Why Fillings and Crowns Come Out
Fillings and crowns occasionally fail and come loose or fall out completely. Understanding common causes helps prevent future loss.
Filling loss occurs when: decay forms at the filling edge (secondary caries), filling material fractures, or the tooth structure around the filling fractures.
Crown loss occurs when: the cement bonding the crown to the tooth fails, tooth structure deteriorates beneath the crown, or the tooth fractures.
Both situations require professional replacement, though temporary solutions may be needed before the appointment.
Immediate Concerns with Lost Restoration
When a filling or crown is lost:
- The exposed tooth is sensitive to temperature and air
- The tooth is susceptible to new decay
- The tooth is more fragile and prone to fracture
- Bacteria can infiltrate, potentially causing infection
Prompt replacement is important—temporary measures buy time until permanent replacement.
Temporary Solutions for Lost Fillings
Temporary filling material: Over-the-counter kits (like Dentemp) contain temporary filling material. These can be self-applied to seal the exposed tooth surface temporarily. Instructions in the kit provide application guidance.
How to apply: Clean the tooth cavity, apply temporary material per instructions, and bite to set. The material hardens, sealing the opening. This protects the tooth until permanent filling can be placed.
Duration: Temporary fillings usually last 1-2 weeks. They're not durable—don't expect them to last like permanent fillings.
Limitations: Temporary materials don't restore tooth anatomy or appearance. They protect but don't restore function.
Temporary Solutions for Lost Crowns
Temporary crown replacement: The original crown can sometimes be re-cemented. Call your dentist immediately—if the crown is kept clean, it can often be re-cemented the same day or next day.
Storage: If the crown is lost, it cannot be replaced. If you've kept it, bring it to your appointment.
How to temporarily protect: If the crown cannot be immediately re-cemented:
- Temporary filling material can seal the prepared tooth
- Topical anesthetics reduce sensitivity
- Soft diet prevents fracture
- Over-the-counter temporary crown material (like DuoTemp) can be self-applied
Self-applied temporary crown: Some kits allow creation of a temporary crown at home. These provide basic protection but are less durable than professional temporary restorations.
Management While Awaiting Professional Treatment
Pain management: Sensitivity to temperature is common. Avoid very hot or cold foods. Topical anesthetics provide temporary numbness.
Soft diet: Avoid chewing on the exposed tooth. Eat soft foods to prevent fracture or pain.
Hygiene: Keep the area clean by gentle brushing. Avoid aggressive flossing in the area.
Avoid sticky foods: Sticky foods can displace temporary restorations.
Professional Evaluation and Replacement
Schedule an appointment immediately. Your dentist assesses:
- Extent of tooth damage beneath the restoration
- Cause of restoration loss
- Whether the original crown is salvageable
Permanent Filling Replacement
Direct composite filling: The dentist removes remaining filling material and any decay, then places new composite filling. This appointment is typically 30-60 minutes.
Insurance: Most plans cover filling replacement.
Durability: Modern composite fillings last 7-10 years typically. Longevity depends on filling size and location.
Permanent Crown Replacement
Is the crown salvageable?: If the original crown is intact, your dentist assesses whether it can be re-used. If the tooth is not fractured and cement failure is the only problem, re-cementation may be possible.
Laboratory fabrication: If a new crown is necessary, impressions are taken and a laboratory fabricates a new crown. This typically requires 1-2 weeks and multiple appointments (impression appointment and insertion appointment).
Temporary crown: During the 1-2 week wait for the permanent crown, a temporary crown protects the prepared tooth. Temporary crowns are made of acrylic and are less durable than final crowns.
Final appointment: The permanent crown is tried in and cemented. Bite adjustments ensure proper contact.
Cost Considerations
Temporary solutions: Over-the-counter temporary materials cost $5-15. Professional temporary restorations cost more but offer better protection.
Permanent solutions: Filling replacement costs $150-$300. Crown replacement costs $1,000-$2,500 depending on material.
Insurance: Most plans cover both filling and crown replacement at reasonable percentages.
Prevention of Future Loss
Maintain regular appointments: Problems are detected early before catastrophic failure.
Good oral hygiene: Brushing and flossing prevent decay at restoration edges.
Avoid chewing on hard objects: Don't chew on ice, nuts, or hard candy.
Address grinding: If you grind teeth, wear a protective nighttime mouthguard.
Regular maintenance: Crowns and fillings eventually wear and require replacement. This is normal.
When Loss Indicates Larger Problems
Multiple fillings or crowns failing suggests:
- Uncontrolled grinding or clenching
- Poor oral hygiene allowing decay
- Underlying tooth structure problems
Your dentist addresses root causes to prevent continued failure.
Emergency Scenarios
If the lost restoration causes severe pain or swelling, or if a temporary crown falls off and you can't reach your dentist immediately:
- Apply topical anesthetics
- Use temporary filling material
- Call your dentist for emergency advice
- Avoid very hot, cold, hard, or sticky foods
Most lost fillings and crowns are successfully replaced. Prompt professional treatment ensures teeth are protected and restored to function.