The Dent-Liner
Volume 6 Issue 3
Summer 2002
A BULLETIN DEALING WITH ISSUES FOR DENTAL HEALTH PROFESSIONALS
Outstanding
Bonding with the Silano Pen
The
Silano-Pen is not only a “mini silicoater” it is also a true innovation
in the field of bonding systems. Simple application and handling render
it suitable for both laboratory and clinical use. The bonding strength
values for almost all alloys and composites that can be achieved with the
pen are as good as the ones that can be obtained with conventional procedures.
The current initial results of the pen indicate that it permits the use
of an adhesive technique for both ceramic and composite restorations without
the necessity of performing complicated pre-treatment. The Silano-Pen is
a gas burner which is the size of an ink pen. A special gas which is enriched
with silanes is filled into the pen. When ignited the flame gives off small
elements which subsequently deposit as a silicate-like glassy layer on
the surface to be veneered. A very interesting and useful aspect of the
pen is the fact that almost all types of materials can be bonded. New research
results of the bonding strength and the areas of usage of the Silano-Pen
are published in issue No. 3 / 2001 “Quintessenz fur Zahntechnik” carried
out by Zentrum fur Zahnmedeizin, Charite / Berlin under the guidance of
Prof. Dr. H.J.Tiller and Prof. Dr.J.F.Roulet.
For a free copy of the research or further information on the
Silano-Pen, contact us at Dent-Line of Canada Inc via e-mail at info@dent-line.com
or call us at 1-800-250-5111 .
Retrievable Bridges with
Tap and Screw
In cases were we want to retrieve a bridge in the future, the Bridge
Sectioning Attachment can be utilized. This attachment can be used mesially
or distally to an abutment. The bridge sectioning attachment is a cylindrical
vertical tube which is manufactured from extruded plastic and burns out
in the furnace. It can be also adjusted to fit the gingival. Using the
paralleling mandrel, place the attachment to the abutment. After casting
the surface; the section connecting the attachment is milled smooth with
a 0 degree cutter and then polished. The Bredent Drill and Tap Tool Kit
contains ten components. This includes 2 taps, 4 drills, a screw driver,
a tap holder and two titanium screws. Select the center drill and create
the entrance point on the lingual of the attachment. This is to start the
next drill and prevent traveling. Take the multi-drill (1.2 x 5mm) from
the tool set and using the point of entry already created, drill a hole
2 mm into the attachment. Applying Bredent milling oil prevents the drill
from over heating and breaking. Next select the stop drill (1.2 x 2 mm)
to drill further into the hole precisely to the required depth. This fool
proof method allows room for the threaded screw. After this procedure the
counter-sinking drill is used to widen the existing hole to 1.4 mm to accommodate
the threaded screw and provide space for the tapered screw head. In the
next stage the first tap (1.4 mm) is fixed to the tap holder. The tapping
procedure is slow and methodical. Initially place milling oil into the
existing hole. The tap is placed into the hole and slowly twisted a few
times to the right. Then it is reversed slowly moving out the shards of
cut metal. This procedure continues until the tap has threaded the hole
completely. The initial thread is a coarse cut. Replace the first tap with
the second tap and repeat the procedure again. This last tap will refine
the threads so as to match up with the machined titanium screws provided
with the tool kit. The titanium screw has a deep hexagonal head that facilitates
the screw driver to secure the screw firmly to the attachment; the screw
should fit into the attachment by two to three mm. The screw head will
be exposed and should extend out lingually about 2.5 mm. The screw has
been designed to withstand shear forces up to 1550 Newton's. The implant
abutment will utilize the Security Lock System which will also ensure that
the entire bridge will be retrievable. The secondary structure can be started
at this stage. The best way to tackle the next step is to lubricate the
external area of the screw and the bridge sectioning attachment. Then start
to apply a modeling resin (Bredent Pi-Ku-Plast) around the whole area integrating
the screw into the pattern. The rest of the bridge is waxed including pontics
and the implant abutments. The complete waxed bridge should also include
the modeling resin pattern as well. Using the screw driver from the kit
remove the titanium screw from the attachment and safely secure it for
later. The bridge is sprued, invested, cast and then fitted. The abutment
crown and the rest of the bridge are trimmed to receive porcelain. After
the porcelain has been baked and before glazing, the titanium screw should
be fitted into the restoration. At this stage the head of the screw and
the porcelain can be blended together to complete the lingual anatomy.
Finish the final glaze and polish the restoration. The minimal dimensions
and lingual application provide pleasant aesthetics for all screw retained
restorations. Source: Peter T. Pontsa RDT
Comparing Effective Reline Procedures
Generally
speaking a reline is the resurfacing of the gingival area of a denture
with a new base material in order to increase retention. The reline can
address a number of problems that can exist simultaneously. An example
of this is tooth wear that is exhibiting progressive over closure involving
the patient’s vertical dimension as well as an indication of ridge resorption.
To remedy this, the practitioner modifies the denture by grinding out all
the tissue surfaces, undercuts and reducing the flanges about 2 mm. A new
impression of the arch is taken using the old denture, as a custom tray.
It is then processed in the laboratory. There are a number of acceptable
procedures on relining a denture such as the flask or jig method. Both
procedures can have multiple time consuming steps. This author will concentrate
on improving steps on the jig method of relining. The standards of practice
is to box and pour the impression using conventional beading and boxing
wax. After the master model is poured and set (45 min. to 1 hr.), the model
is shaped on a model trimmer and the base grooved (5 min). Next shape a
plaster patty on the bottom half of the standard two nut jig. Press the
occlusal surfaces and incisal edges into the mix and let set (30 min).
Afterward use sticky wax to attach the teeth down to the index. Mix the
plaster and attach the master model to the upper member of the jig and
allow the plaster to set (45 min). Disassemble the jig and gently separate
the denture from the model. On the master model cut a posterior palatal
seal. Paint an acrylic separating medium onto the model. Remove the impression
material from the denture base and create a butt joint at the dentures
peripheral margins. Apply a monomer to the tissue surface of the denture.
Mix and apply acrylic to the denture and to the model’s undercuts. Reassemble
the jig. Mold the acrylic around the borders and cure in a pressure pot.
Recover, trim and polish the reline. Although this is the standard
procedure, it can be improved upon. I would recommend starting out with
a Renfert Reline Unit since it is designed with three guidance bolts to
prevent tilting. It also prevents raising bites and transferring any errors
because of its sturdy mounting plates. All components are rust proofed
and a PTFE special coating prevents plaster sticking. This will save time
in cleaning and applying Vaseline coating. To increase efficiency the model
and index can be produced in one working step. The impression is taken
and a mixture of 50/50 plaster and stone is placed on the bottom of the
reline unit plate about 2 in (5 cm) high ensuring the mix is very stiff.
Next the mixture is vibrated into the denture. It is placed on the plaster/stone
mixture, teeth side facing upward. The plaster mixture is gently placed
on the occlusal surface and built up. The upper mounting plate is placed
and secured with the nuts. Extra mix is applied over top of the plate to
keep the index secure. This one step method will save more than one hour
of setting time over the conventional jig method discussed above. The flask
method will take even longer time.
Source: Peter T. Pontsa RDT. For
further information, call Dent-Line of Canada Inc. at 1-800-250-5111
or e-mail us at info@dent-line.com
Vario Stud VKS-SG
Castable Housings
We would like to remind all users of the SG attachment from Bredent
that a castible housing is available in both 2.2 mm and 1.7 mm ball sizes.
The housing is CAD/CAD designed and is manufactured from extruded plastic
which burns out in the furnace. You can sprue and cast in the alloy of
your choice. It can be soldered onto chrome partial or it can be incorporated
into acrylic since it has an extended tag for retention. This housing gives
the user more control over the outcome if the chrome casting is not made
in your laboratory. The housing can be utilized for new cases or old cases
that may require a repair or rebuild. For further details contact us at
Dent-Line of Canada Inc., toll free, at 1-800-250-5111.
Trade News: Dentist
Most Ethical / Future of Dentistry Report.
Dentists placed eighth on the list of the most trusted professionals.
This according to the Gallup Organisations annual public opinion poll on
honesty and ethics in U.S. professions. Fifty-eight percent of the poll's
respondents rated honesty and ethical standards of dentist's as “very high”
or “high”. According to the poll, the top 10 most trusted are: 1, nurses;
2, pharmacists; 3, veterinarians; 4, medical doctors; 5, grade and
high school teachers; 6, clergy; 7, college teachers;
8, dentists; 9, Engineers; and 10, policemen. The ADA Future of Dentistry
Report is now available on line at www.ada.org. Three years in the making,
the report describes the status of the dental profession, observes recent
trends, and envisions challenges dentist will face in the next five to
15 years and makes recommendations. Source: LMT To-Day, Jan. 2002
Vol. 18, No. 4.
Announcements: Mr.
Bernie Mullen, RDT
Dent-Line
of Canada Inc. is pleased to announce that Bernie Mullen, RDT is the recipient
of the first annual Dent-Line Achievement Award. On February 27th, at George
Brown College, Mr. Bernie Mullen, RDT was recognized for his contributions
to education and the profession in general. On behalf of Dent-Line of Canada,
Peter T. Pontsa, RDT presented the award.
Announcements:
George Brown College
Dent-Line
of Canada Inc. is pleased to announce that on February 8th, 2002,
Peter T. Pontsa, RDT met with the George Brown Third Year Dental Technology
Program students. Mr. Pontsa introduced them to milling techniques and
explained attachment placement as well as the theory behind the stress
breaking arm and how it prevents loading. Many of these enthusiastic students
tried their hand at milling while being offered guidance and encouragement.
The Dent-liner; Vol. 6, No. 3
Publisher: Peter T. Pontsa RDT
Editor: A. Van Breemen BA
E-Mail: info@dent-line.com
