Properties of Magnetically Attractive Experimental Resin Composites

Abstract

SUS444 stainless steel filled chemically cured resin composites that can attract magnet were fabricated. The filler was treated with various concentrations of silane. The experimental composite was easy to handle and showed a good shelf life. The maximal properties obtained are as follows; The attraction force to a magnetic attachment was 1/3-1/4 lower than the commercially available magnet-keeper system for dental magnetic attachment. Flexural strength and Knoop hardness of the composite were 76MPa (7.7kgf/ mm2) and 64KHN. These values were lower than the commercially available chemically cured composite used as a reference. Eluted metal from the composite in 1% lactic acid solution for 7 days showed 0.7mg/ cm2, but in 0.9% NaCl solution for 7 days, it could not be detected.

Setting and Flexural Properties of Metal-Resin Composite Using Ag-Cu Particles as Filler and Chemical Accelerator

“…Fig. 6 shows the iso-value curves of the elastic modulus with the changes in 4-META concentration and metal particle content, which was drawn using the equation (2). As shown in Fig.…”

Development of Metal-resin Composite for Dental Magnet Keepers. Part 1: Effects of Filler and 4-META Contents on Setting and Flexural Properties

“…Endo et al 4) also reported that the breakdown potential of ferric stainless steels increased and the total amount of released metal ions decreased linearly with increase in the sum of Cr and Mo contents. As for experimental magnetic resin composites, immersion tests have been conducted by Hirano et al using SUS444 (18 Cr, 2 Mo) 7) and SUS446 (26.7 Cr, 0 Mo) 9) fillers. The sums of the Cr and Mo contents of SUS444 and SUS446 were 20 and 26.7 , respectively, and the amount of eluted metals from the resin composite containing SUS446 was reported to be less than that from the resin composite containing SUS444 9) .…”

“…As for the obtained elastic moduli, they were equal to or higher than those of commercial hybrid composite resins 20) . Although the attraction force between the experimental soft magnetic resin composites and a commercial hard magnet was not measured because of the difficulty in applying the method described in a report 7) , specimens for the flexural test were attracted very well by a commercial hard magnet. Based on this observation, it could be said that this soft magnetic resin composite was thought to be promising in terms of magnetic attractive force.…”

“…Apart from the corrosion liability drawback, Hirano et al 7) mentioned that incorporating the keeper in a root cap during casting is an intricate process too. Therefore, if strong and tough magnetic resin composite were to be developed, the root cap that can attract a magnet could be prepared in the oral cavity using the magnetic resin composite, thereby eliminating all the abovementioned disadvantages.…”

“…Therefore, if strong and tough magnetic resin composite were to be developed, the root cap that can attract a magnet could be prepared in the oral cavity using the magnetic resin composite, thereby eliminating all the abovementioned disadvantages. In pursuit of this magnetic resin composite, Hirano et al produced several valuable reports based on studies on resin composites that could attract magnets [7][8][9] . The properties of these experimental composites were fairly good.…”