D6602 Dental Code: Crown – Porcelain Fused to High Noble Metal
Dental procedures are categorized using standardized codes to ensure clarity in billing, insurance claims, and treatment documentation. One such code, D6602, refers to a crown restoration where porcelain is fused to a high noble metal alloy. This type of crown is widely used in restorative dentistry due to its durability, biocompatibility, and aesthetic appeal.
High noble metal crowns contain at least 60% noble metals (gold, platinum, palladium), with gold being the primary component. The porcelain overlay provides a natural tooth-like appearance, making this restoration suitable for both posterior and anterior teeth where strength and aesthetics are essential.
This article will explore the indications, procedure, benefits, drawbacks, cost factors, and comparisons with other crown types, providing a comprehensive guide for dental professionals and patients.
2. Understanding the Components: Porcelain Fused to High Noble Metal Crowns
High Noble Metal Alloy Composition
The metal substructure in a D6602 crown must meet the American Dental Association (ADA) criteria for high noble alloys:
| Metal Type | Minimum Percentage Required |
|---|---|
| Gold (Au) | 40% |
| Platinum (Pt) / Palladium (Pd) | 20% (combined) |
| Other Noble Metals | Balance |
This composition ensures corrosion resistance, strength, and biocompatibility, reducing the risk of allergic reactions.
Porcelain Overlay
The porcelain layer is baked onto the metal framework, providing:
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Aesthetic match to natural teeth
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Stain resistance compared to acrylic crowns
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Moderate wear compatibility with opposing teeth
3. Indications for D6602 Crowns
D6602 crowns are recommended for:
✔ Molars and premolars requiring high strength for chewing forces
✔ Anterior teeth where aesthetics are important but metal backing adds durability
✔ Patients with bruxism needing a durable restoration
✔ Cases requiring long-term stability (15-20+ years lifespan)
4. Contraindications and Limitations
✖ Allergy to metals (rare but possible with nickel-containing alloys)
✖ Patients wanting metal-free restorations (may prefer zirconia or all-ceramic)
✖ Excessive wear cases where monolithic zirconia may be better
5. Step-by-Step Procedure for Placing a D6602 Crown
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Tooth Preparation – Removal of decay and shaping the tooth.
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Impressions – Digital or traditional molds sent to the lab.
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Temporary Crown Placement – Protects the tooth while the permanent crown is fabricated.
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Metal Framework Try-In – Ensures proper fit before porcelain application.
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Porcelain Layering and Firing – Custom shading and baking for aesthetics.
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Final Cementation – Permanent adhesive bonding.
6. Advantages of Porcelain-Fused-to-High-Noble-Metal Crowns
✅ Superior longevity (often 20+ years)
✅ Excellent strength for posterior teeth
✅ Natural appearance with porcelain masking the metal underneath
✅ Biocompatibility (low risk of gum irritation)
7. Disadvantages and Potential Complications
❌ Higher cost than non-precious metal crowns
❌ Possible dark gum line due to metal substructure
❌ Porcelain chipping risk (though less common than with all-ceramic crowns)
8. Comparison with Other Crown Materials
| Crown Type | Strength | Aesthetics | Cost | Longevity |
|---|---|---|---|---|
| D6602 (Porcelain-Fused-to-High-Noble-Metal) | High | Good | $$$ | 15-25 years |
| Zirconia | Very High | Excellent | $$$$ | 10-15 years |
| All-Ceramic (E.max) | Moderate | Best | $$$$ | 10-15 years |
| PFM (Non-Precious Metal) | High | Fair | $$ | 10-20 years |
9. Cost and Insurance Considerations
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Average Cost: $1,000 – $1,500 per crown
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Insurance Coverage: Often covered at 50% (depending on plan)
10. Maintenance and Longevity
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Brush and floss regularly
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Avoid hard foods to prevent porcelain fractures
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Regular dental check-ups for adjustments
11. Case Studies and Clinical Outcomes
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Study 1: 90% success rate after 15 years (Journal of Prosthetic Dentistry)
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Study 2: Lower fracture rates compared to all-ceramic crowns
12. FAQs About D6602 Dental Code
Q1: Is a D6602 crown metal-free?
No, it contains a high noble metal base with porcelain overlay.
Q2: How long does a D6602 crown last?
Typically 15-25 years with proper care.
Q3: Can I get an MRI with a D6602 crown?
Yes, high noble metals are non-ferromagnetic.
13. Conclusion
The D6602 dental code represents a high-quality, long-lasting crown option combining strength and aesthetics. While more expensive than basic PFM crowns, its biocompatibility and durability make it a preferred choice for many patients. Discuss with your dentist to determine if it’s the right restoration for your needs.
14. Additional Resources
