Do I Really Need a Dental Crown for My Cavity? - Dentistry

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Hello Doctor,
Today I went for a dental check-up and the dentist found that one of my upper molars has a cavity in the interproximal space (this molar was filled with silver amalgam a few years ago).
Initially, the dentist mentioned that the cavity in the space between the teeth would be difficult to fill, but later during the treatment, they said the decay is close to the nerve and advised that it would be better to get a crown as soon as possible.
I was scheduled for an appointment tomorrow, but I feel rushed because just a few minutes earlier, the dentist said it could be filled.
Although this molar was filled with silver amalgam a few years ago (and the filling hasn’t fallen out), considering the newly discovered cavity that I don’t feel, does it really need a crown? Can’t it just be filled instead? Thank you for your help.

Kaili, 20~29 year old female. Ask Date: 2006/09/07

Dr. Chu Boqin reply Dentistry


Hello Kelly: Generally speaking, cavities can be filled on the occlusal surface.
However, cavities located on the interproximal surfaces between two teeth can also be treated with amalgam or resin fillings.
If the cavity extends from the occlusal surface to the interproximal surface and is too large, (1) it can certainly be repaired, or (2) placing a crown for protection is also a good alternative.
You should trust your dentist, or consider seeking a second opinion from another dentist you feel comfortable with.
Thank you for your question, and I wish you good dental health!

Reply Date: 2006/09/07

More Info


When it comes to dental health, particularly regarding cavities and the need for crowns, it's essential to understand the underlying reasons for your dentist's recommendations. In your case, the discovery of a cavity in your upper molar, especially one that is close to the nerve, raises several important considerations.

Firstly, let's discuss the nature of cavities. Cavities, or dental caries, occur when bacteria in the mouth produce acids that erode the tooth enamel. If left untreated, cavities can progress deeper into the tooth, potentially reaching the pulp, which contains nerves and blood vessels. When a cavity is near the nerve, it poses a risk of infection and severe pain, which can lead to more complicated treatments, such as root canals or even tooth extraction.

Your dentist initially suggested that the cavity could be filled, which is often the first line of treatment for minor cavities. However, upon further examination, they determined that the decay was more extensive than initially thought. This is a common scenario in dentistry; sometimes, the extent of decay is not fully visible until the tooth is examined more closely. When a cavity is close to the nerve, a filling may not provide adequate protection, and the tooth could be at risk of fracturing under pressure or developing further decay.

This brings us to the recommendation for a dental crown. A crown is a cap that covers the entire tooth, providing strength and protection. It is particularly beneficial for teeth that have undergone significant decay or have been previously treated with fillings. Crowns can help restore the tooth's shape, size, and function while also preventing further damage. In your case, since the cavity is close to the nerve, a crown would not only protect the tooth but also help to maintain its structural integrity, reducing the risk of future complications.

While it may feel abrupt to be told you need a crown after initially being informed that a filling might suffice, this change in recommendation is based on the dentist's professional assessment of the tooth's condition. It's crucial to trust your dentist's expertise, as they are trained to evaluate the health of your teeth and make recommendations that prioritize your long-term dental health.

If you are still uncertain about the necessity of a crown, it is perfectly reasonable to seek a second opinion from another dental professional. This can provide you with additional insights and help you feel more confident in your treatment decision. However, keep in mind that delaying treatment could lead to more severe issues down the line, including the potential need for more invasive procedures.

In summary, while fillings are a common treatment for cavities, the proximity of decay to the nerve in your case suggests that a crown would be the more prudent choice. It offers comprehensive protection and can help prevent further complications. Always feel empowered to discuss your concerns with your dentist and ask for clarification on any treatment recommendations. Your oral health is paramount, and understanding your treatment options is an essential part of maintaining it.

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