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- 71% of all restorative treatments are performed on previously restored
teeth with recurrent caries as the predominant cause. (Fontana and Gonzales-Cabezas;
Compendium, Vol. 21, No. 1, January 2000; “Secondary Caries and
Restoration Replacement: An
Unresolved Problem”)
- One short term study reported a 50% failure of Class II gold inlays
within seven years. (Donovan,
Simonsen, Guertin, Tucker; Journal of Esthetic and Restorative
Dentistry, Volume 16, Issue 03, May 2004; “Restorations In Service from
1 to 52 Years”.)
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- A study of 114 patients with a total of 1314 cast gold restorations
presented the following survival rates:
97% at 9 years, 90.3% at 20 years, 94.9% at 30 years and 94.1% at
greater than 40 years- cementations of zinc phosphate cements. (Donovan, Simonsen, Guertin, Tucker;
Journal of Esthetic and Restorative Dentistry, May 2004; “Restorations
In Service From 1 to 52 Years”.
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- Clinical Technique
- Dental Materials
- Individual Physiological Resistance to Decay
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- From Dr. Ralph R. Steinman
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- Steinman injected acriflavin hydrochloride (radioactive material) into
the abdominal cavities of rats and was able to recover it in the solid
structure of teeth within minutes (six minutes to the dentin and within
one hour on the surface).
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- The flow of interstitial fluid moves from the pulp chamber through the
dentin, through the enamel and into the mouth.
- The flow can also reverse itself or become stagnant. It can be self-cleansing or
self-contaminating.
What does this say about the idea of creating and maintaining a
sterile field?
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- Let’s learn more about how it occurs.
- Let’s learn more about what actually causes it.
- Let’s learn how to prevent it.
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- Dr. Robert Koch developed the methods to create a solid nutrient media
in order to grow and isolate pure cultures of microorganisms. As productive as the strategy has
been, it tends to perpetuate a misconception that pure cultures are the
norm in nature.
- Planktonic microorganisms are like strains that exist either singularly
or in groups in a free-floating state.
They are a serious threat in this state, but are usually
susceptible to antibiotics and the body’s immune system. Planktonic
bacteria or microorganisms have been the basis for study and the focus
for treatment by the medical and scientific community for over a
century.
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- Through the use of the electron microscope and other such advances we
now can see that microorganisms exist in communal environments, called
biofilms.
- While planktonic forms of microorganisms are free -floating, one of the
outstanding attributes of biofilms is their attachment to surfaces.
- 95% of bacteria found in nature exist in biofilm colonies.
- Biofilm colonies are natural to
our world and produce desirable outcomes in many instances, but they can
wreck havoc in our bodies.
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- Gravity can cause organisms to settle-out and end up resting on a
surface.
- Bacteria often have negative charges and may be attracted to the
positive charges on surfaces.
- Many surfaces attract and concentrate nutrients which bacteria have the
capacity to detect and move toward (chemotaxis).
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- After attachment, copious amounts of extracellular polysaccharides,
called slime are produced.
- The slime helps hold the microorganisms together in microcolonies and
helps maintain attachment.
- A protective layer is created by the slime.
- The slime also helps attract other microorganisms as well as nutrients.
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- The biofilm structure is approximately 73 – 98% noncellular material
with fluid channels running throughout allowing for nutrient flow and
removal of wastes.
- Different shapes form such as mushroom structures and corn cob stacks
which are found in dental plaque.
- They can adapt to environmental situations by changing shape, sending
out appendages to aid attachment and filamentous streamers with heads to
withstand turbulent fluid flows.
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- The polysaccharide slime layer helps to protect the biofilm communities
from invasion by antibiotics and the immune system.
- The outer cells also act as protective barriers, allowing the inner
cells to thrive.
- Bacteria encased in biofilms may be 50 to 500 times more resistant to
chemotherapy than planktonic bacteria of the same strain.
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- Biofilms have adaptability and mobility and can spread throughout the
body.
- Biofilms act as a manufacturing plant for planktonic forms of microbes.
- The planktonic microbes can break-off and become released throughout the
body where they are responsible for serious and chronic systemic
infection.
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- Dental Plaque
- On Decaying Surfaces
- Within Dentin Tubules
- Attached to Restorations
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- Biofilm infected dentin tubules.
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- Hydrophilic
- Porous
- Organic chains subject to chemical change
- Ideal surface areas for biofilm attachment
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- Gordon J. Christensen, D.D.S.,
M.S.D., PhD. states in his article “How To Kill A Tooth” in JADA, Vol.
136, December 2005 that “I have been told by numerous endodontists that
one of the most significant factors related to the increase in need for
endodontic therapy has been the popularity of resin-based composites to
restore posterior teeth”.
He goes on to suggest that the primary cause of this is damage to
the pulp.
He also states that dentinal canals are now sealed by
impregnating them with resin or coagulate which could further irritate
the pulp.
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- “However, clinical observations show that when either type of dentin
bonding is used alone, without mechanical retention, some restorations
fall off during service.”
- “These failures present a confusing phenomenon, since dentin bond
strengths in vitro show values as strong as or stronger than bonds to
enamel.”
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- Except in acute conditions, antibiotics will have no long-term effect.
- Mechanical removal is effective, but as we know recurrent decay is
common.
- Copper ions have been shown to kill planktonic microbial forms, but not
biofilms.
- Copper ions activated with silver or iron have been shown to destroy
biofilms.
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- Was the Baby Thrown Out With the Bath Water?
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- Evaluation of Cytotoxicity of the Mixture of Doc’s Best Antibiofilm
Cement Powder with Copalite Varnish Using the Agar Diffusion Method,
Yiming Li, DDS., PhD., Wu Zhang, MD., Omari Onyango, DDS.,
MPH.,Biocompatibility and Toxicology Research Laboratory, Loma Linda
Univ. School of Dentistry, Sept. 2, 2005.
- Testing for decolorization, cell lysis, cell response and cytotoxicity
measured at 24 and 48 hours.
- Conclusion: The mixture of Doc’s Best Antibiofilm Cement Powder with
Copalite varnish is not cytotoxic as evaluated using the agar diffusion
method.
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48
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- Inorganic material, not subject to chemical changes
- Prolonged anticariogenic activity
- Noncytotoxic, nonmutagenic, biocompatible
- Provides necessary trace elements
- Infintesimal solubility
- Dependable cementation applications
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- Study performed at Center for Biofilm Engineering; Montana State
University; Bozeman, Montana, January 28, 2005 by Paul Sturman, PhD.,
Director- William Costerton, PhD.
- Organisms tested in stagnant media to best simulate oral conditions.
- Streptococcus mutans and
Lactobacillus paracasei were innoculants used as tests for biofilm
formation.
- Conclusion: No biofilm
colonization was formed using Doc’s Best Red Copper Cement or White
Copper Cement.
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- Study conducted at Loma Linda University School of Dentistry,
Biocompatibility and Toxicology Research Laboratory, Submitted December
22, 2005.
- Researchers: Yiming Li, D.D.S.,
Phd., Wu Zhang, M.D., Minling Zheng, D.D.S., M.S.
- Conclusion: The Mixture of Doc’s
Best White Copper Activated Copper Cement with Copalite Varnish is not
mutagenic in the Ames Salmonella mutagenicity test with or without the
S9 microsomal activation.
- Tables of Results on following pages.
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