1 - VDO Introduction, Jaw Relation Records, Gothic Arch Fabrication Flashcards
jaw relation records are taken during which appointment
appointment 3
what is used to determine where teeth ome together in completely edentulous patients? what cannot be used?
occlusion determined by joint position and anatomical landmarks
MIP can no longer be used
wax rims are adjusted for what
esthetics, phonetics, and function
what is determined intraorally to determine patient VDO
freeway space
CR record is made with ___ and then articulated with ___
wax rims; face bow
natural teeth are suspended into bone by ___ which acts as shock absorber
PDL
denture deeth are part o denture base which rests on what
movable/displaceable tissues
premature, deflective contacts between artificial teeth cause movement of denture resulting in what
damage to supporting tissues
what are the goals of complete deture occlusion
- limit trauma to supporting tissues
- preserve remaining structures
- creaete stability of dentures
- restore esthetics, speech and mastication (function)
what type of occlusion for edenlous pt
bilateral balanced occlusion
what are simultaneous contacting of the maxillar y & mandibular teeth on the right & left in the anterior & posterior occlusal areas when the jaws are in centric or eccentric relations
bilateral balanced occlusion
in order to establish balanced occlusion, we must transfer patient’s maxilla-mandibular relationship to what
semi-adjustable articulator
what records the orientation of the maxilla to the terminal hinge axis
face bow (ear bow)
what provides the same relative opening axis on the articulator as the mandible to the TMJ
terminal hinge axis
what is a hypothetical line thru two mandibular condyles around which the mandible may rotate
hinge axis
what is difficult to determine in edentulous patients and requires special armamentarium (fully adjustable articulator)
true hinge axis
arbitrary hinge axis will place the position how many mm of the true hinge axis
+/- 6 mm
ear bows use what as reference point for arbitrary hinge axis
external auditory meatus
what refers to the length of the face
vertical dimension
what is the distance between 2 points (a fixed point at tip of base of the nose and on the movable mandible, usually chin)
vertical dimension
what is the length of the face when the teeth are separated and the mandible is in physiologic rest position
VDR
is VDR equal to VDO
NO
what is campers plane
bottom of ala of nose to top of tragus
what is interpupillary line
line drawn parallel from right pupil to left pupil
nasolabial angle # averages for men and women
men: 90-95 degree
women: 95-105 degree
how many mm below the lip line should the mx wax rip contour be
102 mm below lip line
should mx wax rim protrude the lip?
NO! should have natural nasolabial angle
should mx wax rime be longer than commissure
no
do male or female show more tooth exposure with relaxed lip
females
do male or female have longer lip and have less visible teeth
males
T/F: the younger the person, the mx anterior teeth are less visible
FALSE! the older the person!
what can be used to verify length of maxillary wax rim
fricative sounds. mx wax rim should contact wet dry line on lower lip with “f” sounds
adjust plane of MX wax rim so that ___ is parallel to campers plane
fox plane/occlusal plane
adjust plane of mx wax rim so that ___ is parallel to interpuppillay line
fox plane/occlusal plane
what is located on mandibular arch and is the terminal end of the denture on the alveolar ridge
retromolar pad
mandibular occlusal plane cannot be above what
1/2 way up the retromolar pad
what is chiasma of facial muscles held together by fibrous tissue lateral and superior to each angle of the mouth
modiolus
what is the meeting place of the buccinators and other facial muscles near the mouth angle
modiolous
what happens to modiolus when teeth are loss
modiolus is displaced and give appearance of sunken cheeks
what surface on which denture must be thing to avoid modiolus from lifting denture
buccal surface of lower denture at premolar region
VDR is how many mm GREATER (an average) than VDO
VDR is 2-4 mm greater than VDO
in natural dentition the teeth are separated and the degree of separation (2-4 mm) is called what?
freeway space
when inserting maxillary record base for VDR, what do you instruct patient to do
instruct patient to lick their lips and swallow
open wide to fatigue, wet lips, swallow and relax
say “m” or “emma” or hum
swallow and relax
how many VDR measurements do you take
3
lower wax rim needs to be adjusted (shortened) until patient closes into a position 2-4 mm [more OR less] than vdr
LESS
what sounds to test for freeway space
pronounce the sibilant sounds “s”,”J”,”ch”, and “z”
sister sarah, count from sixty to seventy
what sounds to test for VDO lip competency
plosive “peter picked a pickled pepper”
___ -occlusion of opposing teeth when the mandible is in centric relation which may or may not coincide with maximum intercuspation
centric occlusion (CO)
___ - a maxillomandibular relationship in which the condyles articulate with the thinnest avascular portion of their respective discs in their most anterior superior position against the slope of the articular eminences
centric relation (CR)
___ with teeth present is a tooth to tooth relation whereas ___ is a static position with a bone to bone relation
centric occlusion; centric relation
wax rim measurements
anterior: 5 mm width
premolar: 7 mm width
molar: 10 mm width
anterior height (maxillary): 22 mm, 6 mm posterior
anterior height (mandibular): 18 mm, 1/2 way up pad
where do you measure VDO on manikin? what is the length?
gray to gray on magnetic plates; 40-42 mm
what do you mark on maxillary cast other than midline
alar width of the nose
commissure of the lip and smile line
mark line posterior to the canine
where do you remove wax on mandibular wax rim
2-3 mm posterior to canine and anterior to second molar position
what do you place in maxillary wax notches so wax doesn’t stick to both rims
vasoline
what can be used for CR record
alu wax (in lab)
super paste, clone bite or alu wax (in clinic)
do we place aluwax on maxillary or mandibular wax rim
mandibular
how do you verify CR record
re insert
the wax rim and have the
patient open and close
gently. Watching to
ensure the patient is
closing into the same
position
where to place springbow ear parts on manikin
approx 1 inch below the division of top half and bottom half
do we establish VDR or VDO ffirst
VDR then VDO
pin or flat end down on aritculator
flat end for denures
we are measuring mandibular movement with what
gothic arch tracer
for gothic arch tracing, you should draw a line where on mandibular arch cast
draw a line from base of retromolar pad to base retromolar pad and depth of the vesibule
where do you draw a plus sign on mandibular cast for gothic arch tracing? what is this for
mark a plus sign in center between two lines. this is where the stylus will line up
how flat should max record base be for gothic arch
flat enough for the plate to lay flat
what is this
plastic piece with bomb site (goes on maxillary plate)
what does bevel on bomb site always face
stylus/tongue
what is this
mandibular stylus
what is this
maxillary plate
how to tell between anterior and posterior on mandibular stylus
anterior = shorter
posterior = longer
how to tell between anterior and posterior on maxillary plate
anterior = smaller
posterior = more bulgy and screw is in this area
what do you cut into the sides of maxillary and mandibular gothic arch things
notches
if stylus on mandible and bomb site on maxillary, where does arrow point
posteriorly
if stylus on maxillary and bomb site on mandible, where does arrow point
arrow points anteriorly
for mand gothic arch plate, does poin point towrds mandible or maxilla
maxilla
stylus must sit up approximately how many mm from mandibular metal piece
5 mm
one full turn of stylus (360 degrees) equates how many mm
1 mm
gothic arch tracer has to be made at where
patient’s vertical dimension
need minimum ___ mm space between upper and lower wax rims to allow space for plaster or PVS material
5 mm
pin on ___ has to touch ___ when gothic arch tracers are on casts
hanau; incisal guide
pin on ___ has to touch ___ at patient’s vertical dimension
mandibular arch; maxillary arch
