1/2 Overview of CD & The Edontulous Challenge Flashcards
What is resistance to vertical movement of the denture base toward the ridge?
Support
What is resistance to horizontal or rotational movement?
Stability
What is resistance to displacement of the denture base away form the ridge?
Retention
What is attraction between unlike molecules?
Adhesion
What is force between molecules of same material?
Cohesion
What is a thin fluid film between 2 closely contacting objects?
Interfacial surface tension
What is impression technique affects?
Intimate tissue contact
What prevents ingress of air?
Border sesal
What is a learned phenomenon?
Neuromuscular control
What do external contour of denture bases promote?
Neuromuscular control
What is the size of natural dentition?
45 cm^2 in each arch
What is the maxillary and mandibular size of complete dentures?
Max: 23cm^2
Mand: 12cm^2
What are patient classifications?
Philosophical
Exacting/critical
Hysterical
Indifferent
What are things to take note of during an intraoral exam?
Mucosa - color, contours
Basal seat - height, contour, ridge parallelism, palatal vault shape
Arch form - square, tapening, ovoid
Interarch space
What does border molding allow for?
The intraoral soft tissues to form the length, width, and shape of custom tray borders prior to making the secondary impression
What do artificial teeth rest on?
Mucous membranes
What does pressure on mucosa cause?
Soreness and resorption
What do complete dentures move in relation to?
The underlying bone during function
More movement = more soreness and resorption
What are the causes of denture movement?
- resiliency of tissue
- instability of the dentures
Almost all the “principles” of complete denture fabrication have been formulated to _____________ or __________ transmitted to the supporting structures
decrease movement; minimize the forces
In the edentulous state, there are _____ natural adaptive mechanisms left
Few
What type of tissue do dentures rest on?
Tissue that changes progressively and irreversibly
What is resistance to vertical movement toward the underlying tissues?
Support
What provides support in natural dentition?
Dentin - cementum - PDL - alveolar bone
What is the size of PDL in each arch?
45cm^2
What is the mean size of the denture bearing areas?
Max: 23cm^2
Mand: 12cm^2
*decreases as ridges resorb
What is Wolff’s law?
Living bone responds to functional stress by depositing bone in areas of stress
Edontulous patients have very little adaptation to?
Functional stress on alveolar bone
Wearing of dentures is almost always accompanied by?
An undesirable loss of bone
In complete denture wearers, the mean reduction in anterior mandibular ridge is _____ times that of the maxillary ridge
4
How to reduce pressure on residual ridges?
Remove dentures at least 8hrs/day & proper impression techniques
What are proper impression techniques?
- record tissues at rest
- extend denture base to use maximum support area
- placement of pressure on those tissues best able to tolerate pressure
There is no contact of anterior teeth in?
Centric relation closure
What reduces occlusal discrepancies?
Clinical remount and equilibraiton at delivery
What is not a static tissue and is constantly being remodeled/replaced?
Bone
Describe the bone of the maxillary ridge?
Partly covered by a layer of cortical bone after teeth are extracted
Describe the bone of the mandibular ridge?
Crest remains spongy, trabeculated and not very resistant to resorption
What is the primary denture support area on the mandibular arch?
Buccal shelf (compact bone)
What principle is regarding the decrease of pressure per unit area by extending the denture base to cover the maximum area within physiological tolerance (support)?
Snowshoe principle
More saliva contact =
more contact adhesion (retention)
Proper peripheral extension =
Good border seal (retention)
What is resistance to dislodgement/resistance to movement away from the foundation?
Retention
The quantity and quality of this affect denture retention
Saliva
What is xerostomia?
Dryness presents much difficulty for denture wearers
What does xerostomia lead to?
discomfort, ulcerations, retention loss, chewing problems
What is the attraction of unlike molecules for each other?
Adhesion
What is the amount of retention attributable to adhesion directly proportion to?
Wettability of the denture base material to the area covered by the denture base and to the viscosity of the saliva
What is resistance to movement in the horizontal plane/resistance to rotation/resistance to lateral movement?
Stability
What are factors that influence stability?
- Shape of alveolar ridges
- Size of alveolar ridges/vestibular depth
- Flange length and shape
- intimate fit of prosthesis
What is the need for edentulous in at least one arch?
36 million
How many complete dentures are done each year?
5.5 million
If you smoke, you are ______ more likely to be edentulous
3x
Average general practice in USA has ______% of gross $$ from partial and complete edentulism?
27%
What is often regarded as substitute treatment for expensive restorative therapy, periodontal therapy, or for an unesthetic dentition?
Complete dentures
What is known as the technicians feeling they should he allowed to bypass the dentist and deal directly with the public?
Denturism
What is our goal as described by Dr. M.M. Devan?
Not the meticulous replacement of that which is missing, but the preservation of that which remains
What did Dr. J. Brudvik state?
Only through the meticulous replacement of that which is missing can we hope to preserve that which remains
What is the 3 step process of complete dentures?
- Diagnosis
- Treatment planning
- denture fabrication
Dentures do not cure _______
Edentulism
Dentures are not ________
substitutes for natural teeth
Denture are substitutes for _______
No teeth
What plays a substantial role in overall complete denture success?
Patients’ personality and relationship with the dentist
