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Related Concept Videos

Polyprotic Acids03:38

Polyprotic Acids

Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

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...
Acid Strength and Molecular Structure03:05

Acid Strength and Molecular Structure

Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

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Related Experiment Video

Updated: Jun 17, 2026

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

Compromised bond strength after root dentin deproteinization reversed with ascorbic acid.

Leonardo Fernandes da Cunha1, Adilson Yoshio Furuse, Rafael Francisco Lia Mondelli

  • 1Department of Operative Dentistry, Endodontics, and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil. cunha_leo@yahoo.com.br

Journal of Endodontics
|December 17, 2009
PubMed
Summary

Ascorbic acid reversed bond strength loss caused by dentin deproteinization, restoring it to control levels. Both self-adhesive and dual-cured cements showed similar performance, with regional differences noted in bond strength.

Related Experiment Videos

Last Updated: Jun 17, 2026

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

Area of Science:

  • Endodontics
  • Dental Materials Science
  • Adhesive Dentistry

Background:

  • Dentin deproteinization affects root canal bond strength.
  • Understanding the impact of reducing agents on cement bond strength is crucial for endodontic procedures.

Purpose of the Study:

  • To evaluate the effect of a reducing agent (ascorbic acid) on the bond strength of deproteinized root canal dentin.
  • To compare the bond strength when using self-adhesive versus dual-cured cements.
  • To assess regional differences in bond strength within the root canal.

Main Methods:

  • 45 bovine incisor roots were divided into three groups: control, sodium hypochlorite (NaOCl) deproteinization, and NaOCl followed by ascorbic acid treatment.
  • Fiber posts were cemented using either RelyX U100 (self-adhesive) or RelyX ARC (dual-cured) with specific bonding agents.
  • Push-out bond strength was measured after 24 hours and analyzed using three-way ANOVA and Dunnett T3 tests.

Main Results:

  • Deproteinization with NaOCl significantly reduced bond strength.
  • Subsequent treatment with ascorbic acid effectively reversed this reduction, restoring bond strength to control levels.
  • No significant difference in bond strength was found between the self-adhesive (RelyX U100) and dual-cured (RelyX ARC) cements.
  • Coronal dentin exhibited higher bond strength than middle and apical regions.

Conclusions:

  • Ascorbic acid can successfully reverse the negative impact of dentin deproteinization on bond strength.
  • RelyX U100 and RelyX ARC demonstrated comparable performance in this context.
  • Regional variations in root canal dentin bond strength exist, with the coronal portion being strongest.