Can a Finished Dental Crown Be Reshaped Without Risk of Damage?

Q: Can a Finished Dental Crown Be Reshaped Without Risk of Damage?

Hello： Clinically, it is "essential" to have the patient bite down and adjust (grind) the dentures in their mouth. <br>If it is a metal crown, there are polishing wheels or sanders used after grinding. <br>For traditional porcelain, it can be sent back to the lab for an additiona

Denture polishing

Hello Dr.
Lin,
I recently had a crown made for a single molar (zirconia material), and during the try-in, I felt that it was particularly high.
The dentist attempted to adjust the crown on the spot using instruments, but I refused.
A few weeks later, we took a new bite impression and remade the crown.
The dentist mentioned that if it still doesn't fit well, they would still grind down the finished crown.

I would like to ask you, Dr.
Lin, is it acceptable to grind down a fired crown like this? Will there be a risk of fracture during future use? Thank you.

Longlong, 40~49 year old female. Ask Date: 2023/06/20

Dr. Lin Jiayong reply Dentistry

Hello: Clinically, it is "essential" to have the patient bite down and adjust (grind) the dentures in their mouth.
If it is a metal crown, there are polishing wheels or sanders used after grinding.
For traditional porcelain, it can be sent back to the lab for an additional layer of glaze after grinding.
In the case of zirconia, since it is already quite hard, there is no need to worry about porcelain cracking after grinding (unless the remaining ceramic thickness is less than 2mm).

Reply Date: 2023/06/20

More Info

When it comes to reshaping a finished dental crown, particularly one made from zirconia, there are several important considerations to keep in mind. Zirconia crowns are known for their strength and durability, making them a popular choice for dental restorations. However, the process of reshaping or adjusting these crowns can carry some risks if not done properly.

Firstly, it is indeed possible for a dentist to adjust a finished zirconia crown by grinding or polishing it. This is often done to ensure a proper fit and bite alignment. However, the dentist must be cautious during this process. Over-grinding can compromise the integrity of the crown, potentially leading to fractures or chips. Zirconia is a very hard material, and while it is resistant to wear, it can still be damaged if excessive force is applied during the adjustment.

If the crown feels too high or uncomfortable, it is essential to communicate this with your dentist. They should assess the occlusion (the way your teeth come together) and make necessary adjustments. It is generally advisable to avoid having the crown adjusted multiple times, as repeated grinding can weaken the structure. If the crown needs significant alteration, it may be more prudent to consider remaking it rather than continually adjusting the existing one.

In terms of the risk of fracture, while zirconia crowns are robust, they are not invincible. If a crown is excessively thinned or improperly adjusted, it may be more susceptible to breaking under pressure, especially during chewing. Additionally, if the crown is not seated properly after adjustments, it could lead to uneven forces being applied to it, increasing the risk of damage.

Moreover, it is crucial to ensure that the crown is properly bonded to the tooth. If the bond is compromised during the adjustment process, this could lead to further complications, such as the crown becoming loose or dislodged. Therefore, any adjustments should be performed by a skilled dentist who understands the properties of the materials involved and the mechanics of dental occlusion.

In conclusion, while it is possible to reshape a finished zirconia crown, it should be done with caution. If you have concerns about the height or fit of your crown, it is best to discuss these with your dentist. They can evaluate whether an adjustment is appropriate or if remaking the crown would be a better option. Always prioritize clear communication with your dental care provider to ensure that your restoration meets your functional and aesthetic needs without compromising its longevity or integrity.

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