• Title/Summary/Keyword: Hydrophilic rubber impression material

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EFFECT ON IMMERSI0N DISINFECTION OF HYDROPHIILIC RUBBER IMPRESSI0N MATERIAL ON DIMENSIONAL STABILITY AND SURFACE HARDNESS OF IMPROVED STONE CAST (친수성 고무인상재의 침적 소독이 경석모형의 크기의 안정성과 표면경도에 미치는 영향)

  • Nam, Mee-Hyun;Kang, Woo-Jin;Chung, Moon-Kyu
    • The Journal of Korean Academy of Prosthodontics
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    • v.33 no.3
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    • pp.569-583
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    • 1995
  • Disinfection of dental impressions are necessary due to contamination with patient’s saliva and blood, which is a potential for cross-infection. The purpose of this study was to evaluate the effects of disinfection of four hydrophilic rubber impression materials with three disinfecting solutions, on the dimensional stability and surface hardness of improved stone casts. Three hydrophilic vinyl polysiloxane impression materials(Express, Reprosil, Exafine) and one polyether impression material(Impregum-F) were mixed according to the manufacturer’s directions and impressions were made on a ADA specification No. 19 stainless-steeldie. On removal of the impressions, each impression was immersed in one of the disinfectants(Banicide, Potadine, Clorox) for 10 minutes. After disinfection, type IV improved stone. casts were poured. On this cast, the linear dimension and surface hardness were measuredusing a Measurescope(Nikon, Japan) and a Barcol hardness tester(Barber, Colman Co U. S. A). The results were as follows : 1. The improved stone casts from disinfected Reprosil and Impregum-F impression material did not show dimensional changes(P>0.01). Those from disinfected Express and Exafine impression material showed dimensional changes(P<0.01). The amount of shrinkage was not clinically significant. 2. The improved stone casts from disinfected Express impression material did not exhibit changes in surface hardness(P>0.01), but those from disinfected Reprosil, Exafine, Imp regnum-F impression material showed changes in surface hardness(P<0.01). 3. The dimensinal stability and surface hardness of the improved stone casts were satisfactory using Banicide on Express, all disinfectants used in this study on Reprosil, Potadin and Clorox on Exafine, Banicide and Clorox on Impregum-F. According to these results, immersion disinfection of hydrophilic rubber impression mate rials did not adversely affect the resultant casts. Nevertheless compatibility tests of impression materials and disinfectants should be done when disinfecting impressions.

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Effect of Filler on the Physical Properties of Silicone Rubber Impression Material (실리콘 고무인상재의 물성에 미치는 충전제의 영향)

  • Chung, Kyung-Ho;Kang, Seung-Kyung
    • Elastomers and Composites
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    • v.41 no.3
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    • pp.157-163
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    • 2006
  • In this study, the wettability and mechanical properties of silicone rubber impression material were studied by using precipitated silica and fumed silica with different particle size and polarity (hydrophilic/hydrophobic). Curing time of impression material depended on the particle size of fumed silica. The curing time delayed about 9 minutes by using A300, which was the fumed silica with the smallest particle size among the silica used in this study. Wettability of rubber impression material improved with the introduction oi hydrophobic fumed silica(R972). Also, the optimum flow and mechanical properties could be obtained by using blended silica with the 90: 10 ratio of precipitated and fumed silica.

Fundamental Study for Developing Silicone Rubber Impression Material (실리콘 고무인상재 개발을 위한 기초연구)

  • Oh, Young-Il;Han, Kyung-A;Kim, Kyung-Nam;Cho, Lee-Ra;Chung, Kyung-Ho
    • Elastomers and Composites
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    • v.35 no.1
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    • pp.19-28
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    • 2000
  • The fundamental study of additional silicone impression material has been performed by comparing the other import products. In order to estimate the possibility of usage of the impression material developed in this study, the several techniques such as IR, EDX, DSC, TGA, rubber rheometer, and contact angle measurement were used. According to the results, there were not any product satisfying all properties required in the impression material. The impression material developed in this study showed best mechanical properties among the all impression materials. However. the wetting property should be studied more by an introduction of a hydrophilic surfactant or modification of a base polymer.

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Application of Various Types of Surfactants for Improving Hydrophilic Properties of Polyvinylsiloxane Dental Rubber Impression Materials and its Effects on Physical Properties (폴리비닐실록산 치과용 고무인상재의 친수성 향상을 위한 계면활성제의 응용과 물성에 미치 는 영향)

  • Park, Yeong-Joon;Hwang, Moon-Jin;Kim, Min-Kang;Song, Ho-Jun;Ha, Kwang;Kang, Shin-Young
    • Elastomers and Composites
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    • v.43 no.2
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    • pp.88-103
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    • 2008
  • This study was purposed to investigate the effects of surfactants and fillers on physical properties of hydrophilic polyvinylsiloxane dental impression materials (PVS). Incorporation of surfactants enhanced the hydrophilicity of the PVS, however, it induced increased viscosity and permanent deformation ratio, delayed setting, and decreased tensile strength. At high concentrations of surfactant, the tensile strength was observed to decrease significantly due to the internal pore formation. Especially, the hydrophilicity of the PVS was significantly enhanced with the addition of Silwet L-77. However, the viscosity, strain in compression, pore formation, and setting time increased whereas the elastic recovery rate and strength remarkably decreased. The PVS dental materials containing Span 20 showed the lowest degree of viscosity increase, delayed setting, pore formation, and hydrophilicity. The delayed setting, pore formation, and strength decrease caused by the incorporation of surfactant were improved by substituting the crystalline quartz filler with diatomaceous earth while the contact angle of PVS dental materials increased.