Topics of the day:

1. A few MORE words on lingual retainers
2. DVD
3. Digital Camera Settings
5. acrylic - toxic?
6. JCO April 2005
7. ESCO - The Electronic Study Club for Orthodontics


Subject: A few MORE words on lingual retainers
Date: Mon, 16 May 2005 22:40:28 -0400
From: "Speck, Morton " <>
To: "Study Club" <>

Dear Colleagues

I can think of few procedures with less merit than the use of twist wire as a lingual retainer. With all of its deficiencies ably described by others, I see no justification for its use. Furthermore, because of its inherent weakness, you are committed to the bonding of all of the incisors, even those which were never misaligned. Why would you do that when you are not only increasing your chances of bond failure, but also not exactly ingratiating yourself with your referring dentist and his/her hygienist?

One highly doubtful reason for the use of twist wire is that the functional movement it affords is somehow necessary for the health of the attached teeth. That is extremely questionable when one considers the long term health of multiple splinted teeth. There seems to be no sound reasoning for the use of any flexible type lingual retainer.

I believe a perio/ortho colleague of mine has it right. For over 25 years he has used Almore Internationalâ€s Markely finely threaded wire. It is extremely stiff and available in various sizes. The threading lends itself to the retention of bonding material if you feel the need to bond individual incisors. He will frequently make small preparations in the approximating marginal ridges of maxillary incisors and imbed this wire with composite for permanent retention.

I strongly favor Zachrissenâ€s method of 3-3 retention. I feel the method described by Greg Scott also has much merit. (ESCO 12 April 2005). Generally, I do not favor the bonding of individual incisors. I feel the very minor relapse which may occur with a well fitting 3-3 is far outweighed by the many disadvantages of multiple bonding. Where there has been little if any initial irregularity, I favor a removable Hawley and suggest very minor stripping for overly tight contacts, a procedure that should be considered with any retention regime.

We all should look at the patients†models before debonding to be certain that all rotations have been fully corrected or overcorrected. Furthermore, very slightly offsetting your brackets where necessary at the initial bonding will assist your rotation correction and ultimate retention.

I realize I have expressed some definite ideas here, but experience will do that. I look forward to any of your remarks in response.

Mort Speck


Subject: DVD
Date: Fri, 20 May 2005 21:26:38 -0400

When the world ran on videotape, it was rather a simple matter to grab part of a videotape and convert it to digital and then to use it in a Powerpoint presentation. Typically, you might use part of a commercial to illustrate a point or to lighten the moment at the end of a section.

Can the same thing be done with a DVD? I have access to both Windows and Macs.

Charlie Ruff


From: "Richard B.Hirsch" <>
Subject: Digital Camera Settings
Date: Tue, 17 May 2005 05:44:27 -0400

Does anyone have the following digital system?  

Canon (EOS 20D, 100mm macro and ring flash)

I have been using this system with the following settings, but the pictures seem too light:
ISO = 200
(M) Manual setting
F 5.6 portrait
F 22  close up
Flash set on ETTL and +1 2/3 flash exposure compensation

Does anyone have any suggestions to obtain more natural looking gingival and skin tones, or to darken the pictures? It seems the flash is putting out too much light? Thanks!

Richard Hirsch
Tampa, Fl.


To: "" <>
From: "Jeffrey Mastroianni" <>
Subject: GERD
Date: Thu, 12 May 2005 10:19:03 -0500

I have an adult patient who was recently diagnosed with Gastroesophageal Reflux Disease. He presents with the lingual surfaces of the maxillary teeth appearing to have almost been melted away. My problem is with the facial surfaces of the mandibular premolars. They have been affected by the acid and look to have enamel of poor quality. Will traditional bonding techniques work on this type of patient? Aside from banding those affected teeth what recommendations can you make?

Jeffrey Mastroianni DMD MS
Glen Carbon, IL


Date: Wed, 11 May 2005 19:46:16 -0400
From: "Elliot Taynor" <>
Subject: acrylic - toxic?


A parent of a patient, who is a scientist, noticed that the acrylic overlays on a removable expansion appliance had wear facets and even a perforation. She asked if acrylic is toxic to the body and where does it go. What is the correct answer?

Thanks, Elliot Taynor,
Port Jefferson, NY


Subject: JCO April 2005
Date: Wed, 11 May 2005 10:54:29 -0600
From: "Wendy Osterman" <>

JCO April 2005 issue.
Open the attached PDF for the current Journal of Clinical Orthodontics table of contents. The Editor's Corner ("Adult Treatment in the 21st Century") and other articles are accessible at .

JCO Staff
Journal of Clinical Orthodontics



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