Influence of Matrix Type on Marginal Gap Formation of Deep Class II Bulk-Fill Composite Restorations

Britta Hahn, Imme Haubitz, Ralf Krug, Gabriel Krastl and Sebastian Soliman
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Britta Hahn: Department of Conservative Dentistry and Periodontology, University Hospital Würzburg, Pleicherwall 2, 97070 Würzburg, Germany
Imme Haubitz: Department of Conservative Dentistry and Periodontology, University Hospital Würzburg, Pleicherwall 2, 97070 Würzburg, Germany
Ralf Krug: Department of Conservative Dentistry and Periodontology, University Hospital Würzburg, Pleicherwall 2, 97070 Würzburg, Germany
Gabriel Krastl: Department of Conservative Dentistry and Periodontology, University Hospital Würzburg, Pleicherwall 2, 97070 Würzburg, Germany
Sebastian Soliman: Department of Conservative Dentistry and Periodontology, University Hospital Würzburg, Pleicherwall 2, 97070 Würzburg, Germany

IJERPH, 2022, vol. 19, issue 9, 1-12

Abstract: Background: To test the hypothesis that transparent matrices result in more continuous margins of bulk-fill composite (BFC) restorations than metal matrices. Methods: Forty standardized MOD cavities in human molars with cervical margins in enamel and dentin were created and randomly assigned to four restorative treatment protocols: conventional nanohybrid composite (NANO) restoration (Tetric EvoCeram, Ivoclar Vivadent, Schaan, Liechtenstein) with a metal matrix (NANO-METAL) versus transparent matrix (NANO-TRANS), and bulk-fill composite restoration (Tetric EvoCeram Bulk Fill, Ivoclar Vivadent, Schaan, Liechtenstein) with a metal matrix (BFC-METAL) versus transparent matrix (BFC-TRANS). After artificial aging (2500 thermal cycles), marginal quality was evaluated by scanning electron microscopy using the replica technique. Statistical analyses were performed using the Mann–Whitney U-test and Wilcoxon test. The level of significance was p < 0.05. Results: Metal matrices yielded significantly ( p = 0.0011) more continuous margins (46.211%) than transparent matrices (27.073%). Differences in continuous margins between NANO (34.482%) and BFC (38.802%) were not significant ( p = 0.56). Matrix type did not influence marginal gap formation in BFC ( p = 0.27) but did in NANO restorations ( p = 0.001). Conclusion: Metal matrices positively influence the marginal quality of class II composite restorations, especially in deep cavity areas. The bulk-fill composite seems to be less sensitive to the influence of factors such as light polymerization and matrix type.

Keywords: transparent matrix; metal matrix; bulk-fill technique; centripetal technique; marginal gap formation; class II restoration; SEM (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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