Date: Tue, 26 Sep 2006 00:19:42 -0500
From: "ESCO automatic digest system" <LISTSERV@LISTSERV.UIC.EDU>
Subject: ESCO Digest - 21 Sep 2006 to 25 Sep 2006 (#2006-30)

There is 1 message totalling 1434 lines in this issue.

Topics of the day:
1. Tip edge torque 3


Date: Sat, 23 Sep 2006 19:05:27 +0200
From: "Marco Tribò" <marco.tribo@TRIBO.CH>
Subject: tip edge torque 3

Dear r.

I agree that the drawing explaining the torque action in my last posting could be misleading because in this perspective you would assume a contact between the bracket and the wire. In reality there should be no contact at this stage of treatment because a 0.0215 wire lies now in a 0.028 slot and so is not able to express a third order force. By the action of the additional 0.016 flexible wire the backet (tooth) will gradually upright and the 0.022 slot will start to close down on the 0.0215 wire and that's when the wire will get in contact with the slot and be able to exert a torquing force. The attached drawing shows a bracket like it would be placed on a distally tipped upper right central (left drawing) and a bracket on an correctly positioned upper right central (right drawing). You can see that due to the design of the bracket we will have two different slots in the same bracket depending on the tip of the bracket (tooth). This is the theory behind it, now we all know the difference that sometimes exists between theory and daily clinical work... I can assure you that the mechanical principles in Switzerland and in Indiana are the same. If it does not seem so to you, I am sure it is due to my poor mechanical understanding ;-)

Best regards
Marco Tribò