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

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Composites associated with pulp-protection material: color-stability analysis after accelerated artificial aging.

Diogo Rodrigues Cruvinel¹, Lucas da Fonseca Roberti Garcia, Simonides Consani

¹Post-graduate student, Ribeirao Preto School of Dentistry, University of São Paulo, Ribeirao Preto, SP, Brazil.

European Journal of Dentistry

|January 5, 2010

Summary

The type of pulp protector significantly impacts dental composite color stability under accelerated aging. Calcium hydroxide (CH) and glass ionomer cement (GIC) protectors influence composite color differently, with Concept showing greater color change than QuixFil.

Keywords:

Accelerated artificial aging Color stability Composites Pulp protection

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Area of Science:

Dental Materials Science
Restorative Dentistry
Biomaterials

Background:

Color stability is crucial for aesthetic dental restorations.
Pulp protectors are used to shield the dental pulp from restorative materials.
Accelerated artificial aging (AAA) is a method to predict long-term material performance.

Purpose of the Study:

To evaluate the color stability of two dental composites (Concept and QuixFil) when used with two different pulp protectors (calcium hydroxide - CH and glass ionomer cement - GIC).
To assess the influence of accelerated artificial aging (AAA) on the color stability of these material combinations.

Main Methods:

Sixty specimens were prepared with either CH or GIC as a pulp protector, covered by a dental composite (Concept or QuixFil), or a control group without protection.
Color parameters (L*, a*, b*, DeltaE) were measured using a spectrophotometer before and after 384 hours of AAA.
Statistical analysis included a 2-way ANOVA with Bonferroni post-hoc test.

Main Results:

Composites with CH protectors exhibited lower lightness (L*) and higher b* values compared to GIC and control groups.
The Concept composite showed significantly higher total color variation (DeltaE) than QuixFil across most conditions.
The interaction between protector type and composite influenced color stability, with Concept showing less difference from QuixFil when used with GIC.

Conclusions:

Pulp protector material choice influences the color stability of overlying dental composites.
Accelerated artificial aging exacerbates color changes, with the extent depending on the composite type.
Glass ionomer cement may offer better color stability for certain composites compared to calcium hydroxide under aging conditions.