D.856L.014.FGXL long shank (25mm)
Pack size: 5
Price per item: £4.25(ex. VAT) £5.10(inc. VAT)
Additional information
| Head Length | 11.5 |
|---|---|
| Total length | 25 |
| Shaft type | 316 |
| Diameter | 014 |
| Shaft | FGXL |
| Max Revolutions | max. 225.000 |
| Procedure | Crown preparation |
| Material | Diamond |
| Shape | Tapered Chamfer Round End |
| Colour Ring | Blue |
| Grit | N/A |
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Diamond drill cone round
Frank Dental D.856L Tapered Chamfer Round End Crown Preparation Bur 1.4mm at the widest part (Where the diamond meets the shank) 0,9mm at the narrowest part (Tip/head).
Frank Dental D.856L Premium German Diamond Bur for Zirconia Crowns, Full Gold Crowns, Metal Crowns and Conservative Crown Preparations
Precision Crown Preparation with the Frank Dental D.856L Tapered Chamfer Diamond Bur
The Frank Dental D.856L Tapered Chamfer Round End Diamond Bur is a premium German-manufactured crown preparation bur specifically designed to create precise chamfer margins for full coverage crown restorations. Featuring a tapered profile, rounded end geometry and highly efficient natural diamond coating, the D.856L enables clinicians to produce smooth, accurate and predictable crown preparations while preserving healthy tooth structure.
The Frank Dental D.856L is one of the most widely used crown preparation burs in modern restorative dentistry because the chamfer margin it creates is suitable for many of today’s most popular restorative materials, including monolithic zirconia crowns, full gold crowns, cast metal crowns, posterior lithium disilicate restorations and CAD/CAM fabricated restorations.
For dentists searching for a crown preparation bur, tapered chamfer diamond bur, zirconia crown preparation bur, heavy chamfer bur, gold crown preparation bur, crown margin bur, prosthodontic diamond bur, crown and bridge preparation bur or German dental burs, the Frank Dental D.856L provides exceptional cutting efficiency, excellent visibility and predictable preparation geometry.
What is the Frank Dental D.856L?
The Frank Dental D.856L is a tapered chamfer round end diamond bur designed to create a smooth chamfer finish line around a prepared tooth.
The bur features:
- Tapered body design
- Rounded working end
- Chamfer-producing geometry
- Parallel cutting surfaces
- Premium natural diamond coating
- Long neck design for enhanced access and visibility
Unlike shoulder burs such as the Frank Dental D.847 or D.848, which create a flat 90-degree shoulder margin, the D.856L produces a rounded chamfer finish line that creates a smooth transition between the prepared tooth and the restoration.
This preparation design is often preferred because it provides excellent support for modern restorative materials while conserving more healthy tooth structure.
What Makes the D.856L Different from the D.850L?
Although both burs create chamfer margins, the Frank Dental D.856L features a slimmer, more elegant profile and longer working length.
This makes it particularly useful for:
- Deep chamfer preparations
- Anterior crown preparations
- Subgingival margin placement
- Aesthetic restorative procedures
- Crown and bridge preparations requiring improved visibility
The D.856L allows clinicians to create highly refined chamfer margins while maintaining excellent control throughout the preparation.
What is a Chamfer Margin?
A chamfer margin is a curved finish line that creates a rounded internal angle between the axial wall and the margin of the preparation.
The chamfer preparation remains one of the most popular crown preparation designs because it offers:
- Conservative tooth reduction
- Excellent restoration support
- Smooth stress distribution
- Predictable crown seating
- Easy impression taking
- Clear digital scan margins
The rounded profile helps minimise stress concentration within ceramic restorations while preserving healthy tooth structure.
Why Use a Round End Chamfer Bur?
The rounded end of the Frank Dental D.856L automatically creates smooth internal line angles during tooth preparation.
This is clinically important because sharp internal angles can create areas of stress concentration within ceramic restorations.
Stress concentrations may increase the risk of:
- Ceramic fracture
- Crown chipping
- Restoration failure
- Crack propagation
The smooth chamfer produced by the D.856L helps distribute functional forces more evenly throughout the restoration.
This contributes to stronger and more durable restorations.
Why the D.856L is Ideal for Monolithic Zirconia Crowns
One of the most common applications of the Frank Dental D.856L is preparing teeth for monolithic zirconia restorations.
Modern zirconia materials offer:
- High flexural strength
- Excellent fracture resistance
- Outstanding durability
- Reduced chipping risk
Unlike traditional PFM crowns, zirconia crowns do not require large amounts of porcelain at the margin.
As a result, most zirconia manufacturers recommend a chamfer finish line rather than a shoulder preparation.
The chamfer created by the D.856L provides:
- Adequate zirconia thickness
- Excellent marginal integrity
- Conservative tooth reduction
- Predictable crown fit
This makes the D.856L one of the most useful burs for zirconia crown preparations.
Why Use the D.856L for Full Gold Crowns?
Many experienced restorative dentists still regard cast gold restorations as the benchmark for longevity and marginal adaptation.
Gold possesses unique properties:
- Exceptional strength
- Excellent ductility
- Outstanding marginal accuracy
- Ability to function at thin dimensions
Unlike ceramic restorations, gold does not require large volumes of material at the margin.
The chamfer margin produced by the D.856L provides the ideal preparation design for:
- Full gold crowns
- Cast gold onlays
- Precious metal crowns
- Cast metal restorations
The preparation preserves healthy tooth structure while providing excellent support for the restoration.
Why Use a Chamfer Margin Instead of a Shoulder?
The choice of finish line depends largely on the restorative material being used.
A shoulder margin is typically reserved for restorations that require significant porcelain thickness, such as:
- Porcelain fused to metal crowns
- Porcelain butt margin crowns
- Highly aesthetic layered ceramic crowns
A chamfer margin is generally preferred for:
- Monolithic zirconia crowns
- Full gold crowns
- Cast metal crowns
- Posterior ceramic restorations
- Conservative crown preparations
The D.856L allows clinicians to create these conservative preparations efficiently and accurately.
Ideal for Posterior Lithium Disilicate Crowns
The Frank Dental D.856L is frequently used for posterior lithium disilicate restorations.
The smooth rounded internal geometry helps:
- Reduce stress concentration
- Improve ceramic strength
- Enhance crown seating
- Improve restoration longevity
Many clinicians prefer a deep chamfer preparation for posterior E.max crowns because it provides sufficient material thickness without excessive tooth reduction.
Advantages of the Long Neck Design
One of the most appreciated features of the Frank Dental D.856L is its elongated working neck.
Benefits include:
Improved Visibility
The longer neck improves access to preparation margins and enhances visual control.
Better Access Interproximally
Particularly useful during crown preparations in difficult posterior areas.
Easier Subgingival Margin Placement
Allows clinicians to refine margins without obstructing their view.
Improved Precision
Greater visibility often leads to more accurate finish line creation.
Benefits for Digital Dentistry
The chamfer margin created by the Frank Dental D.856L is highly compatible with modern digital workflows.
The preparation can be accurately scanned using:
- Trios
- iTero
- PrimeScan
- Medit
- CEREC
The clearly defined margin improves:
- Digital impression accuracy
- Margin detection
- CAD design
- Restoration fit
This helps reduce chairside adjustments and remakes.
Premium Frank Dental Natural Diamond Technology
Frank Dental burs are manufactured using premium natural diamond technology developed for maximum clinical performance.
Benefits include:
Fast Cutting Efficiency
Rapid enamel and dentine reduction with excellent control.
Superior Diamond Retention
Long-lasting cutting performance.
Reduced Vibration
Improved clinician comfort and patient experience.
Consistent Performance
Uniform diamond distribution ensures predictable preparation geometry.
German Engineering
Precision manufacturing for exceptional reliability.
Common Clinical Applications
The Frank Dental D.856L is ideally suited for:
- Zirconia crown preparations
- Monolithic zirconia crowns
- Full gold crowns
- Cast metal crowns
- Posterior lithium disilicate crowns
- Crown and bridge preparations
- Implant-supported restorations
- CAD/CAM restorative workflows
- Conservative crown preparations
- Prosthodontic procedures
Conclusion
The Frank Dental D.856L Tapered Chamfer Round End Crown Preparation Bur is a versatile and highly precise crown preparation instrument designed for modern restorative dentistry. Its tapered profile, rounded end and long neck geometry create smooth chamfer margins ideally suited for monolithic zirconia crowns, full gold crowns, cast metal restorations and posterior lithium disilicate restorations.
By preserving healthy tooth structure while providing excellent support for restorative materials, the D.856L helps clinicians achieve predictable, long-lasting restorative outcomes. Combined with Frank Dental’s premium natural diamond technology and German manufacturing precision, it remains an essential bur for crown and bridge dentistry.
