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Related Experiment Videos

Effect on bonding of curing through dentin.

S Uno1, E Asmussen

  • 1School of Dentistry, Hokkaido University, Sapporo, Japan.

Acta Odontologica Scandinavica
|October 1, 1991
PubMed
Summary

Dentin thickness significantly impacts dental composite bonding strength by potentially attenuating light. This finding is crucial for optimizing light-cured dental restorations and ensuring durable adhesion.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesive Dentistry

Background:

  • Accurate light curing is essential for composite resin polymerization and bond strength.
  • Dentin's optical properties can influence light transmission, potentially affecting polymerization depth.
  • The Gluma system is a simplified method for dentin treatment prior to bonding.

Purpose of the Study:

  • To investigate how dentin thickness affects the shear bond strength of composite resin to treated dentin.
  • To examine the influence of composite resin thickness, irradiation time, and shade on bond strength.
  • To understand the interaction between dentin thickness and other curing parameters.

Main Methods:

  • Shear bond strength testing was performed on dentin samples treated with a simplified Gluma system.
  • Varying thicknesses of dentin (1-3 mm) were placed between the light guide and composite resin.
  • Composite resin thickness (2-3 mm), irradiation times (20-60 sec), and shades (universal, brown) were systematically varied.

Main Results:

  • Dentin thickness was found to significantly influence shear bond strength.
  • A significant interaction was observed between dentin thickness and composite resin thickness, irradiation time, and shade.
  • Increased dentin thickness appeared to attenuate light, similar to composite resin layers.

Conclusions:

  • Dentin thickness is a critical factor affecting the shear bond strength of dental composites.
  • The optical properties of dentin play a role in light attenuation during the curing process.
  • Optimizing light delivery and considering dentin thickness are important for predictable composite restorations.

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