RPD Manual 11 - Removable Prosthodontics - Dalhousie University

Major Connectors - 35
A vertical stop or rest area must be prepared at each end of the anterior segments of the lingual
plate. This prevents excessive forces being directed facially by movements of the distal
extension
base. Any areas where the connector crosses the gingival tissue must be relieved to prevent
impingement caused by the movement of the lingual plate.
C. Continuous Bar Retainer (Kennedy Bar, Double Lingual Bar)
The connector consists of a lingual bar plus a secondary bar
resting above the cingula of the anterior teeth. The
secondary bar supposedly acts as an indirect retainer and
performs a role in the horizontal stabilization of
periodontally-involved teeth. The performance of these
functions is questionable. Additionally, this major
connector can create a food trap between the two bars. The
use of this type of connector is not encouraged.
D. Labial Bar
Where extreme lingual inclination of the remaining teeth is
present and no reasonable way exists to use a lingual bar
without interfering with tongue movements, a labial bar
may be used. It is essentially similar to the lingual bar and
the same rules apply for its use. Indications for it are
extremely rare. The swing-lock design is a variation of the
labial bar.
II. Maxillary Major Connectors
Major connectors in the upper arch should terminate 4.0 mm or more from the gingival crest
tissues.
A. Anterior-Posterior Palatal Strap
The anterior-posterior palatal strap provides
maximum rigidity and minimum bulk. The strength
of this connector lies in the fact that the anterior and
posterior sections are joined together by longitudinal
connectors on either side. Each component braces
the other against possible torque and flexure. It can
be used in most maxillary partial denture designs and
is especially useful in cases with a torus palatinus.
A variation of the double palatal strap is the anterior-posterior palatal bar connector where the
palatal connector elements are narrower anterio-posteriorly. Due to the narrowness of the
elements, the bars must have greater bulk for rigidity, and thus the design is more objectionable
to the patient. In addition, strap connectors provide greater distribution of stresses to the palatal
tissues since a greater surface area is contacted.