不同色素沉着和加速老化对A - 2186和MDX4 - 4210硅酮硬度及撕裂强度的影响
Influence of Different Pigmentations and Accelerated Aging on the Hardness and Tear Strength of the A-2186 and MDX4-4210 Silicones.
作者信息
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, Pesqueira Aldiéris Alves, de Melo Moreno André Luiz, de Magalhães Bertoz André Pinheiro, Goiato Marcelo Coelho
机构信息
Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), School of Dentistry, Aracatuba, São Paulo, Brazil.
Oral Oncology Center, São Paulo State University (UNESP), School of Dentistry, Araçatuba, São Paulo, Brazil.
出版信息
Int J Dent. 2020 Aug 20;2020:8492091. doi: 10.1155/2020/8492091. eCollection 2020.
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 ( = 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 ( = 0.05).
RESULTS
The A-2186 silicone showed higher hardness and tear strength when compared with the MDX4-4210 silicone ( < 0.05), except in the hardness of the A-2186 and MDX4-4210 groups without pigmentation after 1008 hours ( > 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 ( < 0.05). The nonpigmented MDX4-4210 group and all A-2186 groups showed an increase in tear strength after 252 hours ( < 0.05). For the nonpigmented MDX4-4210 group, from 252 to 1008 hours, there was no change in tear strength ( > 0.05). All pigmented MDX4-4210 groups showed no change in tear strength from 0 (initial) to 1008 hours of aging ( > 0.05). In all A-2186 groups, from 252 to 504 hours, there was a reduction in tear strength ( < 0.05), and from 504 to 1008 hours, there was an increase in tear strength ( < 0.05), except in the bronze A-2186 group ( > 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.
目的
评估不同色素沉着和加速老化对A - 2186和MDX4 - 4210硅酮硬度和撕裂强度的影响。
材料与方法
制备了无色素沉着以及有色素沉着（黑色、青铜色和粉色）的A - 2186和MDX4 - 4210样品。对于邵氏A硬度测试，每种硅酮制备80个样品，对于撕裂强度测试，每种硅酮制备320个样品。每次测试创建八组（每组 = 10）。这些测试在老化252、504和1008小时之前和之后进行。进行了三因素重复测量方差分析和Tukey检验（ = 0.05）。
结果
与MDX4 - 4210硅酮相比，A - 2186硅酮显示出更高 的硬度和撕裂强度（ < 0.05），1008小时后无色素沉着的A - 2186和MDX4 - 4210组的硬度情况除外（ > 0.05）。无论硅酮类型、时间段和色素沉着情况（或无色素沉着）如何，所有硬度值都在25至35单位之间。在大多数情况下，使用的硅酮硬度在252小时后增加（ < 0.05）。无色素沉着的MDX4 - 4210组和所有A - 2186组在252小时后撕裂强度增加（ < 0.05）。对于无色素沉着的MDX4 - 4210组，从252小时到1008小时，撕裂强度没有变化（ > 0.05）。所有有色素沉着的MDX4 - 4210组在从0（初始）到1008小时老化过程中撕裂强度没有变化（ > 0.05）。在所有A - 2186组中，从252小时到504小时，撕裂强度降低（ < 0.05），从504小时到1008小时，撕裂强度增加（ < 0.05），青铜色A - 2186组除外（ > 0.05）。
结论
在大多数情况下，A - 2186硅酮显示出比MDX4 - 4210硅酮显著更高的硬度和撕裂强度值。所有硬度值在临床上都被认为是可接受的。加速老化可能会增加、降低或不会显著改变所用硅酮的硬度和撕裂强度。硬度和撕裂强度的结果表明，MDX4 - 4210在老化后受色素沉着的影响更大。
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