Okay, I think you have two problems:
1. If your zencart is in the top level root domain, your htaccess would just be this:
RewriteBase /
But if you have your zencart in a subfolder (as yours appears to be?), it would be this:
RewriteBase /YOURSUBFOLDER/
So if your subfolder is 1index.php it would be;
RewriteBase/1index.php/
But that is wrong, for problem no. 2...
2. Your apparent subfolder - 1index.php - isn't a subfolder at all but a file of some kind. If you want your zencart to be in a subfolder, you will need to make an actual subfolder, calling it what you want your zencart to be: perhaps "store"? So your zencart would be in this subfolder and it's url would look something like this:
http://dowelldentalproducts.com/store
But why do you have the Magic Zoom stuff at your top level instead of your zencart store?
Below I copied a portion of my htaccess which I am using on a zencart in a sub-folder, one of my test sites.
##### NOTE: Replace /shop/ with the relative web path of your catalog in the "Rewrite Base" line below:
Options +FollowSymLinks
RewriteEngine On
RewriteBase /zencart-demo/
PS: Later things you might look at is if you're going to use the www. in your urls or not. But you can get this resolved first.
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