prostho sheet # 1 - Mohammad Bader

بسم الله الرحمن الرحيم

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Prostho lec. 1_2.doc

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Our lecture today will talk about types of RPD and some classifications.


As you know when we say removable denture, we mean that the patient can put it and remove it whenever he wants. Some treatment maybe removable but the patient can’t remove it from his mouth.
As you know, the dentist doesn’t restore the teeth only because loosing teeth will lead to loosing the supporting bone and soft tissue.

Abutment is a natural tooth which bears the partial denture but it’s NOT part of the partial denture.

There are classifications of edentulous areas, and to understand it, these classifications should be:

• Easy to understand.
• Allow differentiation between tooth/mucosa support.
• Everybody should understand it everywhere.
• Immediate visualization (when anyone says “class 1” you should know what it means immediately).
• Helps in the denture design.


The most famous classification is “Kennedy” which appeared in 1925 and it’s the best classification because it includes all the 5 points I mentioned above.
This classification depends on the relation between the edentulous area and the rest of teeth.

Class 1: edentulous areas bilateral and posterior to standing teeth (bilateral free end saddle).


Class 2: edentulous areas unilateral and posterior to standing teeth (unilateral free end saddle).


Class 3: edentulous area unilateral and has standing teeth anterior and posterior (bounded saddle).



Class 4: same as class 3 but crossing the midline.


Example: if we have a patient that had lost the upper right central and lateral incisors, then he has class 3 classification (not class 4 because it didn’t cross the midline.


Applegate rules:

These rules came as an addition to Kennedy’s classification. The major rules of Applegate are:

1) The most number of teeth lost posteriorly determine the design.
2) Any lost teeth other than the most posterior ones are called “modification area”.
Example: if we have class 2 with lost central incisors we name it “class 2 modification 1” because we have 1 missing area. Other examples are in the handout.

3) all the classes have modifications except class 4 (if we have class 4 with any other area, class 4 will be the modification and the other area becomes the main one”.

Note: - we make classification after extracting all teeth that needs to be extracted.

-if we want to use the 3rd molar we count it in the classification, and if we don’t want to use it we classify as if it is no exist.

For your knowledge: as a human being, we can live and eat normally if we just have the upper and lower 5 (from 2nd premolar left to 2nd premolar right).


Craddock classification:

Class 1: if the denture is supported by teeth.

Class 2: if the denture is supported by mucosa.

Class 3: if the denture is supported by both the teeth and mucosa.


Types of RPD:


1) Definitive (permanent): is usually made of metal (cobalt-chromium) and a little acryl.
2) Temporary: is usually made of acryl only and sometimes some wires.

When to use temporary prosthesis:

1) To help the patient tolerate the denture (make temporary partial denture to patient to try it, then if he is comfortable we make permanent one).
2) Immediate denture : some patients have to extract all teeth, so we give him immediate denture temporarily until we make him a permanent one.
3) If the patient has some teeth and you know that these teeth have to be extracted after months and the patient doesn’t want to extract them all at once.
4) Some patients have an irregular vertical dimension (his face becomes collapsed when closing his mouth) so we make him a temporary partial denture to see if he is comfortable and his face is not collapses…, if everything is fine, then we can make him a permanent denture.
5) Before teeth implantation.
6) If the patient is very young and lost some teeth, we cant make him a bridge (because he has a deciduous teeth or newly erupted permanent teeth with very large bulk) so we make him temporary denture until he gets older.
7) If the patient doesn’t have much time to make permanent denture.
8) If the treatment needs time, we put temporary denture to not let the adjacent teeth move.


Problems of temporary dentures:

• Bulky: it has to be thick in order not to break
• Weak and less rigid (acryl)
• Radiolucent
• Compresses the mucosa and gingival



Types of temporary RPD:

1) Interim: we use it to prepare the patient for the upcoming treatment, or a***mesta3jel patient
2) Transitional: if we have teeth that needs to be extracted regularly (one after the another “so every time the dentist will add to the partial denture”)
3) Treatment: use it if the patient had a surgery or extracted his teeth and want to put denture, so this denture helps in treatment.

The End
Prosthodontics lec.1
8/2/2011

Done By: Mohammad Bader