10 final Flashcards
ideal occlusion
-MIP and CR coincident
-pt has multiple, bilateral, even, and -simultaneous contacts in MIP and CR
lighter on ant
-anterior guidance in protrusion and lateral excursive movements
unwanted or premature interocclusal contact
occlusal interference
also called premature contact
-when condyles are manipulated into CR
centric interference
in centric interference, the mandible moves
forward and upwards (and usually slightly laterally) into MIP
where do centric interferences occur
mesial inclines of max teeth and distal inclines of mand teeth
on which inclines do working side interferences occur?
between outer incline of mand buccal cusp and inner inclines of max buccal cusps
outer inner of max lingual and inner incline of mand lingual
what is the difference between group function and working side interferences?
- contacts on the WS that prevent the canines from guiding are WS interferences
- contacts further distal to the MB cusps of first molars are WS interferences
any contact between the maxillary and mand teeth on the nonworking side as the patient makes a lateral movement
non-working side interference
MOST destructive of all interferences. they change the lever system of the mand and place considerable stress on the TMJ joints
non-working side interferences
on which inclines do the non-working interferences occur?
on the inner incline of max lingual cusp and inner incline of mand buccal cusp
any contact between the posterior teeth as the mandible moves forward in protrusion.
sometimes the interference is so severe it will prevent contact between the anterior teeth
protrusive interference
why are protrusive interferences very destructive?
because they are positioned close to the fulcrums (TMJs) and the resulting source of power (muscles) is large and destructive forces
on which inclines do protrusive interferences occur?
(between posterior teeth)
between the mesial inclines of the mand cusps and the distal inclines of max teeth
