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Objective <p>This in vitro study aimed to evaluate the effect of composite preheating and light-curing mode on the colour stability of a nanohybrid and a nanofilled resin-based composite after exposure to a controlled coffee-staining protocol. The data presented represents a single observation and is not a part of another research project.</p> Results <p>Eighty-disc shaped specimens (10&#xa0;mm × 2&#xa0;mm) fabricated from G-aenial Universal Injectable and Filtek Supreme Flowable were assessed under different preheating and curing protocols, subdivided into 8 subgroups. All specimens exhibited colour changes exceeding the clinically perceptible threshold (ΔE &gt; 2.7) after staining. Mean colour change values ranged from 12.0 to 26.5. G-aenial Universal Injectable showed significantly greater discolouration than Filtek Supreme Flowable (<i>p</i> &lt; 0.001). Polywave curing resulted in higher mean ΔE values compared with monowave curing (<i>p</i> &lt; 0.001). Preheated specimens demonstrated greater colour change than non-preheated specimens for both materials. The highest discolouration occurred in the G-aenial preheated polywave subgroup (ΔE = 26.5), while the lowest occurred in the Filtek preheated monowave subgroup (ΔE = 12.0). Composite formulation, preheating, and curing mode were found to significantly influence colour stability following simulated coffee exposure.</p>

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Comparative analysis of color stability in preheated vs. non-preheated injectable composites under different curing protocols: an in-vitro study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月9日

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  • Karthik Shetty,
  • Ashwini Anand Kamat,
  • Roma Mascarenhas,
  • Heeresh Shetty,
  • Laxmish Mallya,
  • Annapoorna Shenoy

摘要

Objective

This in vitro study aimed to evaluate the effect of composite preheating and light-curing mode on the colour stability of a nanohybrid and a nanofilled resin-based composite after exposure to a controlled coffee-staining protocol. The data presented represents a single observation and is not a part of another research project.

Results

Eighty-disc shaped specimens (10 mm × 2 mm) fabricated from G-aenial Universal Injectable and Filtek Supreme Flowable were assessed under different preheating and curing protocols, subdivided into 8 subgroups. All specimens exhibited colour changes exceeding the clinically perceptible threshold (ΔE > 2.7) after staining. Mean colour change values ranged from 12.0 to 26.5. G-aenial Universal Injectable showed significantly greater discolouration than Filtek Supreme Flowable (p < 0.001). Polywave curing resulted in higher mean ΔE values compared with monowave curing (p < 0.001). Preheated specimens demonstrated greater colour change than non-preheated specimens for both materials. The highest discolouration occurred in the G-aenial preheated polywave subgroup (ΔE = 26.5), while the lowest occurred in the Filtek preheated monowave subgroup (ΔE = 12.0). Composite formulation, preheating, and curing mode were found to significantly influence colour stability following simulated coffee exposure.