Major And Minor Connectors
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Major And Minor Connectors

Major And Minor Connectors

Removable Partial Denture

MAJOR & MINOR CONNECTORS

major and minor connectors

Components of a typical Removable Partial Denture are:

1. Major connectors,

2. Minor connectors,

3. Rests,

4. Direct retainers,

5. Stabilizing or reciprocal components (as parts of a direct retainer assembly),

6. Indirect retainers (if the prosthesis has one or more distal extension bases),

One or more bases, each supporting one to several replacement teeth.



 

MAJOR CONNECTORS

Rpd Of Maxilla

DEFINITION - A major connector is the component of the partial denture that connects the parts of the prosthesis located on one side of the arch with those on the opposite side.

- It is that unit of the partial denture to which all other parts are directly or indirectly attached.


FUNCTIONS:

- The chief functions of a major connector include

  1. Unification of the major parts of the prosthesis,
  2. Distribution of the applied force throughout the arch to selected teeth and tissue, and
  3. Minimization of torque to the teeth.

{NOTE: The principle of leverage is connected with this component part. A rigid major connector will limit movement possibilities by acting as a counteracting lever. This phenomenon is referred to as CROSS-ARCH STABILITY. Cross-arch stability becomes more important in situations associated with high potential for greater prosthesis movement (e.g., distal extensions).}


LOCATION:

Major connectors should be designed and located with the following guidelines in mind:

1. Major connectors should be free of movable tissue.

2. Impingement of gingival tissue should be avoided.

3. Bony and soft tissue prominence's should be avoided during placement and removal.

4. Relief should be provided beneath a major connector to prevent its settling into areas of possible interference, such as inoperable tori or elevated median palatal sutures.

5. Major connectors should be located and/or relieved to prevent impingement of tissue that occurs because the distal extension denture rotates in function.


TYPES OF MAJOR CONNECTORS

MAXILLARY MAJOR CONNECTORS

1. Single palatal bar

2. Single palatal strap

3. U-shaped palatal connector

4. Anterior-posterior palatal bars

5. Combination anterior and posterior palatal strap-type connector

6. Palatal plate-type connector


MANDIBULAR MAJOR CONNECTORS

1. Lingual bar

2. Sublingual bar

3. Lingual bar with cingulum bar (continuous bar)

4. Cingulum bar (continuous bar)

5. Linguoplate

6. Labial bar

 

 

Single palatal bar
Lingual bar
Single palatal strap



MINOR CONNECTORS

 

 

Definition- Components that serve as the connecting link between major connector or base of a removable partial denture and other components of the prosthesis, such as the clasp assembly, indirect retainers, occlusal rests, or cingulum rests.

For example, An occlusal rest at one end of a linguoplate is actually the terminus of a minor connector even though the minor connector is continuous with the linguoplate. The portion of a partial denture frame work that supports the clasp and occlusal rest is a minor connector. Portion of removable partial denture frame work that retain the denture bases are also minor connectors.


FUNCTIONS:

In addition to joining denture parts, the minor connector serves two other purposes.

1. Transfers functional stress to the abutment teeth. This is a prosthesis-to-abutment function of the minor connector.

2. Transfers the effects of the retainers, rests, and stabilizing components throughout the prosthesis. This is an abutment-to-prosthesis function of the minor connector.


TYPES OF MINOR CONNECTOR

I. Join the clasp assembly to the major connector.

II. Join direct retainers or auxiliary rests to the major connector.

III. Join the denture base to the major connector.

IV. Serve as an approach arm for a vertical projection or bar type.

 



TISSUE STOPS

Tissue stops are integral parts of minor connectors designed for retention of acrylic-resin bases.

Role of Tissue Stops

-They provide stability to the framework during the stages of transfer and processing.

- They are particularly useful in preventing distortion of the framework during acrylic-resin processing procedures.

- Tissue stops can engage buccal and lingual slopes of the residual ridge for stability.

- Altered cast impression procedures often necessitate that tissue stops be augmented subsequent to the development of the altered cast. This can be readily accomplished with the addition of autopolymerizing acrylic resin.

{Another integral part of the minor connector designed to retain the acrylic-resin denture base is similar to a tissue stop but serves a different purpose. It is located distal to the terminal abutment and is a continuation of the minor connector contacting the guiding plane. Its purpose is to establish a definitive finishing index tissue stop for the acrylic-resin base after processing.}


VIDEO LINKS

1. https://youtu.be/cTwV1Q6N-YY

2. https://youtu.be/w6bGZzo2yeA


REFERENCES

1. McCracken's Removable Partial Prosthodontics (Twelfth Edition)

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