CC PROSTHODONTICS 2 2. Lips
3. Cheek
PHYSICAL BIOMECHANICAL
CONSIDERATIONS
- The complete denture prosthesis is a mechanical
object in a biological environment, to ensure the
success of the prosthesis the dentist must
understand the various factors that contribute to its
optimal performance.
Four objectives of Complete Denture
1. Mastication: Denture must be well retained, Comparison between tooth support and
well supported and stable to be able to complete denture support
chew again.
2. Esthetics: Restore natural display of teeth
and gums, lower face height and lip and
cheek fluffines
3. Phonetics: Restore ability to speak clearly
and distinctly
4. Maintenance of Tissue Health:
Maintenance of residual ridge height, health
of oral mucosa and TMJ
Greatest forces acting on teeth:
Vertical direction
1. Mastication
2. Deglutition
Horizontal direction
1. Tongue: Strongest muscle
, Teeth Complete Order 3 High, Well rounded
(Natural) Denture
Order 4 Knife Edged
Support Periodontium Residual Ridge
Order 5 Low, Well Rounded
Cementum Mucosa
Order 6 Depressed
Bone Submucosa
PDL Periosteum
Gingiva Residual Bone
Masticatory 44 lbs 13-16 lbs
Pattern of resorption
Load 20 lbs 6-8 kgs
Area of 45 cm² Maxilla ● Maxilla: Ridge resorbs upward and inward
Support Area of -22.96 cm² ● Mandible: Ridge resorbs downward and
periodontal Mandible outward
ligament in -12.25 cm² ● The end result is that over a period of time
each arch
the maxillary arch become progressively
smaller, whereas the mandibular arch
becomes wider
Residual ridge
● Plays a very important role in complete
Masticatory Load
denture construction
● Complete denture wearers are able to
● Unfortunately, residual ridge undergoes
generate forces that are only 10-15 percent
continuous resorption
of those with natural teeth
● Poorly made, poorly maintained. Or expired
● Forces during swallowing are a little higher
dentures hasten resorption
than the average chewing forces in
complete denture wearers. An average
Six Orders of Residual Ridge Form
person swallows an average of 1000 times
per day
Order 1 Pre Extraction
Forces Generated
Order 2 Post Extraction
3. Cheek
PHYSICAL BIOMECHANICAL
CONSIDERATIONS
- The complete denture prosthesis is a mechanical
object in a biological environment, to ensure the
success of the prosthesis the dentist must
understand the various factors that contribute to its
optimal performance.
Four objectives of Complete Denture
1. Mastication: Denture must be well retained, Comparison between tooth support and
well supported and stable to be able to complete denture support
chew again.
2. Esthetics: Restore natural display of teeth
and gums, lower face height and lip and
cheek fluffines
3. Phonetics: Restore ability to speak clearly
and distinctly
4. Maintenance of Tissue Health:
Maintenance of residual ridge height, health
of oral mucosa and TMJ
Greatest forces acting on teeth:
Vertical direction
1. Mastication
2. Deglutition
Horizontal direction
1. Tongue: Strongest muscle
, Teeth Complete Order 3 High, Well rounded
(Natural) Denture
Order 4 Knife Edged
Support Periodontium Residual Ridge
Order 5 Low, Well Rounded
Cementum Mucosa
Order 6 Depressed
Bone Submucosa
PDL Periosteum
Gingiva Residual Bone
Masticatory 44 lbs 13-16 lbs
Pattern of resorption
Load 20 lbs 6-8 kgs
Area of 45 cm² Maxilla ● Maxilla: Ridge resorbs upward and inward
Support Area of -22.96 cm² ● Mandible: Ridge resorbs downward and
periodontal Mandible outward
ligament in -12.25 cm² ● The end result is that over a period of time
each arch
the maxillary arch become progressively
smaller, whereas the mandibular arch
becomes wider
Residual ridge
● Plays a very important role in complete
Masticatory Load
denture construction
● Complete denture wearers are able to
● Unfortunately, residual ridge undergoes
generate forces that are only 10-15 percent
continuous resorption
of those with natural teeth
● Poorly made, poorly maintained. Or expired
● Forces during swallowing are a little higher
dentures hasten resorption
than the average chewing forces in
complete denture wearers. An average
Six Orders of Residual Ridge Form
person swallows an average of 1000 times
per day
Order 1 Pre Extraction
Forces Generated
Order 2 Post Extraction
