border molding and secondary/final impressions

Question 1

an impression made for purpose of diagnosis or for construction of a tray

Answer 1

preliminary impression

Question 2

negative registration of entire denture bearing, stabilizing and border seal areas present in the edentulous mouth

Answer 2

complete denture impression / secondary impression??

Question 3

impression pressure philosophies

Answer 3

minimal pressure
functional pressure
selective pressure

Question 4

attempt is made to exert as little pressure as possible during impression procedures

Answer 4

minimal pressure impression

Question 5

objective is to capture tissues in their most undisturbed and undisplaced form

Answer 5

minimal pressure

Question 6

suggested that if tissues are recorded in an undisturbed state using an accurate, free-flowing impression material, retention and stability of the dentures would be increased

Answer 6

rationale (minimal pressure)

Question 7

impressional material for minimal pressureL

Answer 7

low viscosity
high flow

Question 8

impression made with the soft tissue under a significant load
-impression material is more viscous material

Answer 8

functional pressire impression

Question 9

impression tray is seated. patient closes mouth with force while material sets

Answer 9

functional pressure impression

Question 10

theory is that denture base-tissue contact during function would be more intimate if tissue is recorded under compression

Answer 10

functional pressure impression

Question 11

-impression with pressure on certain areas.
-minimal pressure on other areas
-dentist decides where and how much pressure

Answer 11

selective pressure impression

Question 12

dentist decides where and how much pressure
-knowledge of anatomy, physiology
-mental picture-ideal impression

Answer 12

selective pressure impression

Question 13

how do we select areas of pressure and non-pressure within the same impression?

Answer 13

1. wax spacer relief
2. drill vent holes in tray
3. grind the tray for relief space
4. combination of the above

Question 14

why use a custom tray?

Answer 14

borders can be modified to control the movable soft tissues around the impression and avoid distorting them

spaces can be provided inside the tray so that the shape of the tissues supporting the denture may be recorded with minimal or selective displacement in the primary support areas

Question 15

4 things of secondary impressions

Answer 15

1. mucosa should be healthy
2. impression material of low viscosity
3. use minimum pressure to seat tray
4. seat and HOLD IMPRESSION unit set

Question 16

purpose is to define denture border in length, width, shape and contour

Answer 16

border molding

Question 17

when completed should resemble anticipated denture border
-have mental picture of how denture border is expected to look: smooth, uniform, rounded-not sharp

Answer 17

border molding

Question 18

with maxillary border molding, the tray must extend:

Answer 18

into each hamular notch and to just beyond/posterior to the vibrating line (“ah” on soft palate)