Correlation between different methodologies used to evaluate the marginal adaptation of proximal dentin gingival margins elevated using a glass hybrid
Ismail Hoda S., Morrow Brian R., Ali Ashraf I., Mehesen Rabab El., Garcia-Godoy Franklin, Mahmoud Salah H.,
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( Ismail Hoda S. ) - Mansoura University Faculty of Dentistry Department of Operative Dentistry
( Morrow Brian R. ) - University of Tennessee Health Science Center College of Dentistry Department of Bioscience Research
( Ali Ashraf I. ) - Mansoura University Faculty of Dentistry Department of Operative Dentistry
( Mehesen Rabab El. ) - Mansoura University Faculty of Dentistry Department of Operative Dentistry
( Garcia-Godoy Franklin ) - University of Tennessee Health Science Center College of Dentistry Department of Bioscience Research
( Mahmoud Salah H. ) - Mansoura University Faculty of Dentistry Department of Operative Dentistry
Abstract
Objectives This study aimed to evaluate the effect of aging on the marginal quality of glass hybrid (GH) material used to elevate dentin gingival margins, and to analyze the consistency of the results obtained by 3 in vitro methods.
Materials and Methods Ten teeth received compound class II cavities with subgingival margins. The dentin gingival margins were elevated with GH, followed by resin composite. The GH/gingival dentin interfaces were examined through digital microscopy, scanning electron microscopy (SEM) using resin replicas, and according to the World Dental Federation (FDI) criteria. After initial evaluations, all teeth were subjected to 10,000 thermal cycles, followed by repeating the same marginal evaluations and energy dispersive spectroscopy (EDS) analysis for the interfacial zone of 2 specimens. Marginal quality was expressed as the percentage of continuous margin at ×200 for microscopic techniques and as the frequency of each score for FDI ranking. Data were analyzed using the paired sample t-test, Wilcoxon signed-rank test, and Pearson and Spearmen correlation coefficients.
Results None of the testing techniques proved the significance of the aging factor. Moderate and strong significant correlations were found between the testing techniques. The EDS results suggested the presence of an ion-exchange layer along the GH/gingival dentin interface of aged specimens.
Conclusions The marginal quality of the GH/dentin gingival interface defied aging by thermocycling. The replica SEM and FDI ranking results had stronger correlations with each other than either showed with the digital microscopy results.
키워드
Deep margin elevation; Open sandwich technique; Marginal quality; Glass hybrid; In vitro FDI ranking
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