Topics of the day:

1. ESCO - The Electronic Study Club for Orthodontics
2. Hemisecting deciduous second molars
3. Sassouni (5)
4. ESCO Digest - 16 Feb 2003 to 24 Feb 2003 (#2003-7)
5. Nikon 4500
6. Delar Bite Registration wax
7. Dentometer
8. Surgical Treatment Objective

Dear Colleague:

The Electronic Study Club for Orthodontics (ESCO) is a free forum for exchange of information and opinions among orthodontists, and for distribution of professional information, sponsored by the Department of Orthodontics, University of Illinois at Chicago.  Information distributed on this list-server is NOT edited or refereed, and it represents only the opinions of the writers of the individual messages. Such writers bear the sole responsibility for the content of messages they author.  Authors are required to verify information regarding other parties included in their messages.  

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Enjoy your reading!


Joseph H. Zernik, D.M.D. Ph.D.
Professor of Orthodontics

From: Charles J. Ruff [orthodmd@PREXAR.COM]
Sent: Tue 3/4/2003 7:58 AM
Subject: hemisecting deciduous second molars

Some years ago, Dr. Van der Linden published in a Quintessence monograph a technique on how to handle missing mandibular second bicuspids. This involved shaving the distal aspect of the deciduous second molar before the adult first molar erupted. Then after eruption of the first molar, the deciduous second molar was hemisected and the distal root removed. This allowed the first molar the opportunity to drift forward closing the space where the distal root of the deciduous second molar distal root was. By leaving the mesial root intact, you maintained the alveolar ridge width so that the space could then be completely closed once braces were done. If there wasn anterior crowding, the mesial root would be removed and this allowed the first bi to move distally and still maintain the width of the alveolus by leaving the distal root intact.

Of course, the deciduous second molar needed to have a pulpotomy done before the hemisection was done. For me up heah in Maine, that was a tough sell even though the average Maineah would have been better off with space closure rather than implants, etc.

At a recent AAO meeting, two Mexican orthodontists whose names I can't remember, presented a table clinic on 57 patients that they treated with Dr.
Van der Linden's technique except they did not do the pulpotomy. They merely hemisected the tooth and then let the vital root fend for itself.
They reported in the table clinic that this did not seem to make a difference. They also reported that they were hoping to have this material published in the AJODO but I have yet to see it.

My question for the group is "Does anyone know the name and/or city in which these two work." I would love to write them and learn more.


Charlie Ruff

From: PAUL JOHNSON [p8johnson@YAHOO.COM]
Sent: Fri 2/28/2003 1:54 PM
Subject: Sassouni

S 5

Clarification of how to locate “Center O”:

Attachment #1 is the tracing from S 1 (+/- 1/29/03 posting) with the “vertical lines between the most divergent planes.” This is a cobbling of how we were taught in the class and the way the analysis has evolved for me.

Attachment #2 is how the planes converge in the deep-bite skeletal case.

#3 is an open bite patient.

1. Location of Center "0"

The four planes (b,c,d,e) are prolonged posteriorly. They converge toward an area where the four planes are the most concentrated, and then they diverge. The center of this concentrated area is Center 0. To locate Center 0, draw vertical lines between the most divergent planes going posteriorly. These vertical lines will decrease in height while going posteriorly up to a point. Then either they remain equal for a short distance or start increasing in size. The Center 0 is located at the middle of the smallest vertical height (usually the planes converge toward an area of the size of a dime).

This material was copied from the class notes-the handout.


Paul Johnson

Tustin, CA

(Please click here to see the attachments)

From: MVanRossen@AOL.COM
Sent: Fri 2/28/2003 2:52 PM
Subject: Re: ESCO Digest - 16 Feb 2003 to 24 Feb 2003 (#2003-7)

to Charly Ruff  and dr Tsouria- Belaid

You are looking  for someone who knows the Burstone- Melsen  - Marcotte  segmented technique in Geneva ?
I 'm sure  Dr Jeaques  Beugnet  - 348 Avenue de Genève  in 01220  Divonne les Bains - in FRANCE ( but near the airport of Geneva.).  kwows all about that biomechanics: anyway he is an outstanding practitioner..---- tel (33) 4 50 20 31 30.
From Marc Van Rossen  - Mâcon France ( 140 km from Geneva)---  I am also very fond of this "real Newton" biomechanics...

Sent: Tue 2/25/2003 2:37 AM
Subject: Re: Nikon 4500

I use a Nikon 995 and the nice thing about this camera is that the flash is located directly above the lens so shadows are reasonable.
Does the slightly offset flash on the 4500 pose a problem - especially with side and occlusal shots?

What particular adjustment are you having trouble with focus? - I always shoot on manual focus and use the confirmation feature Or exposure: f/10 ?

John Mamutil <>

>>>>> Dear Group

I used to shoot with a Nikon 990, now got a Nikon 4500 but can't get a perfect adjustment. Is there anymore who can help?


From: Dr. Tim Dumore [Tim@DRDUMORE.COM]
Sent: Tue 3/4/2003 4:49 PM
Subject: Delar Bite Registration wax

Hello folks,

Recently, I have had trouble ordering Delar Bite Registration Wax. I have tried a few suppliers without much luck, and our Patterson Rep suggested that perhaps the company is discontinuing this product.

Does anyone know if this wax is in fact being discontinued? If so, any suggestions for a comparable product?

Tim Dumore


From: Dr. Tim Dumore [Tim@DRDUMORE.COM]
Sent: Tue 3/4/2003 4:51 PM
Subject: Dentometer

…should have asked this question in my last message! I have heard that the ‘Dentometer' band fitting aid would change my life if I ordered one, but I have not had much luck tracking down a supplier. Does anyone know if the hype is justified and if so, where I can get one?

Tim Dumore


From: Jessie Rances [jerances@COMPASS.COM.PH]
Sent: Tue 2/25/2003 8:10 PM
Subject: Re: Surgical Treatment Objective

there is a software that you can use called DOLPHIN

Jessie O. Rances