This document summarizes the component parts of removable partial dentures. It discusses the denture base, which is the part that rests on the oral tissues and supports artificial teeth. Common materials used for denture bases include acrylic resin and metallic alloys like cobalt-chrome. The ideal denture base material is accurately fitting, biologically compatible, strong yet lightweight. Acrylic resin bases are easier to repair but weaker, while metal bases are more rigid but difficult to reline. The document also covers denture base extensions and the relationship of the base to abutment teeth.

3. The Component
Parts
of Removable
Partial
Dentures

6. Stages of framework construction from duplicated master cast, through wax
pattern, and finally casting in cobalt, chrome alloy. Note lingual reciprocal
arms on casting to relate the framework to PFM crown castings
Source: Jeff Shotwell, University of Michigan, 2008

7. • Removable
dental
prosthesis
(appliance)
replacing one
or more
natural teeth
and associated
oral structures

8. Types
The Component
Functions
Requirements of an Ideal
Component
Material Used
Special Point
Definition

9. 1-Denture
Base
The Component Parts
of Removable Partial Dentures

10. Definitio
n The Denture
Base Is the
Part of the
Denture,
Which Rests
on the
Foundation
Tissues and
to Which
Artificial
Teeth Are
Attached

12. Definitio
n
It is that part of
the denture,
which rests on
the foundation
tissues and to
which artificial
teeth are
attached .It helps
in transferring
Occlusal
stresses to the
supporting oral
structures

13. • The
Resistance to
Tissue Ward
Movement
Support
• Distribute the Forces Over the Supporting
Sttructure
• Transferring
Occlusal
Stresses to
the
Supporting
Oral
Structures

14. Types of Denture Bases
1-Bounded Partial Denture Bases
2- Free-end Partial Denture Bases
(Distal-extension Base)

15. Components of a Partial Denture

18. Bounded Denture Bases

19. Free-end Partial Denture Bases
(Distal-extension Base)

20. Free-end Partial Denture Bases
(Distal-extension Base)

21. Free-end Partial Denture Bases
(Distal-extension Base)

22. Functions of the Denture Base
3- Provides support
1- Carries the artificial teeth
2- Transfers Occlusal stresses to the supporting
str. stimulation by massage of the tissues
4- Provides denture retention by physical means
5- Provides denture bracing
6- Provides stabilization against tipping of the
distal-extension dentures
7- Prevent Migration and Over Eruption of the
Remaining Teeth

23. Contribute to the functions ofContribute to the functions of
bracing and stabilizationbracing and stabilization

24. Contribute to the functions ofContribute to the functions of bracing andbracing and
stabilizationstabilization

25. 1- Accuracy of adaptation to the tissues
4-Biological acceptability not irritant
Requirements of an Ideal
Denture Base Material
8- Esthetically acceptability
9- Low initial cost ,easy
manipulation
3-Should have low specific gravity,
2-Sufficient strength
5-Potential for future relining
6-Should allow thermal conductivity
necessary for tissue stimulation
7-Can easily be kept clean

26. • Metallic
Denture Base Material

27. Denture Base Material
• Non metal as acrylic resin
A.R.bases attached to metallic denture framework
through metallic minor connectors

28. Denture Base Material
Non Metal As Acrylic Resin
(Temporary Acrylic Removable Partial Dentures)

29. Denture Base Material

30. Metallic denture base
3- Greater Thermal Conductivity
1- More Rigid Than Resin Bases
Even in Thinner Section
2- Less Bulky
4- Fit More Accurately to d Underlying
Tissues
5- More Hygienic as the fitting surface
is Polished and non-porous with less
Tendency for Food Accumulation
Advantages

31. Disadvantages of Metal Bases
3- The Colour of Metal Bases
Does Not Simulate the Natural
Appearance of Oral Tissues
1-Difficult to Rebase or Reline
When Ridge Resorption Occurs
2- Difficult to Repair

32. Used in thinner section than resin bases
*chrome coblt alloy
*cast gold alloy
*stainless steel

33. *chrome cobalt alloy
Used in cast form
Rigid even in thin section
Has low specific gravity (1/2) that of gold
Provide high resistance to corrosion
Not easily abraded
Attain high polish surface
Dimensionally stable
Special machine for casting &polishing
Special investment& high casting temperature

34. Cast gold alloy
Less rigid than chrome cobalt alloy &
more rigid than resin
More heavier than chrome cobalt alloy
Used in lower partial denture to aid in retention

35. Stainless steel
Used in swage form
Less accurate than chrome cobalte or gold alloy
Less commonly used

36. Indications;
Tooth supported partial denture
Inadequate intermaxillary space

37. Non-metallic, Acrylic Resin
Denture Bases
3- Easy to Reline, Rebase or
Repair
1- Eesthetically is Satisfactory
due to Its Pink Colour
2- Light in Weight
4- Needs Simple Processing
Procedures
Advantages

38. Disadvantages of Resin Base
1- Weak, Have Low Tensile
Strength, Brittle And Are Liable
To Fracture
2- To Attain Enough Strength, Resin
Bases are Made Bulky
3- Have Low Thermal Conductivity
4- The fitting surface is porous and
not polished bad oral hygiene,
bad odour and inflammation of
the tissues

39. INDICATIONS OF RESIN BASE
1- Free-end Saddle Cases
2- Increased Rate of Bone Loss As
Diabetic Patients or Patients on
Steroid Therapy
3- Cases With Extreme Bone Loss. The
Presence of Acrylic Resin Is
Necessary to Restore the Original
Contour

40. Indications:
Extension base partial denture
Long span edentulous ridge
Future relining is anticipated in a short time
resin restore contour much more satisfactory than metal

41. *support is an important consideration in designing saddles
for extension base saddle
*support obtained from underlying structure as residual
ridge, buccal shelf, palate pear shaped pad
*maximum coverage without encroaching on movable tissue
To reduce stress on the abutment teeth
*need for future relining
*when denture cross gingival tissur it should be relieved to
avoid the impinge on gingival tissue which cause irritation
& periodontal damage.

42. Denture Base Extension
1- Buccally
2- Lingually
3- Posterior Limit
4- Anterior Limit

43. Denture Base Extension

44. Denture Base Extension

45. Denture Base Extension

46. Max. Denture Base Extension

47. Relationship of Denture Base
to Abutment
1- Close contact
2- Open Contact

55. Denture Base Extension

56. Finishing line

57. Finishing line

58. Finishing line

59. Finishing line

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