Abrasive Technology has patented and manufactures burs out of
composite material, a resin reinforced by zircon-rich glass fiber.
These burs, called STAINBUSTER®
burs, were initially designed to gently remove cement, stains and
coloured coatings from the surface of the enamel: they do not abrade
tooth enamel nor ceramic and only lightly grind cement, dentin and
filling composites. Their range of use has since then been widened
subsequent to clinical trials.
Different STAINBUSTER® shapes
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Mode of Action
The special caracteristic of these burs is the presence of fiber
sections with abrasive power which cover the entire working surface and
which split up into small fragments as and when they act on a hard
surface. At the same time, the resin matrix is used up, exposing new
sections of fibers : these burs are also therefore self-sharpening
whilst continuously maintaining their abrasive power.
IMPORTANT: STAINBUSTER®
burs act as grinding instruments, not as cutting burs: they act by
grinding layer after layer. Therefore, to be efficient, they must be
used at low speed with little pressure ; high speed and strong pressure
would only lead to faster wear and would lessen their abrasive power.
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The
surface of the working end offers cutting sections of zircon-glass
fibers surrounded by resin: they provide the abrasive effect on the
different coatings, cements and exogenous deposits that are to be
removed from the dental surfaces. |
STAINBUSTER® Burs are Painless Burs
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STAINBUSTER®
burs do not affect the soft tissues such as the gingival fibro-mucous
membrane as they slide over them without cutting or grinding. |
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A STAINBUSTER® bur being used on a very sensitive area with no need for anesthesia. |
This
quality, and the fact that the instrument hardly heats up during use,
makes the process virtually pain free, hence its easy acceptance by
patients compared to other instruments and methods. |
By courtesy of Dr. Frank Muller |
Abrasive Power
STAINBUSTER® burs show no abrasiveness towards dental enamel or the ceramics used in dentistry.
They have a slight abrasive effect on the cement dentin and filling and bonding composites used in dentistry.
Their abrasive power has been measured as being two and a half times more abrasive than toothpaste (University of Indiana)
.
Risk Analysis & Bio-Compatibility
The zircon-rich glass fiber is particularly interesting, as unlike
ordinary glass fiber, it does not split up into minuscule fibrils
extremely irritating to the skin and mucous membrane.
Zircon-rich glass fiber is 14 µm in diameter. It breaks or fragments
into particles, not fibrils, which are always longer than 5 µm with a
length/diameter ratio of over 3.
They are therefore not "breathable", in other words, they cannot penetrate the alveoli pulmonis, according to criteria and values defined by the World Health Organisation.
This patented * characteristic allows it to be used for dental burs with permanent abrasive power.
According
to the international standard ISO 7405 concerning the preclinical
evaluation of biocompatibility of medical devices used in dentistry,
the following test have been carried out:
Test type |
Normative reference |
Test result |
Test report No. |
| Cytotoxicity |
Standard ISO 10993-5 |
Negative |
2003-DGM483-1 |
| Acute toxicity in the mouse |
Standard ISO 10993-11, EN 30993-11 |
Negative |
2003-DQZ-623-1 |
| Dermal irritation in the rabbit |
Standard ISO 10993-10 |
Negative |
2003-DQZ-623-2 |
| Sensitisation in the guinea pig |
Standard ISO 10993-10 |
Negative |
2003-DQZ-623-3 |
In conclusion: the use as well as the manufacturing of STAINBUSTER® burs offer no risk to human health.
* US PATENT 6,386,874, patent pending in other countries.