Mechanical properties, shrinkage stress, cuspal strain and fracture resistance of molars restored with bulk-fill composites and incremental filling technique

Mechanical properties, shrinkage stress, cuspal strain and fracture resistance of molars restored with bulk-fill composites and incremental filling technique

Abstract Objectives To compare bulk-fill with incremental filling techniques for restoring large mesio-occlusal-distal (MOD) restorations. Methods Seventy-five molars with MOD preparations were divided into five groups: Z350XT, incrementally filled with Filtek Z350XT and four bulk-fills—FBF/Z350XT,...

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Bibliographic Details
Published in:Journal of dentistry Vol. 43; no. 12; pp. 1519 - 1528
Main Authors: Rosatto, C.M.P, Bicalho, A.A, Veríssimo, C, Bragança, G.F, Rodrigues, M.P, Tantbirojn, D, Versluis, A, Soares, C.J
Format: Journal Article
Language:English
Published: England Elsevier Ltd 01-12-2015
Elsevier Limited
Subjects:
Biomechanics
Bulk-fill
Composite materials
Composite resin
Composite Resins - chemistry
Cracks
Cuspal strain
Dental Cavity Preparation - methods
Dental Enamel - physiopathology
Dental Materials - chemistry
Dental Restoration, Permanent - methods
Dental Stress Analysis
Dentin
Dentistry
Enamel
Finite Element Analysis
Fracture mechanics
Fracture toughness
Fractures
Humans
Mechanical properties
Methacrylates - chemistry
Molar
Polymerization
Restoration
Shrinkage
Shrinkage stress
Strain
Strain gauges
Stress, Mechanical
Stresses
Teeth
Tensile strength
Mechanical properties
Bulk-fill
Cuspal strain
Finite element analysis
Shrinkage stress
Composite resin
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Summary:Abstract Objectives To compare bulk-fill with incremental filling techniques for restoring large mesio-occlusal-distal (MOD) restorations. Methods Seventy-five molars with MOD preparations were divided into five groups: Z350XT, incrementally filled with Filtek Z350XT and four bulk-fills—FBF/Z350XT, Filtek Bulk Fill/Filtek Z350XT; VBF/CHA, Venus Bulk Fill/Charisma Diamond; SDR/EST-X, SDR/Esthet-X HD; TEC, TetricEvoCeram Bulk Fill. Cuspal strains were measured using strain-gauges ( n = 10): CSt-Re, during restorative procedure; CSt-100N, during 100N occlusal loading; CSt-Fr, at fracture load. Before fracture load, teeth were load-cycled. Fracture resistance, fracture mode, and enamel cracks were recorded. The other five teeth were used for Elastic modulus (E) and Vickers hardness (VH). Post-gel shrinkage (Shr), diametral tensile strength (DTS) and compressive strength (CS) were determined ( n = 10). Shrinkage stresses were analyzed using finite element analysis. Results SDR had similar CS values as TEC, lower than all other composites. CHA had similar DTS values as Z350XT, higher than all other composites. Z350XT had the highest mean Shr and SDR the lowest Shr. New enamel cracks and propagation was observed after the restoration, regardless of filling technique. Z350XT had lower fracture resistance than bulk-fill composite techniques. No significant differences in failure modes were found. E and VH were constant through the depth for all techniques. Bulk-filling techniques had lower stresses compared to Z350XT. Conclusions Flowable bulk-fill composites had lower mechanical properties than paste bulk-fill and conventional composites. All bulk-fill composites had lower post-gel shrinkage than conventional composite. Bulk-fill filling techniques resulted in lower cusp strain, shrinkage stress and higher fracture resistance. Clinical significance Using bulk-fill composites cause lower CSt wich indicates lower stress in restored tooth. Furthermore, bulk-fill composites have a higher fracture resistance. Therefore, clinicians may choose the bulk-fill composite to decrease undesirable effects of restoration while simplifying filling procedure.
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ISSN:0300-5712
1879-176X
DOI:10.1016/j.jdent.2015.09.007