When it comes to dental restorations, dental crowns are a popular choice for their durability and aesthetic appeal. However, just like any other dental treatment, dental crowns can crack over time. Understanding the reasons behind dental crown cracking can help you take preventive measures and ensure the longevity of your dental restorations. In this article, we will explore 10 reasons why dental crowns crack and discuss each aspect in detail.
1. Natural Wear and Tear
The average lifespan of a dental crown ranges from 5 to 15 years. Over time, natural wear and tear can cause cracks to develop in the crown. Chewing and biting forces, as well as regular tooth grinding or clenching, can contribute to the development of these cracks. Regular dental check-ups and proper oral hygiene can help identify and address any signs of wear and tear on your dental crowns.
Furthermore, the material of the dental crown plays a significant role in its durability. Porcelain-fused-to-metal (PFM) crowns, for example, can sometimes experience chipping or cracking of the outer porcelain layer due to the differences in hardness between the porcelain and metal components.
2. Insufficient Tooth Structure
Dental crowns require sufficient tooth structure for proper support. If a tooth has extensive decay, fractures, or is weakened due to root canal treatment, it may not have enough structure to hold the dental crown securely. In such cases, the crown may be more prone to cracking or dislodging. Dentists often recommend additional procedures, such as root canal therapy or dental implants, to strengthen the tooth before placing a dental crown.
3. Incorrect Bite Alignment
If your bite alignment is not properly adjusted after the placement of a dental crown, it can create excess forces on the crown when you chew or bite. These excessive forces can lead to cracks or even complete fracture of the crown. Dentists use occlusal adjustments to ensure that your dental crown fits perfectly with your natural bite, minimizing the risk of cracking due to misalignment.
4. Trauma or Injury
Accidents or injuries to the mouth can cause dental crowns to crack. Falls, sports-related injuries, or any direct impact to the mouth area can damage the crown. If you experience trauma or injury, it is essential to consult your dentist immediately for an examination to determine if the crown needs repair or replacement.
5. Teeth Grinding and Clenching
Bruxism, or teeth grinding and clenching, can exert excessive pressure on dental crowns, leading to cracks or fractures. This habit is often involuntary and can occur during sleep or throughout the day. If you have bruxism, your dentist may recommend a nightguard or splint to protect your crowns from the detrimental effects of grinding and clenching.
6. Poor Crown Design or Fit
The design and fit of the dental crown are crucial for its long-term success. If the crown is poorly designed or does not fit accurately, it can create stress points that may result in cracking. It is essential to choose a skilled and experienced dentist who uses high-quality materials and precisely fits the crown to your tooth.
7. Excessive Forcing During Cementation
During the cementation process, excessive forcing of the crown onto the prepared tooth can cause cracks. It is necessary to ensure a gentle and controlled application of force to avoid unnecessary stress on the crown. Dentists use adhesive cements specifically designed for dental restorations to minimize the risk of cracking during the cementation procedure.
8. Temperature Changes
Rapid temperature changes can cause dental crowns to expand or contract abruptly, leading to cracks. Drinking hot or cold beverages, exposure to extreme temperatures during food consumption, or even sudden temperature changes during professional teeth whitening procedures can affect the integrity of the crown. While high-quality dental crowns are designed to withstand normal temperature variations, extreme changes should be avoided to prevent cracking.
9. Poor Oral Hygiene
Poor oral hygiene can contribute to the degradation of dental crowns over time. Plaque and bacteria buildup around the gumline and the margins of the crown can weaken the tooth structure and potentially lead to cracks. Regular brushing, flossing, and professional dental cleanings are essential to maintain the longevity of your dental crowns.
10. Material Degradation
Over an extended period, the materials used for dental crowns can degrade, resulting in cracks. This degradation can occur due to factors such as exposure to acidic foods or beverages, inadequate oral hygiene, or poor manufacturing quality. High-quality dental crowns made from materials such as zirconia or porcelain are less prone to degradation and offer better longevity.
Frequently Asked Questions
1. How much does a dental crown cost?
The average cost of a dental crown ranges from $800 to $2,500 per tooth. The actual price may vary depending on several factors, including the location, the materials used, and the complexity of the procedure.
2. Can a cracked dental crown be repaired?
Whether a cracked dental crown can be repaired depends on the extent and location of the crack. In some cases, a minor crack can be repaired with dental bonding or sealants. However, more severe cracks may require complete replacement of the crown.
3. How long does it take to get a dental crown?
The process of getting a dental crown typically requires two visits to the dentist. During the first visit, the tooth is prepared, and an impression is taken. A temporary crown is then placed. In the second visit, the temporary crown is removed, and the permanent crown is cemented into place. The entire process usually takes two to three weeks.
