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Related Experiment Video

Updated: Apr 15, 2026

Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation

Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation

Published on: July 21, 2014

Optimizing Dental Resin-Based Composite Polymerization with Distance and Exposure Variables: Preliminary Study.

Anna Lehmann¹, Bolesław Barszcz², Kacper Nijakowski¹

¹Department of Conservative Dentistry, Poznan University of Medical Sciences, 60-812 Poznan, Poland.

Materials (Basel, Switzerland)

|April 14, 2026

Summary

Optimizing light curing distance and exposure mode is crucial for resin-based composites (RBCs) in dentistry. Closer light sources and specific modes enhance the degree of conversion (DC), improving restoration quality.

Keywords:

composite restoration degree of conversion exposure mode light-emitting diode polymerization resin-based composites

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Area of Science:

Dental Materials Science
Polymer Chemistry

Background:

Resin-based composites (RBCs) are essential in restorative dentistry.
Clinical success of RBCs relies heavily on achieving a high degree of conversion (DC).
Light-curing units initiate polymerization, but factors like distance and exposure mode can impact DC.

Purpose of the Study:

To investigate the influence of curing distance on the DC of RBCs.
To evaluate the effect of different polymerization modes (standard, soft-start, pulse) on DC.
To determine how these factors interact and affect polymerization efficiency.

Main Methods:

Standardized RBC specimens were prepared.
A light-emitting diode (LED) curing unit was used at varying distances (0 mm, 2 mm, 4 mm).
Raman scattering spectra were employed to measure the DC at different sample locations (top and bottom).

Main Results:

DC varied significantly based on curing distance, exposure mode, and measurement location.
A significant effect of material type on DC was observed at the top surface (p < 0.001).
Curing distance significantly influenced DC (p = 0.049), while exposure mode did not significantly affect top surface DC (p = 0.391).

Conclusions:

Both curing distance and exposure mode significantly impact RBC polymerization efficiency.
Reducing the distance between the light source and composite surface enhances DC.
Appropriate exposure mode selection can partially mitigate the negative effects of increased curing distance.