Materials Science 5

Question 1

Overtrituration

Answer 1

soupy, difficult to remove from the capsule, excess matrix is formed, sets prematurely

Question 2

Proper Mix

Answer 2

shiny and soft, warm as removed from capsule

Question 3

Undertrituration

Answer 3

grainy, crumble and dull, reduced strength, hard to handle

Question 4

Oregon 2

Answer 4

with ends of (1.0 mm and 1.5 mm diameter )

Question 5

Oregon 4

Answer 5

2-3mm in diameter

Question 6

Small condenser for

Answer 6

lathe cut

Question 7

Vertical:

Answer 7

round face of the condenser

 Either perpendicular to the long axis or at 45 degree

Question 8

Lateral:

Answer 8

side of the condenser

 Either parallel to the long axis or at 45°

Question 9

Condensation - Lateral/horizontal Strokes

Answer 9

against walls of the preparation where the side of the condenser will do the work.

Locations:
This type of stroke is solely used in Class I with extension cases (buccal and lingual boxes)
Also proximal box
In some class I cases where there is a narrow outline in the groove areas

Question 10

Carving instruments

Answer 10

 Anatomical burnisher (21B carver)
 Discoid- cleiod the cleiod end is elliptical in shape with a pointed end
 Hollenback blade type instrument with 2 working edges and a pointed tip on each side
 Interproximal carver IPC (class II)

Question 11

initial carving

Answer 11

Use an acorn burnisher
Anatomical burnisher/21B carver / acorn burnisher
Pointed sharp tip
Between condensation and final carving

Question 12

Anatomical burnisher

Answer 12

Forms crude anatomy
 Reestablish central groove area and pit
 Does not create deep anatomy if used at the right angle to the surface  Placed parallel to the long axis and not leaning against the cusp slopes

Question 13

Discoid end

Answer 13

Discoid end is a disc shape
 Right at the cavosurface supported by the
tooth
 Lay 1/2 on tooth structure and half on amalgam to remove excess

Question 14

Cleoid end

Answer 14

Point is at the central groove area and side is against unprepared tooth to clean up the margin
 Careful not to go too deep

 We probably not as deep as they were originally

Question 15

Two strokes - pull stroke 1

Answer 15

With gentle light pressure move the edge of the carver parallel to the margin
 Partially resting on tooth structure (as a guide) and partially resting on amalgam
 Tip of the carver should not pass the central groove area
-
Pull stroke
 Do Not fulcrum carver on the cavosurface margin…submarginal or
undercontouring.

Question 16

Push stroke 2

Answer 16

defining the developmental grooves

From tooth structure to amalgam

Question 17

Flash

Answer 17

Undercarved - extra at margins.

Question 18

Open margin

Answer 18

break between tooth and the amalgam restoration. It not continous
trap food particles and allows passage for microorganisms

Tip of the explorer catches when moved in both directions across the margin

Question 19

Submarginal

Answer 19

the seal between amalgam and the enamel is not broken. If ≤ 0.2mm of tooth structure is left then enameloplasty
>0.2 mm then replace your restoration

Explorer catches in one direction.

Question 20

Flash (excess)

Answer 20

excess above and tapering beyond the external margin