Optimization of Photopolymerization Process of Dental Composites
The aim of this paper is to perform optimization of photopolymerization process of dental composites in order to obtain maximum hardness. Samples (5 mm diameter; 2, 3 and 4 mm thickness) were made of Universal Composite (UC), Bulk fill Composite (BC) and Flowable Composite (FC). Light curing of spec...
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doaj-fa3b227c76c34fb28d3cc498c7c86fbf2021-04-28T23:06:35ZengMDPI AGProcesses2227-97172021-04-01977977910.3390/pr9050779Optimization of Photopolymerization Process of Dental CompositesTsanka Dikova0Jordan Maximov1Vladimir Todorov2Georgi Georgiev3Vladimir Panov4Faculty of Dental Medicine, Medical University of Varna, 84 Tsar Osvoboditel Blvd, 9000 Varna, BulgariaFaculty of Mechanical Engineering, Technical University of Gabrovo, 4 Hadji Dimitar Str, 5300 Gabrovo, BulgariaFaculty of Mechanical Engineering, Technical University of Gabrovo, 4 Hadji Dimitar Str, 5300 Gabrovo, BulgariaFaculty of Dental Medicine, Medical University of Varna, 84 Tsar Osvoboditel Blvd, 9000 Varna, BulgariaFaculty of Dental Medicine, Medical University of Varna, 84 Tsar Osvoboditel Blvd, 9000 Varna, BulgariaThe aim of this paper is to perform optimization of photopolymerization process of dental composites in order to obtain maximum hardness. Samples (5 mm diameter; 2, 3 and 4 mm thickness) were made of Universal Composite (UC), Bulk fill Composite (BC) and Flowable Composite (FC). Light curing of specimens was performed with 600, 1000 and 1500 mW/cm<sup>2</sup> light intensity and an irradiation time of 20, 40 and 60 s. Vickers microhardness on the top and bottom surfaces of samples was measured. Optimization was carried out via regression analysis using QStatLab software. Photopolymerization process parameters were calculated using a specially designed MatLab software-based algorithm. For all composites, regression models for hardness on top and bottom surfaces of composite layer were established. Layer thickness as well as hardness on top and bottom surfaces of each composite was calculated for 21 curing modes varying with light intensity and irradiation time. It was established that photopolymerization guidelines only of FC manufacturer guarantee the required hardness, while recommended regimes for UC and BC did not satisfy this requirement. Tables, containing recommended light curing regimes, were developed for three composite types, guaranteeing high hardness of composite restoration. They were designed to facilitate work of dentists in dental offices.https://www.mdpi.com/2227-9717/9/5/779light-cured compositesphotopolymerization processmicrohardnessoptimizationregression analysis |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tsanka Dikova Jordan Maximov Vladimir Todorov Georgi Georgiev Vladimir Panov |
spellingShingle |
Tsanka Dikova Jordan Maximov Vladimir Todorov Georgi Georgiev Vladimir Panov Optimization of Photopolymerization Process of Dental Composites Processes light-cured composites photopolymerization process microhardness optimization regression analysis |
author_facet |
Tsanka Dikova Jordan Maximov Vladimir Todorov Georgi Georgiev Vladimir Panov |
author_sort |
Tsanka Dikova |
title |
Optimization of Photopolymerization Process of Dental Composites |
title_short |
Optimization of Photopolymerization Process of Dental Composites |
title_full |
Optimization of Photopolymerization Process of Dental Composites |
title_fullStr |
Optimization of Photopolymerization Process of Dental Composites |
title_full_unstemmed |
Optimization of Photopolymerization Process of Dental Composites |
title_sort |
optimization of photopolymerization process of dental composites |
publisher |
MDPI AG |
series |
Processes |
issn |
2227-9717 |
publishDate |
2021-04-01 |
description |
The aim of this paper is to perform optimization of photopolymerization process of dental composites in order to obtain maximum hardness. Samples (5 mm diameter; 2, 3 and 4 mm thickness) were made of Universal Composite (UC), Bulk fill Composite (BC) and Flowable Composite (FC). Light curing of specimens was performed with 600, 1000 and 1500 mW/cm<sup>2</sup> light intensity and an irradiation time of 20, 40 and 60 s. Vickers microhardness on the top and bottom surfaces of samples was measured. Optimization was carried out via regression analysis using QStatLab software. Photopolymerization process parameters were calculated using a specially designed MatLab software-based algorithm. For all composites, regression models for hardness on top and bottom surfaces of composite layer were established. Layer thickness as well as hardness on top and bottom surfaces of each composite was calculated for 21 curing modes varying with light intensity and irradiation time. It was established that photopolymerization guidelines only of FC manufacturer guarantee the required hardness, while recommended regimes for UC and BC did not satisfy this requirement. Tables, containing recommended light curing regimes, were developed for three composite types, guaranteeing high hardness of composite restoration. They were designed to facilitate work of dentists in dental offices. |
topic |
light-cured composites photopolymerization process microhardness optimization regression analysis |
url |
https://www.mdpi.com/2227-9717/9/5/779 |
work_keys_str_mv |
AT tsankadikova optimizationofphotopolymerizationprocessofdentalcomposites AT jordanmaximov optimizationofphotopolymerizationprocessofdentalcomposites AT vladimirtodorov optimizationofphotopolymerizationprocessofdentalcomposites AT georgigeorgiev optimizationofphotopolymerizationprocessofdentalcomposites AT vladimirpanov optimizationofphotopolymerizationprocessofdentalcomposites |
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