8/15 - #14 FCC, chamfer reading

Question 1

per the lecture, #14 prep is basically what

Answer 1

19 prep upside down

Question 2

14 FCC Prep:

• TOC
• Wall height
• functional cusp where
• margin description
• margin terminates where
• occlusal clearance

Answer 2

• TOC: 10-15 degrees
• Wall height: at least 3 mm
• functional cusp where: lingual
• margin description: 0.5 mm chamfer all the way around
• margin terminates where: 0.5 mm occlusal to CEJ
• occlusal clearance: between 1-1.5 mm

Question 3

“chamfer” word origins

Answer 3

middle french and latin

Question 4

“chamfrain” origin and meaning

Answer 4

Middle French = edge

Question 5

“canthus” origin and meaning

Answer 5

Latin = cant

Question 6

knife edge finish line is only applied to what type of margins

Answer 6

all metal cast restorations that have extremely obtuse cavosurface angle

Question 7

what is the oldest margin design used with complete metal crowns

Answer 7

knife edge

Question 8

what margin has a slightly indented axial reduction

Answer 8

chamfer

Question 9

advantages of the chamfer that replaced the knife edge

Answer 9

1. ease in identifying cavosurface margin
2. ease in capturing impression
3. thickening the crown margin to improve casting accuracy and prevent metal failure

Question 10

does the chamger preserve the obtuse cavosurface angle

Answer 10

yes

Question 11

what is a finish line design for tooth preparation in which gingival aspect meets the external axial surface at an obtuse angle

Answer 11

chamfer

Question 12

is the chamfer generally thought of as producing a curve from axial wall to the cavosurface

Answer 12

YES

Question 13

the preferred gingival finish line for veneer metal restorations is what

Answer 13

chamger

Question 14

if the chamfer is cut too deply and the cavosurface angle is 90 degrees, what wille exist

Answer 14

butt joint

Question 15

what chamfer has a deeper axial reduction made with a larger diameter, round ended diamon producing a large radius curve that connects the cavosurface margin with axial wall

Answer 15

deep chamger

Question 16

what chamfer has a right angle cavosurface angle

Answer 16

deep chamfer

Question 17

what is also called a cove

Answer 17

deep chamfer

Question 18

a ___ (also called ___) is used to provide a 90 degree cavosurface angle with a large radius-rounded internal angle

Answer 18

deep chamfer also called heavy chamfer

Question 19

what preparation:

• squared inner angle where axial wall meets the shoulder
• external 90 degree cavosurface angle

Answer 19

shoulder preparation

Question 20

what shoulder preparation was first developed for use with what crowns

Answer 20

porcelain jacket crowns

Question 21

what has a finish line design for a tooth preparation in which the gingival floor meets the external axial surfaces at approximately a right angle

Answer 21

shoulder finish line

Question 22

what is a shoulder preparation with a radius rounded inner angle termed as

Answer 22

radial shoulder

Question 23

how is conventional shoulder different from radial shoulder

Answer 23

conventional - 90 degrees
radial - rounded inner angle

Question 24

what is one of the oldest finish lines along with knife edge

Answer 24

beveled shoulder preparation

Question 25

what is intended to provide an OBTUSE finish line for proximal boxes of metal inlays, onlays and partial veneer crowns

Answer 25

beveled shoulder prep

Question 26

can a beveled shoulder preparation be called a chamfer

Answer 26

YES

Question 27

what preparationcan be used in situations where a shoulder is already present either because of destruction by caries or the presence of previous restorations

Answer 27

beveled shoulder preparation