Saturday, February 13, 2010

CAD/CAM Restorations

What is the history of CAD/CAM usage in Dentistry?
CAD/CAM was invented in the mid 1980s, but it was very cumbersome, and something of a luxury that took exorbitant expenses and time to produce results. It could only be used in select dental laboratories. Over time, the advances in computer technology and software made chair side CAD/CAM restorations possible. This new procedure lets dentists create dental prosthetic restorations in a matter of hours.

Many dentists feel it benefits the patient to have everything done in one dental visit. It does away with the need to fit the patient with a temporary crown and have to return for a second visit where the permanent crown is placed.

However, this can make a dental visit very expensive as well. If we were to have a CAD/CAM machine in our office, we would have to charge you more to cover the cost of maintaining it. We prefer to save you some money by doing what we can to lower your dental bills somewhat. We therefore outsource the actual CAD/CAM machining of your cosmetic dental restorations to a partner dental lab. True, you do have to come back for a second visit, but you get the superior results at a more affordable rate than you would if we did everything in-house.

What factors determine the cost?
The cost of CAD/CAM restoration depends on several factors:

· The type of restoration we are creating
· The material we use to create the restoration
· The cosmetic expectations of the dentist
· What your dental insurance is willing to cover and not cover

What type of cosmetic dental work can you do with CAD/CAM technology?
We can build cosmetic dental crowns, dental bridges, and dental implants. CAD/CAM is very useful in doing full mouth restorations that combine advanced dental bridgework with selective use of dental implants as anchor points for bridges.

Will the finished product be strong and cosmetic?
Yes. CAD/CAM restorations are normally all porcelain. They look like natural teeth, and they can withstand normal biting forces just like real teeth do. All-porcelain crowns do not have the metal core of previous generations of crowns, which makes them look practically identical to tooth enamel.

It is also healthier for your gums, because the crown sits just above the gum line with no metal to irritate the tissue.

How does the CAD/CAM restoration process done at the Houston Medical Center Dental Group?
We start by making you feel comfortable. Our standard procedure is to numb the area around your tooth so you will not feel any pain while we work on it. We also place a shield called a rubber dam across the back of your mouth that protects your esophagus and trachea from any dental debris that may fall into your throat during the removal of decay can the reshaping of your tooth surface.

Next, we remove decay and shape the tooth with a dental handpiece. We apply a reflective powder to the tooth and take a digital image of it. These images are then sent to the lab, where the CAD/CAM computer can see the most subtle of tooth surface contours and determine the dimensions of an exact replica of the tooth.

The lab feeds all this data into a milling machine that creates a custom-fitted restoration. When this is sent back to our office, we call you in and make sure you CAD/CAM restoration fits. We color it appropriately to match its appearance to surrounding teeth. We check your bite and make all necessary final adjustments, and then we bond your restoration permanently in place.

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Monday, December 28, 2009

How the CAD/CAM System Helps Us Make Cosmetic Tooth Restoration Materials

Making tooth restorations used to be a very complex and arduous process. Not only did dentists have to get the size of the restoration right, they also had to match the color of the restoration to that of the existing teeth surrounding it.

Now, when a tooth needs to be restored, Houston dentists can use the CAD/CAM system to aid in the procedure. The letters in “CAD/CAM” stand for “computer aided design” and computer aided manufacturing. This procedure is done in a CAD/CAM milling machine.

This machine is used to custom-design and to manufacture a number of cosmetic dental materials. These materials include tooth-colored restorations, dental crowns, dental onlays, dental inlays, and porcelain veneers.

Due to the precision of this sophisticated machine, CAD/CAM can produce some of the very best cosmetic dental solutions available to patients today.

There are several advantages to the CAD/CAM SYSTEM. These advantages include, but are not limited, to the following:

They are extremely accurate.
Most of the tooth’s structure is left intact because only a minimal amount of tooth preparation is necessary.
The colors of the restorations look identical to the color of teeth.

The CAD/CAM system involves a number of steps

Step One:
The area around the restoration is numbed in order to make you comfortable. A rubber dam is placed in your mouth to protect your throat from any dental debris that may be created while we work in your mouth.

Step Two:
Decay is removed and the tooth is shaped with a dental handpiece.

Step Three:
The dentist makes a mold of a tooth that will later be sent to a lab that has the CAD/CAM system in place.

Step Four:
The dentist sends this data to the lab where the CAD/CAM machine is located. At the lab, the optical, infrared camera of the CAD-CAM system reads the details of the molds and creates a virtual, digital image of the tooth. This image is identical to the dimensions of your natural tooth.

Step Five:
The lab will then place the specified material into the milling machine, The special software in the computer, along with the detailed image and tooth restoration material, will then be used to manufacture your cosmetic dental fitting.

Step Six:
The dentist will then choose the most appropriate restoration for your tooth. He or she will also match the color of that restoration to your existing natural teeth.

Step Seven:
When you return to the office, we will fit you with the new restoration. At this time, we will add any necessary custom coloring and bond the restoration in place with cement. We will check your bite and make any final adjustments, then polish the restoration to make it blend with the surrounding teeth.

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