maxillo-mandibular relations Part I Flashcards
what is the posterio palatal seal
a raised acrylic resin area of the posterior border of maxillary denture
what is the roll of the posterior palatal seal
enhance retention and maintains peripheral seal
how does the posterior palatal seal retain and maintain the peripheral seal
compensates for polymerization shrinkage
Minor denture base functional movement
what is the junction between the mobile and non-mobile portion of the soft palate
Vibrating ling
how much does acrylic resin shrink during curring
7%
what is the point of record bases and wax rims
Establish VDO
record maxilar mandibular relationship and guide tooth position
determine position and arangement of denture teeth
what must be done to ensure denture occlusion balance
transfer of patients maxillo-mandibular relationship to articulator
what is a record base
An interim denture base used to support the record rim material for recording maxillo-mandibular records
what is an occlusion wax rims
Occluding surface fabricated on record bases for purposes of making MMR and arranging denture teeth
what do record bases and occlusion wax rims allow for
establish facial contours by providng proper support for lips and cheeks
aid in orientation in occlusal plane
Aid in tooth selectrion and anterior tooth placement
Establish and maintain the VDO
serve as a means of transfer of face bow record
what does the temporary form of record bases and occlusion wax rims Representing base of a CD determine the relation of maxilla and mandible allow for
aid in tooth selection and arrangement needed to make stable interocclusal records
how much of the vestible should be filled
Filled completely to enhance the peripheral seal of the record base and improve retention
what anatomical landmarks are used for occlusal plane determination of the cast
crest of the ridge
Retromolar pad
what does the retromolar pad do as a landmark
1/2-2/3 of the Height dictates the occlusal plane
what does the crest of the ridge do as a land mark
Aligns with the central fossa of denture teeth
what should be marked near for the retromolar pad
- a line on the land area that bisects the middle of the retromolar pad and is continuous with the center of the residual ridge
- mark a line of the land area the represents the mandibular occlusal plane, placed at 1/2-2/3 the height of the RMP
what should the occlusal portion of the wax rim look like as measurements
Molar region: 8-10 mm
Premolar region: 5-7 mm
Anterior region: 3-5mm
how should the occlusal portion of the wax rim be tilted
Just slightly anterior beyond the edge of the land area(15 degrees)
what should the lingual contours not impinge on
On the tongue
What are the heights of the maxillary occlusal wax rim
Frontal: 22mm
Posterior: 8mm
what are the heights of the mandibular wax rim
frontal: 18mm
lateral: 2/3 height of the RMP
Posterior:1/2-2/3 up the retromolar pad
where should the rim be centered
Over the crest of the ridge to maximize denture stability
how should record bases an occlusion wax rims look when done
Must be stable
accurately adapted to master casts
Rigid
fully extends to the depth of the vestibule
peripheries smooth and rounded fr comfort
simular the borders and denture base of the definitive/final prosthesis
why would a record base by loose/inacurate
Poor adaption to cast
excessive block out
over/under extension
what should you do if base is slightly lose
Use denture adhesive
what should you do if base is very lose
Remake record base
how much wax display should there be when the wax rim is in
1-3mm in women
0-1mm in men
how does display of wax rim change with age
Decreases:
young(F/M): 2,1
middle (F,M): 1,0
Old*F.M): 0,-1
what should be done for the midline when using an occlusal wax rim
Mark by bisecting the long axis of the face(ignore nose)
how do you check for a high lip line
Patient is asked to give an exagerated smile and horizontal line is scribed on the wax rim to record maximum elevation/retraction of the upper lip
how do you mark the distal aspects of the canine
use the lines through the pupil
-or-
use lines extending from the ala of the nose
where must the incisal edge of the wax rim be located
touch the wet dry junction (check to see if they can make F and V sounds)
how is occlusal plane found medio-distally
Parallels the pupils in the anterior
what is used to help establish occlusal plane anteriorly and posteriorly
Trubyte fox occlusal plane plate
how is the occlusal plane done anterior-posterior
Parallel to the ala-tragus line/Camper’s line
what is the virbating line made out of
Glands
what should the patient be doing when you are looking at the wax rim
be involved so that they can accept denture better
problem with facial hair when doing rims
can add bulk that what put in place to fight the look of no teeth
what smile line is the most esthetic
A curved smile line
