Journal article
Effect of Layering Techniques on Polymerization Shrinkage Stress of High- and Low-viscosity Bulk-fill Resins
Operative dentistry, Vol.45(6), pp.655-663
11/01/2020
DOI: 10.2341/19-217-L
PMID: 32674133
Abstract
CLINICAL RELEVANCEThe use of layering techniques is still advisable with many bulk-fill resins and should be the default unless a particular resin is known to not need it. SUMMARYObjective: The purpose of this study was to investigate how layering techniques affect polymerization shrinkage stresses of high-and low-viscosity bulk-fill resins.Method: Six high-viscosity and six low-viscosity bulk-fill resins were evaluated. Aluminum blocks with a mesial-occlusal-distal (MOD) cavity were machined and randomly divided into groups for different filling techniques (bulk-fill vs horizontal layering vs oblique layering) and further subdivided according to type of resin (high- vs low-viscosity). The cuspal deflection resulting from the polymerization of bulk-fill resin bonded to a MOD cavity within an aluminum block was measured with a digimatic micrometer. Scanning electron microscopy analyses of tested resins were also conducted.Results: In the high-viscosity bulk-fill resins, cuspal deflection of the MOD cavity ranged from 11.2 to 18.2 μm with the bulk-filling technique, from 10.7 to 15.5 μm with the horizontal layering technique, and from 10.9 to 15.2 μm with the oblique layering technique. In the low-viscosity bulk-fill resins, cuspal deflection of the material ranged from 9.2 to 19.8 μm with the bulk-filling technique, from 8.2 to 15.7 μm with the horizontal layering technique, and from 8.4 to 16.4 μm with the oblique layering technique.Conclusion: Cuspal deflections for some high-and low-viscosity bulk-fill resins were significantly reduced by using layering techniques, but the resultant improvement of layering techniques was not applicable to all the bulk-fill resins used in this study.
Details
- Title: Subtitle
- Effect of Layering Techniques on Polymerization Shrinkage Stress of High- and Low-viscosity Bulk-fill Resins
- Creators
- Akimasa Tsujimoto - Operative Dentistry, Nihon University School of DentistryCarlos A Jurado - Clinical Digital Dentistry, A.T. Still University, Arizona School of Dentistry and Oral HealthWayne W Barkmeier - General Dentistry, Creighton University School of DentistryMohammed E Sayed - Prosthodontics, Jazan University College of DentistryToshiki Takamizawa - Operative Dentistry, Nihon University School of DentistryMark A Latta - General Dentistry, Creighton University School of DentistryMasashi Miyazaki - Operative Dentistry, Nihon University School of DentistryFranklin Garcia-Godoy - Bioscience Research, University of Tennessee Health Science Center College of Dentistry
- Resource Type
- Journal article
- Publication Details
- Operative dentistry, Vol.45(6), pp.655-663
- DOI
- 10.2341/19-217-L
- PMID
- 32674133
- ISSN
- 0361-7734
- eISSN
- 1559-2863
- Language
- English
- Date published
- 11/01/2020
- Academic Unit
- Prosthodontics; Operative Dentistry
- Record Identifier
- 9984176686602771
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