Exam 2: Retention,Resistance,Convenience

Question 1

_______ form: Design features which lock or retain the restoration and prevent the restoration from coming out.

Answer 1

Retention

Question 2

Class II amalgam: The internal walls (F/L) are slightly ______ or straight. Which 2 burs create this?

Answer 2

convergent….245 or 330

Question 3

A ______ isthmus allows for greater convergence.

Answer 3

smaller

Question 4

The ______ the isthmus the less the prep will converge, due to the enamel rods.

Answer 4

larger

Question 5

RETENTION GROOVES: are in ______, follow the ____, do NOT cut into the _____ wall!!! Placed into the _____ and ______ walls, use a _______ bur or the tip of a thin tapered diamond bur, should extend from the ______ floor to the _____ floor.

Answer 5

dentin…DEJ…axial (my issue!)..facial & lingual (again, NOT AXIAL!!)…1⁄4 round…gingival…pulpal

Question 6

What was the % of bonding amalgam that worked over 5 years? (even though it DOES help with retention!)

Answer 6

53%..not too good dawg

Question 7

What does adding a ‘+’ in the prep surface notation mean?

Answer 7

a cusp is taken out with the prep (#19MOD+)

Question 8

For really freaking big preps, you can increase retention with _____ and ______ to make an undercut. You can use the depth and width of a ____ bur, but watch out for the ____!!

Answer 8

slots and troughs….34 diamond…pulp!

Question 9

For a CROWN PREP! We need at least __mm to retain a crown.

Answer 9

4mm

Question 10

_______ form: Design features which help the restoration and tooth resist FRACTURING as a result of OCCLUSAL forces.

Answer 10

Resistance form

Question 11

Resistance form: amalgam prep-need ATLEAST ___ mm depth in the central groove for adequate strength.

Answer 11

1.5mm

Question 12

EXAM Q: The AXIAL thickness for your class II amalgam REQUIRES __mm for PM’s and ___mm for molars!!!

Answer 12

1mm pm’s….1.2mm molars

Question 13

What is the #1 source for CUSP fracture?

Answer 13

Isthmus WIDTH

Question 14

What is the minimal isthmus width on a class I amalgam prep??

Answer 14

1mm

Question 15

Effects of strain and fracture propagation are ________!!!!!

Answer 15

CUMULATIVE

Question 16

_______ expansion of the tooth and amalgam creates lots of internal strain on tooth structure.

Answer 16

Thermal expansion

Question 17

We want ______ internal line angles!

Answer 17

rounded

Question 18

Floors are ______ to the occlusal forces! Except the ______.

Answer 18

perpendicular…mand first pm

Question 19

Over-converging our walls will create ______ enamel!

Answer 19

unsupported!!

Question 20

Having a 90 degree cavo-surface margin helps keep _____ to a minimum.

Answer 20

CREEP

Question 21

Having an ‘__’ curve on our Class II amalgam prep helps us keep the triangular ridge!

Answer 21

‘S’ curve

Question 22

The angle of departure needs to be ____ degrees (we do this with the hatchet.

Answer 22

90 degrees

Question 23

The axio-pulpal line angle is ______ in our Class II preps. When do we need to make a bigger one of these?

Answer 23

beveled…Deep decay requires a bigger bevel

Question 24

_______: Design features which make the procedure accessible and easier to be performed.

Answer 24

Convience

Question 25

Is it ok to keep the prepped tooth in contact on our class II?

Answer 25

yes, like our aesthetic example

Question 26

What is a useful technique in accessing proximal root caries?

Answer 26

proximal slot prep! (out side the box)