quiz 3 Flashcards
Occlusion and articulation in complete dentures
occlusion describes the contact in static relationship.
Articulation describes contact between teeth as they move.
5 goals of complete denture occlusion
enhance stability, enhance mastication, esthetics & speech, preserve remaining structures, decrease lateral forces
what kind of occlusion should be used for people with poor neuromuscular control?
monoplane
when should adjustments with a bur be used?
contacts are in close to proper position. Minor reshaping will improve them
when should you move the teeth in the wax?
it will take alot of time to correct position. Lots of adjustment is required. Tooth is rotated or tilted
What are you goals for centric contacts?
even distribution of posterior teeth, no anterior contacts, 1-2 mm of buccal overjet, even weight darkness with articulating paper.( bulls eye)
how should you remove articulating paper marks?
with dry gauze
what should you adjust before adjusting the excursions?
centric stops
adjusting eccentric cusps includes…..
even distribution of all teeth in excursions, Each mandibular posterior needs at least 1 balancing and working contact, balancing contacts should never be heavier than working contacts
how to mark contacts
mark centric contact and excursive contacts with different colors, Mark both sides simultaneously
should there be contacts on maxillary buccal cusps during excursions?
no
IIF rule
balancing contacts will be on the inner inclines of functional cusps
which arch should be reshaped first?
mandibular
4 steps of occlusal adjustment
- restore Vertical dimention
- refine centric occlusion
- perfect working and balancing occlusion
- correct protrusive occlusion
Red paper, blue paper
red is for centric occlusion, blue eccentric movements
how do you restore vertical dimension?
grind the central fossa. Dont grind the cusps.( only grind cusp if it is high in every excursion)
when do you deepen the fossa?
if the cusp is high in centric occlusion
when do you reduce the cusp?
if the cusp is high in both centric and eccentric positions
the rule of selective grinding states….
centric holding cusps are not ground. These are maxillary lingual and mandibular buccal cusps. These are essential in recording the VDO
which cusps should be reduced then?
BULL , buccal upper , lingual lower (noncentric cusps)
which inclines are reduced if reducing the cusps
lingual inclines of upper buccal, buccal inclines of lower lingal cusps.
if adjustment is needed on anterior teeth where can you do it?
labial surface of lower anterior teeth, palatal surface of upper anteriors
what is carborundum paste milling?
smoothens the various gliding surfaces of the teeth. Its put on the teeth and the articulator is moved in all excursive movements.
midline should be centered to what?
philtrum
during sibilant sound production how many mm are between maxillary and mandibular first premolars?
1-2 mm
where should the mandibular anterior teeth be set?
slightly anterior to ridge
horizontal overlap of posterior teeth should be what?
1.5 mm to avoid cheek biting
where is the buccal corridor?
space between buccal surfaces of posterior teeth and cheeks
maxillary posterior extension
using a transfer applicator mark each pterygomaxillary notch and vibrating line. Put trial denture in and make sure it ends on the line and in the pterygomaxillary notches
how to test phonetics
engage in a conversation with them and observe them.
difficulty producing the F and V sounds
maxillary anterior teeth too far lingually, or occlusal plane to high
Difficulty with S sounds
excessive thickness lingual to maxillary central incisors
S sound sounding like Sh
too broad of a channel lingual to maxillary central incisors preventing contact between the tongue and denture base
difficult with Th sounds
too much horizontal overlap or a deep channel between the tongue and denture base area lingual to the upper incisors
are wax try ins perfect?
no they almost always need to be modified
interocclusal distance should be what?
2-4mm
Changing OVD effects what 2 things
occlusion, facial esthetics
how to check centric relation record
aluwax method, alternate technique
what is the alternate technique?
The use of impresion material get a new centric record. When placed on the articulator the condylar ball should contact the fossae wall. This tells you if you need to remount the cast.
which tooth is the most critical tooth relationship?
canine, if half tooth offset not present, diastema required between anterior and posterior teeth
whats important to check when looking for esthetics while in the mouth?
soft tissue profile, lip support, display of vermilion border, correct nasolabial angle
what causes lisping
non-uniform overjet of anterior teeth, diastemas between teeth, palatal contours, diamond shaped openings between teeth
denture base contours
should not be slightly convex in shape, this affects phonetics
what is the distance between lip closer and teeth touching that you need for correct VDO?
2-3mm
