For an Immediate denture the teeth can be replaced in the same position as natural teeth, there are however factors that affect the placement and function

*Remember from first year (Changes due to loss of teeth) 

The two areas of concern:

a)      esthetics

b)      occlusion

a)      Difficulty

·         Over erupted teeth (no opposing teeth)

·         Migration (loss of teeth)

·         Natural teeth in protrusion not desirable to be reproduced (place for better appearance, more compatible to surrounding oral environment

Problem mainly arises when attempts are made to correct mal-related jaws especially Class III or heavy overbite (steep vertical overlap)

b)      Occlusion

·         When it comes to occlusion we find that a lot of research has been done in this part and is still done today. Often the terminology used could be defined differently depending where it was used. Or new terminology was introduced abbreviation, new definition – leading to a lot of confusion.

·         What aggravated the confusion was that occlusal principles for natural teeth were applied to the occlusion of artificial teeth – and we know that the anatomical and physiological aesthetics are not the same.

                                                              i.      With artificial teeth the principles of mechanics and physics are more involved.

                                                            ii.      Complete dentures rest on tissue that is movable and displaceable in varying degree from one mouth to another.

                                                          iii.      Natural teeth are embedded in bone and can move or be displaced only to the degree allowed by the periodontal attachments. Artificial teeth are fixed to a movable base that is capable of moving with tissue and over the tissue – a big difference between these two movements.

                                                          iv.      Natural teeth can act singly or as a unit. Artificial teeth always act as a unit with the entire denture base, in its relation to the supporting tissue is affected.

                                                            v.      Also the fact of the somatic nerve receptors of touch and pressure of natural teeth which are lost (to neuromuscular system) when teeth are extracted.