摘要:
An endodontic instrument for cleaning/shaping a tooth root canal that includes an elongated shaft composed of a porous material, the shaft having a proximal end portion, a distal end and a tapered working portion having an external surface and a rotational axis, the working portion extending from the proximal end portion to the distal end.
摘要:
Cordless endodontic handpiece (1) with a rotary and reciprocating operating mode for driving an endodontic instrument in an endodontic treatment, comprising: (a) an elongated housing (10) having a proximal end (11) and a distal end (12); the housing containing (a1) a controller (21); (a2) a rechargeable battery (30) provided distally adjacent to the controller (21); (a3) a power electronic device (22) provided distally adjacent to the rechargeable battery (30); and (a4) a motor (40) provided distally adjacent to and contacting the power electronic device (22);
the handpiece further comprising (b) a reduction gear (50) provided distally adjacent to the motor (40); wherein - the reduction gear (50) has a reduction gear ratio of at most 12 :1, - the motor has a torque constant in the range of from 2 to 10 mNm/A; and - the motor has a phase to phase resistance in the range of from 0.05 Ω to 3.0 Ω.
摘要:
The invention relates to an endodontic instrument comprising a shaft to be secured in an instrument-carrier and an active part to be introduced into a root canal, the active part comprising a plurality of faces (21, 22, 23) and at least one edge (25, 26, 27) formed by the intersection of two faces; at least two of said adjacent faces having a surface with a roughness presenting an arithmetic mean deviation from the mean line Ra, selected such that 0.5μm
摘要:
A method for manufacturing a nonlinear superelastic file comprising the steps providing a superelastic file having a shaft and a file axis; providing a fixture including a groove being defined by one or more displacement members, the file groove configured receiving the shaft; inserting at least a portion of the shaft into the fixture along the file groove the portion of the shaft including a first portion of the shaft; contacting the first portion of the shaft with a first displacement member of the one or more displacement members such that first portion of the shaft is displaced from the file axis thereby forming a first offset portion of shaft; heating the portion of the shaft while inserted in the fixture to a temperature of at least about 300°C for a time period of at least about 1 minute to shape-set the portion of the sh thereby forming a shape-set nonlinear file.
摘要:
Various systems, method, and compositions for treating a tooth are disclosed herein. For example, an apparatus for treating a tooth is disclosed. The apparatus can include a chamber having an access port which places the chamber in fluid communication with a treatment region of the tooth when the chamber is coupled to tooth. A fluid motion generator can be coupled to the chamber. The fluid motion generator can be configured to direct fluid across the access port to generate fluid motion in the chamber. In various embodiments, fluid motion (e.g., vortices, swirl, etc.) can be induced at or near treatment regions of the tooth, such as a root canal or carious region.
摘要:
The invention relates to an endodontic instrument (20) for drilling root canals in a tooth. Said instrument comprises a working area (21) arranged so as to form and/or shape and/or cut the inner wall of the root canal. To this end, it is provided with a plurality of flutes wound around a central axis in the form of a spiral, within a conical envelope (25) having a cross-section that becomes narrower from one end (23) to the other end (26) of the instrument. Said working area (21) is sub-divided into adjacent segments (S) wherein the flutes alternately have a straight section and a section that is twisted in the form of a spiral and are arranged in such a way that the edges thereof are located either on the conical envelope (25) or inside said envelope on the straight sections or on the twisted sections.
摘要:
A flexible instrument comprising an elongated metallic element that is subject to lateral and torsional stress as used and in which the instrument is stabilized by training under deformation in an induced martensitic phase that persists under pre-determined working temperatures.
摘要:
The invention is a reamer ( 1 ) with an improved blade for use in root canal preparation, said blade being spiral - shaped with a pitch increasing towards the tip ( 2 ), and with a cutting or non-cutting tip. At given points along the length of the spiral of the blade, there is a plurality of gaps ( 8 ), the spiral starting again beyond the gaps, wherein the portion where the spiral is interrupted has either constant or decreasing cross section linking the two diameters before and after the gap.