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Related Experiment Video

Updated: Jan 29, 2026

Application of Light-cured Dental Adhesive Resin for Mounting Electrodes or Microdialysis Probes in Chronic Experiments

Application of Light-cured Dental Adhesive Resin for Mounting Electrodes or Microdialysis Probes in Chronic Experiments

Published on: July 30, 2007

Polymerization pattern characterization within a resin-based composite cured using different curing units at two

Afnan O Al-Zain¹, George J Eckert², Henry Lukic³

¹Restorative Dentistry Department, Faculty of Dentistry, King Abdulaziz University, P.O. Box: 80209, Jeddah, 21589, Saudi Arabia. alzain@kau.edu.sa.

Clinical Oral Investigations

|February 10, 2019

Summary

Light-curing units (LCUs) do not ensure uniform resin-based composite (RBC) polymerization, even at different distances. Localized irradiance does not predict polymerization outcomes, potentially increasing fracture risk.

Keywords:

Beam profile Cross-link density Degree of conversion Light-curing unit Microhardness Resin composite

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Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing

Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing

Published on: July 3, 2020

Area of Science:

Dental Materials Science
Polymer Chemistry
Biomaterials Engineering

Background:

Effective polymerization of resin-based composites (RBCs) is crucial for dental restorations.
Light-curing units (LCUs) deliver energy to initiate polymerization.
Variations in LCU output and distance can affect polymerization depth and uniformity.

Purpose of the Study:

To investigate the relationship between irradiance-beam-profile areas and the degree of conversion (DC), microhardness (KH), and cross-link density (CLD) in RBCs.
To assess polymerization at clinically relevant curing distances (2mm and 8mm).
To explore correlations between irradiance and polymerization metrics.

Main Methods:

Mapping approach using micro-Raman spectroscopy for DC and Knoop indentor for KH.
Cross-link density (CLD) estimated by %KH reduction after ethanol exposure.
Six different LCUs tested on nano-hybrid RBC at two distances, maintaining radiant exposure.
Irradiance beam profiles generated, and localized irradiance values calculated.

Main Results:

Significant non-uniform polymerization patterns observed at various depths and locations.
Localized irradiance values showed weak correlations with DC, KH, and %KH reduction.
Polymerization metrics varied significantly between 2mm and 8mm curing distances.

Conclusions:

Localized irradiance from LCUs did not accurately reflect polymerization patterns within the RBC.
Curing distance significantly impacts polymerization, but irradiance uniformity does not guarantee uniform outcomes.
Inconsistent polymerization may contribute to the risk of RBC fracture.