Class II Restorations

tofflemire matrix system uses and components

use = class II amalgam restorations

components = retainer + band

can tofflemire matrix system be used for composite restorations?

no

4 types of matrix band

1. universal

2. MOD (has two humps on it, good for deep preps)

3. pedo

4. dead soft bands (bad)

tofflemire matrix bands are used when restoring ___ which is typically class ___ restorations

proximal surfaces

2

benefits of tofflemire matrix band

- proper contact + contour

- confine/ reduce excess material

- protect adjacent teeth

maxtrix bands should extend below ___ and above ___

gingival margins

marginal ridge height

matrix band and burnishing

you can burnish contact area w/ burnisher after placement to create ideal prox contact and contour

placement of retainer: slots? arch?

slots face gingivally and band arch goes towards occlusal

why is placement of retainer important?

allows band to be properly removed

matrix band orientation for mouth quadrants

max right = mand left

max left = mand right

___ end of band should be toward gingival neck of tooth

narrow

where should the retainer be? what would indicate an exception to this?

buccal side

exception = missing buccal wall/ support

tofflemire placement should be extended ___mm gingival to ___

1mm+

gingival seat

wedge purposes (5)

- tight seal

- no gingival overhangs

- separates teeth

- compensates for band thickness

- creates tight contact

wedge types

1. standard wood

2. anatomic wood

3. anatomic plastic

4. fender plastic

5. other

standard and anatomic wooden wedges are made of ___ and when they get wet ___

sycamore wood

expand and conform to interprox area

plastic fender wedges are designed to ___ but are ___

protect adjacent teeth

expensive + sharp

proper wedge positioning must (3)

- retract gingival tissue

- occupy gingival embrasure

- seals gingival seat

what happens if you place a wedge in the wrong position or use the wrong size?

hinder development of physiologic contact

matrix bands are placed so Tofflemire retainer = ___ side of the teeth

buccal

wedges are placed on what side of teeth?

buccal or lingual

wedge from lingual when retainer is on buccal side

instrument to place wedges

cotton forceps or hemostat

goals of amalgam condensations (3)

- compact alloy

- adapt to prep walls + line angles

- decreases excess mercury

condensation should begin ___ and strokes should always be ___

deepest part of prep

orderly and overlaping

goal of carving amalgam

reproduce anatomy for proper form and function*

steps for amalgam carving

1. mental pic of outline form before restoration

2. pre-carve brunish

3. start carving at margins, remove flash

4. finish carving, develop anatomy

5. smooth surface (post-carve burnish)

6. verify + adjust occlusion

contour marginal ridge with ___ when the ___ is present

explorer

matrix band

when amalgam starts to harden but is not fully solidified

1. unscrew and remove tofflemire (keep band in place)

2. remove wedge

3. remove matrix band

matrix removal steps

1. detach amalgam from matrix band w/ explorer

2. loosen nuts on the retainer

3. remove the Tofflemire retainer (hold band in place)

4. remove wedge + band

matrix band should be removed ___º with ___ instruments

vertically at 45º

cotton pliers/ hemostat

what do you do if marginal ridge fractures below cavosurface when matrix band is being removed?

completely remove and redo restoration

once matrix band is out, check for

- overhangs (first)

- interproximal contour

when can you remove rubber dam with amalgam restorations?

AFTER initial carving is complete*

after rubber dam is removed

check and adjust occlusion

after amalgam trituration, the mix should be

smooth and homogenous

before beginning prep

pre-check occlusion