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Evaluating the Effects of Different Polishing Methods on Color Stability of Dental Restorations in Pediatric Dentistry

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Published on: June 6, 2025

Light curable dental composites designed with colloidal crystal reinforcement.

Quan Wan¹, Joel Sheffield, John McCool

¹Center for Bioengineering and Biomaterials, College of Engineering, Temple University, 1947 North 12th Street, Philadelphia, PA 19122, United States.

Dental Materials : Official Publication of the Academy of Dental Materials

|May 24, 2008

Summary

Ordered filler arrangements in dental composites significantly enhance mechanical properties. This study found that ordered silica fillers dramatically improved compressive strength, failure strain, and toughness compared to non-ordered composites.

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Published on: July 21, 2014

Area of Science:

Materials Science
Biomaterials Engineering
Colloid Science

Background:

Dental composites require optimized filler arrangements for improved mechanical performance.
Colloidal crystallization offers a strategy for creating periodic filler structures.
Understanding the influence of processing parameters on filler ordering is crucial.

Purpose of the Study:

To investigate methods for preparing dental composites with periodic filler arrangements using colloidal crystallization.
To determine the impact of suspension medium, silane treatment, and amine additives on particle ordering.
To evaluate how filler ordering affects the mechanical properties of dental composites.

Main Methods:

Monodisperse silica particles (approx. 500 nm) were dispersed in solvents and monomers like triethyleneglycol dimethacrylate (TEGDMA).
Particle ordering was assessed using microscopy.
Mechanical properties of the resulting composites (60 wt% silica) were measured via compression tests.

Main Results:

A face-centered cubic packed structure was achieved in sediments and stable TEGDMA dispersions.
Dimethylaminoethyl methacrylate (DMAEMA) disrupted ordering in non-silanized silica dispersions.
Silanization with 3-methacryloxypropyl trimethoxysilane (MPS) promoted filler ordering.
DMAEMA significantly affected failure strain, compressive strength, and toughness (p<0.05).

Conclusions:

Significant improvements in composite mechanical properties were observed with ordered fillers.
Compressive strength increased by 16%, failure strain by 71%, and toughness by 135%.