Other

Kabushikikaisha Shofu

Toshiyuki Nakatuka

Taiji Horita

Ippei Matsumoto

Katsuya Kimoto

Noriyuki Negoro

Mitsuharu Mizuno

Yasuhisa Yasuda

A plunger for being inserted in a tubular barrel in an axially movable manner includes a plunger body having a distal end positioned within the barrel and a proximal end positioned outside of the barrel, and a seal member disposed on the distal end of the plunger body. The seal member has a base portion extending from the plunger body towards the distal end of the barrel, and a flange portion radially outwardly extending from the base portion and having a peripheral edge contacting an inner circumference of the barrel so as to define an accommodation space within the barrel. The flange portion is elastically deformed to be brought into an elastically deformed state by means of reaction force from a material accommodated within the accommodation space when the seal member is slid towards the distal end of the barrel by means of pressing force applied onto the plunger body so as to force the material out of the accommodation space, and presses the plunger body back towards the proximal end of the barrel by means of self-restoring force of the flange portion when the pressing force is released from the plunger body.

Injector assembly capable of preventing subsequent dripping, as well as plunger and seal member for the injector assembly

There are provided an inorganic filler, multi-functional filler, an organic compound filler, a modified filler, and a dental coloring filler suitable in use as a filler in a dental composition, compositions having a resin matrix of an organic polymer material, as well as a process for producing the same. Disclosed are an inorganic filler which comprises an inorganic fine particle, wherein the surface of the inorganic fine particle is covered with polysiloxane. Also disclosed is a multi-functional filler which comprises an inorganic fine particle containing an acid reactive element, wherein a cement reactive phase is formed on the surface of the inorganic fine particle, and the cement reactive phase is further covered with polysiloxane. Also disclosed is an organic compound filler which comprises an organic-inorganic polymer particle or an organic polymer particle, wherein the surface of the organic-inorganic polymer particle or an organic polymer particle is covered with an inorganic film. Also, disclosed is a modified filler which comprises an inorganic fine particle, wherein the surface of the inorganic fine particle is covered with polyorganosiloxane. Also disclosed is a dental col ring filler, which comprises an inorganic particle and a coloring particle, wherein the inorganic particle and the coloring particle are unifoy mixed and dispersed, the surfaces of these particles are covered with poly(organo)siloxane. Further disclosed are dental compositions containing above fillers, and processes for producing above fillers.

Dental fillers

Growing community of inventors

Kyoto, Japan

Toshiyuki Nakatuka