Kabushiki Kaisha Toshiba

Toyo Chemical Laboratories, Inc.

Mitsuru Otani

Takashi Yano

Mitsuru Sugawara

Sadao Tanikoshi

Masayuki Takami

Kazuhiko Ide

Katsumi Kusama

Kyosuke Dobashi

Mototaka Kitajima

Tsutomu Kameda

Mutsuo Fujisawa

Haruhiro Ohtsu

Optical signals inputted to input ports are split in half by 1&#xd7;2 optical splitters respectively and the resulting signals are inputted to the input terminals of an optical matrix switch. The optical matrix switch switches between the routes of the individual optical signals and outputs the signal at any of the output ports. This enables the optical signal from the same input port to be outputted at two different output ports, which makes it possible to effect 'bridge' at the time of protection switching.

Optical switching apparatus and optical transmission apparatus

The invention is directed to a compounded thermoplasticized gutta percha or balata and isoprene polymer resin, for filling a dental root canal in an efficient and convenient manner, and a method for preparing the same. The compounded resin includes gutta percha or balata and isoprene polymer and compounding materials including paraffin wax, adapted to compound the gutta percha or balata and isoprene polymer such that they plasticize at a relatively low temperature in the range of 40.degree. C. to 60.degree. C. The use of gutta percha or balata and isoprene polymer, and the relatively low plasticizing temperature, enable the compounded resin to be injected into a prepared dental root canal for filling thereof in an efficient and convenient manner. The method for preparing the compounded resin includes combining, heating and mixing gutta percha or balata and isoprene polymer and the compounding materials to a relatively low temperature in the range of 40.degree. C. to 60.degree. C., at which temperature the compounded materials plasticize, to form the compounded resin.

Compounded thermoplasticized isoprene polymer resin for filling a dental

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Tokyo, Japan

Mitsuru Otani