Midterm Flashcards
The Maxillary ridge resorbs ____ and ____
Superiorly and Medially
or
Vertically and Palatally
- The remaining arch appears to have moved UP and BACK)
The Mandibular ridge resorbs ____ and ____
Inferiorly and Laterally
- The remaining arch appears to have moved DOWN and OUT
Two factors that affect mandibular retention when compared to the maxilla are ____ and ____
- Surface area
- Maxilla = 22.96cm^2
- Mandible = 12.25cm^2 - Muscle insertions
- Makes tissues less stable
The primary stress bearing area of the mandible is the ____
Buccal shelf
The secondary stress bearing area of the mandible is the ____
Residual Ridge
What muscle limits the labial flange?
Mentalis
The bony landmarks of the retromolar region include:
- Retromolar triangle
2. Retromolar fossa
The soft tissue landmarks of the retromolar region include:
- Retromolar papilla
- Retromolar pad
- Pear-shaped pad (only found in edentulous mouth)
What is the desired outcome from an impression?
- Retention - Resistance to movement of the denture away from the ridges
- Stability - Resistance to horizontal and rotational movement
- Support - Resistance to movement in a vertical direction towards the tissue
What is the purpose of bordermolding?
To capture the functional extension of the denture in the vestibular areas as accurately as possible so the final prosthesis can have maximum extension without impinging on the functional movement or intraoral tissues
What three points of reference are necessary in order to make an acceptable face-bow recording?
- External auditory meatus
- Frankfurt horizontal
- Plane of occlusion
The Plane of Occlusion is determined by what three factors?
- The Fox Plane
- 2/3 height of the Retromolar Pad
- Position of the border of the tongue
Occlusion rims act as:
- A vertical stop when making records
- A table to support the recording material
- A means of reliably positioning the master casts on the articulator in the same 3D relationships that exist in the mouth
Excessive VDO will result in:
- Clicking of teeth
- Soreness of ridges
- Muscles tired and strained
- Feeling of excessive bulk
- Unsightly display of denture base and teeth
Insufficient VDO will result in:
- Cheek biting
- Chin jutting forward
- Mandibular lip anterior to maxillary lip
- Angular cheilosis
- TMD problems
What are the two controlling factors of the articulator?
- Inclination of Condylar Guidance
2. Inclination of Incisal Table
The Inclination of Condylar Guidance is obtained with a ____
Protrusive record
The Inclination of the Incisal Table is determined by ____
The vertical and horizontal overlap of the incisors
The greater the horizontal overlap of the anterior teeth, the ____ the inclination of the incisal table
Less
What are some indications for non-anatomic teeth?
- Older individuals with wandering centric position
- Class II ridge relationships
- In reverse occlusion situations (cross-bite)
- Where the patient has lost a great deal of alveolar ridge and the future dentures will have minimal lateral stability
What is the primary method of setting teeth at UNMC?
Lingualized (“Lingual contact”) Occlusion
What are indications for selecting anatomic posterior teeth?
- When dislodgement of the denture will occur during protrusive movements
- When a patient presents with old dentures that had anatomic teeth with balance and desires the same setup
What are some advantages of Acrylic Resin denture teeth?
- Chemically bonds to denture base
- Universal application
- Can be ground readily to accommodate limited inter-arch space
- Less noise when chewing
- Do not fracture easily
What are some disadvantages of Acrylic Resin denture teeth?
- Wear more easily than porcelain
2. Stain more easily than porcelain
What are some advantages of Porcelain denture teeth?
- More resistant to wear
- Lower cost (not a big factor)
- Flat plane posteriors stay sharper for easier penetration of food
What are some disadvantages of Porcelain denture teeth?
- Fracture easily
- Noisy when chewing
- Cannot be used when limited space is available between maxillary and mandibular arches
- Hard to grind
- More shock imparted to fragile tissue
- Does not chemically bond to denture base
- Hard to repair
- Eventual leakage between tooth and resin creating a black or brown line
Physiologic tension (e.g. via natural dentition) results in \_\_\_\_ Non-physiologic compression (as in dentures) results in \_\_\_\_
Apposition
Resorption
Mandibular resorption is ____ the maxillary
4x that of the maxillary
Clinical consequences of complete edentulism include
- Moderate to severe bone loss
- Reduced chewing function
- Poorly fitting dentures and sore spots
- Digestive and Nutritional problems
- Moderate to severe weight loss
Psychological effects of edentulism include
- Premature aging
- Less enjoyment of foods
- Lowered self confidence
- Socially inhibited
- Seldom laugh
- Change in personal relationships
- Poor self image
- Secrecy of oral situation
- Worry, fear, and embarassment
What House classification of patients is most likely to have realistic expectations for their dentures?
Philosophical - rational, sensible, organized
Opposite would be Exacting
Timeline of denture making:
Preliminary impressions + Pour»_space;> Primary cast
Fabricate custom impression trays
Border-mold custom impression trays
Final impressions + Pour»_space;> Master cast
Fabricate record bases (triad) and occlusion rims (wax)
MMR
Mount master cast on articulator + Set teeth
Try-in + Correct arrangement
Process denture in lab
Evaluate surfaces and esthetics
Evaluate fit and eliminate pressure areas/overextensions
Evidence-based dentistry has three major guiding principles
- Best available evidence
- Individual clinical experience
- Patient values
