September 9th, 2009 by admin
There is great variation in tooth mortality statistics in different
parts of the world, evidently reflecting preventive health behaviour
and the availability and effectiveness of dental services. The
dentist’s and patient’s attitude, together with technical difficulties
associated with provision of treatment, may also be significant
factors determining the timing of extractions. While caries and
periodontal disease are the commonest reasons for adult tooth Read the rest of this entry »
September 8th, 2009 by admin
Preventing apical periodontitis after
root canal treatment
The root canal treated tooth has none of the complex physical
and responsive barriers to protect the apical periodontium from
the oral flora. It has also been shown that coronally unsealed root Read the rest of this entry »
September 8th, 2009 by admin
Simple pulp capping of carious and long-standing (>24 hours)
traumatic exposures cannot be recommended. In immature teeth,
where the pulp has not yet completed its task of root formation,
and where root canal treatment would be difficult, advantage can
be taken of the pulp’s great healing ability. In these situations,
pulp amputation is advocated, in which an attempt is made to
excise all of the affected tissue and leave the sterile, healthy radicular
pulp to complete tooth development.
Working under aseptic conditions, the infected coronal
2–3 mm of pulp tissue are removed under sterile saline irrigation Read the rest of this entry »
August 25th, 2009 by admin
The success of a composite restoration is also judged by the
color of the restoration. Its color should be as close as possible
to that of the natural tooth. This aspect may not be quite
as important in the posterior region as it is in the case of
front teeth. In fact, a slight deviation in color can be useful
i n the posterior teeth, since the margins are recognized
more easily, which makes it easier to remove any overhangs.
The color should be selected when the treatment starts. The
principles of color selection are the same as in the case of
crowns and bridges. However, the dentist should be aware
of some particular aspects when selecting colors of composites:
-Dehydrated teeth become white-opaque and it takes Read the rest of this entry »
August 25th, 2009 by admin
Filler particles that are used in composites are formed by
grinding large quartz or glass pieces down into finer particles.
It is also possible to precipitate particles in a liquid or
burn a mixture of gases. If the particles are formed through
grinding, the process is from bigger to finer particles, while
with precipitation it is from molecular size to particle size. Read the rest of this entry »
August 25th, 2009 by admin
In order to form a bond between resin and filler, the
monomer must wet the filler particles and produce a chemical
and/or mechanical attachment to the filler particles.
These so-called coupling agents, or bonding agents, that are
used to form the chemical bond usually belong to a group of
chemicals called silanes.
Since the main component of most filler particles is SiO 2
(silica), the bond formed between the silane molecule and Read the rest of this entry »
August 25th, 2009 by admin
Chemical components such as ultraviolet light absorbers,
different pigments, and opaquers are added to the matrix in
small quantities to improve the aesthetic property of composites.
Compounds such as 2-hydroxy-methoxybenzophenone, 2-
(2′-hydroxy-5′-methylphenyl) benzotriazole and phenyl salicylate
are ultraviolet light absorbers which absorb ultraviolet
light that could otherwise cause changes in the color of Read the rest of this entry »
August 25th, 2009 by admin
The matrix of a composite consists of several chemical
components, of which resin is the most important. Other
chemicals contribute to the initiation of the polymerization
process, but they also prevent the resin from spontaneously
polymerizing during storage. In addition, the matrix also
contains components that improve the aesthetic qualities of Read the rest of this entry »
August 24th, 2009 by admin
1. Determine tooth color and take photographs.
2. Isolate the treatment area with rubber dam.
3. Seal the root canal filling with a resin-modified glass
ionomer cement. Perform radiographic control.
4. Etch the pulp chamber for no longer than 30 seconds
with a 37% phosphoric acid.
5. Mix Superoxol and sodium perborate. Place it in the pulp
chamber.
6. Apply heat for two to five minutes. Then remove the Read the rest of this entry »
August 24th, 2009 by admin
When bleaching nonvital teeth, the bleaching agent is
placed into the pulp chamber of the tooth. This method is effective
when one wants to brighten nonvital teeth that have
changed color after root canal treatments.
History and State of the Art of the Technique
One of the first successful attempts to perform internal
bleaching was described by Brown (1965). He mixed sodium Read the rest of this entry »
