Effects of environmental factors on maxillofacial elastomers: Part III—Physical properties

Haug, Steven P.; Andres, Carl J.; Muñoz, Carlos; Okamura, Mitsunobu

doi:10.1016/0022-3913(92)90381-j

Cited by 52 publications

(45 citation statements)

References 9 publications

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“…Consequently the MTT method is considered as a sensitive index to evaluate the cytotoxicity of dental materials 27–29. In the present study, the cytotoxicity of maxillofacial silicone elastomers was assessed by MTT assay, which is a well‐established method for dental material testing 30–32…”

Section: Discussionmentioning

confidence: 97%

In vitro cytotoxicity of maxillofacial silicone elastomers: Effect of accelerated aging

et al. 2008

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The purpose of this in vitro study was to evaluate the cytotoxicity of three maxillofacial silicone elastomers at 24, 48, and 72 h on L-929 cells and to determine the effect of accelerated aging on the cytotoxicity of these silicone elastomers. Disc-shaped test samples of maxillofacial silicone elastomers (Cosmesil, Episil, Multisil) were fabricated according to manufacturers' instructions under aseptic conditions. Samples were then divided into three groups: (1) not aged; (2) aged for 150 h with an accelerated weathering tester; and (3) aged for 300 h. Then the samples were placed in Dulbecco's Modified Eagle Medium/Ham's F12 (DMEM/F12) for 24, 48, and 72 h. After the incubation periods, cytotoxicity of the extracts to cultured fibroblasts (L-929) was measured by MTT assay. The degree of cytotoxicity of each sample was determined according to the reference value represented by the cells with a control (culture without sample). Statistical significance was determined by repeated measurement ANOVA (p < 0.01) followed by Duncan's test (p < 0.05). All test materials in each group demonstrated high survival rates in MTT assay (Episil; 93.84%, Multisil; 88.30%, Cosmesil; 87.50%, respectively); however, in all groups, Episil material demonstrated significantly higher cell survival rate after each of the experimental incubation periods (p < 0.05). Accelerated aging for 150 and 300 h had no significant effect on the biocompatibility of maxillofacial silicone elastomers tested (p > 0.05).

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Section: Discussionmentioning

confidence: 97%

In vitro cytotoxicity of maxillofacial silicone elastomers: Effect of accelerated aging

et al. 2008

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“…In this study, specimens were subjected to different aging intervals (200, 400, and 600 hours) to simulate prostheses being in service for a period of 7 to 20 months, as patients wear their prostheses for an average of 8 to 12 hours per day. This timeframe was selected because it is consistent with the literature on average service periods for silicone prostheses, which depend on patients’ habits, climate, and environmental conditions 20,21,24,30 …”

Section: Discussionmentioning

confidence: 99%

“…Such changes caused the silicone specimens to be less elastic when pulling the fibers out of them, so that the bond strength with the glass fibers was weakened and decreased in value. Aging for 600 hours greatly weakened the interfacial strengths with the embedded fibers, suggesting that longer durations of aging adversely affected silicones and altered their properties to a greater extent 24,33 …”

Section: Discussionmentioning

confidence: 99%

Effects of Accelerated Artificial Daylight Aging on Bending Strength and Bonding of Glass Fibers in Fiber‐Embedded Maxillofacial Silicone Prostheses

Hatamleh

Watts

2010

Journal of Prosthodontics

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“…9 Environmental conditions can induce significant changes in the extension of cross-linking, strongly affecting the physical and mechanical properties of polymers. 10 Sunlight, temperature, moisture, wind, dust, and pollutants are the main climate factors negatively affecting the mechanical stability and causing degradation. 11,12 More precisely, deterioration has been reported to be a photo-oxidative attack that is the combined action of oxygen and sunlight on their chemical structure.…”

mentioning

confidence: 99%

Dynamic Mechanical Properties of a Maxillofacial Silicone Elastomer Incorporating a ZnO Additive

Mouzakis

Papadopoulos²,

Polyzois³

et al. 2010

Journal of Craniofacial Surgery

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The main objective of the current study was to investigate the dynamic mechanical properties of a room-temperature vulcanizing silicone incorporating different fractions of zinc oxide (ZnO) after indoor and outdoor photoaging. Forty-eight samples were produced by adding different amounts of ZnO into a commercial maxillofacial silicone (EPISIL-E). The samples were divided into 4 groups containing 0.0, 0.2, 0.5, and 1 wt% ZnO additive, respectively. Samples were exposed to sunlight (subgroup 2), ultraviolet (subgroup 3), and fluorescence (subgroup 4) aging, whereas nonaged samples comprised the control subgroup (subgroup 1). Dynamic mechanical analysis was used to determine the storage modulus (E'), loss modulus (E″), and damping capacity (tanδ). General linear statistic model was conducted to evaluate the effects of aging, testing frequency, and composition on the dynamic mechanical properties of the silicone with the ZnO additive. Post hoc analysis was performed using Tukey test. Statistical analysis revealed a significant impact of composition on tanδ (P < 0.05). Aging influenced E' and E″ (P < 0.01). The combination of aging and composition had a significant effect on all dynamic properties (P < 0.01).

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Effects of environmental factors on maxillofacial elastomers: Part III—Physical properties

Cited by 52 publications

References 9 publications

In vitro cytotoxicity of maxillofacial silicone elastomers: Effect of accelerated aging

In vitro cytotoxicity of maxillofacial silicone elastomers: Effect of accelerated aging

Effects of Accelerated Artificial Daylight Aging on Bending Strength and Bonding of Glass Fibers in Fiber‐Embedded Maxillofacial Silicone Prostheses

Dynamic Mechanical Properties of a Maxillofacial Silicone Elastomer Incorporating a ZnO Additive

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