Un article de Sabine von Sinner

In a total removable prosthesis, the aim of determining the joint between the denture and the palate is to ensure better retention of the maxillary prosthesis in the socket.

For a better understanding, let's first define the joint vélo-palatin: * It is an expansion of the edge of a complete maxillary prosthesis, corresponding to an enregistrement compressif du palais mou à la limite du palais dur, et établissant un contact permanante et ferme avec la muque palatine.

It is therefore a rebord in relief located at the front and inside the prosthesis housing, which ensures the continuity of the prosthesis's peripheral edge and also prevents air and/or nutrients from infiltrating between the prosthesis and the female part supporting it.

This zone is specific to each patient, and depending on the inclination of the voile, the thickness of the tissues at the level of the Schroeder zones, it is up to the practitioner to determine it. On the chair, he will be able to visualize the joint of the vélo-palatinate and transcribe it in the alginate of the primary skin.

The laboratory model allows the technician to prepare an individual port slightly longer than the indicated limit. The aim is to support the material used to register the value and degree of depression of this zone during the functional test. Once the functional calibration has been carried out, the final model is completed and the practitioner proceeds to calibrate the final zone of the bicycle-pallet joint. During the aesthetic assessment, it is important to verify this zone.

Le crayon à l'aniline n'étant plus autorisé, vous pouvez utiliser un marqueur chirurgical ou, preparer un petit mélange eau/oxyde de zinc et l'appliquer avec un pinceau jetable à la limite de la zone de vibration du voile du palais.

Then place the essay in the mouth and check the length of the base of the model. If the grinding has been carried out correctly, there must be permanent contact between the female part and the model and this should be the same as the movements made on the latter. Position statique, déglutition, phonation, " A "prononcé, ...

In the foreground, the line on the opposite side of the joint corresponds to the limit defined by the long and short palette. En bouche, elle se remarque à la différence de couleur de la muqueuse attachée plus rose et la muqueuse libre plus rouge. It is often painted in the shape of a "moustache" and can extend to the level of the Schroeder zone if these allow it. It is advisable for the practitioner to evaluate the contour and the relief.

In order to achieve a perfect grating, it is advisable to use a "Lecron" type instrument and to grate the deeper post-burial zone without exceeding the limit. 

Then grind the intermediate zone in fondu se terminant à la ligne antérieure de forme " moustache ". If this is possible and desired by the practitioner, extend the flow of the grattage in the zones of Schroeder pré délimitées.

On the left and on the right, the grattage ends at the small groove provoked by the hamulus ptérygoïdien.

Sources :

• • Prothèse complète Clinique et Laboratoire. Michel Pompignoli Didier Raux Jean-Yves Doukhan

• • Stratégie Prothétique vol 18 N°2 mise au point. Christophe Rignon Bret

• • lexique des termes de prothèse dentaire. Eveline Batarec

• • Prothèse complète réalité clinique solutions thérapeutique. Olivier Hüe, Marie-Violaine Berteretche.