Lecture 5-Support & Occlusion Flashcards
WHAT is the RESISTANCE to forces at a RIGHT ANGLE to the occlusial surface of a denture (tissue ward movement of the denture)?
SUPPORT
The quality of _______ depends on the THICKNESS of the soft tissue that covers the bone
SUPPORT
What are the two SUPPORT areas of the maxillary arch? What is the PRIMARY support area?
1.Crest of the ridge 2.HARD PALATE (PRIMARY support area)
What are the 3 SUPPORT areas in the mandibular arch? What are the two PRIMARY?
1.Buccal Shelf (PRIMARY) 2.Retromolar pads (PRIMARY) 3.Slopes of the ridge (not primary :)
Maximum SUPPORT is achieved by maximum WHAT?
TISSUE COVERAGE (hence a proper final impression)
What is the resistance to HORIZONTAL displacement by functional forces?
STABILITY
What are the 4 factors affecting stability?
1.Anatomy of the residual ridge 2.Flanges of the Denture 3.Posterior Teeth 4.Occlusion
When looking at ideal anatomy to aid in STABILITY, we are looking for _____ ridges width and height (mand and max) and ______ ridges on the mand and max.
equal….parallel
Higher and more ________ the FLANGES are to the occlusal surfaces the more STABLE is the denture to HORIZONTAL forces
perpendicular
For ideal stability the posterior teeth should be on the ______ (______) of the residual ridges.
crest (center)
What is the best type of occlusion for ideal STABILITY (horizontal forces)?
BALANCED occlusion
What is the resistance of the denture to DISLODGMENT?
RETENTION
Factors affecting Denture RETENTION: ________- the molecular attraction between UNLIKE molecules
ADhesion
Factors affecting Denture RETENTION: _______-the molecular attraction between LIKE molecules
COhesion
Factors affecting Denture RETENTION: The GREATER the area of contact between the denture base and the mucosa and the _______ the salivary film, the GREATER the Magnitude of the retentive forces as a result Of ______ and ______
Thinner….Adhesion and Cohesion
Factors affecting Denture RETENTION: Atmospheric pressure- Is the _______ pressure due to the weight of the atmosphere upon surfaces
hydrostatic…WTF?
Factors affecting Denture RETENTION: What needs to be present to utilize ATMOSPHERIC pressure as a retentive force to keep border tissues in contact with the denture base
a PERIPHERAL SEAL
Factors affecting Denture RETENTION: ________ is the SIMULTANEOUS contact of the Maxillary and the Mandibular posterior teeth during various jaw movements
BALANCED OCCLUSION
Factors affecting Denture RETENTION: What prevents tipping or rotating or the denture base in relation to the supporting structures?
BALANCED OCCLUSION
What do you need to complete a balanced occlusion when working with monoplane teeth?
balancing RAMPS
How many points of contact do you need all lateral excursions to officially have bilateral balance?
3
What are the two types of non-anatomic occlusion?
Monoplane (neutrocentric) and Balanced (balancing ramp_
Why do we have monoplane occlusion?
to reduce the horizontal forces
Typically when selecting Non-Anatomic denture teeth the ________ concept is used as a guide for setting the teeth
neutrocentric
This concept of occlusion assumes that the anterior- posterior plane of occlusion should be parallel to the denture foundation area and not dictated by condylar inclination.
neutrocentric
In neutrocentric occlusion, the anterior-posterior plane of occlusion should be parallel to the _________
denture foundation area
IS neutrocentric occlusion dictated by condylar inclination?
NOOOOO (dictated by plane of occlusion parallel to foundation area)
In a neutrocentric concept the plane of occlusion is completely ______ and ______.
FLAT and LEVEL
Do we have Curve of Wilson or Curve of Spee incorporated into the setting of neutrocentric teeth?
NO
Do we have vertical overlap in neutrocentric occlusion?
NO (edge to edge)
Does the patient incise a food bolus? What types of eating movements does the patient have to learn?
NO incise of bolus….pt must be a “chopper” and can no longer chew or grind
When setting neurtocentric teeth the horizontal and lateral condylar guidance should be set at _____.
ZERO
Neturocentric: In Class II patients the mandible tends to travel farther _______ in function and consequently more ________ overlap is necessary
anteriorly….horizontal overlap
Neutrocentric: Class III patients often demonstrate little or no ______ movement of the mandible during function. Consequently, little or no ______ overlap is developed in the set up.
anterior….horizontal
The mandibular occlusal table should end prior to the _________.
ascending ramus
The distal surface of most posterior maxillary denture tooth should extend __-__mm distal to the most posterior mandibular denture tooth.
1-2mm
WHAT feature MUST YOU HAVE to prevent biting of the cheek/corner of the mouth?
Horizontal overlap in the posterior!
The flatness of the maxillary ________ is provided by the flat buccal and lingual cusps, BOTH are going to contact the occlusal plane
PREMOLARS
What is Christiansen’s phenomenon?
the STEEPER the condylar inclination, the GREATER the posterior discrepancy in EXCURSION
What does Christiansen’s phenomenon mean for getting balanced occlusion with a monoplane set up?
we need BALANCING RAMPS! to fill the gap of the posterior discrepancy in excursion
Lateral or tipping forces tend to have an unfavorable effect on denture ______
STABILITY
Bilateral balance decreases the transmission of ______ tipping forces
LATERAL
_________ occlusion attempts to further decrease tipping forces by minimizing the effect of incline plane contact between the maxillary and mandibular denture.
monoplane
Bilateral balanced occlusion when using _____ degree cusped teeth is obtained by using balancing ramps.
zero
What are the two sources of inclined plane contact?
1.CUSPAL INCLINES of the maxillary and mandibular denture teeth 2.verticle overlap of the maxillary and mandibular ANTERIOR teeth
What are the two occlusal schemes we can achieve lingualized occlusion?
1.Bilateral Balanced 2.Maxillary anatomic opposing mandibular non-atomic
Lingualized occlusion: the dominant max lingual cusp and the simple mand fossa make a _______ and ______ type occlusal pattern.
mortar and pestle
Lingualized occlusion-there should be about a __mm space between the lingual inclines of the _____ cusps of the max teeth and the buccal cusps of the mandibular teeth.
1mm…buccal (essentially 1mm horizontal overlap)
In lingualized occlusion- There should be NO ______ cusp contacts of posterior teeth in centric or in lateral excursion.
buccal
What is the primary difference between lingualized occlusion with anatomical VS non-anatomical mandibular teeth?
non-anatomical mandibular teeth uses a NEUTROCENTRIC concept because we are not attempting to balance occlusion
WHAT ARE THE 5 FACTORS OF THE HANAU QUINT??
- Condylar Incline/Guidance 2.Incisal Guidance 3.Curves (spee,wilson) 4.Cusp Angles/Heights 5.Plane of occlusion/orientation
It is a measurement of the path traveled by the condyles in the TMJ area during various mandibular movements.
Condylar guidance
Average inclination for complete denture patient is ____ degrees
30 degrees
How do you record a condylar inclination? What appointment?
Protrusive check-bite record…the TRY-in appt (4th)
_______: angle formed by drawing a line in the sagittal plane between the incisal edge of the
maxillary and mandibular teeth when teeth are in CO and the horizontal plane…WHY do we CARE???
Incised Guidance Angle…helps set the anterior teeth so they don’t contact during centric and eccentric movements
What is THEILMAN’s formula???
C=Condylar Inclination x Incisal Guidance / OccPlane x Cuspal Inclination x Comp Curve
What does C equal in Thelmans formula?
C = balanced occlusion
Thielman’s formula–WHEN all five factors are in balance, all teeth contact in ________ positions
excursive
Hanau’s Quint: if the incised guidance is increased what happens to the posterior teeth?
they will disocclude
Its advised when using zero degree cusps to decrease the ________-
incised guidance (by decreasing Verticle overlap)
What is the ONLY factor in Thielman’s formula the dentist cannot change?
Condylar Inclination
Of all the Hanau’s Quint/Thielman’s factors, What is the most recommended adjustment for setting denture teeth?
MINIMIZE INCISAL GUIDANCE
Thielman’s formula: can you alter Occlusial plane very much?
NO, functional requirements dictate position
Thielman’s formula: what is the recommendation for the amount of cuspal inclination?
REDUCE cuspal inclination to help reduce horizontal forces of occlusion
Thielman’s formula: The __________ is very helpful in obtaining balanced occlusion and depending on the posterior tooth forms it can EASILY be corrected to facilitate posterior tooth contacts in eccentric positions.
Compensating Curve
What are the two factors in Thielman’s formula that are easiest to alter to obtain balanced occlusion?
incised guidance and compensating curve
HAHA in the PPT (not the manual)…WHERE is the Max 1st molar- MB cusp? ML? DB cusp? DL cusp?
MB-on the plane, ML-on the plane, DB-.5mm off, DL-.5mm off
How far off the occlusal plane is the max second molar?
1mm
How many contacts do we need in working side and balancing side to officially have balanced occlusion?
2 working, 1 balancing
