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Related Concept Videos

Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

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The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
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Related Experiment Video

Updated: Dec 28, 2025

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

659

Dentinal substrate variability and bonding effectiveness: SEM investigation.

V Campanella1, G Gallusi1, R Nardi1

  • 1Department of Clinical Sciences and Translational Medicine, Dental School, University of Rome "Tor Vergata", Rome, Italy.

Journal of Biological Regulators and Homeostatic Agents
|February 18, 2020
PubMed
Summary
This summary is machine-generated.

Adhesive systems perform differently on compromised dentin. Caries-affected and discolored dentin show reduced resin tag formation, impacting dental restoration bonding efficacy.

Keywords:
adhesion to dentincaries affected dentindentinal substratesdiscoloured dentinmicro-morphologyresin-tags

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Restorative Dentistry

Background:

  • Extensive research documents adhesive system performance on normal dentin.
  • Limited data exists on adhesive interactions with compromised dentin substrates.
  • Understanding these interactions is crucial for effective dental restorations.

Purpose of the Study:

  • To analyze the microscopic structural aspects of the adhesive interface on altered dentin.
  • To compare adhesive performance on caries-affected dentin versus dentin contaminated by metallic oxides.
  • To investigate the influence of dentin substrate variability on adhesive bonding.

Main Methods:

  • Thirty teeth were divided into three groups: normal dentin, caries-affected dentin, and dentin contaminated by metallic oxides.
  • Experimental cavities exposed both pathologic and sound dentin portions.
  • Specimens were restored using a micro-hybrid composite, total-etch technique, and a two-step adhesive system, followed by SEM analysis (direct observation and decalcification).

Main Results:

  • SEM revealed differences in adhesive interface thickness and morphology based on dentin substrate.
  • Caries-affected dentin exhibited less distinctive resin tags with fewer micro-tags.
  • Discolored dentin showed poor adhesive infiltration and limited resin tag formation, likely due to altered tubular structures.

Conclusions:

  • The micro-morphological variability of dentin substrates significantly influences adhesive bonding.
  • Compromised dentin, including caries-affected and discolored types, results in qualitative and quantitative differences in resin tag formation.
  • These findings highlight the importance of considering dentin condition for successful clinical bonding of dental restorations.