Evaluation of the Marginal Integrity of Nano-Filled Resin Composite Restorations Using Guided Light Polymerization Technique in Anterior Teeth: In-Vitro Study

Document Type : Original Article

Authors

1 conservative Dentistry, Faculty of Dentistry Cairo University

2 Conservative Dentistry, Faculty of Dentistry, Suez Canal University

Abstract

Aim: assess the marginal adaptation of nano-filled resin composite in class III with two different preparations depths using LED variable intensities and guided light polymerization method.
Materials and methods: A total of 16 sound, non-carious maxillary anterior teeth were used in the study. The samples were divided into two main equal groups according to the LED curing intensity either high intensity LED (1400 mW/ cm2) or conventional LED intensity (800 mW/ cm2). According to the depth of the preparations each group was further subdivided into two equal subgroups of four teeth; either deep or shallow standardized class III preparations. All the preparations were restored with nano-filled resin composite material and subjected to a thermo-cycling protocol. Marginal analysis was performed using Environmental Scanning Electron Microscope (ESEM). Two-way ANOVA was applied to detect the effect of different LED intensities and the two different preparation depths and the interaction between them.
Results: Results showed that marginal gap for high intensity LED is higher than the conventional intensity. In additions, the marginal gap showed statistically significant higher results for the shallow preparations compared to the deep ones (p<0.001). The marginal gap pattern was the same for both preparation depths with higher marginal gap values in favor of the high intensity LED.
Conclusions: Cavity preparation depth and the remaining wall thickness significantly affected the resin restoration adaptation in guided light polymerization technique

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Advanced Dental Journal
Volume 7, Issue 3
July 2025
Pages 375-385

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