Midterm 1 Flashcards
What is a Kennedy Class I?
Bilateral edentulous areas located posterior to the remaining natural teeth
What is Kennedy Class II?
Unilateral edentulous area located posterior to the remaining teeth
What is a Kennedy Class III?
Unilateral edentulous area with natural teeth remaining anterior and posterior to it
What is a Kennedy Class IV?
A single gap crossing the midline anterior to the remaining natural teeth
T/F: Classification should be made before any planned extractions.
False
Have hopeless teeth extracted then give the classification
T/F: If a third molar is missing and not to be replaced, it is not considered in the classification.
True
T/F: If a third molar is present and is to be used as an abutment, it is considered in the classification.
True
T/F: If a second molar is missing and is not to be replaced, it should still be considered in the classification.
False
If a tooth is not to be replaced it is not a part of classification
When might you not replace a 2nd molar?
No teeth opposing it
When there are multiple edentulous areas, which one determines classification?
Most posterior edentulous area
What is a modification?
An edentulous area other than those determining the modification
T/F: You can have a class IV arch with additional modifications.
False
What is the major connector of an RPD?
Thicker part of framework connecting parts on either side of arch
What are some examples of maxillary major connectors?
- Ant-post palatal strap
- Single palatal strap
- Modified full palatal
- Complete palatal coverage
- U shaped/horseshoe
When is a full palatal coverage major connector indicated in the maxilla?
- When the patient has 6 teeth or less
2. Very small mouth, flat or flabby ridges
What is the advantage of a modified full palatal coverage major connector?
Similar support to full coverage but does not cover rugae area behind incisors
When would a u-shaped/horseshoe major connector be indicated?
Patient has a large torus palitinus
Does not offer as much support as full or modified palatal
What are the three types of mandibular major connectors?
- Lingual bar
- Lingual plate
- Labial bar (swing lock)
T/F: Lingual bars have the highest patient acceptance of all mandibular major connectors.
True
What are the needed dimensions for a lingual bar?
Bar is 4 mm in height and top of the bar is 3-4 mm from FGM
When is a lingual plate indicated?
Lingual vestibule is < 7mm
T/F: Lingual plate is good to use when there is an anticipated loss of teeth.
True
T/F: Lingual plates can be used in the presence of lingual tori.
True
When is a swing lock major connector indicated?
- Missing key abutments
- Unfavorable contours
- Labial inclination of teeth
What is the main advantage of an intracoronal retainer?
Esthetics
What are the disadvantages of intracoronal retainers?
- Requires castings
- Complicated
- Difficult to repair
- Expensive
- May require splinting
What are the 4 parts to a basic clasp assembly?
- Rest
- Retentive arm
- Reciprocating arm
- Guiding plate
How much undercut is needed for the CC clasp retentive arm?
.01 inches
What is the purpose of the reciprocal arm?
Counteract retentive force of the clasp
What is the purpose of the rest?
Resistance to the RPD pushing too hard on the tissue
What types of rests are used on anterior teeth?
Cingulum rest (canines) or incisal rest
T/F: The guide plate is always next to the edentulous area.
True
T/F: CC clasps are highly indicated for Kennedy Class III arches.
True
When is it best to use an embrasure clasp?
Kennedy II or III with no mods or Kennedy IV
Need double rests
What are the six requirements for every direct retainer or clasp assembly?
- Support
- Stabilization
- Retention
- Adequate encirclement
- Reciprocity
- Passivity
Support is provided by the _____.
Rests
The minor connectors and guide plates provide the RPD with ________.
Stabilization
What is considered adequate encirclement?
Greater than 180 degrees
_________ means there is no active force on the tooth when the clasp is in place.
Passivity
What would be an application of the thinner mesh denture base?
When there is not much interocclusal space for a new tooth
T/F: Butt acrylic teeth are not indicated for Kennedy I or II arches.
True
T/F: The angle of the finish line with the major connector should be less than 90 degrees.
True
