Publication: Effect of opacifier and pigments on hardness of maxillofacial silicones.
Issued Date
2015-09
Resource Type
Language
eng
ISSN
0125-5614 (printed)
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Mahidol University
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Mahidol University
Bibliographic Citation
Mirchandani B, Wonglamsam A, Tancharoen S, Srithavaj T. Effect of opacifier and pigments on hardness of maxillofacial silicones. M Dent J 2015; 35(3): 231-5.
Suggested Citation
Mirchandani, Bharat, Amornrat Wonglamsam, อมรรัตน์ วงค์ล่ำซำ, Salunya Tancharoen, ศรัญญา ตันเจริญ, Theerathavaj Srithavaj, ธีรธวัช ศรีธวัช Effect of opacifier and pigments on hardness of maxillofacial silicones.. Mirchandani B, Wonglamsam A, Tancharoen S, Srithavaj T. Effect of opacifier and pigments on hardness of maxillofacial silicones. M Dent J 2015; 35(3): 231-5.. Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/1014
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Title
Effect of opacifier and pigments on hardness of maxillofacial silicones.
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Abstract
Objective: This study aimed to investigate the effects of an opacifier on the Shore A hardness of two pigmented maxillofacial silicones. Materials and Methods: Two commonly used maxillofacial silicones; VST-50 and LSR-05 were pigmented with 0.2% w/w yellow silicone intrinsic pigment. Kaolin powder calcined, an opacifier, was combined with the pigmented silicone in different percentage weight. Fifty-six square-shaped specimens (n=7) were divided into 6 groups, in addition to control groups, for each silicone. Each silicone was divided into three groups (0%, 5%, 10%) according to the weight of opacifier. The hardness of the specimens was investigated using a Shore A durometer. A 1-way ANOVA and Tukey’s HSD post-hoc test were performed for the Shore A hardness of VST-50 and LSR-05 at α=.05. Results: The mean Shore A hardness of VST-50 for control, 0%, 5%, and 10% groups were 32.03± 0.89, 31.22± 1.91, 30.13 ± 1.72and 27.01 ± 1.52 respectively. For LSR-05, the mean Shore A hardness were 12.97 ± 1.11, 13.03 ± 0.98, 13.14 ± 0.87 and 11.30 ± 1.11 for control, 0%, 5% and 10% groups respectively. For VST-50 and LSR-05, values of Shore A hardness were the lowest for the 10% group. The Shore A hardness decreased significantly (α =0.05) for the 10% opacifier group compared to other groups. Conclusions: LSR-05 had lower Shore A hardness than VST-50 in all groups. An addition of 10% weight of opacifier caused a significant difference on Shore A hardness of VST-50 and LSR-05 silicones.