The soft palate can be classified in to 3 classes. They are
- Class 1
- Class 2
- Class 3
Class 1 soft palate: This kind of soft palate is horizontal and shows small muscular movement. This type of palate is most favourable palate from prosthodontic point of view as it permits more tissue coverage for the posterior palatal seal.
Class 2 soft palate: This type of soft palate makes 45° angle to the hard palate. With this type of soft palate, tissue coverage for posterior palatal seal is less than that of a class 1 type.
Class 3 soft palate: This type of soft palate makes around 70° angle to the hard palate. This type of soft palate provides minimum tissue coverage for posterior palatal seal for complete denture. A ‘V’ shaped palatal vault is usually associated with a class III soft palate. The development of posterior palatal seal needs special attention to hep denture retain at its place while producing “Ah” sound.
The three type of soft palates affect the design of posterior palatal seal while constructing the maxillary complete denture as follows.
In class 1 palate, the PPS will be widest.
In class 2 palate, the PPS will be medium.
in class 3 palate, the PPS will be very narrow.