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How Your Dentist With Perfect Molds During The Crown Creation Process

If you crack a tooth or need a root canal, then you may also need a dental crown. Dental crowns are used to rebuild, reshape, and protect the teeth when they are too brittle or weak to be left alone. Usually, your dentist will advise for the placement of a porcelain device. Porcelain looks very similar to dental enamel, and a color guide will be used to make sure the crown matches the tone of the other teeth in the region. Before a crown can be made though, your dentist will need to take impressions of the mouth with a vinyl polysiloxane (VPS) material.

For dental crowns, a full bite impression will typically be taken. However, you may notice your dentist taking multiple impressions during your visit. Often times, this occurs due to general difficulties with the impression matrix itself. Dental crowns must fit well to properly restore a tooth, so new impressions will be taken until the mold represents your tooth accurately. If you are curious about the different types of problems that may occur when an impression is created, then keep reading. 

Tearing of the Mold

Sometimes, your dentist will see tearing across the sides of the bite impression when the mold is removed from your mouth. This may occur if your dentist removed the mold from the mouth too quickly. When this happens, wet or pliable edges rip as they stick to the teeth and gums. To prevent this from occurring again, your dentist will likely create a thicker or more viscous mold material the second time around.

Typically, your dentist will use three or more separate mold materials in his or her office depending on application. The viscosity of these materials range from a light putty to a thicker rubber type of substance. Light putties are often used to create impressions for crowns and bridge devices, since these dental appliances are often shaped with a dental drill to create the perfect bite after they are cemented in place. If the mold tears or rips, then your dentist will use a more rubbery or viscous mold material. This type of putty is generally reserved for times when more precise applications are needed, like in the case where dental implants and orthodontic appliances are created.

Voids and Indentations

In some cases, your dentist will see small voids or indentations in the created mold. This usually happens when a an abundance of moisture builds in the mouth. This moisture pools around the teeth and forces the matrix material to shift out of place. This usually occurs due to the build up of your own saliva and water that has been utilized to rinse out your mouth. Your dentist can fix this issue by making sure to place gauze in your mouth while the VPS starts to cure. When the mold material is ready, the dentist can then use a light burst of air to make sure the teeth are dry.

Also, to ensure proper removal of the mold tray, your dentist may opt to use a dental cord. A dental cord is a small string or twine that is placed in between the teeth. When the cord is secured across the mouth in an area where the dental mold does not need to be as accurate, it can be pulled up to release the tray and the dental putty without compromising the detailed impression around the crown tooth. This method of removal can be used to keep voids to a minimum and it can be utilized to reduce tears, drag marks, and other types of surface imperfections as well.

If you need a tooth rebuilt with the assistance of a dental crown, then you may notice your dentist taking multiple impressions of your bite. Sometimes this is required if the mold is not perfect the first time around. The information above will help you to understand why this may be the case and how your dentist will fix the issue. 

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