Topics of the day:
1. Reply to Dr. Klemper about PowerBooks
In reply to Leon Klemper about using a PowerBook for ClinCheck and Orthotrac Office.
First I think that the PowerBooks are excellent computers, a bit expensive but are easy and fun to use. The included software is super and OS X an exceptionally stable working environment. (I'm on my iMac at home) About 4 months ago we installed a new server at the office running Win 2003 Server and Terminal Services. Microsoft offers a free Terminal client for Mac OS X so you can access the Win Server. With Terminal services all the Windows programs reside and run on the Terminal Server (a two Zeon processor, 1 gig memory, 68 gig drives (Raid 1 or 2 I think). All of our older machines which should be replaced are now running client software and are screaming fast. Everything that we need is on the big box upstairs and all is automatically backed up each night. The addition of the server has extended the life span of the clients for many years, effectively paying for the new hardware by not buying new desktops. Our Mac runs the client in a window just like the other computers and is virtually transparent to the system. Here is the really good news about this system, we have a static IP address and an always on connection to the internet (T-1). I can be at home, at an other office across town, at a hotel in Hawaii or any of my employees can use their home computers to get into the office system using the IP address. Its just like sitting at at a desk in the office. The speed at home is almost the same as the office so I have staff doing thinks like accounting, appointment juggling, letter writing. recalls. etc. from home when necessary (nobody gets a day off even when they are sick (I wish)). You can even run a handheld PDA, like on of the more expensive iPaqs, with a wireless connection and do all of the above with the admittedly small screen. I.e., view/run the Orthotrac program, check out patient photos or X-rays, write letters of email just as if you were in your office. Who knows how much you would use this, but the idea is "super cool."
Meanwhile, Virtual PC, works as advertised. You will notice a modest lag in speed due to the program overhead but the program creates a virtual PC inside your Mac. Now lets see a PC do that. Be sure to stock your PowerBook with at least .5 to 1 gig of memory to keep things running easily.
Ron Heiber, DDS, MS
Lancaster, OH DrHeiber@Mac.com www.BraceMeUp.com
Dear Dr Christensen,
I totally agree with you : a ligature under the arch wire will make it difficult to open the clips... why dont'you put your ligature over the archwire ? if you don't want to do it again at each appointment, I would suggest the use of Speed brackets. You keep your spaces closed by sliding, with the clips closed, a 016 SS in the auxiliary slot and cinch it ( you need a bit of training, but it comes naturally I think, for an experienced orthodontist). At each appointment, you will be able to change or modify the main archwire, without touching to the auxiliary one...
Dear Jean Marc,
The dog study done by our grad student will be published. The modified screws worked well with immediate load, but of course these devices often work well in dog bone. I hope a clinical trial with reasonable sample size will be published at some point.
A1 is a great camera for taking intraoral pictures. But you may complain that the body is heavy and the settings are complicated. Therefore, A1 has an anti-shaking system and 5 memory settings for you to easily keep your favorite settings.
Here're some settings we developed in Dept of Orthodontics, UIC for all residents to use. Everyone uses Minolta Dimage 7i or 7Hi, which are very similar to Minolta A1. Since we don't own an A1, you may have to refer to the user manual for more details.
1. Set the max zoom and enable macro, then turn the zoom ring counter-clockwise until it can't turn any more.
2. Follow the user manual. Set ISO to Auto, WB to auto (these should be on the function dial). Set PASM to A aperture priority (the Mode Dial). F-number to F8, F9.5 or F11 (turn the front control dial after the shutter button).
3. We recommend all orthodontists use MF (manual focus) and set the distance to be between 0.40cm to 0.50cm. However, if you or your assistants are not so comfortable with the focus ring, you can use AF.
4. Ring Flash
If you are going to use ring flash, get a Minolta Macro Flash 1200, which costs about $400. Follow the instructions on the user manual and you may need to adjust the F-number a little bit.
5. Built-in Flash
If you don't want to add another pound to this already heavy camera, you can use the built-in flash. But the shadow may become a problem. I never tried it myself, but here are two approaches you may want to consider:
a) Enable the anti-shaking function. Decrease the flash intensity and prolong the shutter speed. Then the long exposure may compensate the dark area somehow.
b) Enable the anti-shaking function. Enable slow flash. Adjust the F-number and shutter speed. You should have a bright image. If the image is too white, decrease the flash intensity and the image gamma.
6. Remember, when you are taking intra-oral using the built-in flash, the position of the pop-up flash should be opposite to the position of lip. For example, if you are taking the upper intra-oral pictures, you should hold the camera upside-down so that the upper lip doesn't block the built-in flash's light from getting into the mouth.
Above are just some summaries of the protocol we are using. I appreciate if you can give me other experience to the use of A1.
Dept of Orthodontics
University of Ilnois at Chicago
I read with interest the never ending discussion regarding digital photography.
I have, for many years used an (analogue) Olympus SLR, 100mm Macro Lens and TTL ringflash with consistent superb results.
Having been "burned" twice on non-reflex digital cameras I recently purchased a CANON EOS REBEL BODY, 100mm SIGMA AUTOFOCUS MACRO LENS and CANON TTL RINGFLASH. I am, AT LAST, replicating my analogue experience in digital with absolutely no fuss and bother! The camera body is incredibly light, and the system (which cost less than US$2000) is simply a pleasure to use!
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