Immediate Dentin Sealing (IDS): Step-by-Step Clinical Protocol for Stronger Adhesion

The Concept of the Biobase

At the core of Immediate Dentin Sealing (IDS) is the formation of a Biobase—a biomimetic foundation that ensures optimal adhesion and long-term restoration success.

The Biobase consists of three essential layers:

• Hybrid layer → formed by resin infiltration into demineralized dentin, creating a micromechanical bond

• Adhesive layer → acts as an interface that stabilizes the hybrid layer and enhances bond durability

• 0.5 mm flowable composite layer (Resin Coating – RC) → serves as an elastic buffer that absorbs stress, protects the hybrid layer, and improves sealing

Together, these layers function as a biomimetic substitute for the dentin-enamel junction (DEJ), providing both mechanical strength and biological protection to the pulp-dentin complex.

• ~90% of bond strength develops within 5 minutes

Immediate Dentin Sealing (IDS): Step-by-Step Clinical Protocol for Predictable Adhesion

Clinical Transition: From Theory to Execution

After understanding the biological and mechanical superiority of IDS, the real challenge lies in precise clinical execution.
IDS is a technique-sensitive protocol—success depends on respecting material science, timing, and substrate behavior.

1. Case Selection & Preparation Design

When IDS is Indicated

• Indirect restorations (inlays, onlays, overlays, crowns, veneers)
• Deep dentin exposure
• Cases with compromised retention form
• Endodontically treated teeth

When to Avoid IDS

• Very superficial dentin exposure
• Limited occlusal space (risk of thickness interference)

Preparation Guidelines

• Smooth, well-defined margins
• Chamfer: 0.7–0.8 mm (critical for proper material thickness)
• Avoid sharp internal angles

💡 Why it matters: Proper geometry prevents adhesive pooling and ensures optimal stress distribution.

2. Isolation: The Non-Negotiable Step

• Use rubber dam isolation (mandatory)
• Ensure complete moisture control

💡 Contamination at this stage = permanent bond compromise

read our guide about  Rubber Dam Isolation Mastery: A Clinical Guide

3. Substrate Identification (Smart Trick)

Perform short pre-etch (2–3 sec) with phosphoric acid:

• Enamel → frosty
• Dentin → glossy

👉 This helps visualize:

• Bondable enamel
• Exposed dentin areas needing IDS

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4. Dentin Cleaning & Refreshing

Removal of smear layer using air abrasion (sandblasting). Alternatively, 37% phosphoric acid can be applied for 3–5 seconds before Immediate Dentin Sealing (IDS).

• Remove smear layer and contaminants
• Use diamond or carbide bur to expose fresh dentin

Optional:

• 2% chlorhexidine → inhibits MMPs (collagen degradation)

⚠️ Avoid:

• Overdrying dentin
• Leaving contaminated surface

5. Etching Protocol (If Using Etch-and-Rinse)

• Enamel: 15–20 seconds
• Dentin: 10–15 seconds
• Rinse thoroughly
  
  
  
• Keep dentin slightly moist (wet bonding)

6. Adhesive Selection (Critical Decision)

Gold Standard Options

• 3-step etch-and-rinse (e.g., Optibond FL) → highest stability
• 2-step self-etch (e.g., Clearfil SE Bond) → lower sensitivity

💡 Avoid overly simplified adhesives:

• More hydrophilic
• Lower long-term durability

7. Adhesive Application Technique

• Apply adhesive actively (scrubbing motion)
  
  
  
• Air-thin gently (evaporate solvent)
  
  
  
• Avoid strong air stream → prevents pooling

💡 Pro Tip: Use a microbrush to wick excess adhesive instead of aggressive air.

8. Respect “Decoupling With Time (DWT)”

After curing adhesive:

⏳ Wait ~5 minutes

During this time:

• Bond reaches ~90% strength
• No stress should be applied

👉 Use this window to:

• Place matrices
• Perform deep margin elevation (DME)
• Plan next steps

9. Resin Coating (RC): The Game-Changer Layer

• Apply 0.5 mm flowable composite
  
  
  
• Light cure properly
  
  
  

Functions of RC Layer

• Stress absorption
• Reinforces hybrid layer
• Prevents fluid transudation
• Protects against Oxygen-Inhibition Layer (OIL)

💡 This layer = elastic buffer

10. Oxygen-Inhibition Layer (OIL) Management

• Apply glycerin gel (air-block)
• Light cure again (≈20 sec)

👉 Prevents:

• Unpolymerized surface
• Impression problems
• Weak bonding interface

11. Impression / Digital Scanning

For Conventional Impressions

• Use PVS only
• ❌ Avoid polyether (chemical interaction → tearing)

Surface Cleaning

• Pumice or Marseille soap → removes residues
• Ensures accurate impression

Digital Scanning

• Usually no pumicing needed

read our guide Digital vs. Conventional Dental Impressions: Complete Clinical Comparison

12. Temporization (Critical Stage)

Key Rules

• Use non-eugenol temporary cement
• Apply separating medium (petroleum jelly)

Reverse Spot Bonding Technique

• Bond small central spot only
• Prevents full adhesion of provisional

⚠️ Avoid:

• Eugenol → inhibits resin polymerization

13. Surface Reactivation Before Cementation

IDS surface becomes chemically inactive over time
→ needs reactivation

Protocol

• Air abrasion:

• 2–3.5 bar
• 5 seconds
• 30–50 µm particles

👉 Benefits:

• Removes contamination layer
• Increases surface area
• Improves micromechanical retention

14. Final Cementation Protocol

1. Etch enamel margins only
2. Do NOT re-etch dentin
3. Apply fresh adhesive layer
4. Cement restoration with resin cement

15. Materials & Armamentarium (Recommended)

Adhesives

• Optibond FL
• Clearfil SE Bond / Protect

Resin Coating

• Microfilled flowable composite

Cleaning

• 37% phosphoric acid
• Pumice / Marseille soap
• Glycerin gel

Reactivation

• Air abrasion unit
• Aluminum oxide particles

16. Clinical Tips That Make a Big Difference

• ✔️ Measure RC thickness (~0.5 mm) with probe
• ✔️ Keep dentin moist—not dry
• ✔️ Avoid adhesive pooling at margins
• ✔️ Respect 5-minute DWT window
• ✔️ Ensure full OIL elimination

17. Common Mistakes & How to Avoid Them

Clinical Takeaway

A successful IDS protocol is not just about applying adhesive—it’s about:

• Timing
• Layer control
• Material selection
• Stress management

When executed correctly, IDS creates a stable, stress-resistant Biobase that dramatically improves long-term outcomes.

Immediate Dentin Sealing (IDS): Evidence, Advantages, Limitations & Clinical Recommendations

From Concept to Standard of Care

Immediate Dentin Sealing (IDS) has evolved from a theoretical concept in adhesive dentistry to a clinical standard of care in indirect restorations.

Since its popularization by Pascal Magne (2005), IDS has been integrated into biomimetic dentistry principles, particularly within approaches that prioritize early hybridization and pulp protection.

The key shift is simple but powerful:

Dentin bonding is no longer a final step—it is the first critical step after preparation.

1. Scientific Evidence Supporting IDS

1.1 Bond Strength Improvement (IDS vs DDB)

One of the strongest arguments for IDS is its ability to maximize bond strength by respecting the Hierarchy of Bondability (HOB).

Potential Bond Strengths

Key Findings

• IDS can increase bond strength by up to 400% compared to DDB
• Dentin bond reaches ~90% strength within 5 minutes (Lu et al.)
• IDS allows maturation before exposure to stress

👉 In contrast, DDB:

• Subjects immature bonds to polymerization stress
• Leads to early bond failure

1.2 Microleakage & Marginal Integrity

Studies using Optical Coherence Tomography (OCT) have demonstrated:

• Presence of “white line” gaps in DDB
• Caused by:
• Faster enamel bonding
• Slower dentin bond maturation

👉 Result:

• Composite is pulled away from dentin
• Marginal gaps form

IDS Advantage

• Eliminates this mismatch through Decoupling With Time (DWT)
• Ensures a stable, matured interface before loading

1.3 Postoperative Sensitivity

Clinical studies consistently show:

• Significant reduction in sensitivity with IDS
• Near elimination in many cases

Why?

• Immediate sealing of dentinal tubules
• Prevention of fluid movement
• Reduced bacterial penetration

1.4 Long-Term Clinical Outcomes

• IDS improves restoration longevity
• Reduces failure rates in high-stress restorations

Key Insight

For ceramic veneers with >50% dentin exposure:
👉 IDS is considered mandatory

Without IDS:

• Failure rates increase significantly

2. Strategic Advantages of IDS

2.1 Maximum Adhesion Potential

• Allows dentin to reach its full bonding capacity (~50 MPa)
• Creates a bond approaching natural DEJ strength

2.2 Stress Management (DWT Concept)

• Separates bond formation from shrinkage stress
• Prevents gap formation
• Ensures cohesive bonding

2.3 Resin Coating (RC) Benefits

The 0.5 mm flowable composite layer provides:

• Stress absorption
• Protection of hybrid layer
• Improved polymerization
• Barrier against fluid transudation

2.4 Biological Protection

IDS acts as a:

• Bacterial barrier
• Chemical barrier
• Thermal barrier

👉 Result:

• Healthier pulp
• Reduced complications

3. Limitations and Clinical Challenges

Despite its advantages, IDS is highly technique-sensitive.

3.1 Oxygen-Inhibition Layer (OIL)

• Thickness: 10–40 µm
• Contains unpolymerized resin

Problems

• Interferes with impressions
• Affects bonding

Solution

• Glycerin gel curing
• Pumice cleaning

3.2 Contamination Risks

IDS surface can be compromised by:

• Saliva
• Blood
• Temporary materials

Critical Errors

• Using polyether impressions → adhesion & tearing
• Using eugenol cements → polymerization inhibition

3.3 Technique Sensitivity

Small errors can lead to:

• Bond failure
• Marginal gaps
• Sensitivity

4. Contemporary Controversies in IDS

4.1 Adhesive Systems: 3-Step vs Universal

3-Step Etch-and-Rinse

• More hydrophobic
• Higher long-term stability
• Gold standard

Universal Adhesives

• Easier to use
• More hydrophilic
• Potential long-term degradation

👉 Clinical trend:
3-step systems still outperform simplified systems

4.2 Is Resin Coating Always Necessary?

Debate exists, but evidence suggests:

• Thin adhesive layers are vulnerable
• RC layer:

• Enhances durability
• Improves stress distribution

👉 Conclusion:
RC is strongly recommended

4.3 Surface Reactivation: Required or Not?

Problem:

• Free radicals disappear after ~2–3 days

Solution

• Air abrasion (APA)

Benefits:

• Removes contaminated layer
• Increases surface energy
• Improves bonding

👉 Verdict:
Reactivation is essential for predictable results

5. Evidence-Based Clinical Recommendations

To achieve predictable IDS outcomes:

Non-Negotiable Principles

• ✔️ Use rubber dam isolation
• ✔️ Select gold-standard adhesives
• ✔️ Maintain Biobase thickness
• ✔️ Apply 0.5 mm resin coating
• ✔️ Respect 5-minute DWT

Technical Essentials

• ✔️ Chamfer margin: 0.7–0.8 mm
• ✔️ Initial bonded layers ≤ 1.5 mm (Alleman-Deliperi rule)
• ✔️ Avoid eugenol
• ✔️ Use PVS only for impressions
• ✔️ Perform air abrasion before cementation

6. IDS vs DDB: Final Clinical Comparison

7. Future Directions in Adhesive Dentistry

The future of IDS focuses on:

1. Hybrid Layer Stabilization

• Use of cross-linking agents (e.g., proanthocyanidins)
• Protection against enzymatic degradation

2. Advanced Biomimetic Materials

• Stronger, more elastic adhesives
• Improved stress distribution

3. Digital Dentistry Integration

• IDS combined with CAD/CAM workflows
• Immediate sealing before digital scanning

Final Conclusion: IDS as a Clinical Standard

Immediate Dentin Sealing is no longer an optional technique—it is a clinical necessity for achieving predictable outcomes in indirect restorations.

By implementing IDS, clinicians can:

• Maximize bond strength
• Eliminate postoperative sensitivity
• Protect the pulp-dentin complex
• Improve long-term restoration success

Frequently Asked Questions (FAQ) About Immediate Dentin Sealing (IDS)

What is Immediate Dentin Sealing (IDS)?

Immediate Dentin Sealing (IDS) is the technique of applying a dentin bonding agent immediately after tooth preparation, before impression taking, to seal freshly cut dentin and improve bond strength.

Why is Immediate Dentin Sealing important?

IDS is important because it prevents dentin contamination, reduces postoperative sensitivity, and significantly increases bond strength compared to delayed dentin bonding.

How does IDS improve bond strength?

IDS allows the adhesive interface to mature in a stress-free environment before being exposed to polymerization shrinkage during final cementation, resulting in stronger and more stable bonding.

What is the difference between IDS and DDB?

IDS involves sealing dentin immediately after preparation, while Delayed Dentin Bonding (DDB) seals dentin during final cementation. IDS provides better bond strength, less sensitivity, and improved marginal integrity.

When should Immediate Dentin Sealing be used?

IDS is recommended in indirect restorations such as inlays, onlays, crowns, and veneers—especially when there is significant dentin exposure.

Is IDS mandatory for veneers?

IDS is strongly recommended for veneers when dentin exposure exceeds 50%, as it improves bonding reliability and reduces failure rates.

What adhesive systems are best for IDS?

Gold-standard systems include 3-step etch-and-rinse adhesives (e.g., Optibond FL) and 2-step self-etch systems (e.g., Clearfil SE Bond), as they provide better durability and bond strength.

Is a flowable composite layer necessary in IDS?

Yes, applying a 0.5 mm flowable composite layer (resin coating) is recommended because it improves stress distribution, protects the hybrid layer, and enhances long-term bond stability.

How do you manage the oxygen-inhibition layer (OIL)?

The oxygen-inhibition layer is managed by applying glycerin gel and light curing again, followed by surface cleaning (e.g., pumice) before impression taking.

Can IDS reduce postoperative sensitivity?

Yes, IDS significantly reduces or eliminates postoperative sensitivity by sealing dentinal tubules and preventing fluid movement within dentin.

What materials should be avoided with IDS?

• Eugenol-containing temporary cements (inhibit polymerization)
• Polyether impression materials (can bond to resin surface and tear)

Is air abrasion necessary before final cementation?

Yes, air abrasion is recommended to reactivate the IDS surface, remove contamination, and improve micromechanical retention before bonding.

What is the ideal thickness of the resin coating layer?

The recommended thickness is approximately 0.5 mm to ensure effective stress absorption and protection of the adhesive interface.

How long should you wait after adhesive application in IDS?

A waiting period of about 5 minutes is recommended to allow bond maturation (Decoupling With Time), ensuring stronger and more stable adhesion.

Is IDS technique-sensitive?

Yes, IDS is technique-sensitive and requires proper isolation, correct adhesive application, and strict adherence to protocol for predictable results.

References

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2. Magne P, Kim TH, Cascione D, Donovan TE. Immediate dentin sealing improves bond strength of indirect restorations. Journal of Prosthetic Dentistry. 2005;94(6):511–519.
3. Paul SJ, Schärer P. Effect of provisional cements on the bond strength of various adhesive bonding systems on dentin. Journal of Oral Rehabilitation. 1997;24(1):8–14.
4. Pashley DH, Tay FR, Breschi L, et al. State of the art etch-and-rinse adhesives. Dental Materials. 2011;27(1):1–16.
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9. Hu X, Zhu Q. Clinical evaluation of immediate dentin sealing in indirect restorations. Journal of Adhesive Dentistry. 2010;12(3):215–222.
10. Van den Breemer CRG, et al. Clinical performance of indirect restorations with IDS: systematic review. Journal of Dentistry. 2019;87:1–13.
11. Hayashi M, et al. Observation of interfacial gaps using optical coherence tomography. Dental Materials. 2017;33(3):e1–e10.
12. Tagami J, Nikaido T, Nakajima M, et al. Hybridization of dentin and bonding durability. Dental Materials Journal. 2003;22(3):281–295.
13. Urabe I, et al. Influence of dentin bonding procedures on bond strength. Dental Materials Journal. 2000;19(1):31–39.
14. Shafiei F, et al. Effect of proanthocyanidin on dentin bond durability. Journal of Adhesive Dentistry. 2020;22(2):117–124.