Is It Customary to Be Charged for "Por Margin" in Addition to the Cost of a Crown?

The answer to this question is easy in my office and it is NO!  Our crowns are all porcelain so all of the margins in my office are made of porcelain.  Why would I charge you extra for what I do on every crown in our office.  In your case, my guess is that you went into a managed care office where the base crown is porcelain-fused-to-metal.  This means that you end up with the dreaded "dark line" at the top of your crown.   They will charge an extra fee to make the metal "all porcelain".  You can't fault them for this as they run on extremely thin profit margins and must charge this due to lower limits insurance companies pay on HMO plans.  Insurance is not a factor in our office, therefore we have the ability to charge a fee and give the patient the best quality product that dentistry has to offer without the extra "porcelain margin" charge. 

What you had placed is a Porcelain-fused to high noble metal. This is the most common and long term proven crown we use in dentistry. If done properly it can last for many years due to the noble metal support under the porcelain.

The Porcelain margin means that in the front part of the crown (the part that faces the lips/cheecks) at the gum-line is made of pure porcelain to enhance the esthetic look. It minimizes that gray line that some crowns show. The lab technicians that make the crowns charge extra for this.

A porc fused to metal crown without a porcelain margin ( called porcelain-to-metal margin)means that the metal and the porcelain finish at the same point and a slight gray line may be visible from the metal if it is not well hidden by the gum.

I see nothing wrong with this charge but you should have been told about it before it was done.

Hope this helps

Dr. T

Sometimes, depending on your gumline and where the tooth is located that is to be crowned, your dentist will request that the lab extend the porcelain past the metal work of the crown.  This is done so the metal margin of the crown will not be visible creating an unattractive black line at the gum area. It looks a lot more natural and you will have no black line a long your gum. This is more involved for the dental lab to do and they charge the dentist more and consequently, the cost is past on to you. If it were my mouth, I would be happy to pay considering you want the crown to look natural when you smile