OpTech

Question 1

purpose of wooden wedges

Answer 1

adapting matrix band

formation of contact point

Question 2

amalgam carrier

Answer 2

carry amalgam from dappen pot to cavity

Question 3

dental probe

Answer 3

caries detection
point focus
surface testing
retraction

Question 4

carving instrument

Answer 4

carving amalgam
shaping composite
(kind of leaf shaped + flat)

Question 5

burnisher

Answer 5

finishing amalgam restorations
manipulating composite
(rectangle shaped and rounded at nib)

Question 6

excavator

Answer 6

caries evaluation and removal
material removal and manipulation
shaping and contouring restoratives
(diamond shaped and very thin side on view)

Question 7

flat plastic

Answer 7

manipulation of filling materials

long and narrow at nib

Question 8

2 types of tweezers

Answer 8

collage tweezers - criss cross handle

surgical tweezers - bar code handle

Question 9

compules

Answer 9

contain highly filled bis-GMA resin and are placed in composite gun

Question 10

condenser

Answer 10

condensing amalgam

manipulating composite

Question 11

spatula

Answer 11

mixing materials - not resin / filler based cements and restoratives

Question 12

meaning of band on bur

Answer 12

indicates diamond grit size

Question 13

gold coloured coating on some instruments

Answer 13

zicronium nitride - used for wear protection especially on rotating instruments

Question 14

matrix retainers

Answer 14

replacing cavity walls

moisture control

Question 15

cavity margins

Answer 15

junction between walls of cavity preparation and external surface of tooth

Question 16

cavosurface margin angle

Answer 16

angle formed at any point on the junction of a preparation with the unprepared surface of the tooth - should be 90 degrees in amalgam

Question 17

line angles

Answer 17

line formed by junction of 2 surfaces of a prepared/unprepared surface

Question 18

point angles

Answer 18

the angle formed by the junction of 3 surfaces

Question 19

occlusal / pulpal floor

Answer 19

surface which is parallel to occlusal plane and overlies the pulp

Question 20

gingival floor

Answer 20

a cavity surface in an approximal cavity which is parallel to the occlusal plane and bounded externally by the gingival margin

Question 21

pulpal axial wall

Answer 21

cavity surface that is parallel to the long axis of the tooth

Question 22

buccal / lingual axial wall

Answer 22

cavity surface which is bounded by cavosurface angle and cavity floor

Question 23

isthmus

Answer 23

least wide part of the occlusal key cut in a proximal occlusal restoration as a retentive form

Question 24

principles of cavity design

Answer 24

1. identify and remove carious enamel
2. remove enamel to identify the maximal extent of lesion at ADJ and smooth enamel margins
3. progressively remove peripheral caries in dentine - from ADJ first and then circumferentially deeper
4. only then remove caries from over the pulp with excavator or slow speed bur
5. outline form modification - enamel finishing / occlusion / requirements of restorative material
6. internal design modification - internal line and point angles / requirements of restorative material

Question 25

white band

Answer 25

super fine

Question 26

yellow band

Answer 26

extra fine

Question 27

red band

Answer 27

fine

Question 28

blue band

Answer 28

standard

Question 29

green band

Answer 29

coarse

Question 30

black band

Answer 30

super coarse