A permanent crown. It’s more than just a cap for your tooth; it’s a restoration, a protector, and often a confidence booster. If you’ve been told you need a dental crown, understanding the ins and outs of the procedure, the different types available, and the long-term care is crucial for making informed decisions about your oral health. This guide will walk you through everything you need to know about permanent crowns, from preparation to aftercare.
What is a Permanent Crown?
Definition and Purpose
A permanent crown is a tooth-shaped cover that is cemented over a damaged or weakened tooth. It completely encases the visible portion of the tooth above the gum line. The primary purpose of a crown is to:
- Restore a tooth’s shape and size: When a tooth is cracked, broken, or significantly decayed, a crown restores its original form.
- Strengthen a tooth: Crowns provide structural support to weakened teeth, preventing further damage or breakage.
- Improve appearance: Crowns can correct discoloration, misshapen teeth, or other aesthetic imperfections.
- Protect a tooth after a root canal: Following a root canal, a tooth becomes more brittle. A crown protects it from fracture.
Think of a crown like a helmet for your tooth, shielding it from the daily grind of chewing and biting.
When is a Crown Necessary?
Several situations may necessitate a permanent crown:
- Extensive Decay: When decay is too large to be filled with a standard filling.
- Cracked or Broken Teeth: To prevent the crack from worsening or to hold a broken tooth together.
- After Root Canal Therapy: As mentioned earlier, a crown protects the weakened tooth.
- Cosmetic Reasons: To cover severely discolored or misshapen teeth.
- To support a dental bridge: Crowns act as anchors for a bridge, holding the artificial tooth (pontic) in place.
For example, imagine you have a large filling that’s been in place for many years. The tooth around the filling may have weakened, and the dentist might recommend a crown to provide additional support and prevent the tooth from fracturing.
Types of Permanent Crowns
Porcelain Crowns
Porcelain crowns are a popular choice because they closely resemble the natural color and translucency of teeth, making them virtually indistinguishable from your other teeth.
- Pros: Excellent aesthetics, biocompatible (less likely to cause allergic reactions), suitable for people with metal allergies.
- Cons: Can be more prone to chipping or cracking compared to metal crowns, may wear down opposing teeth slightly faster than metal.
- Example: Ideal for front teeth where aesthetics are a primary concern.
Porcelain Fused to Metal (PFM) Crowns
PFM crowns consist of a metal base covered with a layer of porcelain. They offer a balance of strength and aesthetics.
- Pros: Stronger than all-porcelain crowns, good aesthetics, less expensive than all-porcelain crowns.
- Cons: The metal base can sometimes be visible as a dark line at the gumline, porcelain can chip or fracture.
- Example: A good choice for molars where strength and aesthetics are both important.
Gold Alloy Crowns
Gold alloy crowns are made from a combination of gold, copper, and other metals. They are highly durable and biocompatible.
- Pros: Exceptional strength and durability, biocompatible, gentle on opposing teeth.
- Cons: Color is not natural-looking, more expensive than other options.
- Example: Often used for back molars where strength is paramount and aesthetics are less of a concern.
Zirconia Crowns
Zirconia crowns are made from a very strong ceramic material. They offer excellent aesthetics and durability.
- Pros: Highly durable, excellent aesthetics, biocompatible.
- Cons: Can be more abrasive to opposing teeth than porcelain.
- Example: Suitable for both front and back teeth where both strength and aesthetics are desired.
The Permanent Crown Procedure
Consultation and Preparation
The process begins with a consultation with your dentist. They will examine your tooth, take X-rays, and determine if a crown is the best treatment option. If so, the preparation involves:
- Shaping the tooth: The dentist will remove a portion of the tooth enamel to create space for the crown.
- Taking an impression: An impression of your tooth will be taken to create a model for the crown. This can be done physically with a putty-like material or digitally with a scanner.
- Selecting a shade: The dentist will match the color of the crown to your natural teeth.
- Temporary Crown: A temporary crown will be placed to protect the prepared tooth while the permanent crown is being fabricated in a dental lab.
For instance, if you’re getting a crown on a molar, the dentist will need to remove enough tooth structure to allow for the crown to fit properly without interfering with your bite.
Placement of the Permanent Crown
Once the permanent crown is ready (typically in 1-2 weeks), you’ll return to the dentist for its placement:
- Removal of the temporary crown: The temporary crown is carefully removed.
- Fitting the permanent crown: The dentist will check the fit and color of the permanent crown, making any necessary adjustments.
- Cementing the crown: Once the fit is satisfactory, the crown is permanently cemented onto the prepared tooth using a special dental adhesive.
- Bite adjustment: The dentist will check your bite to ensure the crown doesn’t interfere with your natural bite and make any final adjustments.
It’s important that the crown fits precisely. If it’s too high, it can put extra stress on the jaw joint. If it’s too low, it can cause food impaction and potential decay.
Caring for Your Permanent Crown
Oral Hygiene Practices
Proper oral hygiene is crucial for maintaining the health of your crown and the surrounding teeth:
- Brush twice daily: Use a soft-bristled toothbrush and fluoride toothpaste.
- Floss daily: Floss around the crown to remove plaque and food particles. Consider using a floss threader if you find it difficult to floss between your teeth.
- Use an antimicrobial mouthwash: Rinse with a mouthwash to kill bacteria and freshen breath.
Dietary Considerations
While crowns are strong, it’s still important to be mindful of your diet:
- Avoid hard or sticky foods: These can potentially damage or dislodge the crown. Examples include hard candies, nuts, ice, and chewy caramels.
- Limit sugary foods and drinks: Sugar contributes to tooth decay, which can affect the tooth supporting the crown.
- Be cautious with hot and cold foods: Some people experience sensitivity to temperature changes after getting a crown.
Regular Dental Check-ups
Regular dental check-ups are essential for monitoring the health of your crown and your overall oral health. Your dentist can:
- Examine the crown: Check for any signs of wear, damage, or looseness.
- Assess the surrounding gums: Look for signs of inflammation or infection.
- Provide professional cleaning: Remove plaque and tartar buildup.
It’s generally recommended to visit your dentist for a check-up and cleaning every six months. This allows for early detection and treatment of any potential problems.
Potential Problems and Solutions
Sensitivity
It’s common to experience some sensitivity to hot or cold temperatures after getting a crown. This usually subsides within a few weeks. If the sensitivity persists:
- Use toothpaste for sensitive teeth: These toothpastes contain ingredients that help block pain signals.
- Avoid very hot or cold foods and drinks: Give your tooth time to adjust.
- Consult your dentist: If the sensitivity is severe or doesn’t improve, your dentist can evaluate the crown and surrounding tooth for any underlying issues.
Chipping or Cracking
While crowns are durable, they can sometimes chip or crack, especially porcelain crowns. If this happens:
- Contact your dentist immediately: They can assess the damage and determine the best course of action.
- Avoid chewing on the affected side: This will help prevent further damage.
- Depending on the severity, the crown may need to be repaired or replaced.
Crown Loosening or Falling Out
A crown can become loose or fall out due to decay, improper fit, or trauma. If this occurs:
- Contact your dentist immediately: It’s important to have the crown re-cemented or replaced as soon as possible to protect the underlying tooth.
- Keep the crown: If you have the crown, bring it with you to the dentist.
- If the tooth is sensitive, you can use over-the-counter pain medication.
Conclusion
A permanent crown is a valuable investment in your oral health. By understanding the different types of crowns, the procedure involved, and proper aftercare, you can ensure the longevity and success of your restoration. Remember to maintain good oral hygiene, be mindful of your diet, and schedule regular dental check-ups to keep your crown and your smile healthy for years to come. If you have any concerns or questions, don’t hesitate to reach out to your dentist.
