Thoughts From the Bench – Entry #4

June 5, 2018

In this edition of Thoughts From the Bench, I would like to explore with you the reason why I have three DEMCO Polisher/Grinders in the lab.

DEMCO Polisher/Grinder Model B-1

Each polisher/grinder is placed in different areas of the lab. In the model department, I use it to shape and bevel the model that was pulled from the impression, and ground down on the model trimmer. After pins are placed, and the base is poured, this polisher/grinder is used to refine the holes of the pins on the bottom of the base. A higher speed is used with a diamond separating disk to separate sections of the models. After sectioning, the individual dies begin the die-trimming process. I have found the DEMCO Polisher/Grinder is a wonderful tool, because no matter what part of the process I am currently involved with, I have the most control of the work piece. With the thumb and index finger of both hands, I am able to very carefully manipulate the die during the rough trim with an arbor band, followed by a secondary trim with a burr.

When using a hand-piece, one hand is holding the hand-piece; the die is held by only the thumb and possibly two fingers of the other hand. This is a not the firmest, or the most stable way of holding the work piece, and can result in an inaccurate trim. No longer do we ditch the dies in the process of trimming the margin. Especially, for those that are to be scanned.

The third phase of my die-trimming is done with a Bard-Parker scalpel with a #15 blade. During each one of these steps, I am wearing my 3.5 diopter loops.

-Kurt Culp, BFA, MA, CDT

Thoughts From the Bench – Entry #3

April 11, 2018

To update my use of the GC initial™ LiSi Press lithium disilicate:

I am having great results using the pressable ceramic. I am finding it very easy to work with, and I am confident in the quality of the finished restoration.

I became aware of a research paper that compares GC initial™ LiSi Press and IPS e.max Press.      GC initial™ LiSi Press outperformed the IPS e.max Press samples. If you wish to view the research and results yourself, click the link below:

International Journal of Development Research Vol. 07, Issue 11, pp.16711-16716, November, 2017

Next month we’ll have information describing our use of the recently acquired Smile Lite M.D.P. (#6600) from Smile Line USA.

-Kurt Culp, BFA, MA, CDT

Thoughts From the Bench – Entry #2

March 7, 2018

I attended the Chicago Mid-Winter Dental Lab Meeting on February 23rd & 24th, and I logged many hours in a variety of seminars over both days.

Several seminars highlighted cases of which GC initial™ LiSi Press lithium disilicate  was the primary material used, and I am even more excited about this product! I was very impressed by it’s color and strength!

I look forward to providing more information in future entries!

– Kurt Culp, BFA, MA, CDT

Below is the answer to Entry #1’s photo question.

PHOTO FROM ENTRY #1                                                                                                     Question: Which tooth is the Jensen Imagine® restoration?                                                Answer: TOOTH #5                                                                                                                     (Tooth #4 — PFM crown of unknown origin)

Thoughts From the Bench – Entry #1

January 26, 2018

Can you spot the Jensen Imagine® crown?
Answer in February’s blog entry! – Image Courtesy of Anthony Olson, DDS

We are celebrating 20 years in business and 35 years of experience in the industry! I am still very passionate about how I create restorations; from model work, to final inspection of the finished case. I am complimented for my consistently accurate die trimming, which is why I am able to finish a closed and exact margin.

Having had 4 years of experience using the 3M ESPE zirconia dyeing liquid has enabled me to achieve a very consistent reproduction of the requested shade. There are times where some adjustment to the shade is needed, but I am not dependent on stains to reproduce the tooth shade. It is very exciting to know that my use of Jensen Imagine® Zirconia provides a reproduction of translucencies that are seen in dentition and have the strength of 769 MPa!

Last year (2017) marked an important change in the lithium disilicate ceramics, with the expiration of the patent held in the United States. Several companies brought into the U.S. market, lithium disilicate systems that they have been selling outside of the U.S.. GC America’s initial™ LiSi Press has really impressed me, and I am using it as my lithium disilicate pressed material. Their ingot is made with proprietary HDM (High Density Micronization) technology. This results in a micro-crystal structure that fills the entire glass matrix. The flexural strength of this press restoration is >500 MPA; FAR BETTER than what was available under the U.S. patented product! I am very excited to be working with this new material, as well as the Jensen zirconias, to produce life like restorations!

-Kurt Culp, BFA, MA, CDT