2. Cementation and Bonding
Five preparatory procedures need to be performed
on any type of cemented restoration after it has
been fabricated in the laboratory:
(1) preliminary finishing
(2) try-in and adjustment
(3) Precementation polishing
(4) cementation
(5) Post cementation finishing.
3. Table 21-1 Knoop hardness
number (KHN) of dental
substances and materials
4. Abrasives and Polishing
Materials
involves the abrasion of a surface by an abrasive agent that is harder than
the surface to be abraded, or polished. When a dental hygienist is truly
polishing, the paste or slurry containing an abrasive agent will
microscopically alter the tooth or restorative surface.
A cleaning agent is not abrasive and will not alter the surface
characterization of enamel or esthetic restorative materials. The surface
being cleaned is not altered or abraded as it would be in polishing.
5. • Silicon carbide
• Aluminum oxide
• Ripoli
• Rouge. Composed of iron oxide (Fe2 O3 )
6. • Sand(Sand is a form of quartz and may be seen in various
colors. Sand particles are rounded or angular in shape. They
are typically bonded to paper disks for grinding metals and
plastics.)
• Cuttle. (As we know it today, cuttle is a fine grade of quartz.
These particles are also bonded to paper disks and are beige in
color. They are available in coarse, medium, and fine grits. In
the past, it was manufactured from the inside shell of a
Mediterranean marine mollusk. A “cuttle bone” mounted in a
parakeet’s cage is made of the same material)
7. Diamond
• Diamond burs are actually very small diamond chips that are bonded to a shaft. Diamonds are very
hard materials and make very good abrasives. Depending on the size of the chips, diamond burs
can be used in many dental procedures.
8. Aluminum oxide
• is a common abrasive used in dentistry, and it has essentially replaced emery for several uses. This
abrasive,, is widely used in the form of disks and strips. It is also impregnated into rubber wheels
and points. It is the abrasive used in the popular “white stones” to adjust enamel or to finish metal
alloys and ceramic materials
9. Emery. This hard
(Emery is sometimes also called “corundum.” We are familiar
with this abrasive because of “emery boards,” which are used to
file our fingernails. Emery is a natural form of aluminum oxide,
and it looks like grayish-black sand. It is commonly found on
arbor bands that attach to a dental lathe for grinding custom trays
and acrylic appliances.)
10.
11. Tin oxide
• An extremely fine abrasive, tin oxide is supplied as a white powder and is
used as a final polishing agent for teeth and metallic restorations. It is used
as a paste or slurry in the same manner as Silex. Both Silex and tin oxide
are illustrated in pic
13. Armamentarium
• High-speed handpiece
• Straight handpiece
• Separating disk on mandrel
• Cratex disk on mandrel
• 5 /8-inch blue wheel on mandrel
• Blue mounted knife-edge disk
• No. 0 bud finishing bur (Pfingst)
• No. 330 friction-grip bur
• Articulating paper
• Green stone (Dura-Green, Shofu)
31. Evaluation of a restoration should be carried
out in the following sequence:
1.Proximal contacts
2. Margins (completeness of seating)
3. Occlusion
4. Contours
5. Esthetics
