Effect of extraoral aging conditions on the color stability of high temperature vulcanizing and room temperature vulcanizing maxillofacial silicone elastomers: An in vitro study

Kanakaraj, Sariga; K, Harsha Kumar; Ravichandran, R; Nair, Vivek V; Janardhanan, Kavitha; VS, Dr. Deepthi

doi:10.22271/oral.2022.v8.i2h.1558

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“…However, this method does not perfectly replicate the actual conditions faced by patients. The rapid aging process in the chamber can alter the degradation mechanism of the polymer, resulting in imprecise assessments of its color stability [57,58].…”

Section: Aging Conditionsmentioning

confidence: 99%

Evaluation of the Mechanical and Physical Properties of Maxillofacial Silicone Type A-2186 Impregnated with a Hybrid Chitosan–TiO2 Nanocomposite Subjected to Different Accelerated Aging Conditions

Al-Kadi,

Adbulkareem,

Azhdar

2023

Biomimetics

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The effects of incorporating a pioneer chitosan–TiO2 nanocomposite on the mechanical and physical properties of room-temperature vulcanization (RTV) maxillofacial A-2186 silicone under accelerated aging protocols were rigorously examined. This investigation utilized 450 samples distributed across five distinct silicone classifications and assessed their attributes, such as tensile strength, elongation, tear strength, hardness, and surface roughness, before and after various accelerated aging processes. Statistical methodologies, including a one-way ANOVA, Tukey’s HSD, and Dunnett’s T3, were employed based on the homogeneity of variance, and several key results were obtained. Silicones infused with 1 wt.% chitosan–TiO2 showed enhanced tensile strength across various aging procedures. Moreover, the 1 wt.% TiO2/Chitosan noncombination (TC) and 2 wt.% TiO2 compositions exhibited pronounced improvements in the elongation percentage. A consistent rise was evident across all silicone categories regarding tear strength, with the 1 wt.% chitosan–TiO2 variant being prominent under certain conditions. Variations in hardness were observed, with the 1 wt.% TC and 3 wt.% chitosan samples showing distinctive responses to certain conditions. Although most samples displayed a decreased surface roughness upon aging, the 1 wt.% chitosan–TiO2 variant frequently countered this trend. This investigation provides insights into the potential of the chitosan–TiO2 nanocomposite to influence silicone properties under aging conditions.

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Section: Aging Conditionsmentioning

confidence: 99%