Study Guide Flashcards
(26 cards)
Vertical Dimension of Occlusion/ Occlusal Vertical Dimension
can be determined by
it is..
need correct VDO for
- Height of the face when the teeth are in occlusion
- Can be determined either by natural teeth or artificial denture teeth
- Its the distance btw 2 selected points
- One fixed nose tip
- One movable chin
- Need to have correct VDO to record CR
Centric Relation
- CR is refrence point in recording the maxillomandibulat relations
- Independent of tooth contact
- Allows record the anterior posterior position of the mandible
- Can be verified and repeated
- Starting point for developing occlusion CR=CO
- Its a functional position
- CR must be recorded at the proper VDO
Helpful steps to verify that the patient can repeat closure into the CR position before recording position 3
- Mark 3 lines on rims of the wax that you casted (one at midline)
- Practice with patient while closing to make sure the 3 pairs of marks all line up
- Make sure the 3 pairs of lines line uo each time the patient closes (PCPG3)
Facial apperance of a patient whose wax occlusion rims are set too high an OVD 10
- Clicking of teeth
- Facial distortion, tense strained
- Difficulty closing lips
- Disfficulty swallowing
- Soreness and discomfort under denture
- Inc ridge resorption due to trauma
- Sore muscles
- ST sore spots
- No room for food
- Inadequate Interocclusal Rest Space=Excessive VDO
Anatomic description of CR position
- Centric position of mandible in relation to the maxilla(hinge position)
- Defined by positions of CONDYLES rather than teeth
- Should be conducive to health and relatively repeatable
- Patient can find stable contacts reelatively easily
Significance of interocclusal rest space or freeway space
- Difference btw VDO/OVD and VDR/PRP
- Space bte wax rims at physiologic rest position
- Usually 2-4mm
Signs and symptoms of excess OVD 5
- Sore muscles
- ST sore spots
- Rapid bone resorption
- Denture click during seech
- Pt complain no room for food
Use of the Fox Plane
- Orients occlusal plane
- Ensures parallelism from the frontal and sagittal planes with the interpupillary and ala-tragus lines respectively
- Can be used to help properly orient the occlusal plane
Trends in amount of wax showing below upper lip when patient is at rest
- 1-2mm
- See this measurement multiple times throughout the appt
- The longer the lower lip the less incisal display will be seen
Resons for wax rims to contour the way we learn
- Proper phonetics
- Lip support
- Occlusal plane
- Esthetics
Criteria for accurate trial denture bases 6
- Strength and rigidity
- Accuracy
- Must not rock
- Smooth polished
- Thickness and contour of denture borders are defined by the land master cast. The record base must not extend onto the land area of the cast
Functions of wax occlusion rims
Aid in prientation of occlusal plane
Provide proper support to the lips/cheeks
Determining Vertical dimension of occlusion
Used to make tentative centric relation records
Serve as means of transfer of the facebow
Aid in teeth placement
Material for trial denture bases
Triad Visible Light Cured Resin sheet
Trial denture bases are used for 4
Ultimate fate
- Labial contours of denture
- Occlusal vertical dimension
- Recording centric relation
- Placement of teeth
- Thrown away
Selective pressure technique for making master
- Records selected tissues in a displaced (functional) position
- Pressure is selectively placed on the peripheral borders and the unrelieved sections of the max tray
- Where the tray is relieved the tisues are recorded in their resting position (mucostatic)
Reason for patient to perform border molding functions with mouth and face 3
- Reestablishing lip support
- Correct support for cheeks
- Determines with, thickness, and height of border
What makes for the most accurate master impression
5
- Smooth well defined peripheries
- Maximum extension
- Even pressure distribution
- no show through
- Intimate tissue contact
- Must be perfect in every way bc this impression forms the exact shape of future dental base
Areas that require block out or relief on Dx cast prior to fabrications of custom impression tray
Max-4
Mand-3
- Max
- Frenum
- Buccal surface of tuberosity
- Rugae
- Flabby portions
- Mand
- Frenum
- Mylohyoid ridge
- Buccal side of ridge
Why leave dentures out of patients mouth 24hrs before making master impression
Allows ST to go uncompressed and into thir natural position
Purpose of Diagnostic cast
Locate undercuts
Fabricate custom impression tray
Importance of proper location of the border of the custom impression tray
- 2 mm short of the depth of the vestibule (when tissues are at rest) to allow PVS material to flow out of the top and capture the border accurately
- Want borders to be clear of frenum
Effects of a denture border that is inadequate in height of thickness 3
- Little suction
- Not enough retention
- Can rock and lead to fracture
How to improve a custom imoression tray that might not extend far enough into the vestibule
Border molding
How far away from depth of vestibule should we make the custom impression tray
- Max
- 2mm short of depth of vestibule
- Mand
- Ling needs to be smooth
- Capture retromolar pad
- Handles on ridge
