Technical Article Quiz Sponsored by The Release of ... · Director of Removables for Bonadent...
1
Today, we have many choices for producing high-quality porcelain dentures. Recent studies show that the “Compression Packing Method” that originated in the 1930s is still the predominate method used for processing acrylics (80%) and results in upwards of 12% inaccuracy due to shrinkage. We now have more advanced methods of processing acrylic. Instead of pressing, injection is the most advanced technology. I will demonstrate cases using one of the best systems I know, the Heraeus Palajet with Palapress vario. To best understand and take advantage of this processing method, we need to understand the importance of the steps leading up to these advantages. Every step is important in the fabrication of the prosthetic appliance, including the impression, the bite registration, and the tooth arrangement using the Palameter and waxing. We must always remember that, for the patient and ourselves, “what you see is what you get.” The wax-up should represent what you want to see in the acrylic processing. One of the many unique qualities of the Palajet system is its ability to flask two dentures at the same time as opposed to the conventional labor-intensive method of one denture at a time. This saves time and adds consistency to the entire process. If you wish to colorize the gingival contours, you have the ability to use the same mix of colors at one time as opposed to two mixes. Although the Palapress vario is provided in several shades, including clear, I have chosen to mix colors to the client’s liking, so the colors are consistent. Another great thing about this method is that the wax elimination is quite the same as we have always used with a very clean boil out, a good separator, and the use of a tooth bonder. With Palabond, use a rough diamond to prepare the entire exposed tooth surface, then apply the Palabond and wait one minute. There is now a 10-minute window to inject the cases. The compression method was a great achievement over prior methods, but it still has many problems compared to our modern technology—in particular, its large amount of shrinkage and residual monomer. Ten minutes prior to processing your case, whether you use the injection method or the matrix technique shown later, Heraeus Palabond should be allied. This “Super Bonder’” is great for many uses in the dental laboratory and offers the maximum bonding of two acrylic surfaces as seen in tooth bonding, repairs, relines etc. The amounts of residual monomer are very important as this can lead to severe reactions to the patient as noted by many clinical studies. This seems to be quite an issue with “pour-type” acrylics and for any acrylic that contains increased amounts of residual monomers. The entire system is quite simple as is the injection process. Insert the flask and apply air pressure until the vent extrudes the base material; close the vent and allow pressure for 5 minutes. This system is more efficient than the conventional compression-packing method. It is constantly filling the mold. Any possible shrinkage will take place while the material is curing. In compression/press packing there is not a constant feed of acrylic, which can result in more shrinkage in the final case. Questions: 1. What is the predominate method used for processing acrylic dentures today? a. “Compression Packing Method” b. wax buildup c. none of the above 2. Which step is important in the fabrication of the prosthetic appliance? a. impression b. bite registration c. tooth arrangement d. all of the above 3. Using the Palajet system you have the ability to flask two dentures at the same time. a. true b. false 4. What is a main problem with using the “Compression Packing Method”? a. color b. fit c. shrinkage and residual monomer 5. After the case is injected, what temperature should the flask be placed at? a. 550 Celsius b. 900 Celsius 6. Where is the Palapress vario mixed and poured? a. occlusal b. buccal c. open space in the lingual 7. What is the % of inaccuracy using the compression packing method? a. 8% b. 10% c. 12% d.14% 8. The wax-up should represent what you want to see in acrylic processing. a. true b. false 9. One of the advantages of using the Palajet system is the ability to use the same mix of colors at one time as opposed to 2 mixes. a. true b. false 10. One of the benefits of the Palajet system is that the heat and pressure- cured acrylic, cures at a lower heat than boiling allowing the technician to deliver the case on the orginal model eliminating the need to duplicate the master model. a. true b. false CDT Contact Information Name____________________________________________________________________________________ Laboratory Name __________________________________________________________________________ State ____________________City __________________________________ Zip________________________ CDT # (required) __________________________________________________________________________ E-mail ______________________________________________________________________________________________ (for confirmations only) Technical Article Zahn Dental • CDT Quiz • May/June 2012 Quiz (Circle your answers) After the case is injected, place the flask into the Palamat Elite for 25 minutes under pressure at 55 degrees Centigrade. Once cured, allow cooling at room temperature and de-flask. The finishing of the denture case should be minimal and replicate the technician’s expert input and offer the result that the doctor and patient have approved. Another benefit of the Palapress vario is the partial denture technique “Putty Matrix.” In this technique, the partial denture is set and waxed then silicone putty is applied to the buccal and occlusal areas. The wax is eliminated and the teeth prepared as discussed previously. The Palapress vario is mixed and poured into the open space in the lingual area. This technique saves time and is less stressful than press packing with less chance of distortion and, can be performed at the technician’s bench. One of the foremost benefits of this entire system is that, although it is a heat-and- pressure-cured acrylic, the heat is less than at the boiling point. This means that a technician can fabricate a complicated implant and attachment cases by blocking out any areas that would normally have to be fabricated using inaccurate duplicate models or relieve acrylic internal post processing—a much more difficult process. This also allows the delivery of the case on the original model, with no need to go through the entire time-consuming task of duplicating the master model. Receive .5 point documented Scientific credit for passing the above quiz about this article. Return a completed quiz and contact information to Zahn Dental Marketing via mail, fax, or E-mail at the following addresses: Zahn Dental, 135 Duryea Road, Melville, NY 11747; fax to (631) 390-8179; e-mail to: [email protected]. This quiz has been provided and approved by NBC (National Board for Certification). You must provide all information above to ensure you receive credit. Previous participants may not have earned the .5 credit due to missing information or new state requirements. A copy of this quiz has also been posted on the Zahn Dental Web site @www.zahndental.com/quiz; click on CDT Quizzes. T.G. Hornischer Jr., C.D.T., is the recipient of the NADL’s Excellence in Education Award and Merit Award. Mr. Hornischer is currently Technical Director of Removables for Bonadent Dental Laboratories, a full-service dental laboratory. He has completed numerous implant and prosthetic courses, and conducts courses in the U.S., Canada, and Europe. T.G. Hornischer Jr. CDT The Release of Residual Monomeric Methyl Methacrylate in Human Saliva after Using Acrylic Dentures
Transcript of Technical Article Quiz Sponsored by The Release of ... · Director of Removables for Bonadent...
43MAY/JUNE SALE Z TO ORDER CALL: 1-800-496-9500
Today, we have many choices for producing high-quality
porcelain dentures. Recent studies show that the
“Compression Packing Method” that originated in the
1930s is still the predominate method used for processing
acrylics (80%) and results in upwards of 12% inaccuracy
due to shrinkage. We now have more advanced methods of
processing acrylic. Instead of pressing, injection is the most
advanced technology.
I will demonstrate
cases using one of the
best systems I know,
the Heraeus Palajet
with Palapress vario.
To best understand
and take advantage of
this processing
method, we need to understand the importance of the
steps leading up to these advantages. Every step is
important in the fabrication of the prosthetic appliance,
including the impression, the bite registration, and the
tooth arrangement using the Palameter and waxing. We
must always remember that, for the patient and ourselves,
“what you see is what you get.” The wax-up should
represent what you want to see in the acrylic processing.
One of the many unique qualities of the Palajet system is
its ability to flask two dentures at the same time as
opposed to the conventional labor-intensive method of one
denture at a time. This saves time and adds consistency to
the entire process.
If you wish to colorize the
gingival contours, you have
the ability to use the same
mix of colors at one time as
opposed to two mixes. Although the Palapress vario is
provided in several shades, including clear, I have chosen
to mix colors to the client’s liking, so the colors are
consistent. Another great thing about this method is that
the wax elimination is quite the same as we have always
used with a very clean boil out, a good separator, and the
use of a tooth bonder. With Palabond, use a rough
diamond to prepare the entire exposed tooth surface, then
apply the Palabond and wait one minute. There is now a
10-minute window to inject the cases.
The compression method was a great achievement over
prior methods, but it still has many problems compared to
our modern technology—in particular, its large amount of
shrinkage and residual monomer.
Ten minutes prior to processing your case, whether you
use the injection method or the matrix technique shown
later, Heraeus Palabond should
be allied. This “Super Bonder’”
is great for many uses in the
dental laboratory and offers the
maximum bonding of two
acrylic surfaces as seen in tooth
bonding, repairs, relines etc.
The amounts of residual monomer are very important as
this can lead to severe reactions to the patient as noted by
many clinical studies. This seems to be quite an issue with
“pour-type” acrylics and for any acrylic that contains
increased amounts of residual monomers.
The entire system is quite simple as is the injection process.
Insert the flask and apply air pressure until the vent
extrudes the base material; close the vent and allow
pressure for 5 minutes. This system is more efficient than
the conventional compression-packing method. It is
constantly filling the mold. Any possible shrinkage will take
place while the material is curing. In compression/press
packing there is not a constant feed of acrylic, which can
result in more shrinkage in the final case.
Questions:1. What is the predominate method used for processing acrylic dentures
today?a. “Compression Packing Method”b. wax buildupc. none of the above
2. Which step is important in the fabrication of the prosthetic appliance?a. impressionb. bite registration c. tooth arrangementd. all of the above
3. Using the Palajet system you have the ability to flask two dentures at thesame time.a. trueb. false
4. What is a main problem with using the “Compression Packing Method”?a. colorb. fitc. shrinkage and residual monomer
5. After the case is injected, what temperature should the flask be placed at? a. 550 Celsius b. 900 Celsius
6. Where is the Palapress vario mixed and poured?a. occlusalb. buccalc. open space in the lingual
7. What is the % of inaccuracy using the compression packing method?a. 8% b. 10%c. 12%d.14%
8. The wax-up should represent what you want to see in acrylic processing.a. true b. false
9. One of the advantages of using the Palajet system is the ability to use thesame mix of colors at one time as opposed to 2 mixes. a. true b. false
10. One of the benefits of the Palajet system is that the heat and pressure-cured acrylic, cures at a lower heat than boiling allowing the technicianto deliver the case on the orginal model eliminating the need to duplicatethe master model.a. true b. false
CDT Contact Information
Name____________________________________________________________________________________
Laboratory Name __________________________________________________________________________
State ____________________City __________________________________ Zip________________________
CDT # (required) __________________________________________________________________________
E-mail ______________________________________________________________________________________________(for confirmations only)
Technical ArticleZ
ahn Dental • C
DT
Quiz • M
ay/June 2012 Quiz (Circle your answers)
After the case is injected, place the flask into
the Palamat Elite for 25 minutes under
pressure at 55 degrees Centigrade. Once
cured, allow cooling at room temperature
and de-flask. The finishing of the denture
case should be minimal and replicate the
technician’s expert input and offer the result
that the doctor and patient have approved.
Another benefit of the Palapress vario is the
partial denture technique “Putty Matrix.” In
this technique, the partial denture is set and
waxed then silicone putty is applied to the
buccal and occlusal areas. The wax is
eliminated and the teeth prepared as
discussed previously. The Palapress vario is
mixed and poured into the open space in
the lingual area. This technique saves time
and is less stressful than press packing with
less chance of distortion and, can be
performed at the technician’s bench.
One of the foremost benefits of this entire
system is that, although it is a heat-and-
pressure-cured acrylic, the heat is less than
at the boiling point. This means that a
technician can fabricate a complicated
implant and attachment cases by blocking
out any areas that would normally have to
be fabricated using inaccurate duplicate
models or relieve acrylic internal post
processing—a much more difficult process.
This also allows the delivery of the case on
the original model, with no need to go
through the entire time-consuming task of
duplicating the master model.
Receive .5 point documented Scientific credit for passing the above quiz about this article. Return a completed quiz and contact information to Zahn Dental Marketing via mail, fax, or E-mail at the following addresses: Zahn Dental, 135 Duryea Road, Melville, NY 11747; fax to (631) 390-8179;e-mail to: [email protected]. This quiz has been provided and approved by NBC (NationalBoard for Certification).
You must provide all information above to ensure you receive credit. Previous participants may not have earnedthe .5 credit due to missing information or new state requirements.
A copy of this quiz has also been posted on the Zahn Dental Web site @www.zahndental.com/quiz; click on CDT Quizzes.
T.G. Hornischer Jr., C.D.T., is the recipient of the NADL’s Excellence in Education Award and Merit Award. Mr. Hornischer is currently TechnicalDirector of Removables for Bonadent Dental Laboratories, a full-service dental laboratory. He has completed numerous implant and prosthetic courses, andconducts courses in the U.S., Canada, and Europe.
T.G. Hornischer Jr. CDT
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