5, preliminary impression Flashcards
a negative likeness or copy in reverse of the surface of an object
impressions
is a negative registration of the entire denture bearing, stabilizing and border seal area present in the edentulous mouth
complete denture impression
first impression for the purpose of the STUDY CAST
impression for tray selection
is an impression made for the purpose of DIAGNOSIS OR FOR THE CONSTRUCTION OF TRAY (DIAGNOSTIC CAST)
preliminary impression
any substance or combination of substances used for making an impression or negative reproduction
impression material
what are the basic requirements of impression making
- knowledge of oral anatomy
- knowledge of basic reliable technique
- knowledge and understanding of materials
- skill
- patient management
objectives of impression taking
- Preservation of alveolar bone
- Retention
- Esthetics
- stability
- support
it is the resistance of denture removal in a direction opposite to that of its insertion
retention
in impression taking, it is best to cover as much of the ___ as possible
supporting areas
__ resists the adhesiveness of food, force of gravity, and the forces associated with the opening of the jaws
retention
one prime factor in complete denture
to achieve the objective, a highly accurate impression is necessary
esthetics
it is the ability of the denture to withstand horizontal forces
stability
what are the factors affecting stability
A. height of alveolar ridge
B. quality of soft tissues
C. occlusal plane
D. teeth arrangement
E. contour of polished surface
it is the resistance to vertical forces of mastication and to occlusal or other forces applied in the direction towards the basal seat
support
steps in making an impression
preliminary examination of the patient
seating the patient
selection of tray
selection of the material
