Ashman review Flashcards
what happens at the condyles in the early stages of opening the mouth
pure rotation at the condyles
what happens at the condyles in the late stages of opening the mouth
translation
what do you look for to determine if you have a class 1 occlusion (angles class of occlusion)
in class 1 occlusion the MB cusp of the maxillary 1st molar should rest in the MB groove of the mandibular 1st molar
What is the position of the condyles when you are in CR (centric realtion)
they are UNRESTRAINED in the superior posterior part of the glenoid fossa
is CR a cuspal relationship
no, it is a skeletal position and is totally independent of tooth contacts
what is CO (centric occlusion)
maximum intercuspation
concerning posselts envelope of motion, when do you have the smallest vertical dimension
when you are in CO
concerning posselts envelope of motion, what happens to your vertical dimension when you move from CO in a protrusive motion
your vertical dimension increases
concerning posselts envelope of motion, what happens to your vertical dimension when you move from CO in a retrusive motion
your vertical dimension increases
what is the curve of spee
the anterior to posterior curve of the teeth seen from the sagittal plane
what is the curve of wilson
the right to left curve of the teeth seen from the frontal plane
what is a combination of the curve of spee and curve of wlison
the sphere of monson (said you could put an 8” diameter ball on the mandible and it would touch each cusp tip)
what is christensens phenomenon
the fact that when you do a protrusive movement, your incisors remain in contact but your posterior teeth separate from each other.
what causes christensens phenomenon
the angle of the articular eminence of the temporal bone. when the condyle translates out of the glenoid fossa it goes down along the articular eminence. this depression causes the gap between posterior teeth
the larger the gap between the posterior teeth in a protrusive movement, the _____ the angle of the articular eminence
steeper
what are other names for the bennett movement
lateral side shift
lateral mandibular translation
in a bennett movement what happens with the condyle on the working side
the working side condyle rotates (eventually it will also translate)
in a bennett movement what happens with the condyle on the non-working side
it translates
there will be a picture of the articulators analog of the medial wall of the glenoid fossa, what is the angle of that wall associated with
the bennett angle
what on the articulator is the analog of the condyle
the brass ball
what is the brass ball of the articulator the analog of
the condyle
before putting the alginate impression and tray into the mouth of a patient, what must you check for in their mouth
tori
should you make sure that a patient doesn’t have stuff in their teeth before taking an alginate impression
yes
what do you do with your impressions if you have a patient with heavy calculus
take an impression with the calculus, and take one after the calculus has been removed to show the patient the difference
What is the formula for gypsum you need to know
CaSO4*1/2H2O + 1.5H2O –> CaSO4 * 2H2O + heat
I think its the only option with CaSO4
what are some various uses of gypsum products
- used as the investment in lost wax products
- plaster for impressions for a complete denture
- make casts
(not flexable)
what do you need to remember about taking alginate impressions out of a patients mouth
You need to SNAP it out quickly, if you don’t it can mess with the modulus of elasticity (make it less accurate)
what should you have the patient do when you are removing an alginate impression from their mouth
relax with their mouth half open
what can you do to increase the setting time of your alginate
use cold water
what are the 4 primary muscles of mastication
masseter
temporalis
lateral pterygoid
medial pterygoid
which muscle is the only depressor of the mandible
the lateral pterygoid
which muscles elevate the mandible
masseter
temporalis
medial pterygoid
where do you put the excess alginate you have mixed
in the trash, not the sink
is alginate reversable or irreversable hydrocolloid
irreversable hydrocolloid
what type of reaction is the alginate reaction
chemical
(picture or the T-bar) what is the T-bar used for
to hold up the bite fork when you are setting up your maxillary cast for mounting
what type of joint is the TMJ
a giglymoarthroidal joint
what is a ginglymoarthroidal joint
a joint that both glides/slides, and rotates
are crowns made on small articulators, or on articulators that are closer to the size of the patients skull more accurate
those that are larger are more accurate (you will have to make less adjustments on crowns made on larger articulators than those made on small articulators)
what happens with the disk of the TMJ in a healthy TMJ when the mouth opens widely
it pulls foreward with the condyle, and stays between it and the articular eminence
what is the #1 goal is restorative dentistry
not to introduce any interferences into the patients mouth
what are the possible outcomes if there are interferences put into a patients mouth
small interferences - the patient may adapt
larger ones - the patient will not adapt and this will cause problems if not corrected
why do we use the articulator when doing restorative dentistry
so that we have fewer and smaller interferences
what bite record do you need to set the condylar guidance angle
the protrusive bite record
what happens to your alginate if you have a high guluronate to mannuronate ratio
it will be strong and brittle
what happens to your alginate if you have a high mannuronate to guluronate ratio
it will be weak and elastic
