6 study and diagnostic cast Flashcards
A negative likeness of the surface of an object
Impression for tray selection
The resultant of the negatuve likeness of the surface of an object
Study cast
Made with the use of rim lock trays and irreversible hydrocolloids, such as alginate
Impresison for tray selection
Limiting structures are marked with?
Lead pencil
What to do with the stock tray fabricaton
Follow the marked borders of the study cast to cut and recontour the stock tray
Borders of the trays should be smoothened with sand paper to avoid soft tissue lacerations and trauma to the patient
What is the resultant cast of preliminary impression?
Diagnostic cast
Positive registration of the edentulous mouth
Alow for an evaluation of anatomy in the absence of the patient
Diagnostic cast
An individualized impression tray made from a cast removed from a preliminary impression
Individual tray “custom tray”
Must extend as far as possible without interfering in the health or function of the tissues
Denture base outline
Second internal outline which is drawon on the cast
- it is about 1mm short of the denture outline, following its contour and extension
Tray outline
Area where tissue stops are placed
First premolar area and first molar area on the opposite
Purpose: provide adequate space in the tray for the final impression material
Wax spacer
Purpose: for the individual trauy to provide adequate support for the final impression
Mark of palatal apron
Purpose: to avoid breakage of case or the tray
Block undercuts with melted pink wax
In mixing the acrylic, the resin material is rolled like a sausage and flattened between 2 lubricated glass slab.
Lower individual tray
In mixing the acrylic, the mixed resin is rolled like a ball, flattened between 2 glass slabs, and manipulated in the same manner as the lower tray
Upper individual tray
Two most important factors in making satisfactoy impressions
Properly formed and accurately fitting impression trays
Proper positioning of the tray within the mouth
A neative likeness or copy in reverse of the surface of an object
Impression
A negative registration of the entire denture bearing area, and stabilizing border seal areas present in the edentulous mouth
Complete denture impression
First impression for the purpose of study cast
Impression for tray selection
Is an impression made for the purpose of diagnosis or for the construction of tray
Preliminary impression
Any substance or combination of substances used for making an imperssion or negative registration
Impression material
Surgical removal or trimming of the alveolar process
Alveolectomy
Surgical recontouring of the alveolar process
Alveoplasty
Surgical procedure to restove alveolar ridge height by lowering muscles attaching to the buccal ,labial and lingual aspects of the jaws
Vestibuloplasty
Objective of impression taking
Preservation of alveolar bone
Retention
Esthetics
Support
Stability
It is the resistance of denture to removal in a direction opposite to that of its insertion
Retention
Resists the adhesiveness of foods, force of gravity and the forces associated with the opening of the jaws
Retention
The ability of the denture to withstand horizontal force
Stability
Is the resistance to vertical force of mastication and t occlusal or other forces applied in the direction towards the basal seat
Support
Supporting structures
Primary stress bearing areas
Areas of edentulous ridge that are at right angles to occlusal forces and usually do not resorb easily
Supporting structures:
Secondary stress bearing areas
Areas of edentulous ridge tat are a right angle or parallel to occlusal force
One of the prime factors in CD
Esthetics
What are the limiting structures of the maxila
Labial vestibule
Buccal vestibule
Vibrating line
What are the primary stress bearing areas of the maxilla
Hard palate
Maxillary tuberosity
What are the secondary stress bearing areas in maxillary
Residual ridge
Why does the residual alveolar ridge considered as secondary stress bearing areas
Because it resorbs at a faster rate
Main muscle of the labial vestibule in which forms the outer surface of the labial vestibule
Orbicularis oris
Extends from the buccal frenuum to the hamular notch
Bounded laterally by the cheeks and medially by the residual alveolar ridge
Buccal vestibule
An imaginary line drawn accross the palate that marks the beginning of motion in the soft palate when an individual says “ah”
Vibrating line
It is the posterior convexity of the maxillary body
Maxillary tuberosity
Relief areas of the maxilla
Incisive papilla
Medial palatine raphe
Fovea palatinae
Location of the landmark gives an indication as to the amount of resorption has taken place
Incisive papilla
Limiting structures of the mandible
Labial vestibule
Buccal vestibule
Lingual frenum
Alveolingual sulcus
Retromolar pad
Pterygomandibular raphe
Anterior region of the lingual flange is caled
Sub-lingual crescent area
Supporting structes of the mandible
Buccal shelf area
Residual alveolar ridge
Relief areas of mandible
Mental foramen
Genial tubercle
Mylohyoid rige
Mandibular tori
