Small cavities are fixed with fillings. But when decay spreads too far — weakening large portions of the tooth — a filling simply cannot do the job. At that point, a dental crown becomes the most reliable and effective solution.
A crown covers the entire visible portion of the tooth, restoring its strength, shape, and function completely. If you are looking for a dentist in Sherwood Park that residents trust for restorative dental care, understanding how crowns work for large cavities helps you feel prepared and confident walking into your appointment.
What Makes a Cavity Too Large for a Filling?
Not every cavity needs a crown. But several situations make a crown the better—or only—choice.
A crown is typically recommended when:
- The cavity has destroyed more than half the tooth structure
- The tooth has cracked or fractured due to deep decay
- An existing large filling has broken down, and there is not enough healthy tooth left to support a new one
- Decay has reached the inner nerve of the tooth, and a root canal is needed
- The tooth is at high risk of breaking without full coverage and protection
When decay reaches this level, simply filling the space leaves the remaining tooth structure weak and vulnerable to further breakage. A crown wraps around the entire tooth and holds it together—like a protective shell.
Deep Cavity Treatment Options
When a cavity is deep, your dentist will assess exactly how far the decay has progressed before recommending the right treatment path.
Here is a simple overview of deep cavity treatment options based on severity:
| Severity of Decay | Recommended Treatment |
| Small to medium cavity | Standard composite or amalgam filling |
| Large cavity, cusps intact | Dental inlay or onlay |
| Large cavity, cusps damaged | Dental crown |
| Decay reaching the pulp | Root canal followed by a crown |
| Tooth too damaged to save | Extraction and replacement (implant or bridge) |
The goal is always to preserve as much natural tooth structure as possible while restoring full function and protection. A dental crown achieves both when the damage is significant.
Root Canal and Crown Treatment — When Both Are Needed
This combination comes up frequently, and it is important to understand why both steps are often necessary together.
When decay reaches the inner pulp of the tooth — the soft tissue containing nerves and blood vessels — it causes infection and significant pain. A root canal removes that infected pulp, cleans the canals inside the root, and seals the tooth.
But after a root canal, the tooth becomes more brittle. It no longer receives nutrients from the pulp and is more prone to cracking under chewing pressure. A crown placed over the treated tooth protects it and restores full function.
Root canal and crown treatment together give the tooth the best possible chance of lasting for many years. Skipping the crown after a root canal significantly increases the risk of the tooth fracturing—which often leads to extraction.
What Are Dental Crowns Made From?
Modern crowns come in several materials, each with its own strengths.
- Porcelain crowns — the most natural-looking option; ideal for front teeth where appearance matters most
- Porcelain-fused-to-metal crowns—strong and natural-looking—are a popular choice for both front and back teeth
- Zirconia crowns—extremely strong and tooth-coloured; excellent for back teeth that handle heavy chewing forces
- Gold crowns — the most durable option available; less popular due to appearance, but an outstanding long-term choice for back teeth
Your dentist will recommend the best material based on which tooth is being crowned, your bite, and your personal preferences.
The Step-by-Step Crown Placement Process
Getting dental crowns near you is a straightforward process that usually takes two appointments.
First Appointment — Preparation
- A local anesthetic is applied to numb the area completely
- Your dentist removes all decay from the tooth
- The tooth is shaped and resized to make room for the crown
- A precise impression or digital scan is taken and sent to a dental lab
- A temporary crown is placed to protect the tooth while your permanent crown is being made—usually one to two weeks
Second Appointment — Placement
- The temporary crown is removed
- The permanent crown is checked carefully for fit, shape, and colour
- Small adjustments are made if needed
- The crown is permanently cemented into place
- Your bite is checked, and the crown is polished smooth
Once placed, the crown feels and functions just like a natural tooth.
How Long Do Dental Crowns Last?
With the right care, a dental crown can last anywhere from 10 to 25 years — sometimes longer.
There are various factors that contribute to a crown’s lifespan. These are:
- What the crown is constructed from.
- Where in the mouth is it located
- Your oral hygiene habits
- Whether you grind your teeth at night
- How regularly do you visit your dentist for checkups
How to Take Care of Your Crown
Caring for a crown is simple—it requires the same good habits as caring for natural teeth.
- Brush twice daily with a soft toothbrush and fluoride toothpaste
- Floss carefully around the crown every day—pay attention to the gumline
- Avoid biting very hard objects like ice, hard candy, or pens
- Wear a nightguard if you grind or clench your teeth
- Rinse with an antibacterial mouthwash to keep the gum area healthy
- Attend regular dental checkups so your dentist can monitor the crown and the tooth beneath it
One extra tip — be gentle when flossing around a crown. Pull the floss out sideways rather than snapping it upward, which can dislodge the crown over time.
Signs Your Crown May Need Attention
A well-placed crown should not cause any ongoing problems. But contact your dentist if you notice:
- Pain or sensitivity when biting down
- The crown feels loose or shifts slightly
- A visible crack or chip in the crown
- Sensitivity to hot or cold that lingers
- Swelling or discomfort in the gum around the crown
- The crown has completely come off
Most of these issues are straightforward to address when caught early—which is another reason regular checkups matter so much.
Restore Your Tooth With Confidence — Aspire Dental Is Here to Help
Large cavities can feel overwhelming, but a dental crown is a proven, reliable solution that restores your tooth to full strength and function. With the right care, it can protect your tooth for many years to come.
The team at Aspire Dental wants to provide restorative treatment that is comprehensive, comfortable, and personalized to you. From large cavities to broken-down old fillings to a necessary root canal treatment that now needs a crown, they are eager to provide you with answers and support. Call today to book your appointment and achieve a healthier smile.
Frequently Asked Questions
Does getting a dental crown hurt?
The procedure is done under local anesthetic, so you should not feel pain during the appointment—some mild soreness and sensitivity for a few days afterward are normal and manageable.
Can a cavity come back under a crown?
Yes — decay can develop where the crown meets the gumline if oral hygiene is poor, which is why brushing and flossing around the crown every day is so important.
How do I know if I need a crown or just a filling?
Your dentist will assess the size and depth of the cavity—generally, if more than half the tooth structure is affected or the cusps are damaged, a crown provides better long-term protection than a filling.
Is a temporary crown the same as a permanent one?
No—temporary crowns are made from a softer material and are designed to protect the tooth for a short period only; the permanent crown is custom-made in a lab for a precise fit and long-term durability.