2.1 complex restorations

A complex restoration refers to a restoration that replaces one or more ______

cusps

What is the most important factor when deciding between amalgam and composite?

isolation

If the weakened cusp exceeds more than _____ the distance from the primary groove to the tip of the cusp, cusp coverage is indicated.

2/3

Direct vs Semidirect vs Indirect

Direct: 1 appointment technique sensitive

Semidirect: 1 appointment can be done on benchtop

Indirect: 2 appointment best but a lot more expensive

Axial Contour should be ______

convex instead of flat

Resistance form qualities

90 degree CSM
Adequate depth (at least 1.5 mm)
Rounded internal angles

retention form qualities

Convergent walls
Dovetails
Retention features

Auxiliary retention features

Slots
Coves (Vertical grooves)
Horizontal grooves
Boxes
Amalgam pins
metal pins
bonding

Which cusp fractures most frequently in mandibular molars and premolars

Lingual cusps (twice as often)

Which cusp fractures most frequently in Maxillary molars and premolars

buccal
(twice as often)

The functional cusp in maxillary molars an premolars is the ______.
Mandibular?

lingual
facial

The _____ cusp is the most likely to fracture.

non-functional

If replacing a functional cusp the reduction should be _____ mm.

2- 2.5

If replacing a non-functional cusp the reduction should be _____ mm.

1.5 -2

When reducing the cusp, hold bur _____ to the cuspal incline.

parallel

When reducing the cusp, Extend reduction just beyond _____ groove, Sloping toward the ______.

F/L
central groove

Retention grooves/coves are place in _______ walls, in the same relationship to ____, 0.2 mm inside the ____, Place with a ¼ round bur or 169L bur. (0.3-0.5 mm)•

vertical
DEJ
DEJ

horizontal slots are placed in ______ walls if there is a lack of sufficient wall _____ (1mm), 0.5 mm inside _____.• . Prepared with #1 round bur (full depth of bur head)

horizontal
height
dentin

Boxes are placed _______, _____ or _____ grooves.• Great for resistance and retention form.

interproximal, buccal, or lingual

Amalgam pins are a _____ chamber cut ______ into dentin. #330 or #245 bur. Desirable depth ______ mm. ________ on the junction of pulpal floor. (#4 bur)

circular
vertically
1-1.5
Contra-bevel

Metal pins can be used when few or no ______ walls remain. Restoration shear strength is better than with retention features. Needs ___ mm (___ mm amalgam thickness and ___ mm of pin)

vertical
4
2
2

As rule, ____ pin per missing line angle should be used.

one

3 types of pins

cemented, friction-locked or self-treading (most common)

Diameter of pinhole is ______ than the Diameter of pin

smaller

T or F: metal pins can be placed in vertical or horizontal walls

true

The pinhole should be positioned no closer than ______ mm to the DEJ or no closer than _____ mm to the external surface of the tooth.

0.5 to 1
1 to 1.5 mm

The operator should probe the _______ carefully to determine if any abnormal contours exist that would predispose the tooth to an external perforation.

gingival crevice

The pinhole should be ______ to the adjacent external surface of the tooth

parallel

pins may

create craze lines
fracture dentin
produce internal stress

bonding amalgam is ____ or ____ cure. Use the same retention as conventional

dual
self