Direct Restorative Dentistry 1 Final

Burs for composite resin polishing

• carbide burs 20 or 30 fluted

• abrasive discs and strips

• impregnated rubber wheels

• points and cusps

• felt discs/points with polishing paste

• carbide burs 12 or 16 fluted

• fine diamond burs

• abrasive discs and strips

abrasive strips (plastic backed)

used for resin-composite, compomers, hybrid ionomers and resin cemement

abrasive strips (metal-backed strips)

for very tight proximal contacts are involved

amalgam finishing and polishing

• finishing burs in slow-speed hand

• abrasive-impregnated rubber cups and points

• abrasive metal strips for interproximal area

• pumice in water applied with rotary brush

• tin oxide in water or alcohol applied with rotary brush or felt wheel

polishing high-copper amalgam

doesn’t improve performance

burs for finishing/polishing amalgam

finishing - steel and diamond

polishing - abrasive-impregnated rubber and polishing pastes

burs for finishing and polishing composite

finishing - carbide fluted burs and diamond burs

polishing - abrasive discs, polishing pastes and abrasive rubber

important things to consider with abrasives

• use descending abrasiveness order

• rinse between different abrasives

• use cooling agent

• use highest water volume and suction with amalgam

class 2 pulpal floor

1.5-2.5 mm deep

class 2 isthmus

¼ to ¼ of intercuspal distance

axial wall in class two prep amalgam

parallel to outer surface of the tooth, 1.5 to 2.5mm for molars or up to 2mm for premolars

shape of box buccal and lingual axial walls

converging

what bur to use to remove carries

low speed with carbide bur (soft area)

class 2 amalgam pulpal wall depth

1 mm to 2.5 mm