Shofu Inc.

Kabushikikaisha Shofu

Hideto Kasaba

Toshiyuki Nakatsuka

Katsuya Kimoto

Shunsuke Miyata

Yukihiro Ogawa

Daisuke Hara

Kenzo Yamamoto

Hiroyuki Kobayashi

Ryouji Takei

Tsukasa Sasaki

Hiroyuki Shioi

Hiroshi Yaana

Hisako Tokura

Yuji Sadakane

[Problem] To provide a dental photocurable composition which has sufficient mechanical property and whose rheological property is not deactivated even after long-term storage. [Solution] The dental photocurable composition of the present disclosure comprises (A) polymerizable monomer, (B) photosensitizer, (D) photopolymerization accelerator and (E) filler, wherein, the dental photocurable composition comprises (D1) aliphatic tertiary amine compound represented by formula (1) as the (D) photopolymerization accelerator, and the dental photocurable composition comprises (E1) hydrophobized silica fine particle having an average diameter of primary particle of 1 to 40 nm as the (E) filler. (wherein Rrepresents a substituent consisting of three or more carbons having an electron-withdrawing group at α-carbon and/or β-carbon of an amine starting from N, Rrepresents a substituent consisting of three or more carbons which may have an electron-withdrawing group, Rrepresents a substituent consisting of one or more carbons which may have an electron-withdrawing group, and α-carbon of N in the formula (1) is not an electron-withdrawing group.)

Dental photocurable composition excellent in operability and storage stability

[Problem] To provide a dental photocurable composition having sufficient mechanical property and being excellent in color tone selectivity because of having a small color difference between before curing and after curing. [Solution] To provide a dental photocurable composition, comprising (A) polymerizable monomer, (B) photosensitizer, (C) photoacid generator, (D) photopolymerization accelerator and (E) filler, wherein, the dental photocurable composition comprises (B-1) &#x3b1;-diketone compound as the (B) photosensitizer, and the dental photocurable composition comprises, with respect to 100 parts by mass of the (A) polymerizable monomer, 0.15 parts by mass or less of the (B-1) &#x3b1;-diketone compound, 0.5 parts by mass or more of the (C) photoacid generator, and 100 parts by mass or more of the (E) filler.

Dental photocurable composition excellent in color tone selectivity

An injector comprises a cylindrical barrel, a movable body housed in the barrel, and a plunger coming into separable contact with the movable body. The movable body includes a main body having an outer diameter smaller than an inner diameter of the barrel, a disk-shaped seal body disposed on the main body and including an outer circumferential end brought into close contact with an inner circumferential surface of the barrel, and at least one projecting portion projecting from the main body toward the inner circumferential surface of the barrel. A distance from a central axis of the movable body to a leading end of the at least one projecting portion is smaller than a half of an outer diameter of the seal body.

Injector capable of suppressing subsequent dripping of fluid

An injector comprises a cylindrical barrel including a discharge port, a seal body coming into close contact with an inner circumferential surface of the barrel, a plunger for pushing and moving the seal body to the discharge port side of the barrel, and a stopper disposed on one of the barrel and the plunger and coming into elastic contact with the other in a radial direction of the barrel.

Injector

To provide an organic-inorganic composite filler containing; a polymerizable monomer (a) having at least one functional group selected from the group consisting of &#x2014;OH group, &#x2014;NH&#x2014; group, and &#x2014;NHgroup, a polymerizable monomer (b) having no functional group selected from the group consisting of &#x2014;OH group, &#x2014;NH&#x2014; group, and &#x2014;NHgroup, a polymerization initiator (c), an inorganic filler (d), and a silane compound (e) which generates &#x2014;OH group by hydrolysis.

Organic-inorganic composite filler having many reaction groups on surface and dental curable composition compounded therewith

The present invention relates to a dental curing composition to restore a lost portion of a tooth generated due to dental caries, tooth fracturing, etc. The dental curing composition has packability suitable for restoring a posterior tooth; has a paste character of avoiding stickiness to a filling instrument; has excellent shaping properties; has very little paste character over time; and has a low polymerization shrinkage property. The dental curing composition comprises: (a) a matrix resin whose viscosity at 25&#xb0; C. is 10,000 to 17,000 mPa&#xb7;s, (b) an organic-inorganic composite filler, (c) an inorganic filler, and (d) a polymeric initiator.

Dental curing composition

A viscous material container that makes it unlikely that air remains in a housing when a piston is inserted from an insertion port of the housing. A first section of the housing is formed with two groove portions communicating with a first passage to discharge air in the first passage when a piston is inserted from an insertion port. The two groove portions communicate with the insertion port, and extend along a first imaginary center line.

Viscous material container having annularly contacting piston

Provided herein is a viscous material container that is not likely to form continuous streaks or asperities on the surface of a viscous material discharged from the viscous material container even if the viscous material is highly viscous. A third section of a housing includes a wall having a wall portion that is positioned radially outwardly of a continuous angular portion with respect to a second imaginary center line, and extends along the continuous angular portion. The wall portion is configured to expand radially outward when a dental viscous material pushed out from a discharge port.

Growing community of inventors

Kyoto, Japan

Hideto Kasaba