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Tooth Selection For Partial Denture

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					Tooth Selection For Partial
         Denture


            Dr.Mohammad Al Sayed
                  24/5/2008
             Types of teeth
           1.Acrylic denture base:
Advantages:
1.Good bond with denture base resin.
2.Easily recontoured and polished.
3.May be used with space limited.
4.Reduce wear of opposing restorations and
  natural teeth.
5.Reduce the stresses transferred to the ridge by
  its resilience.
6.Good esthetics.
Disadvantages:
1.Law abrasion resistance.
2.May stain during use.
          2.Porcelain denture teeth
Advantages:
1.Increases abrasion resistance.
2.Increased stain resistance.
3.Natural appearance.
Disadvantages:
1.Abrade the opposing natural and artificial teeth.
2.Cannot be used in close bite cases.
3.More susceptible to fracture.
4.Mechanical bond is required to denture base
  resins.
5.Polishing of ground surfaces is difficult.
6.Clicking during function.
                    3.Facings
In anterior teeth is to be replaced metal packing
with porcelain or resin facing may be used. It is
usually used with metallic denture bases.
Advantages:
1.Metal packing increase strength.
2.Can be used when there is insufficient
   interocclusal space to use resin denture teeth.
Disadvantages:
1.May exhibit flat appearance, lacking of depth.
2.Metal backing may affect shade.
3.Difficulty in fabrication of metal backing due to
  occlusion and articulation.
                     4.Tube teeth:

It is an acrylic or porcelain teeth in the form of a tube have
a channel in its base to fit a post on the metal
framework.
Advantages:
1.Used as a single anterior or posterior tooth replacement,
   where space is available , with good esthetics.
2.No need for flasking and processing the denture teeth.
   The tube teeth are cemented to the metal posts.
Disadvantages:
1.It requires enough space mesiodistally and
   occlusogingivally.
2.It is used with metallic denture base, which cannot be
   relined.
              5.Metal teeth:

Advantages:
1.Can be used where space is limited for
  posterior teeth replacement.
2.Increased resistance to fracture and
  abrasion.
Disadvantages:
1.May be unaesthetic; acrylic or composite
  veneer will improve it.
2.Difficult to adjust occlusion and
  articulation.
Factors affecting selection of RPD teeth:
 1.The size, form and shade should resemble that
   of the remaining natural teeth.
 2.Amount of available space; artificial teeth are
   placed within the available space
   incisogingival and mesiodistal.
 3.Mechanical properties; the anterior teeth
   selection is affected by the opposing
   occlusion, abrasion resistance, resistance to
   fracture, bond strength to denture base and
   ease of adjustment.
 4.Cusp height of opposing teeth; cusp height of the
   artificial teeth should be equal to or slightly
   greater than the opposing teeth.
5.Condition of the supporting tissues in
  distal extension base; if it is poor the
  occlusal forces is reduced by:
a. Using a small teeth faciolingually.
b. Decreasing the number of posterior
   teeth.
c. Space teeth with diastimas.
d. Sharpening of the occlusal surface to
   increase the masticatory efficiency.
e. Using acrylic teeth.

				
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posted:12/1/2011
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