A NiTi alloy root canal file with a flexibility gradient includes a tip segment (F1), a middle segment (F2) and a root segment (F3) divided along the axis of the NiTi alloy root canal file with the flexibility gradient. The internal microstructure of the tip segment (F1) of the root canal file is martensite M-phase, the internal microstructure of the middle segment (F2) is R-phase, and the internal microstructure of the root segment (F3) is austenite A-Phase. The present invention further provides a manufacturing method for the NiTi alloy root canal file with the flexibility gradient. The beneficial effect of the present invention is effectively improving safety in use.

The present disclosure relates to a dental implant which comprises in its interior vertical and radial channels terminating in the form of holes in the lateral and lower surfaces of the implant and wherein each channel is filled by electrically conductive material in order to promote multiple electric fields along the surface of the implant. Electric fields range from 5 to 100 mv. A dental implant is described defining an axis along its length, obtained from a sintered block, which comprises in its interior longitudinal and radial channels which terminate in the form of holes in the surface of the implant and wherein each channel comprises an electrically conductive material for promoting multiple electric fields along the surface of the implant.

A polymerisable dental composite material comprising (i) 70 to 85% by weight of an inorganic filler component comprising at least one dental glass and optionally at least one amorphous metal oxide, (ii) 10 to 30% by weight of a mixture of at least two different urethane (meth)acrylates, (iii) 0.01 to 5% by weight of at least one di-, tri-, tetra- or multi-functional monomer not being a urethane (meth)acrylate, (iv) 0.01 to 10% by weight of at least one initiator, of an initiator system and optionally of at least one stabilizer and optionally of at least one pigment, wherein the total composition of the composite material amounts to 100% by weight, as well as a polymerized composite material having a flexural strength of greater than or equal to 200 MPa and an elastic modulus of 15 to 20 GPa for the production of indirect dentures.

The invention comprises an assortment of apparatuses to magnetically tether a dental hygienist's hand to the utility tubes and hoses commonly found in a dental office. In a preferred embodiment, this consists of an adjustable silicone utility band containing a magnet which is worn by the hygienist. This tethers him or her to a utility hose or tube, which has a clasp that contains a reciprocal magnet. In other embodiments, the invention comprises rings or fingergrips which contain magnets that tether to the utility hose or tube via the magnetized clasp.

A jaw implant (1) having at least one approximately U-shaped hole strip (2), which carries fixing holes (3) spaced apart from one another. In the jaw implant (1), in the space between adjacent fixing holes (3) there are provided cross-sectional weaknesses (4) for cutting the at least one hole strip (2) to length. The at least one hole strip (2) has, in a partial region (8) situated at a distance from the free ends (6, 7) of this hole strip (2), in the region of every fixing hole (3) having an internal screw thread for fixing a dental prosthesis, a cross-sectional widening (9) which increases the longitudinal extension of this fixing hole (3).

A temporary alignment system and method for holding a dental coping to an implant abutment using the same threads in the abutment that are used for definitive attachment are disclosed. The disclosed temporary fasteners initially orient and hold a coping against an abutment with a force along the same axis as the semi-definitive screw. The aligned coping can be picked-up in a closed-tray impression process without unscrewing the temporary fastener. Embodiments include threaded posts that release copings from the abutment through axial forces. Some embodiments include a threaded post with separable cap that is picked-up with the coping. Methods for converting an existing prosthesis for screw attachment to implants in a single visit and digital capture of the converted prosthesis are described.

The invention relates to an intermediate dental abutment (2), intended to be inserted into a dental implant (1), the intermediate abutment (2) comprising: a lower part (20), intended to be inserted into an implant (1); an intermediate part (28), comprising an external connection device (29) for connecting a blanking element (4) of anatomical shape to close off the site of the post-extraction cavity; an upper part (24) comprising a fixing device (304) for fixing a member (9, 100), such as an impression abutment (9) or a prosthetic abutment (100).

A polymerisable radiation-curable composition comprising: (i) monomers, comprising at least (a) a first monomer having a TG (glass-transition point) of the homopolymer of said first monomer ?120? C. and at least (b) a second monomer having a TG (glass-transition point) of the homopolymer of the second monomer ?100? C., wherein at least one of the at least one first monomer or of the at least one second monomer has an alicyclic group, and comprising (ii) at least one further component, comprising at least one photo-initiator for the UV and/or Vis spectral region or a photo-initiator system for the UV and/or Vis spectral region. Also disclosed is a blank in the form of a three-dimensional moulded body of a polymerised composition, in particular radiation-cured composition, for producing 3D moulded bodies, dental prosthetic parts, orthopaedic appliances or dental pre-forms in a rapid prototyping, rapid manufacturing, or rapid tooling method.

A temporary alignment system and method for holding a dental coping to an implant abutment using the same threads in the abutment that are used for definitive attachment are disclosed. The disclosed temporary fasteners initially orient and hold a coping against an abutment with a force along the same axis as the semi-definitive screw. The aligned coping can be picked-up in a closed-tray impression process without unscrewing the temporary fastener. Embodiments include threaded posts that release copings from the abutment through axial forces. Some embodiments include a threaded post with separable cap that is picked-up with the coping. Methods for converting an existing prosthesis for screw attachment to implants in a single visit and digital capture of the converted prosthesis are described.

An object of the present invention is to provide a dental composition that exhibits small polymerization shrinkage stress, and provides excellent mechanical strength. The present invention relates to a dental composition comprising a compound (A), a monomer (B) having a solubility of 50 g/L or more in acetone at 25? C., and a polymerization initiator (C),

wherein the compound (A) has a weight-average molecular weight of 1,000 to 80,000, and includes a Tg of less than 40? C., in addition to having a solubility of less than 50 g/L in acetone at 25? C. Preferably, the compound (A) comprises a compound having a polymerizable group.