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159 Cards in this Set
- Front
- Back
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What K classification is observed when only tooth numbers 19,22,23,24,26,28,30,31 are present?
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Class II Mod 3
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What K classification is observed when only tooth numbers 14,11,10,9,8,7,6?
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Class II Mod1
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T/F Classification should follow rather than precede an extraction of teeth etc.
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True
(wait is this right?!?) |
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T/F
The most posterior modification space always determines the classification |
T
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The superior edge of a lingual bar major connector must be located ___ mm away
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3-4mm
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A K1 maxillary situation is best served when you use a __ major connector when only the 6 maxillary anterior teeth are present
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Full Pallate
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A patient has teeth numbers 6,7,8,9,10,11 remaining. When positioning the major connector, how close should the major connector be positioned in relation to the marginal gingiva?
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5-6mm
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T/F
a K4 can have only one modification area |
False
NO mod areas |
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Name four types of maxillary major connectors
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AP Bar
U shape Palatal Bar Palatal Strap |
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What major connector is used to stabilize the lower anterior teeth?
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Lingual Plate
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What is the cross sectional shape of a lingual bar?
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1/2 Pear shaped
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What mandibular major connector is best used when tori are present?
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Lingual Plate
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What does a major connector provide?
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Cross-arch stabilization and Rigidity
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What K classification is observed when tooth numbers 30,28,24,23,20,19,18,17 have been extracted?
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Class II Mod 3
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What are the uses for a surveyor?
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1. Survey a master cast
2. Survey a crown 3. Survey a final cast |
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What K classification is observed when only tooth numbers 32,31,20,29,17,18,19,20,21,22 are missing. /there is a mandibular torus on each side of the mandible in the area of the first and second premolars. Hpw would you approach this case and what major connector would you use?
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Place a lingual rest on #22 and an occlusal rest on #28 placed mesially. Using a lingual plate to avoid the tori
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When should the design of the major connector be determined?
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During the diagnostic and treatment planning phase
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An internal occlusal rest is ?
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Built into the crown itself
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What are the four factors that determine the path of placement or removal of the RPD?
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1. Parallelism of abutments
2. Retention 3. Esthetics 4. Interferences |
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What are three purposes that the use of the surveyor will address?
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1. Identify the best path of removal and placement of the RPD
2. Determine undercuts of abutments for retention 3. Determine parallelism of abutment teeth |
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What are two types of surveyors commonly used?
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Jelenko
Ney |
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What is a guiding line?
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The largest diameter of the tooth circumferentially synonomous with HOCL. Determines clasp placement
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What amount if measured undercuts should be used for Cast RPDs?
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The thickness of the undercut is determined by the type of metal being used and its inherent strengths (0.01-0.03 inches)
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What are two other names for a lingual rest?
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Ledge Rest
Cingulum Rest |
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The width and depth of an incisal rest seat should be?
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2.5mm x 1.5mm
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What are the functions of the minor connectors?
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1. To connect the major connector with the rest of the RPD (rests, clasps, etc)
2. To direct the forces along the vertical axis of the tooth |
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Whre is the deepest portion of an occlusal rest located?
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Between the marginal ridge and end of fossa furthest away from the marginal ridge that is crossed by the rest
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List in order of desireableness which material is best suited to support the rest of RPD
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1. Metal (chrome cobalt, gold, etc)
2. Enamel 3. Amalgam 4. Composite |
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T/F
The angle formed by the rest and the vertical minor connector should be more than 90 degrees |
False
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When and if you expose the dentin of a tooth while preparing a rest seat area for a RPD case, what is your next step?
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To place a restoration in that area
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What should the width of the occlusal rest seat area be?
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2.5 mm
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T/F
An incisal rest is more likely to lead to some orthodontic movement of the tooth because of unfavorable leverage factors than is a lingual rest. |
True
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T/F
A dental surveyor is an instrument used to determine a height of contour line for a tooth or tissue undercuts |
True
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What is the purpose of a desireable undercut when developed in RPD construction?
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Retention of the clasp
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An analyzing rod and pencil is used in RPD development to place tripod marks on a dental RPD case. Another attachment that will make a mark is the _____ rod
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Graphite
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Teeth #28,29,30,31,32,17,18,19 have been removed. What type of rest seats would you place and where are they positioned on the abutment teeth?
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Lingual rest seat on #27 lingually
Occlusal rest seat on #20 mesially |
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Name 3 methods of modifying a natural tooth when it is required to raise or lower its HOCL
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1. Removal of enamel
2. Crowing of the tooth 3. Inlay |
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When beginning to survey a RPD cast, the mobile base should __________________.
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Be positioned in a horizontally parallel plane of occlusion
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A HOCL must be positioned where, to be effective?
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In the middle of the middle 1/3 of the abutment
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Please explain what is meant by an AP bar. What is it composed of and where it is extended posteriorlly?
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Composed of anterior bar and posterior strap or vice versa. It extends to the posterior of the hard palate, not on the soft palate.
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T/F
The retentive arm of a circumferential clasp does contain a rigid portion |
True
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What kenned classification occurs when teeth 32,31,20,21,20,19 are extracted?
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K1 mod 1
Not RIGHT |
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What clasp has the most flexibility in the retentive arm?
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Back action clasp
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Which clasp is best suited to approach a tipped molar?
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Ring clasp
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Describe a C clasp to gain maximum flexibility
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In order to get maximum flexibility use a long c clasp or combine clasp with a wire
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What factors affect the flexibilit of a clasp retentive arm?
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1. length
2. Cross-sectional diameter 3. Cross-sectional form 4. Material used in construction |
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Where does the undercut gauge establish a measurable area?
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Below the guide line
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A cast RPA clasp differs from a C clasp because it has a _________________________________________ as it is used on an abutment tooth adjacent to distal edentulous ridge.
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Mesial Rest, Guiding Plane, Retentive Arm
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Where is the retention for an RPI bar clasp system on the abutment tooth for the RPD?
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Mid-facial
RPI Mesial Rest Proximal Guiding Plate I Bar Clasp |
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When a cast has 0.1 in retention arm below the HOCL, does this equal a 0.3 undercut retention of a clasp constructed of a wrought wire retentive arm?
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Yes
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What are two types of surveyors commonly used?
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Jelenko
Ney |
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What is a guiding line?
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The largest diameter of the tooth circumferentially synonomous with HOCL. Determines clasp placement
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What amount if measured undercuts should be used for Cast RPDs?
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The thickness of the undercut is determined by the type of metal being used and its inherent strengths (0.01-0.03 inches)
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What are two other names for a lingual rest?
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Ledge Rest
Cingulum Rest |
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The width and depth of an incisal rest seat should be?
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2.5mm x 1.5mm
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T/F
The retentive arm of a circumferential clasp does contain a rigid portion |
True
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What clasp has the most flexibility in the retentive arm?
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Back action
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Which clasp is best suited to approach a tipped molar?
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Ring
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Describe a C clasp used to gain maximum flexibility
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In order to get maximum flexibility we must use a long c clasp or combine the clasp with a wire
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T/F
The rest of an RPD should never be placed on a sloping surface such as the lingual of an anterior tooth, which has not been prepared for a rest. |
True
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What are the 5 basic tilts of the surveyor?
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1. Right lateral
2. Left lateral 3. Anterior 4. Posterior 5. Horizontal |
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T/F
By a RPD cast positioned on a surveyor we can increase desireable undercuts and decrease undesireable undercuts |
True
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The surveyor tool which can indicate the depth amount of undercut above the HOCL that is to be used for an RPD is called the?
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There isn't anything to indicate undercut Above ONLY BELOW
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The first major consideration in selecting a path of insertion for a RPD is?
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Anterior space for best esthetic results
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What are three advantages of bar clasps?
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1. Esthetics
2. Less conductive to caries 3. More flexible because of its longer length |
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what is a disadvantage of a bar clasp?
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It provides less bracing
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What are some advantages of a circumferential direct retainer?
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More easily repaired
Easier to design and construct Excellent bracing qualities |
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What is a disadvantage of a circumferential retainer?
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More conductive to caries
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T/F
A bar clasp cannot be used on molars |
False
It can be used on molars |
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What type of soldering is the most preferred in RPD construction procedure?
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Electro soldering
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What is the name of the process when the heat is high enogh and long enough causing microstructure of wrought wire to disappear?
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Recrystallization or grain growth
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What is the amount of undercut necessary to achieve adequate retention when using gold for casting RPD is?
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0.02 inches = gold
(0.03 for wrought wire, 0.01 for chromium cobalt) |
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What does RPA direct retainer mean?
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R = mesial rest
P = guiding plane A = retentive arm |
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What does RPI stand for?
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R = Mesial Rest
P = Proximal Plate I = I bar clasp |
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Which clasp requires careful and great amount of tooth preparation?
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Embrasure clasp
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When wrough wire is heated, its physical properties and microstructure may be altered depending on?
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1. Temp
2. Heating Time 3. Cooling operation |
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What is the modulus of elasticity?
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The rigidity of a metal
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Why are chromium cobalt alloys good?
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1. High strength
2. Low cost 3. less undercut needed for retention |
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T/F
A high yield strength and a low modulus of elasticity will produce a high flexibility. |
True
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Chromium cobalt alloys used in RPD construction have a ___ density than gold alloy
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Lower density
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T/F
A work authorization is a dental prescription, which is a legal document |
True
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Name six elements of a work prescription that must be written on the authorization form
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1. patients name
2. dentists name 3. labs name 4. dentist license number 5. dentist signature 6. instructions, date |
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What is the special technique that is used to box and bead an alginate impression?
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No need to box and bead an alginate impression
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Name three types of temporary partial dentures
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a. Interim
b. Treatment c. Provisional |
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Which temporary RPD would you use for a patient that is 15 years old and has had two form teeth knocked out?
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Interim
Waiting for the person to stop growing. To hold teeth in place while the patient is healing |
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Which impression materials can be used to take a final RPD impression?
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1. Rubber base
2. Alginate 3. silicone 4. Polyether |
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What types of partial dentures are permanent RPDs?
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Cast gold and Cast chrome cobalt
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The superior edge of the lingual bar major connector must be located ___ mm from the gingival margin
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3-4mm
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A patient has teeth numbers 6,7,8,9,10, & 11 only remaining. When positioning the major connector, how close should the major connector be positioned in relation to the marginal gingiva?
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5-6 mm
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T/F
A Kennedy class IV can only have one modification area |
False
(end Q3 2009) |
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List the 4 necessary features that a direct retainer (clasp) must possess in order to be considered adequate.**
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1) Retention Arm
2) Bracing Arm (reciprocal arm- always above the height of contour) 3) Rest (support) 4) Minimum of 180 degree encirclement |
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An undercut gauge is an attachment use in an RPD case survey to develop:
a) bracing b) support c) occlusion d) reciprocation e) retention |
Retention
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What is the statement that accurately describes when a cantilevered attachment is used in developing a _______ RPD.
a) intracoronal b) coronal c) extracoronal and precision d) extracoronal |
Extracoronal and precision
Extracoronal (both these answers were accepted on quiz 4, 2009) The term Internal attachment has been replaced by the term precision attachment, which refers to an interlocking device, one component of which is fixed to an abutment or abutments, while the other is integrated into a removable prosthesis to stabilize and/or retain it |
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The amount of undercut required when using gold metal for an RPD framework to assure an adequate retentive depth is:
a) 0.01mm b) 0.02mm c) 0.03mm d) 0.02 in e) 0.01 in |
0.02 in for gold
(0.01 for chrome cobalt, 0.02 for gold, & 0.03 is for wrought wire) |
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During surveyin, the analyzing rod is first used to identify the areas on a potential abutment tooth that can aid or impede the final RPD design. The part of the rod which touches the tooth is the:
a) tip b) side c) other |
side
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The line that can be drawn around the abutment tooth during surveying for an RPD is often referred to as?
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Guide Line
Survey Line HOCL |
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The amount of undercut used in developing retention for an RPD to be made of a type of chrome-cobalt alloy is?
a) 0.01 in b) 0.02 in c) 0.03 in d) 0.03 mm e) 0.01 mm |
0.01 in
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What does HOCL stand for?
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Height of Contour Line
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If a rest of an RPD is left in premature occlusion with a natural tooth in the opposing arch, harmful symptoms can develop. Name four.
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1. Pain through trauma
2. Cause tooth mobility 3. Break the rest from the RPD 4. Fracture the opposing tooth (end Q4 2009) |
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What is meant by a reline of an RPD denture base area?
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to resurface the tissue side (Intaglio) of a denture with new base material so that it will fit more accurately.
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What is meant by a rebase of an RPD denture base area?
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A rebase is a complete change of all the acrylic holding all of the teeth. You take all the acrylic away, only keep the teeth in their orientation to the opposing arch.
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What are the positive features of an acrylic base material?
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§ Easily reparable
§ Esthetics - mucosal color § Easier to fabricate § Easier to polish § Easier to adjust § Less expensive § Less wear on natural teeth |
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What are the positive features of a metal based material?
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§ It's stronger than acrylic
§ Easier to clean (no porosity) § Conductibility □ Metal is good for thermal conductivity□ This is a positive thing § Will not warp |
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List 2 negative features of an acrylic base material.
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1) Non-conductive □ Does not stimulate the tissue beneath the RPD. This is a negative thing
2) Not as strong as metal 3) More tissue allergies 4) Cleaning -- sometimes if the acrylic is porous, bacteria can get into the pores and cause a discoloration. |
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Explain Veau's #3 description of a cleft palate:
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III = soft palate + hard palate + extends through anterior ridge
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T/F
When recording the vertical dimension of occlusion in order to mount a complete denture opposing an RPD case, it is necessary that this record be taken in a centric relationship position |
True
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What type of impression should be performed in order to reline an upper denture?
a) open mouth b) close mouth c) functional mouth d) anatomical mouth |
Closed mouth
§ For a complete denture, this is a closed-mouth situation □ When you take the impression, you have the patient close and just hold the denture in place § For a partial denture, this is an open-mouth situation □ You push the framework in place, holding the direct retainer and the anterior indirect retainer in place |
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A work authorization form is considered _____
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A legal document
A prescription (end Q5 2009) |
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Two types of dental reline or tissue conditioners by base composition are:
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1) Acrylic Based
2) Rubber Based (beginning of Test II, 2009) |
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Which chemical element is used as a catalyst in order to initiate the setting of the tissue conditioning material (reline material)?
a) methyl methacrylate b) aromatic esters c) hyrophosphagin d) none of the above |
Aromatic Esters
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Which of the following soft dental reline materials are considered rubber based?
a) Coe-comfort b) Coe-soft c) Viscogel d) A & B e) A B & C f) Novus 7 |
Novus 7
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Which soft reline material will last and maintain accuracy longer?
a) chairside placement b) cured c) same d) non of the above |
Cured
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T/F
Under prolonged static loads, the tissue conditioning agents and soft tissue materials behave as a viscous liquid. |
True
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Optimum tissue recovery and oral tissue health will occur if the offensive prosthesis is withheld for:
a) 24 hrs b) 48-72 hrs c) 3 days d) 5 days e) 30 days |
48-72 hrs
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Tissue conditioning material (resins) can be used as:
a) impression material b) functional impression material c) method to treat abused tissue d) A & C e) B & C |
Functional impression material & Method to treat abused tissue
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Short-term longevity for tissue conditioning material is:
a) 1-3 weeks b) 3-6 months c) up to 3 years d) none of the above |
1-3 weeks
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The flushing action of the ___ can leach out of the plasticizers causing loss of elastic properties
a) methyl methacrylate b) aromatic ester c) saliva d) none of the above |
Saliva
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What is the duration time of Novus 7?
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3 Years
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What is the duration time of Coe-soft 7?
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3-6 Months
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What is the duration time of Coe-comfort?
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A few Days
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What is the duration time of Lynal/Viscogel?
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A month or more
(end of Test II, 2009) |
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The measure of the stiffness of a metal is known as the ____?
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Modulus of Elasticity
(beginning Q8, 2009) |
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An 18 yr old patient has lost teeth numbers 28, 29, 30, & 31. The 3rd molar #32 is present, but is tissue impacted and is in a normal position to erupt favorably. Your treatment is to:
a) extract the 3rd molar b) construct a KII RPD c) anticipate using the 3rd molar once it erupts to develop a KII d) all 3 situations are acceptable |
All of the above
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Minor connectors must be placed no closer than:
a) 1-3 mm apart b) 1-3 in apart c) 4 mm apart d) 5 mm apart e) 1 in apart |
5 mm apart
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During your initial surveying, in order to develop a retentive area on a potential abutment tooth, it is necessary to:
a) have an HOCL high toward the occlusal or incisal in the retentive area b) have an HOCL low toward the gingival in the retentive area c) none of the above |
have an HOCL high toward the occlusal or incisal in the retentive area
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T/F
The post dam area of the mandibular RPD should be placed between the anterior and posterior vibrating lines |
False
□ The postdam must have (1)A vestibular turn (2) Postdam (3) And postdam through the hamular notches |
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T/F
A chrome cobalt metal framework has a lower yield strength than gold |
TRUE
Yield strength is the greatest amount of stress an alloy will withstand and still return to its original shape in an unweakened condition. |
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The reason the chrome cobalt metal alloys are used instead of gold are:
a) they have a high yield strength b) they are far less expensive c) they have a high density d) they have a low modulus of elasticity |
They are far less expensive
(the rest of the answers should be just the opposite to make that true for chrome-cobalt) |
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In order to attach wrought wires to an existing RPD framework, _________soldering is preferred rather than _______ soldering.
a) torch soldering; electric soldering b) electric soldering; torch soldering c) torch welding; electric welding d) electric welding; torch welding |
Electric soldering; torch soldering
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T/F
Tapering of a metal clasp arm permits a more uniform distribution of service stresses throughout the length of the arm |
False
○ A clasp arm that is tapered will have twice the flexibility of one not tapered. (end of Q8, 2009) |
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T/F
Using an upper and lower K1 type RPD with no natural tooth stops, the dental practitioner can open the VOD using the RPDs to maintain the vertical dimension. |
False
ONLY the TEETH are used to maintain Vertical Dimension (begin Q12, 2009) |
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Centric occlusion is a ______ measurement
a) gingival occlusal b) eccentric c) horizontal d) none of the above |
Horizontal
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Lower anterior porcelain teeth are retained in the denture base by:
a) chemical reaction combining with the .... b) undercuts on the prosthetic teeth c) retentive pins d) none of the above |
Retentive pins
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A premature occlusion will result in:
a) loss of retention b) inadequate balance c) breaking or chipping d) all of the above |
all of the above
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T/F
A cast "C" clasp has edge strength |
True
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Grain growth and recrystalization are products of ______ wrought wire.
a) tapering b) over-heating c) malleability d) over-worked e) annealing |
over-heating
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Name 3 types of elastic impression materials
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Polyether
Polyvinyl Silicone Alginate irreversible hydrocolloid Reversible hydrocolloid |
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What tooth cannot accommodate a back action clasp?
a) canine b) premolar c) molar d) all of the above |
Molar cannot use back action clasp
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Teeth #s 17, 32, 4, 5, 9, 10, 12, 13 have been extracted. What is the kennedy classification?
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Class III Mod 2
(end of Q12, 2009) |
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What is a positive bone index?
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Radiographic confirmation that bone structure can support a denture
(begin Q9, 2009) |
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What is a negative bone index?
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Radiographic evidence that bone structure cannot support denture
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What is an arcon articulator?
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Articulating condyle articulator
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What is a kinematic facebow?
|
face-bow, kinematic (hinge-bow) a face-bow attached to the mandible with caliper ends (condyle rods) that can be adjusted to permit the accurate location of the axis of rotation of the mandible.
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What is an arbitrary facebow?
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A bite registration to line up max and mand casts on articulator. There is not much difference between the result of a kinematic and arbitrary face-bow
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An altered cast technique is a:
a) mucostatic impression technique b) anatomical impression technique c) selective pressure technique |
Selective Pressure Technique
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In the altered cast technique there are:
a) on master cast b) two master casts c) a combined first and second master cast d) none of the above |
Two master casts
A combined first and second master cast |
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The Kennedy classification most altered cast impression techniques are used for is:
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K1
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The term combination clasp refers to a:
a) circumferential type clasp b) bar type clasp c) cast and wrought iron type clasp |
Circumferential clasp
Cast and wrought iron type clasp |
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What is Passavant's pad?
|
A prominence on the posterior wall of the nasal pharynx formed by contraction of the superior constrictor of the pharynx during swallowing
(end Q9, spring 2009) |
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What is the vertical dimension of rest for removable prosthodontics?
|
A relaxation of the facial and cranial musculature that allows the upper and lower jaw to assume a natural position without any occlusal interference or contact
(begin Q10, spring 2009) |
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Define centric relationship of Occlusion for removable prosthodontics
|
A horizontal jaw relationship record when the prosthetic teeth are in occlusion
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T/F
The interocclusal freeway space is the rest vertical dimension plus 3-4 mm |
False
the interocclusal distance or separation between the occlusal surfaces of the teeth when the mandible is in its physiologic rest position |
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The vertical dimension of rest is measured on the patient in the ____ area.
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Anterior area
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Define centric relationship when used for removable prosthodontics.
|
The most unstrained posterior relation of the lower to the upper jaw from which lateral movements can be made
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Place in order of when record is taken for the interjaw relationship
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1) Face-bow
2) Vertical relationship 3) Centric relation 4) Protrusive record |
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A patient has lost teeth #s 1,2,3,4,12,13,14,15,16,17,18,19,20,21,28,29,30,31,32 through extractions. Which interjaw procedures are necessary to record the patients dental condition on an articulator?
a) protrusive and vertical dimension of rest b) centric relationship and functional vertical dimension c) centric occlusion and vertical dimension d) centric occlusion and protrusive |
Centric relationship and functional vertical dimension
(there are no posterior teeth to come into MICP) |
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T/F
If the vertical dimension of rest is incorrectly obtained, and the patient's interjaw record is increased, then the following symptoms occur: pain, TMJ dysfunction, speech and swallowing difficulty, denture instability, premature occlusion |
True
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Name the three factors found on your mounted casts that will determine the FINAL planes of occlusion for your removable prosthodontic case:
|
?No Idea?
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Your patient has had teeth #s 20, 21, 28,29 and 30 removed. The upper arch has Teeth #s 8,9,10,5,6,16, removed. What will be the determinant of the occlusion?
a) molar method b) place patient in CR at a functional vertical dimension c) use the natural tooth occlusion |
Use the Natural Tooth Occlusion
(end Q10, spring 2009) |
