1 Flashcards
THE DENTURE’S THREE SURFACES
• Intaglio or fitting
• Polished
• Occlusal
Attaches the teeth to the bone of the jaws
PERIODONTIUM
Provides a resilient suspensory apparatus resistant to
functional forces
PERIODONTIUM
• Hard connective tissues and soft connective tissues
• Allows the positions of the teeth to change in response to
stress
PERIODONTIUM
a poor substitute compounded by the demise of periodontal ligament with its support and
sensory functions.
Residual ridges
Occurs about 500 times a day
A. DEGLUTITION
B. CHEWING
C. Both
DEGLUTITION
Longer duration of tooth
contacts
A. DEGLUTITION
B. CHEWING
C. Both
A
Restricted to short periods
during the day
A. DEGLUTITION
B. CHEWING
C. Both
B
Shorter duration of tooth
contacts
A. DEGLUTITION
B. CHEWING
C. Both
B
Greatest forces acted on the
teeth
A. DEGLUTITION
B. CHEWING
C. Both
C
Vertical in direction
A. DEGLUTITION
B. CHEWING
C. Both
C
CHEWING
1. Actual chewing time per meal ___
- Four meals per day ____
- One chewing stroke per day ___
- Duration of each stroke ___
- Total chewing forces per day ___
- 450 sec
- 1800 sec
- 1800 day
- 0.3 sec
- 540 sec (9 min)
SWALLOWING MEALS
- Duration of one deglutition ____
- During chewing, three
deglutition per min, one third
with occlusal force __
1 sec
30 sec (0.5 min)
BETWEEN MEALS
- Daytime 25/hr (16 hr) __
- Nighttime 10/hr (8 hr) ___
- Total __
- 400 sec (0.6 min)
- 80 sec (1.3 min)
- 1050 sec = 17.5 min
Mucosal support for denture
- edentulous maxillae
- edentulous mandible
- 22.96cm2
- 12.25cm2
Periodontal ligament support for dentate
____ in each dental arch
45 cm2
Loss of sensory mechanism
RESIDUAL RIDGES
Serves as the foundation for dentures, a role which they
are ill-suited.
RESIDUAL RIDGES
T/F
RESIDUAL RIDGES
• Denture supporting tissues demonstrate very little
adaptation to their new functional requirements.
• Subject to ongoing resorption resulting to gradual
reduction or virtual disappearance.
T
Most rapid resorption in the anterior of the mandible
RESIDUAL RIDGES
T/ F
RESIDUAL RIDGES
Shapes will become altered, an
T
MUSCULAR FACTORS IN DENTURE RETENTION
- Buccinator
- Orbicularis oris
- Intrinsic and extrinsic muscles of tongue
WHAT REGULATES MANDIBULAR MOVEMENTS?
Reflex mechanisms with receptors in the
• Muscles
• Tendons
• Joints
• Periodontal structures
BASED ON THE TYPE OF MOVEMENTS
- Hinge movement
- Protrusive movement
- Retrusive movement
- Lateral movement
OCCLUSION: FUNCTIONAL AND PARAFUNCTIONAL
CONSIDERATIONS
Components:
- The Dentition
- The Neuromuscular System
- Craniofacial Structures
T/ F
Masticatory system operates best in an environment of continuing
functional equilibrium.
T
CR –
MIP –
Centric Relation
Maximum Intercuspation
T/F
PROSTHETIC DENTAL OCCLUSION
• Complete dentures are designed so that their occlusal
surfaces permit multidirectional contact movements of the
maxillary.
PROSTHETIC DENTAL OCCLUSION
• Complete dentures are designed so that their occlusal
surfaces permit multidirectional contact movements of the
MANDIBLE.
T\ F
PROSTHETIC DENTAL OCCLUSION
Arrangement of the artificial teeth to occupy a so called
“neutral zone” that determines the functional balance of
the orofacial and lingual musculature.
T
Rhythmic separation and apposition of the
jaws and involves biophysical and biochemical processes.
Mastication
FUNCTION: MASTICATION AND OTHER MANDIBNULAR
MOVEMENTS
Facilitates swallowing and digestion of carbohydrates by
___.
amylase
FUNCTION: MASTICATION AND OTHER MANDIBNULAR
MOVEMENTS
Masticatory efficiency of ___ is adequate for complete
digestion of foods.
25%
CHANGES IN THE MORPHOLOGICAL FACE, HEIGHT, AND TMJ
• ___years of age-final stage of skeletal growth occurs
• Growth and remodeling continue well into adult life and
account for dimensional changes in the adult facial
skeleton
20-25
CHANGES IN THE MORPHOLOGICAL FACE, HEIGHT,
AND TMJ
Changes in the maxilla and mandible occurs __
depend on the balance of osteoclastic activity
Slowly
T\ F
Resorption of the alveolar ridges causes reduction int eh
vertical dimension of occlusion.
T
TMJ CHANGES
CAUSES OF ____
TEMPOROMANDIBULAR DISORDER (TMD)
→ impaired dental efficiency–tooth loss
→ inappropriate prosthodontic treatment
→ absence of prosthodontic treatment
TEMPOROMANDIBULAR DISORDER (TMD)
T/ f
Fabrication of new complete denture can reduce and
stabilize TMD signs and symptoms.
T
T\ f
ESTHETIC CHANGES
→ tooth loss adversely affects a person’s appearance
→ patient’s weight loss
→ age
→ heavy tooth attrition
T
MORPHOLOGICAL CHANGES ASSOCIATED WITH THE
EDENTULOUS STATE
• Deepening of nasolabial groove
• Loss of labiodental angle
• Decrease in horizontal labial angle.
• Narrowing of lips
• Increase in columella-philtral angle
• Prognathic appearance
Direction::
Mainly vertical
A. Mastication
B. Parafunction
A
Direction:
Frequently horizontal and vertical
A. Mastication
B. Parafunction
B
Duration and magnitude:
Intermittent and light
Diurnal only
A. Mastication
B. Parafunction
A
Duration and magnitude:
Prolonged, possibly excessive
Both diurnal and nocturnal
A. Mastication
B. Parafunction
B
