Prosthodontics¹

Major Connectors

Functional Characteristics²

Provides rigidity board-exam-question
Unites all other components
Acts as the "chassis" of the framework, uniting all other components like meshwork, minor connectors, and rests into a single unit
Not placed on movable tissue

Placement

The major connector is the thickest central component of the metal partial denture framework and is placed on bounded tissue, such as the palate or the lingual aspect of the mandibular alveolar ridge.

Maxillary Major Connectors

Complete Palatal Plate

Characteristics and Indications

Most rigid maxillary major connector
Indicated when all posterior teeth are missing bilaterally
Used for periodontally compromised teeth, shallow vaults, small mouths, or flat/flabby ridges
most common for kennedy class I

Horseshoe Design

Characteristics and Indications

Least rigid maxillary major connector
Only used if a large palatal torus is present
Thinner than the complete palatal plate
Allows the framework to bypass the torus if the patient does not wish to have it surgically removed

Palatal Strap

Design Requirements

All major connectors should cross the midline at a right angle
Crossing perpendicularly ensures an ideal, rigid design and maintains strength

Beading for Maxillary Connectors

Definition and Purpose³

Exclusive for maxillary major connectors
Involves scribing a 0.5mm rounded groove in the cast at the borders of the major connector
Adds strength and maintains tissue contact to prevent food impaction
Creates a slightly thicker metal border for added strength

Mandibular Major Connectors

Lingual Bar

Characteristics and Indications

Indicated when the depth of the lingual vestibule is ≥7mm board-exam-question
Simplest and most common mandibular major connector
Vestibule depth is measured from the lingual gingival margin to the start of the lingual frenum
This space is required to avoid impinging on the tongue musculature

Lingual Plate

Indications for Use

When depth of lingual vestibule is <7mm
When additional tooth loss is anticipated
Presence of lingual tori
When all posterior teeth are missing bilaterally
Covers more surface area than a bar, potentially offering better support but sometimes less comfort

Labial Bar

Indications for Swinglock Design

Also known as a swing lock design when it includes a hinge on one end and a locking mechanism on the other
When there is a missing canine
Unfavorable soft tissue contour
Questionable periodontal prognosis

Minor Connectors

Primary Function⁴

Connects major connector to rests, indirect retainers, and clasps
Serve as the "branches" from the "tree trunk" (the major connector)

Original PDF page 1: Prosthodontics - 11 - Major & Minor Connectors, p.1 ↩
Original PDF page 2: Prosthodontics - 11 - Major & Minor Connectors, p.2 ↩
Original PDF page 6: Prosthodontics - 11 - Major & Minor Connectors, p.6 ↩
Original PDF page 10: Prosthodontics - 11 - Major & Minor Connectors, p.10 ↩