Journal of Prosthetic Dentistry

Effect of ultraviolet-protective 2-ethylhexyl salicylate incorporation on the mechanical properties of different maxillofacial silicone elastomers


      Statement of problem

      Whether the incorporation of ultraviolet-protective 2-ethylhexyl salicylate (UV-ES) affects the mechanical properties of different maxillofacial silicone elastomers, limiting the service life of facial prostheses, is unclear.


      The purpose of this in vitro study was to examine the mechanical properties of different maxillofacial silicone elastomers incorporating different ratios of UV-ES.

      Material and methods

      Three different ratios of UV-ES were incorporated into 3 different types of maxillofacial silicones (M511, TechSil-25, and A-2000), and the mechanical properties of the silicones were investigated. Silicone pigments were added to each silicone type to mimic skin color. Dumbbell-shaped specimens were fabricated for tensile strength, percentage elongation, and hardness measurements, and trouser-shaped specimens for tear strength measurement. A total of 240 specimens were prepared. UV-ES in 3 different ratios (1%, 2%, and 5%) and a control group of each silicone type were generated (n=10). The effects of maxillofacial silicone type and ultraviolet protective ratios on hardness, tensile strength, percentage elongation, and tear strength were examined by factorial ANOVA (α=.05).


      The Shore-A hardness in the control and UV-ES added groups was not significantly different in M511 material (P>.05), and a statistically significant decrease was observed in all ratios in TechSil S-25 and A-2000 silicones (P<.05). After adding 1%, 2%, and 5% UV protective into the silicones, the tensile strength and elongation of TechSil S-25 silicone material decreased significantly (P<.05), while these mechanical properties of M511 and A-2000 were not affected by UV-ES addition (P>.05). Tensile and tear strength values of the silicone elastomers were highest for TechSil S-25.


      The mechanical properties of M511 and A-2000 silicone elastomers were not adversely affected by the addition of 1%, 2%, or 5% UV-ES.
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        • Hatamleh M.M.
        • Watts D.C.
        Mechanical properties and bonding of maxillofacial silicone elastomers.
        Dent Mater. 2010; 26: 185-191
        • Goiato M.C.
        • Pesqueira A.A.
        • da Silva C.R.
        • Gennari Filho H.
        • Dos Santos D.M.
        Patient satisfaction with maxillofacial prosthesis. Literature review.
        Plast Reconstr Aesthet Surg. 2009; 62: 175-180
        • Karakoca S.
        • Aydin C.
        • Yilmaz H.
        • Bal B.T.
        Retrospective study of treatment outcomes with implant-retained extraoral prostheses: survival rates and prosthetic complications.
        J Prosthet Dent. 2010; 103: 118-126
        • Bates M.T.
        • Chow J.K.
        • Powers J.M.
        • Kiat-Amnuay S.
        Color stability and mechanical properties of two commonly used silicone elastomers with e-skin and reality coloring systems.
        Int J Prosthodont. 2021; 34: 204-211
        • Han Y.
        • Zhao Y.
        • Xie C.
        • Powers J.M.
        • Kiat-amnuay S.
        Color stability of pigmented maxillofacial silicone elastomer: effects of nano-oxides as opacifiers.
        J Dent. 2010; 38: e100-e105
        • Kheur M.
        • Sethi T.
        • Coward T.
        • Kakade D.
        • Rajkumar M.
        Evaluation of the effect of ultraviolet stabilizers on the change in color of pigmented silicone elastomer: an in vitro study.
        J Indian Prosthodont Soc. 2016; 16: 276-281
        • Eleni P.N.
        • Krokida M.K.
        • Polyzois G.L.
        • Gettleman L.
        Effect of different disinfecting procedures on the hardness and color stability of two maxillofacial elastomers over time.
        J Appl Oral Sci. 2013; 21: 278-283
        • Nguyen C.T.
        • Chambers M.S.
        • Powers J.M.
        • Kiat-Amnuay S.
        Effect of opacifiers and UV absorbers on pigmented maxillofacial silicone elastomer, part 2: mechanical properties after artificial aging.
        J Prosthet Dent. 2013; 109: 402-410
        • Güngör M.B.
        • Nemli S.K.
        • Bal B.T.
        • Arıcı Y.K.
        Effect of ultraviolet protective agents on maxillofacial silicone elastomer, part 2: Mechanical properties after artificial aging.
        J Prosthet Dent. 2 Auguest 2021; ([Epub ahead of print.])
        • Meszároš O.
        • Schmidt P.
        • Pospíšil J.
        • Nešpůrek S.
        Photooxidation of poly [methyl (phenyl) silylene] and effect of photostabilizers.
        Polym Degrad Stab. 2006; 91: 573-578
        • Bal B.T.
        • Güngör M.B.
        • Nemli S.K.
        • Aydın C.
        • Arıcı Y.K.
        Effect of ultraviolet protective agents on maxillofacial silicone elastomer, part 1: color stability after artificial aging.
        J Prosthet Dent. July 2021; ([Epub ahead of print.])
        • Akash R.
        • Guttal S.S.
        Effect of incorporation of nano-oxides on color stability of maxillofacial silicone elastomer subjected to outdoor weathering.
        J Prosthodont. 2015; 24: 569-575
        • Han Y.
        • Kiat-amnuay S.
        • Powers J.M.
        • Zhao Y.
        Effect of nano-oxide concentration on the mechanical properties of a maxillofacial silicone elastomer.
        J Prosthet Dent. 2008; 100: 465-473
        • Huang S.-M.
        • Hung T.-H.
        • Liu Y.-C.
        • Kuo C.-H.
        • Shieh C.-J.
        Green synthesis of ultraviolet absorber 2-ethylhexyl salicylate: experimental design and artificial neural network modeling.
        Catalysts. 2017; 7: 342
        • ASTM International
        ASTM D412:2006. Standard test methods for vulcanized rubber and thermoplastic elastomers-tension.
        ASTM International, West Conshohocken2006: 1-5
        • ASTM International
        ASTM D624:2007. Standard test method for tear strength of conventional vulcanized rubber and thermoplastic elastomers.
        ASTM International, West Conshohocken2007: 1-3
        • ASTM International
        ASTM D2240-05:2010 Standard test method for rubber property - durometer hardness.
        ASTM International, West Conshohocken2010: 1-9