Dental X-rays can be taken to evaluate the teeth for decay under dental fillings or even between teeth. If a filling has failed or decay is detected on the X-rays, the fillings will have to be replaced. If the recurrent decay is extensive, a dentist may need to use a crown to replace the filling.
Unfortunately, tooth decay can still happen underneath a filling, especially if the filling has been cracked, worn, or otherwise damaged. In these cases, bacteria can enter your tooth and a new cavity can start again.
Symptoms of tooth decay under a crown
Inflamed, swollen gums. Increased tooth sensitivity. Toothaches or pain. Visible grey or brown spots at the base of the tooth.
Usually there is metal underneath the porcelain or the crown is made entirely of metal. This metal makes it impossible for the tooth structure inside of the crown to be seen on a radiograph (x ray). When decay under a crown is small, it is often difficult to detect.
Fixing a Cavity Under a Dental Crown
If a cavity is along the margin of a dental crown and does not go very deep into the tooth, it might be able to be fixed with normal dental filling material. In most other cases, the dental crown probably will need to be removed, the cavity filled, and a new crown placed on top.
There is no single number of how many times you can have a filling replaced. Usually, we will stop replacing the dental filling after the hole becomes too large. Once you have more filling material than natural tooth material your tooth no longer holds enough strength.
A patient with resin fillings may need to replace the fillings every seven to 10 years. Silver or amalgam fillings are also popular due to their durability and affordability, lasting an average of 15 years. Gold fillings are less popular because they are more expensive. However, gold fillings can last the longest.
Can I Prevent Cavities from Forming Under My Filling? You can prevent cavity formation with proper oral hygiene regimens, including brushing your teeth twice per day and flossing daily. You should also take care of your dental work so that fillings can continue protecting vulnerable parts of your teeth.
For the patient, a filling replacement will not feel any different from any other dental work. The local anesthetic ensures that you do not feel any pain during the procedure. After removing the old silver filling material, your dentist prepares the tooth for the new filling, onlay, or dental crown.
Visible holes or pits in your teeth: Cavities form tiny openings in teeth that gradually become larger. Discoloration: Teeth with cavities may appear yellow, brown, or black. Pain: Throbbing pain in your teeth is usually a sign of an infection, which means the cavity has reached your tooth's pulp (center).
The dentist can remove an amalgam filling using an evacuator. This piece of equipment is a powerful suction system that can remove mercury vapors and amalgam particles. An evacuator must always be turned on during the removal of an amalgam dental filling.
In general, adults develop an average of three cavities during their lifetimes. This means that the average adult has three or four fillings in their mouth. Some patients end up with ten or more fillings depending on how well they care for their teeth.
If a filling isn't replaced within a few days, it could cause damage to the unprotected tooth. Bacteria and food particles can stick into the empty space, causing decay. Also, the missing filling can expose dentin, the second layer of tooth under the hard outer enamel.
The silver (amalgam) fillings that were used for many years contained a mixture of metal alloy containing, silver, tin, copper and mercury. As with many metals that are exposed to a wet environment they will begin to break down and oxidize, often times turning black.
Typically, fillings last around 10 years. Many restorations (the clinical term for dental fillings) last much longer. In addition to the materials used, other factors affecting the life span of a filling include: your eating habits.
Composite fillings are made from a resin designed to match the color of tooth enamel. They aren't as noticeable as metal fillings, but they are less durable. Composite fillings may cost between $150 to $300 for 1–2 teeth or $200 to $550 for 3 or more teeth.
Developing a cavity underneath your crown may cause you to experience pain within your tooth. If left untreated, it may spread throughout your remaining tooth structure. Decay stems from the food that is left within your mouth after eating, which the bacteria living in your mouth thrives on.
A cavity under a crown can be difficult to treat, and may require a root canal. Your dentist will likely recommend removing the infected tissue from your tooth if the cavity has become infected. After a root canal, you will need to have another crown placed on your tooth.
Brown and Grey Spots in the Affected Area
Brown and grey spot formations are a distinct visual indicator of a potential infection or tooth decay under a dental crown. Spots can be visible on the white portion of a veneer, almost appearing like mould.
Should Dental Amalgam Fillings Be Removed? If your filling is in good condition and your dentist or health care professional says there is no decay beneath the filling, removal of your amalgam filling is not recommended.
An Irritated Nerve
Sometimes the filling can come close to the nerve ending and cause some irritation. However, as the tooth heals, the throbbing pain and sensitivity will slowly go away.
In general, a filling takes an hour or less. A simple filling may take as few as 20 minutes. Many dental offices now have the technology to make onlays and inlays in one appointment, though a larger filling or multiple fillings can take longer.