Relationships between Flexural and Bonding Properties, Marginal Adaptation, and Polymerization Shrinkage in Flowable Composite Restorations for Dental Application

To evaluate the flexural and bonding properties, marginal adaptation, and polymerization shrinkage in flowable composite restorations and their relationships, four new generation flowable composites, one conventional, and one bulk-fill flowable composite were used in this study. Flexural properties...

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Bibliographic Details
Published in:Polymers 2021-08, Vol.13 (16), p.2613
Main Authors: Tsujimoto, Akimasa, Irie, Masao, Teixeira, Erica Cappelletto Nogueira, Jurado, Carlos Alberto, Maruo, Yukinori, Nishigawa, Goro, Matsumoto, Takuya, Garcia-Godoy, Franklin
Format: Article
Language:English
Subjects:
Adaptation
Addition polymerization
Adhesives
Bond strength
Bonding strength
Bulk polymerization
Composite materials
Curing
Dental materials
Dentin
Dentistry
Drinking water
Enamel
Hypotheses
Light emitting diodes
Manufacturers
Mechanical properties
Polymerization
Shrinkage
Software
Teeth
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Summary:To evaluate the flexural and bonding properties, marginal adaptation, and polymerization shrinkage in flowable composite restorations and their relationships, four new generation flowable composites, one conventional, and one bulk-fill flowable composite were used in this study. Flexural properties of the composites and shear bond strength to enamel and dentin for flowable restorations were measured immediately and 24 h after polymerization. Marginal adaptation, polymerization shrinkage, and stress were also investigated immediately after polymerization. The flexural properties, and bond strength of the flowable composites to enamel and dentin were much lower immediately after polymerization than at 24 h, regardless of the type of the composite. Polymerization shrinkage and stress varied depending on the material, and bulk-fill flowable composite showed much lower values than the others. The marginal adaptation and polymerization shrinkage of the composites appeared to have a much stronger correlation with a shear bond strength to dentin than to enamel. The weak mechanical properties and bond strengths of flowable composites in the early stage after polymerization must be taken into account when using them in the clinic. In addition, clinicians should be aware that polymerization shrinkage of flowable composites can still lead to the formation of gaps and failure of adaptation to the cavity regardless of the type of composite.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym13162613