Date: Fri, 23 Mar 2007 00:34:23 -0500
From: "ESCO automatic digest system" <LISTSERV@LISTSERV.UIC.EDU>
Subject: ESCO Digest - 21 Mar 2007 to 22 Mar 2007 (#2007-31)
To: ESCO@LISTSERV.UIC.EDU

There are 3 messages totalling 274 lines in this issue.

Topics of the day:
1. Upper molar translation brackets
2. Re: Finishing with Class III molars
3. Finishing with Class II molars

 

Date: Thu, 22 Mar 2007 10:39:14 -0700
From: "Dick Carter" <drdcarter@MAC.COM>
Subject: upper molar translation brackets

Regarding the question of what brackets to use on cases with two upper extractions:
1.  Andrews' original SERIES of prescriptions has brackets expressly designed for the need to rotate molars forward slightly in these cases.  They are close to zero degrees offset.
2.  An easy solution to the problem of bracket inventory is to simply use LOWER molar brackets in these cases.  Yes, there is slightly excessive torque, but that is not always bad, and can be overcome by using less than full size arches to finish
3.  Another simple solution is to finish on an 016 round arch with an elastomeric chain from molar to molar, which will rotate molars and close spaces tightly
Finally, when molars are finished in class 2 positions, the transverse ridges of the uppers are automatic occlusal interferences, and must be equilibrated.  It's easy if you think of making a premolar shape out of the mesial of an upper molar; just create a spillway by reducing the transverse ridge.  Some dentists criticize the creation of "plunger" lingual cusps, but I have never seen any periodontal problemsw as a result.  These critics usually don't like extractions for any reason.

Dr Dick Carter
Orthodontist
Portland OR USA

 

Date: Thu, 22 Mar 2007 06:06:51 -0500
From: "Joe" <jsmileb@NETWURX.NET>
Subject: Re: Finishing with Class III molars

This is an interesting topic.  Do not want to take the time to think it through, right now, but, let's keep this topic open.

----- Original Message -----

From: blair adams
Sent:
Monday, March 19, 2007 7:38 PM
Subject:
Finishing with Class III molars

Hello; I am aware of the trend to increased rotation or offset built into our upper molar brackets. However I am also aware that in Class III cases and also in cases where premolars have been extracted only in the upper arch (no lower extractions), this rotation is not desirable. Could anyone recommend a rotation value to use in these cases? Would it be zero degrees? Would the 2nd molar have the same rotation as the first or would it benefit from slightly more? I'm fascinated to see what you all come up with. Blair Adams, Ottawa Canada

 

Date: Thu, 22 Mar 2007 18:47:55 +1000
From: "Anthony Shields" <tshields@BIGPOND.NET.AU>
Subject: Finishing with Class II molars

Hi Blair

If I intend finishing with Class II molars after extracting upper premolars (or closing space with missing upper laterals) I place the lower second molar attachment on the contralateral upper first and second molars. I use Unitek's MBT prescription where the lower “seconds” have zero rotation and zero tip (angulation) with –10 torque this fits my requirements fairly well and no extra inventory to carry.

Finishing with Class III buccal segments (for me at least) is very unusual so I don't have a ready fix for you. I will however place contralateral brackets on lower canines if I am trying to camouflage a mild Class III.

Hope this helps

Tony Shields
Brisbane
Australia