the stamp cusp of one tooth occlude n a single fossa of a single opponent?
Cusp-fossa occlusion
In cusp-fossa occlusion, the upper stamp cusps fit into all the ___ of the lower teeth while the lower stamps cusps fit into all the _____ except the _________of _______
Fossae, upper fossae, distal ones, bicuspids
In which type of occlusion does each tooth occlude with two opposing teeth?
Cusp- embrasure occlusion
What are the advantages of cusp-fossa occlusion?
Fore’s are directed along the long axis of tooth
There is greater stability of entire arch and less tendency towards tooth movement
There is less chance of food impactions between embrasure
In normal interarch tooth relationship, each tooth occludes with _____ opposing teeth
Which teeth do not?
Two
Mand central incisiors and max third molars only occlude with one opposing tooth
Why is it good to have teeth occluding with two opposing teeth?
Helps maintain arch integrity even when a tooth is lost, since stabilization occlusal contacts are still maintained on all remaining teeth
If one or more teeth in the mand arch are located ______ to their max counterparts, the condition that occurs is called _____
Facially, crossbite
What is premature contact?
What other structures are affected if there is premature contact ?
One posterior or anterior teeth hits more than others when the jaw closes
This tooth bears more force and is the premature contact area
Muscles of mastication, TMJ, and offending tooth affected
STUDY PICKET FENCE QUESTIONS FROM POWERPOINT
