The document discusses minor connectors in partial removable dental prostheses, detailing their functions, types, and various specifications. It outlines their role in joining components of the prosthesis, ensuring stability, and transferring functional stress to abutment teeth, as well as the characteristics required for effective design. Additionally, it covers different types of rests, including occlusal, lingual, and incisal rests, and their specific preparations on abutment teeth.

1. ANILA SHAH
BDS FINAL YEAR

2. MINOR CONNECTOR
 The connecting link between the major connector or
base of the partial removable dental prosthesis and
other units of prosthesis , such as the clasp assembly
,indirect retainers , occlusal rests ,or cingulum rests

3. TYPES
 Join clasp assemblies to the major connectors
 Join denture bases to the major connectors
 Join indirect retainers or auxillary rests to the major
connectors
 Serve as approach arms for bar type clasp

4. types
 Join clasp assemblies to the major connectors

5.  Join denture bases to the major connectors

6.  Join indirect retainers or auxillary rests to the major
connectors

7.  Serve as approach arms for bar type clasp

8. Functions
 Joining other units of prosthesis and dentures bases to
the major connector.
 Prosthesis to abutment function . Transfer functional
stress to the abutment teeth .
 Abutment to prosthesis function of minor connector .
Transfers the effects of retainers , rests , and stabilizing
components throughout the prosthesis.

9. Forms and location
 Sufficient bulk to be rigid
 Minor connector contacting axial surface of abutment
teeth should not be located on convex surface , instead
should be located on the embrasure.
 Should conform to the interdental embrasures.


10.  Should be thickest towards the lingual
surface , tapering towards the contact
area
 Deepest part of interdental
embrassure should have been blocked
out to avoid interference during
placement and removal.

11. 
 Minor connector should be wide
enough to use the guiding plane to the
fullest advantage.
 When it gives rise to clasp arm it
should be tapered.
 Bar clasp –tapered to the knife edge

12. modification
Minor connector located in the center of
the palatal surface of the maxillary
abutment tooth.
Reduces the amount of tissue coverage
Provides enhanced guidance for the
partial denture during insertion and
removal .
Increases stabilization against
horizontal and rotational forces

13. drawback
 Greater potential space for food entrapment

14. Tissue stops
 Cast stop/tissue stop/processing stop placed at the
posterior of the minor connector
 Provide stability to the framework during packing and
processing the acrylic resin
 Prevent distortion of the framework during acrylic
resin processing

15. Finishing lines
 Junction of minor connector with major connector
 Is a butt joint
 It should not be greater than 90 degree

16. REST
 It is that part of the partial denture which rests upon
the rest seat on the tooth surface and provides vertical
support to the denture.
 RESTS SEATS:
The prepared surface of an abutment to receive the rest
is called rest seat.

17. Classification of rests
 PRIMARY REST :
 is a rest that is part of retentive clasp assembly.
SECONDARY OR AUXILIARY REST :
Is one that is used for additional support or indirect
retention.

18. types
 1. Occlusal rest—On posterior teeth.
 2. Lingual rest—On the lingual surface of anterior
 teeth.
 3. Incisal rest—On the incisal edge of an anterior
 tooth

21. FUNCTIONS
 1. Prevent vertical displacement of the denture
 towards the soft tissues.
 2. Transfer the load of the mastication to the natural
 teeth.
 3. Prevent occlusal imbalance.
 4. Retain clasps in their correct position.
 5. Prevent food packing between denture and natural
 teeth.

23. OCCLUSAL REST
Location: Mesial or Distal fossa of molars or premolars
 Outline :Round or triangular shape with apex near
 the center of the tooth.
 Width- 2.5mm
 Depth 1.5mm
 Floor of the seat concave or spoon shape with
inclination towards the center of the tooth.

24. requirements
 Rest must fit tooth rest seat accurately to prevent food
collection.
 Should be strong to take-up load of mastication.


25.  The angle formed by occlusal rest and vertical minor
connector should be <90 degree

26. Extended occlusal rest
 Kennedy’s class II and class III situations .
 An extended occlusal rest should be designed &
prepared to minimize further tipping of the abutment.


27.  Rest should extends more >1/2 of mesiodistal width
 = one thirds the buccolingual width of the tooth
 & should allow for a minimum of 1mm thickness of the
metal,
 the preparation should be rounded with no undercuts or
sharp angles.
 If abutment is severely tilted the extended occlusal rest
may be in form of onlays .

28. Interproximal occlusal rest
 They are prepared as an individual occlusal rest seats
except that the preparation must be extended further
lingually than an ordinarily accomplished .
 Used to avoid interproximal wedging
 Additionally the joint rests are designed to shunt food
away from contact points. .

29. Lingual rests
 Cingulum rest
 Ball rest

30.  Location: On canines and Incisors.
 Indications
 a. Where anterior tooth is the only abutment available
 for occlusal support.
 b. To support indirect retainer.
 c. As an extra rest.

31.  A rounded inverted V shape preparation ( the apex of
V is directed incisally
 The most satisfactory lingual rest is one that is placed
on a prepared rest seat in a cast restoration .
 This is done most effectively by planning and
executing a rest seat in the wax pattern rather than by
attempting to cut a rest in a caste restoration in the
mouth .

32. Incisal rest
 A rigid extension of RPD placed at
the incisal angles of anterior teeth
on prepared rest seats.
 Commonly used as an auxillary or
indirect retainer
 More applicable on the mandibular
teeth , due to lack of inadequate
thickness of enamel on the lingual
surface .

33. Preparation of rest seat
 In the form of rounded notch at the incisal angle
 Deepest preparation apical to the incisal edge
 The notch should be beveled on both facial and
lingual surfaces.
 2.5mm wide 1.5mm deep