Stability in Complete Denture - topic of Prosthodontics

1. By – Sakshi Joshi
(PCDS & RC)
Stability in
Complete Denture

2. Definition :-
“The quality of a denture to be firm, steady, or constant, to resist
displacement by functional horizontal or rotational stresses”.
- by GPT-9
- Resistance to horizontal or rotational forces.
- Stability provides Physiological comfort to the patient.

3. Occlusal Surface
Cameo Surface And
Associated Structures
Intaglio Surface
● Denture Base
Adaptation
● Importance Of
Mandibular Flange
● Anatomic
Considerations
● Occlusion
● Tooth Position And
Occlusal Plane
● Ridge Relationship
● Muscle Action
● Orofacial Musculature.
● Tongue
● Concept Of Modiolus
● Concept Of Neutral Zone

4. Intaglio Surface Cameo Surface
Occlusal Surface

5. - Residual Ridge Anatomy.
- Vertical Ridge Height.
- Arch Form.
- Palatal Vault.
- Importance of Modiolus.
- Tongue.
Biological
Factors

6. 1. Residual Ridge
Anatomy
Large, square, broad shaped ridges
provide good stability.
2.Vertical Ridge
Height
Residual ridges with adequate/ sufficient
ridge height provide good stability.

7. 3. Arch Form
Square/ tapered arches resist
rotation better than ovoid--
enhancing stability
4. Palatal Vault
Steep palatal vault enhances stability by
providing greater surface contact area and
long inclines approaching right angles to
direction of force

8. Mercury Venus
5. Concept of Modiolus
Area near corner of mouth where 8 muscles converge and separates
labial from buccal vestibule
Denture base must be contoured to permit the modiolus to function
freely.

9. Mechanical
Factors

10. 1. Teeth Position &
Arrangement.
- In the “Neutral Zone” or zone of
minimal conflict.
- Anterior and posterior teeth
should be arranged as close as
possible to the position once
occupied by the natural teeth.
- In case of resorbed ridges, it is
favourable to locate the neutral
zone where the horizontal forces
are balanced.
2. Relationship of opposing
occlusal forces.
-Harmony b/w occlusal surface.
- Balanced occlusion is
simultaneous contact of the
upper & lower teeth.

11. Ma
Mercury
3. Occlusion Plane
- Should be parallel to the
residual ridges.
- Plane of occlusion should divide inter-arch space
equally.

13. Thank you!