Influence of Different Pigmentations and Accelerated Aging on the Hardness and Tear Strength of the A-2186 and MDX4-4210 Silicones
Joint Authors
Bannwart, Lisiane Cristina
Marrega Malavazi, Estefânia
dos Santos, Daniela Micheline
de Moraes Melo Neto, Clóvis Lamartine
Pereira de Caxias, Fernanda
Freitas da Silva, Emily Vivianne
Pesqueira, Aldiéris Alves
de Melo Moreno, André Luiz
de Magalhães Bertoz, André Pinheiro
Goiato, Marcelo Coelho
Source
International Journal of Dentistry
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-08-20
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
Objective.
To evaluate the influence of different pigmentations and accelerated aging on the hardness and tear strength of the A-2186 and MDX4-4210 silicones.
Materials and Methods.
The samples A-2186 and MDX4-4210 were manufactured without and with pigmentations (black, bronze, and pink).
For the Shore A hardness test, 80 samples of each silicone were fabricated, and for the tear strength test, 320 samples of each silicone were fabricated.
Eight groups were created for each test (n = 10).
These tests were performed before and after 252, 504, and 1008 hours of aging.
Three-way repeated-measures analysis of variance and the Tukey test were performed (α = 0.05).
Results.
The A-2186 silicone showed higher hardness and tear strength when compared with the MDX4-4210 silicone p<0.05, except in the hardness of the A-2186 and MDX4-4210 groups without pigmentation after 1008 hours p>0.05.
All hardness values were between 25 and 35 units, regardless of the silicone type, period, and pigmentation (or no pigmentation).
In most situations, the hardness of silicones used increased after 252 hours p<0.05.
The nonpigmented MDX4-4210 group and all A-2186 groups showed an increase in tear strength after 252 hours p<0.05.
For the nonpigmented MDX4-4210 group, from 252 to 1008 hours, there was no change in tear strength p>0.05.
All pigmented MDX4-4210 groups showed no change in tear strength from 0 (initial) to 1008 hours of aging p>0.05.
In all A-2186 groups, from 252 to 504 hours, there was a reduction in tear strength p<0.05, and from 504 to 1008 hours, there was an increase in tear strength p<0.05, except in the bronze A-2186 group p>0.05.
Conclusion.
In most situations, the A-2186 silicone showed significantly higher values of hardness and tear strength than the MDX4-4210 silicone.
All hardness values were considered clinically acceptable.
Accelerated aging could increase, decrease, or not significantly change the hardness and tear strength of the silicones used.
The results of hardness and tear strength suggest that MDX4-4210 was more influenced by the presence of pigmentation after aging.
American Psychological Association (APA)
Marrega Malavazi, Estefânia& dos Santos, Daniela Micheline& de Moraes Melo Neto, Clóvis Lamartine& Pereira de Caxias, Fernanda& Freitas da Silva, Emily Vivianne& Bannwart, Lisiane Cristina…[et al.]. 2020. Influence of Different Pigmentations and Accelerated Aging on the Hardness and Tear Strength of the A-2186 and MDX4-4210 Silicones. International Journal of Dentistry،Vol. 2020, no. 2020, pp.1-9.
https://search.emarefa.net/detail/BIM-1169659
Modern Language Association (MLA)
Marrega Malavazi, Estefânia…[et al.]. Influence of Different Pigmentations and Accelerated Aging on the Hardness and Tear Strength of the A-2186 and MDX4-4210 Silicones. International Journal of Dentistry No. 2020 (2020), pp.1-9.
https://search.emarefa.net/detail/BIM-1169659
American Medical Association (AMA)
Marrega Malavazi, Estefânia& dos Santos, Daniela Micheline& de Moraes Melo Neto, Clóvis Lamartine& Pereira de Caxias, Fernanda& Freitas da Silva, Emily Vivianne& Bannwart, Lisiane Cristina…[et al.]. Influence of Different Pigmentations and Accelerated Aging on the Hardness and Tear Strength of the A-2186 and MDX4-4210 Silicones. International Journal of Dentistry. 2020. Vol. 2020, no. 2020, pp.1-9.
https://search.emarefa.net/detail/BIM-1169659
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1169659