Influence of Factors in the Photopolymerization Process on Dental Composites Microhardness

The aim of the present paper is to investigate the influence of factors in photopolymerization process that govern microhardness of three types of dental composites—universal (UC), bulk-fill (BC), and flowable (FC). Cylindrical specimens with different thicknesses are made and light cured. The signi...

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Published inMaterials Vol. 15; no. 18; p. 6459
Main Authors Maximov, Jordan, Dikova, Tsanka, Duncheva, Galya, Georgiev, Georgi
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 17.09.2022
MDPI
Subjects
Adaptation
Composite materials
Curing
Dental cement
Dental materials
Dental matrices
Design of experiments
Diamond pyramid hardness
Hardness
irradiation time
layer thickness
Light
light intensity
light-cured dental composites
Luminous intensity
Measurement
Mechanical properties
microhardness
Photopolymerization
Photopolymers
Polymerization
Regression analysis
Testing
Thickness
Variance analysis
Viscosity
Bulgaria
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Abstract The aim of the present paper is to investigate the influence of factors in photopolymerization process that govern microhardness of three types of dental composites—universal (UC), bulk-fill (BC), and flowable (FC). Cylindrical specimens with different thicknesses are made and light cured. The significance of light intensity, irradiation time, and layer thickness on Vickers microhardness is evaluated by experimental design, analysis of variance, and regression analysis. It is found that the main factor influencing the microhardness on the top surface of the three composites is light intensity. The second factor is layer thickness for the UC and FC, while for BC, it is curing time. The third factor is curing time for the first two composites and layer thickness for bulk-fill. The significance of factors’ influence on the microhardness of the bottom surface is the same for the UC and FC, but different for BC. The main factor for the first two composites is layer thickness, followed by curing time and light intensity. For bulk-fill, curing time is main factor, light intensity is second, and layer thickness is last. Different significance of factors influencing the microhardness on top and bottom surfaces of investigated composites is revealed for the first time in the present study.
AbstractList The aim of the present paper is to investigate the influence of factors in photopolymerization process that govern microhardness of three types of dental composites—universal (UC), bulk-fill (BC), and flowable (FC). Cylindrical specimens with different thicknesses are made and light cured. The significance of light intensity, irradiation time, and layer thickness on Vickers microhardness is evaluated by experimental design, analysis of variance, and regression analysis. It is found that the main factor influencing the microhardness on the top surface of the three composites is light intensity. The second factor is layer thickness for the UC and FC, while for BC, it is curing time. The third factor is curing time for the first two composites and layer thickness for bulk-fill. The significance of factors’ influence on the microhardness of the bottom surface is the same for the UC and FC, but different for BC. The main factor for the first two composites is layer thickness, followed by curing time and light intensity. For bulk-fill, curing time is main factor, light intensity is second, and layer thickness is last. Different significance of factors influencing the microhardness on top and bottom surfaces of investigated composites is revealed for the first time in the present study.
Audience Academic
Author Duncheva, Galya
Georgiev, Georgi
Maximov, Jordan
Dikova, Tsanka
AuthorAffiliation 1 Faculty of Mechanical Engineering, Technical University of Gabrovo, 4 Hadji Dimitar Str., 5300 Gabrovo, Bulgaria
2 Faculty of Dental Medicine, Medical University of Varna, 84 Tsar Osvoboditel Blvd., 9000 Varna, Bulgaria
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  givenname: Georgi
  surname: Georgiev
  fullname: Georgiev, Georgi
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CitedBy_id crossref_primary_10_3390_ma17071554
crossref_primary_10_3390_polym14245346
crossref_primary_10_3390_ijms24076432
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  publication-title: Dent. Mater.
  doi: 10.1016/j.dental.2015.02.010
  contributor:
    fullname: Selig
– volume: 149
  start-page: 313
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  article-title: Polymerization mechanics of dental composites–advantages and disadvantages
  publication-title: Procedia Eng.
  doi: 10.1016/j.proeng.2016.06.672
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    fullname: Milosevic
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Snippet The aim of the present paper is to investigate the influence of factors in photopolymerization process that govern microhardness of three types of dental...
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SubjectTerms Adaptation
Composite materials
Curing
Dental cement
Dental materials
Dental matrices
Design of experiments
Diamond pyramid hardness
Hardness
irradiation time
layer thickness
Light
light intensity
light-cured dental composites
Luminous intensity
Measurement
Mechanical properties
microhardness
Photopolymerization
Photopolymers
Polymerization
Regression analysis
Testing
Thickness
Variance analysis
Viscosity
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Title Influence of Factors in the Photopolymerization Process on Dental Composites Microhardness
URI https://www.proquest.com/docview/2716581376
https://search.proquest.com/docview/2717693394
https://pubmed.ncbi.nlm.nih.gov/PMC9502933
https://doaj.org/article/42ba4d7256c34ee1a5ae3f57156dfb47
Volume 15
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