Smart Dentin Replacement Overview

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Questions and Answers

What is a primary disadvantage of composite resin materials?

  • Color instability
  • Excessive strength
  • Low viscosity
  • Shrinkage during polymerization (correct)

Adhesive fracture can occur if the stress from composite shrinkage is too high.

True (A)

What type of material replaces lost dentin after cavity preparation?

SDR (Smart Dentin Replacement)

Adhesives made of __________ are commonly used in bonding composite materials.

<p>methacrylate</p> Signup and view all the answers

Match the following bonding techniques with their characteristics:

<p>Selective Etching = Improves bond strength by selectively removing the smear layer Cumbersome Layering = Involves building up material in increments to reduce stress Light-curing = Requires a specific light to initiate polymerization Fiber Reinforcement = Enhances the strength of the composite material through reinforcement</p> Signup and view all the answers

What can happen in extreme cases of stress buildup from shrinkage?

<p>Debonding of surfaces (B)</p> Signup and view all the answers

Incremental layering techniques do not pose any disadvantages.

<p>False (B)</p> Signup and view all the answers

The __________ builds up stress during the polymerization of composite materials.

<p>adhesive</p> Signup and view all the answers

What is the maximum thickness for increments when using the incremental technique?

<p>2 mm (C)</p> Signup and view all the answers

Using more than 2 mm increments in a composite restoration exclusively leads to better results.

<p>False (B)</p> Signup and view all the answers

What is the primary concern related to the shrinkage of composite materials during polymerization?

<p>Microcracking in the bulk (A)</p> Signup and view all the answers

Selective etching is a bonding technique that involves total etching of the surface.

<p>False (B)</p> Signup and view all the answers

What is the primary benefit of SDR (Self-Leveling Resin)?

<p>Reduction of procedure steps</p> Signup and view all the answers

What concentration of phosphoric acid is commonly used for etching in bonding techniques?

<p>37%</p> Signup and view all the answers

If no adhesive is used and the resin is light-cured, this can lead to __________ and gap formation.

<p>shrinkage</p> Signup and view all the answers

To prevent microcracking in composite restorations, it is recommended to use the incremental and __________ technique.

<p>layering</p> Signup and view all the answers

Match the following materials with their characteristics:

<p>Barium = Filler material Iron oxide = Colorant Alumino-fluoro-silicate glass = Used in composite restorations SDR = Self-leveling consistency</p> Signup and view all the answers

Which of the following is NOT a benefit of utilizing SDR?

<p>Requires multiple layering techniques (C)</p> Signup and view all the answers

Flowable composites do not require incremental application.

<p>False (B)</p> Signup and view all the answers

What can occur if the composite material is over dried after etching?

<p>Dehydration of dentinal tubules (C)</p> Signup and view all the answers

What is the purpose of using a Compula® Tip during composite restoration?

<p>Exact placement of material</p> Signup and view all the answers

Finishing and polishing composite restorations should be performed aggressively for a better outcome.

<p>False (B)</p> Signup and view all the answers

What is the preferred appearance of enamel after etching to ensure adequate bonding?

<p>Moist</p> Signup and view all the answers

Flashcards

Composite Shrinkage

The contraction of composite materials during curing, creating stress.

Adhesive Fracture

A crack in the adhesive layer between the composite and tooth, resulting from excessive stress.

Tooth Fracture

A break in the tooth structure from extreme stress caused by shrinkage.

Cumbersome Layering

A technique to overcome stress build-up by applying composite in small increments (2mm at a time).

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Cumbersome Light curing

Applying composite material in small measurements and curing incrementally to avoid buildup of stress.

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SDR

Smart Dentin Replacement ; Lost dentin is replaced with a new material.

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Methacrylate

Material used in bonding agents; creates high tension during curing.

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Composite Resin

A restoration material that is prone to shrinkage, causing stress.

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Selective Etching

A bonding technique used in composite restorations to create a stronger bond, but not total etching of the tooth structure, as deep pulpal floors are avoided

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Bulk Technique (Composite)

Placement of excess composite filling material (more than 2mm), leading to stress, contraction, and potential microcracking.

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Incremental/Layering Technique

A composite application strategy to mitigate shrinkage stress. Placing thin layers reduces stress.

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Low Viscosity Composite

Composite material with a lower thickness. This reduces stress and the risk of microcracking.

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Finishing/Polishing

The final surface shaping to create a smooth, high-quality restoration surface; Avoid excessively harsh procedures.

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Microcracking

Small cracks formed in the composite material or bonding area due to stress.

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Over Drying (Dental Procedures)

Drying composite materials or tissues too much can cause undesirable outcomes, like cellular damage or dehydration.

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Unconstrained Shrinkage

When composite is cured without proper support, like an adhesive, it shrinks more significantly, creating larger gaps and weakening the restoration.

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Bulk Application

Applying a thicker layer of composite material at once, exceeding the recommended 2mm increment.

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Increment Technique

Applying composite in small, 2mm layers, allowing each layer to cure before adding the next, minimizing stress.

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SDR Benefits

SDR offers advantages like ease of use, bulk application, aesthetic appeal, reduced steps, and adaptable consistency.

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Self-leveling Consistency

The flowable nature of SDR allows it to spread evenly and fill the cavity, preventing air bubbles and gaps.

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SDR vs. Conventional Composite

SDR reduces stress by minimizing shrinkage and offers bulk application, while conventional composite requires incremental curing and careful placement.

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Study Notes

Smart Dentin Replacement (SDR)

  • SDR composite material shrinks during polymerization, affecting direct composite restorations.
  • Shrinkage is a primary disadvantage of composite resins.
  • Bonding agents create high tension during curing, leading to cracks and weakened surfaces.
  • SDR uses new materials and techniques to address these issues.
  • Research aims to reduce contraction stress caused by shrinkage, preventing microcracking, interface weakening, and debonding.

Composition and Function

  • SDR uses EBPADMA urethane resin, di-functional diluent, barium and strontium alumino-fluoro-silicate glass filler, initiator curing, iron oxide, and SDR (urethane dimethacrylate).
  • The materials have specific functions, including structural support, crosslinking, filling, light visible color, and stress reduction.

Shrinkage Issues and Solutions

  • Adhesive use: Composite shrinkage can be countered by adhesion. Adhesive attempts to counter shrinkage stress. High stress can lead to fractures.
  • Stress management: Cumbersome layering and light curing techniques address stress buildup in composite structures.
  • Incremental technique: Applying 2mm increments of material with adhesive avoids stress buildup. Using 2mm increments avoids problems.

SDR Application and Benefits

  • SDR is applied in bulk, reducing shrinkage stress by 60% compared to other posterior restorative composites.
  • A patented modulator in the formula reduces stress at tooth interfaces.
  • SDR is suitable for small class I and II cavities, pit and fissure sealants, and tooth preparation.
  • SDR offers simple, efficient procedures with bulk application, aesthetic results, and durable outcomes.
  • Self-leveling and flow-like consistency ensures perfect adaptation, minimizing air bubbles, and enhancing application convenience.

SDR Monomer Polymerization

  • Flowable SDR composite is applied incrementally (2mm) to prevent shrinkage and subsequent weakening.
  • Modulators in the SDR monomer prevent shrinkage-related stresses and debonding.
  • SDR can be applied in bulk up to 4mm increments.

Additional Notes

  • Avoiding excessive shrinkage is key to successful composite restorations.
  • Techniques like incremental layering and low viscosity materials help prevent contraction-induced damage.
  • Selective etching techniques, along with adhesive application, are important.
  • Proper finishing and polishing are necessary after SDR application.
  • Contraction stress from shrinkage is a major factor negatively impacting composite restoration success.

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