2. TIK
SETELAH MENGIKUTI KULIAH INI, MAHASISWA
DIHARAPKAN MAMPU MENJELASKAN TENTANG :
1. Definisi material abrasive
2. Jenis
3. Komposisi
3. Types of Abrasives
• The three types of abrasives used in dentistry can be
classified as
1. finishing,
2. polishing, and
3. cleansing abrasives.
4. Types of Abrasives
1. Finishing abrasives are generally hard, coarse abrasives used
primarily for development of desired contours of a restoration or
tooth preparation and for removal of gross irregularities on the
surface.
2. Polishing abrasives have finer particle sizes and are generally
less hard than abrasives that are used for finishing. The polishing
abrasives are used to smooth surfaces roughened typically by
finishing abrasives or wear particles encountered in the mouth.
3. Cleansing abrasives are generally soft materials with small
particle sizes and are intended to remove softer materials that
adhere to enamel or restorative material substrates.
5. • Dental abrasives are applied by means of a number of tools, shown in
Figure 6-1.
• The abrasive particles may be glued onto plastic or paper disks that
can be attached
• to a dental handpiece or attached to strips for finishing of interproximal
areas. Paper
• disks are preferable for finishing contoured surfaces because they are
more flexible
• than plastic disks. The waterproof variety of paper disks is more
durable. In the case
• of diamond rotary instruments, diamond chips are attached to steel
wheels, disks,
6.
7. • Abrasives also may be mixed with water, glycerin, or
some other medium to produce slurries or pastes. The
use of glycerin as a medium prevents the change in
consistency that occurs when water, which evaporates, is
used to make a slurry.
• The slurry or paste then is rubbed over the surface of the
material being abraded with a cloth or felt wheel, brush, or
rubber cup.
• Abrasive slurries and pastes are used most commonly in
dentistry for polishing and cleaning.
8. • Aluminum oxide (Al2O3) is an abrasive manufactured from an
impure aluminum oxide (bauxite) and produced in various particle
sizes. The particles are applied most commonly to paper or plastic
disks in coarse, medium, and fine grits. The disks are reddish
brown. Aluminum oxide powders (typically 27- and 50-μm particle
sizes) are used in air-abrasion units.
• Cuttle is an abrasive manufactured from the bones of fish, although
this form is no longer used as a dental abrasive. Presently, cuttle is
a trade name that refers to a fine grade of quartz (SiO2).
• The particles are applied to a paper disk in coarse, medium, and
fine grits. The medium cuttle grit is similar in abrasive action to fine
sand grit. Cuttle disks are beige.
• Diamond is the hardest known substance. Diamond chips normally
are impregnated in a binder to form diamond “stones” and disks.
Disks with
