MAJOR CONNECTORS. DEFINITION. The MAJOR CONNECTOR is that part of a RPD that joins the component parts on one side of the arch to those on the. Major Connectors. BDS III year. RPD Lecture. Timing- PM. Dr Deeksha Arya . Associate Professor. Department of prosthodontics. Components of a typical. Major Connectors IN RPD – Download as Powerpoint Presentation .ppt /.pptx), PDF File .pdf), Text File .txt) or view presentation slides online. DENTISTRY-.

Retention was obtained on terminal abutments. If a lingual bar alone is to be used anteriorly, there is no reason to add an apron elsewhere. This is considerably greater than the intrusion exhibited by abutment teeth, at approximately 0. After 5 minutes, processing material BT 70, Beta Proses was applied and left for 20 minutes.

The basic form of a mandibular major connector is a half-pear shape, located above moving tissue but as far below the gingival tissue as possible. The principle of leverage is connected with this component part.

The upper border should follow the natural curvature of the supracingular surfaces of the teeth and should not be located above the middle third of the lingual surface, except to cover interproximal spaces to the contact points. For each patient, three sets of dentures with the different major connectors under study that is metal palatal bar, metal palatal plate and acrylic plate were fabricated. Microscopic cracks were seen in major connectors showing the highest degree of deformation and located at the depth of the hard palate.

Model 2—full palatal plate in class I Fig. Published online Dec Selection of the type of connector is based on four factors: This special point showed the highest deformation in the palatal strap major connector.

Model 6—class IV—anteroposterior palatal strap load application. Then, photographs were taken using the light of a W ultraviolet lamp Tiede. Posterior plastic denture teeth simulating the teeth on the original standard models were selected and set. Photographing procedures were carried out both before baseline and after each loading period, and the black-and-white film was developed with Kodak solution for the photogrammetric film process stereophotographs.

At the same time, because of its anterior location, the cross-sectional area is not affected as much as in the palatal plate and palatal strap major connectors during the waxing stage; therefore, it is placed third in decreasing order of deformation amount. The developments in mainframe and availability of powerful microcomputers have brought this method within the reach of students [ 5 ].

Major connectors should be designed and located with the following guidelines: The superior border of a lingual bar connector should be tapered toward the gingival tissue superiorly, with its greatest bulk at the inferior border, resulting in a contour that has a half-pear shape.

Major Connectors. – ppt video online download

When well adapted, this form will benefit from some anterior teeth acting together to help resist rod rotational tendencies of the prosthesis, especially if the posterior ridge form does not resist such movement. The combination anterior-posterior connector design may be used with any Kennedy class of partially edentulous arch.

A rigid plate including evenly spaced lines in 1-cm squares and photogrammetric control points of different heights, and a denture holder prepared from thermoplastic material were used to take photographs. Since biology is not a compatible entity, though FEA provides a sound theoretical basis of understanding the behavior of a structure in a given environment, it should not be considered alone.

Finite element method accommodates complex geometry with ease and is capable of handling non-linear and time dependent system also. Questions yes Not sure No Did any of the dentures interfere with speaking? But as a U-shaped plate major connector covers the inclined surfaces, it can only resist a very small part of the chewing force.

Study of Deflections in Maxillary Major Connectors: A Finite Element Analysis

Taking into consideration, the class I situation deflections were studied in two maxillary major connector designs. It is through this cross-arch tooth contact, which occurs at some distance from the functional force, that optimum resistance can be achieved.

After microcrack evaluations, it was seen that there were microcracks in both the palatal plate and palatal strap major connector groups Fig 4b.

The double-strap type of major connector provides the maximum rigidity without bulk and total tissue coverage. Therefore, during the waxing stage there must be no sudden changes in the sectional thickness, especially on the midpalatal depth, to avoid very thin places and protect the rigidity of the major connectors.

The line connecting marks indicates the location of the inferior border of the major connector. When the types of major connector were separately evaluated according to the difference of deformation between the posterior median point and the junction points of the posterior connecotrs with manor, no statistical difference was observed with the U-shaped plate major connector Table 1.

Both the linguoplate and the cingulum bar ideally should have a terminal rest at each end, regardless of the need for indirect retention.

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