Midterm Flashcards
Where do you not set teeth past on the mandibular arch?
Where the alveolar ridge starts to ascend to the retromolar pad area.
PAS Negative
Metal Allergy
PAS Positive
Candida
What is the most aesthetic replacement tooth?
Tube tooth
How far from the gingival margin must the maxillary major connect be?
5-6mm
How many direct retainers are needed for Kennedy Class III/IV?
4
What Kennedy class doesn’t need indirect retainers?
III
In what Kennedy Class are indirect retainers needed to prevent rotation of extension base?
I/II
What is the min width of the posterior palatal strap major connector?
8mm
Where are indirect retainers placed in relation to the fulcrum line?
as far as possible
What is the min the superior border of mandibular lingual bar needs to be from the gingiva?
4mm, it can be more
Where is the canine rest prep located?
junction of cervical and middle 1/3
What partial is indicated in a pt with limited room?
metal based partial with occlusion constructed in metal
Where does the base attachment and major connector on the maxillary arch need to extend to?
hamular notch
Where is the I bar placed?
Midfacial or slightly mesial to mid facial
Where is a metal tooth used?
In limited spaces, especially the mandibular, where esthetics are not as critical
What should the lingual plate cover?
Cingulum and scallop from contact point to contact point on each tooth.
Never on the marginal gingiva!
What is the posterior tooth selection rule?
Select tooth with slightly steeper cusp than on the pts existing teeth
Thee terminal 1/3 of direct retainer tips should be no higher than, what?
the junction of the cervical and middle 1/3
What is the minimum thickness of the lingual bar?
4mm
What is the best choice for anterior tooth replacement on a RPD?
Facings
What should the width of rest preps be?
1/2 width from cusp tip to cusp tip OR 1/3 the width from buccal surface to lingual surface
What technique is used for a tooth supported RPD reline?
Closed mouth technique
What technique is used for a distal extension RPD reline?
The mouth open holding framework in position
Where is a distal rest not used?
On an abutment next to distal extension
What arch is an altered cast not usually done?
maxillary
When is the best time to select teeth?
Initial or TP appt
What class of mobilities must be extracted before an RPD is made?
Class III mobilities
Where are stops places?
non-occluding cusps
What is the correct depth of an occlusal rest prep?
1.5mm at the marginal ridge
What is the advantage of a wrought wire clasp?
flexible
What should the impression thickness PVS be?
3mm
What needs an undercut of 0.01?
C-clasp
I Bar
Aluminum clasp
What is the undercut needed for a wrought wire clasp?
> 0.01
Where do you reline the baseplate?
on the cast
In what kennedy class do you want occlusion on denture teeth?
IV
What is the number 1 reason for loss of a complete over denture abutment?
periodontal complications
What is the quality of a denture where it resists the vertical forces attempting to dislodge it?
Retention
What is the quality of a prosthesis to be firm, steady, constant and to resist displacement by functional, horizontal, or rotational forces?
Stability
What does the minor connector unite?
Major connector with other parts of RPD (rests, indirect retainers, direct retainers, and base)
What is a direct retainer?
Any unit of RPD that engages an abutment tooth in such a manner as to resist displacement in an occlusal direction
What does the stabilizing component by a reciprocal action resist?
Horizontal stresses placed on an abutment tooth by the retentive arm of the clasp
What is the purpose of the indirect retainer?
Assists the direct retainer in such a manner as to resist rotation of the distal extension of the restoration in an occlusal direction.
What is the purpose of the denture base?
Covers the edentulous ridge and unites artificial teeth to the framework
What do embrasure rests prevent?
wedging of the metal framework.
Name 4 types of maxillary major connectors?
- Anterior-Posterior Palatal Strap
- Palatal Strap
- Palatal Plate
- U-Shaped or Horse-shoe
Name 4 types of mandibular major connectors?
- Lingual bar
- Lingual plate
- Sublingual Bar
- Labial Bar
What direct retainer, is extracoronal, originating from the framework or base and crosses the soft tissue to engage the tooth undercut from a cervical direction?
Bar Type - Roach Clasp
What direct retainer, has an arm that
originates above the height of contour, crosses
the suprabulge, and approaches the undercut
from an occlusal direction.
Circumferential
Where does the I bar engage?
an undercut at the mid facial
Where does a Modified “T” bar engage?
undercut on the distofacial
Where does a Y bar cast clasp engage?
MF and or DF surface of the tooth
When is a ring clasp used?
When an undercut cannot be approached by other means.
Encircles the tooth by ~320 degrees.
What area is a facing usually used for tooth replacement?
Anterior for a short span edentulous area
What is a facing?
Facial surface of a prosthetic tooth OR veneer luted to the retentive metal framework with adhesive.
When is a Tube Tooth used?
Area where span is very narrow and retention is a problem.
If space is insufficient for a tube tooth what must be used?
Metal tooth or facing
Where is a metal tooth used?
In an area where there is not enough space between teeth to place a prosthetic plastic tooth.
What is a butt joint created on the tissue side of the framework, the acrylic resin holds teeth to the framework.
Internal Finish Line
What is a butt joint created on the tongue side of the framework, it is at the junction of the man connector and the base attachment minor connector
External Finish Line
What is the outline of an occlusal rest?
rounded triangle shape 2.5mm in width, 1/3 of buccal to lingual surfaces
What should the angle between the minor connector and the rest seat be?
< 90 degrees
What is the thickness of a rest seat?
1mm thick at its thinnest point
For an occlusal rest how much does the marginal ridge need to be reduced?
1.0-1.5mm
In what kennedy class will you have an extended occlusal rest seat on the posterior teeth to have enough support?
Class II Mod I
Where are rests placed on a medially tipped molars?
Mesial and distal surfaces using a ring clasp
What is the shape of the lingual rest?
Rounded V
width 2.5-3mm
What class of lever is the most destructive (teeter-totter)?
1st Class - RFE
What is the prevention of the sagittal axis rotation?
rigidity or minor and major connectors
What is the prevention of the horizontal axis rotation?
Occlusal rests
Common in Class I or II
What causes vertical axis rotation?
occurs during horizontal rotation during mastication
