Name: Asmaa Ahmed Mostafa
ID: 231020094
Assignment RPT
Enumerate
Q1- Types of Rests According to Location and
Function:
1. Occlusal Rest
• Location: On the occlusal surface of posterior teeth.
• Function: Prevents vertical displacement of the prosthesis and
directs forces along the long axis of the abutment tooth.
2. Lingual (Cingulum) Rest
• Location: On the lingual surface of anterior teeth, typically on a
cingulum.
• Function: Provides support in anterior teeth and directs forces
toward the long axis of the tooth.
3. Incisal Rest
• Location: On the incisal edge of anterior teeth.
• Function: Acts as a direct retainer and provides support.
4. Marginal Ridge Rest
• Location: Positioned along the marginal ridge of a tooth.
• Function: Used when preparing for a proximal guide plane to
enhance stability and support.
Q2- Factors Affecting the Effectiveness of Indirect
Retainers:
Effectiveness of the direct retainers
Proper location of indirect retainers
Effectiveness of the supporting structures
Rigidity of the denture frame
Q3- Indications of Embrasure Clasp:
Used on the dentulous side of unilateral edentulous (class II, III)
cases having no modifications, class IV.
Provide bilateral stabilization, and bracing, in addition to
retention.
It also splints the two teeth
Q4- Clasps with a Splinting Effect:
Double Aker clasp
Extended arm clasp
Multiple Aker clasp
Q5- Factors Determining the Retentive Force of a Clasp:
Amount of undercut used
Angle of approach
Flexibility of clasp arm
Give a reason of
Q1- The angle between the minor connector and the
rest should be less than 90°
To direct the forces along the long axis of the tooth
Q2- The Lingual Rest is Preferable to an Incisal Rest
Placed closer to the center of rotation of the abutment tooth
Q3- Class IV Kennedy Classification Has No
Modifications
Because if there is a posterior edentulous area beside the anterior one, the
former will determine the class and the anterior edentulous area will be a
modification to the class
Q4- Casting is done on a refractory cast
Because it is capable of withstanding the high temperatures and thermal
shock involved in the casting process. Refractory materials, such as ceramic
or special heat-resistant materials maintain their shape and structural
integrity when exposed to the molten metal or material being cast. This
ensures accurate reproduction of the desired shape and prevents distortion
during the casting process.
Q5- The use of indirect retainer
Prevents Dislodgement.
Improves Stability
Protects Soft Tissues
Maintains Proper Position
Q6- Retentive clasp arm should be passive at rest
Provides unilateral bracing commonly used for tooth mucosa
borne partial denture
To remain in contact with the tooth ready to resist vertical
dislodging
Q7- An axillary rest is used in ring clasp
Prevents Tooth Tipping
Enhances Stability
Distributes Forces
Improves Retention
Q8- Beading of maxillary major connectors
Prevents Food Accumulation.
Enhances Tissue Contact
Compensates for Casting Shrinkage
Improves Patient Comfort
Defines the Borders
Preventing over growth of the palatal tissues
one main function of
Q1- Minor connector
Connect different units with saddle or major connector.
Transfer the effect of the connected components to the other
parts of the denture.
Transfer functional stress to the abutment teeth.
Provide bracing and sometimes reciprocation.
Q2- lingual bar
As a major connector: It does not provide neither support nor indirect
retention.
Q3- Terminal rests of a lingual plate
To provide stability, support, and resistance to movement. These rests
are typically placed on the mesial or distal occlusal surfaces of
abutment teeth.
Q4- Reciprocal arm
Provides unilateral bracing commonly used for tooth mucosa borne
partial denture
Q5- Undercut gauges of surveyor
To measure the amount of horizontal undercut for correct positioning of
retentive arm
Q6-Retentive arm of the clasp
Engages a portion of the tooth surface and either enters an undercut
for retention or remains entirely above the height of contour to act as a
reciprocating element,
Q7- Guiding planes
Maintain retention and stability for RPDs, eliminate harmful stresses to
abutment teeth, and avoid significant food traps between the
abutment teeth and prostheses
Q8- Occlusal rest
The angle between the minor connector and the rest should be less
than 90
