The present invention relates to a dental etching composition comprising phosphoric acid, water and urethane-urea compound(s), to the use of said dental etching composition for etching the hard substance of the tooth, to a dental etching composition for use in a therapeutic method of etching the hard substance of the tooth in the course of filling treatment, and to a kit comprising a dental etching composition.

The present invention relates to a dental etching composition comprising phosphoric acid, water and urethane-urea compound(s), to the use of said dental etching composition for etching the hard substance of the tooth, to a dental etching composition for use in a therapeutic method of etching the hard substance of the tooth in the course of filling treatment, and to a kit comprising a dental etching composition.

Methods and systems are provided for generating a treatment plan for arch expansion where a polymeric shell appliance is utilized to generate one or more activation forces that facilitate tooth movement. The polymeric shell appliances may comprise one or more tooth receiving cavities, in which each of the plurality of tooth receiving cavities is shaped and arranged to provide a counter moment of each of the plurality of teeth.

A medical apparatus including a bar with a first attachment loop, a second attachment and a plurality of hooks, wherein the medical apparatus is an arch bar.

[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.

##STR00001##

(wherein R.sub.1 represents a substituent consisting of three or more carbons having an electron-withdrawing group at α-carbon and/or ε-carbon of an amine starting from N, R.sub.2 represents a substituent consisting of three or more carbons which may have an electron-withdrawing group, R.sub.3 represents 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.)

[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.

##STR00001##

(wherein R.sub.1 represents a substituent consisting of three or more carbons having an electron-withdrawing group at α-carbon and/or ε-carbon of an amine starting from N, R.sub.2 represents a substituent consisting of three or more carbons which may have an electron-withdrawing group, R.sub.3 represents 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.)

To provide a dental photocurable composition having good storage stability of a matrix containing a polymerizable monomer and a polymerization initiator, etc. and excellent mechanical strength of a dental photocurable composition comprising a mixture of the matrix and a filler. The dental photocurable composition of the present disclosure comprises a matrix containing (A) polymerizable monomer, (B) photosensitizer, (C) photoacid generator and (D) photopolymerization accelerator, and (E) filler, wherein, the dental photocurable composition comprises (A1) polymerizable monomer having an acidic group as the (A) polymerizable monomer, and the dental photocurable composition comprises (D1) tertiary aliphatic amine compound having Log P of 2 or more and pKa of 10 or less as the (D) photopolymerization accelerator.

The invention relates to a multi-layer, preferably co-extruded, plastic film with improved modulus properties, which is suitable, in particular, for producing three-dimensionally shaped articles.

Disclosed is a bite blocker device for preventing occlusion of an affected dentition. The channel of the bite block follows and engages a portion of the user's upper teeth, while a base portion, opposite the channel portion, follows and engages a portion of the user's lower teeth. The base portion and the channel are separated forming a gap between the user's upper teeth and lower teeth. The bite block is placed substantially opposite the affected tooth or teeth, the gap formed by the bite block preventing occlusion of the affected teeth.

A continuous fiber-reinforced build material for additive manufacturing (AM) of fiber-reinforced composite (FRC) structures, a machine for the preparation of the build material, and use of the build material for manufacturing of three-dimensional (3D) FRC end-product devices, such as medical devices for management of musculoskeletal and dental disorders.