Orthotown November 2017 - 34
In orthodontics, the clinician
must be conscientious of the
residual film some pumices
may leave behind. Several
flavored pumices contain oil
and can leave behind a layer
that will complicate the
subsequent bonding steps.
processes. However, in orthodontics, the clinician must
be conscientious of the residual fi lm some pumices may
leave behind. Several flavored pumices contain oil and can
leave behind a layer that will complicate the subsequent
bonding steps, ultimately sacrificing strength to the tooth.
34
NOVEMBER 2017 // orthotown.com
Fig. 1
Air abrasion
Microetch, sandblast, abrade, etc.-if there's one
instrument that has revolutionized the orthodontist's ability
to bond to artificial surfaces, it's the chairside sandblaster
(Fig. 1). The same technology that lab personnel will
use to remove adhesive from broken bracket mesh in a
self-contained cabinet is now quickly gaining popularity
at the chair. To achieve optimal bond strength and reduce
the potential of substrate fracture, there is one primary
difference between the enclosed cabinet sandblaster and a
chairside unit-particle size. Aluminum oxide in the 80- to
90-micron size is appropriate for lab bracket cleaning,
while 50 microns is ideal for intraoral surface preparation.
Two types of chairside microetchers are available
today-larger units that require a dedicated air line to
operate, and handpiece adapters that simply replace a
four-hole low- or high-speed handpiece and run off the air
already present to operate the handpiece. There are pros and
cons to both systems, but the "spark plug"-looking adapters
are quickly taking a stronghold on the market because of
how precise the flow of abrasives can be controlled. The
sandblast adapter tip is placed on one side of the tooth,
and high-speed evacuation is placed on the opposite side,
eliminating the messy cleanup of a plumbed-in unit.
The drawback to the handpiece adapter design is that
it utilizes a nonrefi llable tip that contains the aluminum
oxide powder. To avoid cross-contamination, a new tip
must be used for every patient or the tip can be sterilized
with a sanitizing wipe between patients (given this
sterilization technique is accepted). The primary benefit to
a sandblaster utilizing a dedicated plumbed-in air source is
a significant reduction in abrasive material costs because
of bulk availability. In addition, the volume of abrasive
powder contained in the refi llable jar eliminates the need
for changing preloaded tips. When mechanically preparing
only a crown or two, abrasive volume becomes a nonissue.
http://www.orthotown.com
Table of Contents for the Digital Edition of Orthotown November 2017
Orthotown November 2017 - Cover1
Orthotown November 2017 - Cover2
Orthotown November 2017 - 1
Orthotown November 2017 - 2
Orthotown November 2017 - 3
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Orthotown November 2017 - Cover3
Orthotown November 2017 - Cover4
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