A dual-purpose sintering furnace including a furnace body having a furnace chamber, a first furnace mouth and a second furnace mouth which are communicated with the furnace chamber, a furnace door hinged to the furnace body and configured for closing the first furnace mouth, a blocking member lap-jointed inside the furnace chamber and configured for blocking the second furnace mouth, a sample stage, an ejection rod fixedly arranged on a sample placement face of the sample stage, a lifting device configured for driving the sample stage to raise or lower, so that the ejection rod pushes the blocking member until the second furnace mouth is opened, and so that the sample stage enters the furnace chamber through the second furnace mouth. The dual-purpose sintering furnace can complete a large amount of sintering as conventional sintering and also implement rapid sintering.

A base shaft 4 with a built-in magnet is rotatably projected on a base 1. A rocking body 7 has a square substrate 8, a sphere 9, a sphere holder 10 rotatable around an axis which extends through the center of the substrate and perpendicular to the substrate, and a stopper for fixing the sphere holder at a desired rotational position. The sphere holder holds the sphere in such a way that the sphere is fixed at a desired rotational position. A stage is attached to the sphere through a support rod 20. A lower portion of the sphere protrudes downward from the sphere holder and substrate. The rocking body is magnetically coupled to the base shaft at a lower end of the sphere. An elevating body 21 is fitted on the base shaft and fixed by a set collar 22 at a desired height. The elevating body has a recess for receiving the lower portion of the sphere. The rocking body takes a horizontal position when the elevating body is brought into contact with the substrate of the rocking body, but takes a tilt position when a side of the substrate is brought into contact with an upper surface of the elevating body after the elevating body is lowered. An angle display mechanism 23 displays a tilt angle at the tilt position of the rocking body depending on the height of the elevating body.

A center-cast tool for casting a non-uniform object is provided. The center-cast tool has a body having a casting bay recessed into the top side of the body. A base forms the bottom of the casting bay. First and second apertures extend through the base and the bottom side. The second aperture intersects the first aperture in perpendicular orientation to the first aperture to form an aperture intersection. The aperture intersection forms four opposing right angles on the base at the center of the bay. The distance between adjacent right angles in the base is equal to the length of each side of the bezel of a jewelry article into which the finish machined irregular object will be set. In another embodiment, a first release hole extends through the base and the bottom side on a first side of the aperture intersection.

A crown handling device is provided to allow an operator to hold the crown between fingers. The crown handling device comprises a matrix member; and a pinch holding member having a substantially round shape and a plurality of openings for inserting therethrough the matrix member secured to one side of the pinch holding member.

A machinable preform for shaping into dental restorations is described that comprises material having suitable strength for use in dental applications without requiring further processing after shaping to strengthen the material (such as sintering). In one embodiment, a preform is comprised of a machinable dental material having a Vickers hardness value in the range of 4 HV GPa to 20 HV GPa, and comprises a body and a stem that extends from the outer surface of the body that supports the body during shaping. A method for making the machinable preform, and a kit comprising a machinable preform and a grinding tool, are also described.

A machinable preform for shaping into dental restorations is described that comprises material having suitable strength for use in dental applications without requiring further processing after shaping to strengthen the material (such as sintering). In one embodiment, a preform is comprised of a machinable dental material having a Vickers hardness value in the range of 4HV GPa to 20HV GPa, and comprises a body and a stem that extends from the outer surface of the body that supports the body during shaping. A method for making the machinable preform, and a kit comprising a machinable preform and a grinding tool, are also described.

A fixture plate includes a base having a contact face configured to support a dental model having a material formed thereon. The material includes an aligner material portion and an excess material portion. The fixture plate includes one or more channels formed in the contact face. The fixture plate includes a bore extending through the base from a bottom opening to the contact face. A portion of the bore located along the bottom opening is configured to couple with a hose of a vacuum system configured to generate a suction force at the contact face via the one or more channels. The suction force is applied to the dental model and at least part of the excess material portion to retain the dental model and the material formed thereon against the contact face.

A fixture plate includes a base having a contact face configured to support a dental model having a material formed thereon. The material includes an aligner material portion and an excess material portion. The fixture plate includes one or more channels formed in the contact face. The fixture plate includes a bore extending through the base from a bottom opening to the contact face. A portion of the bore located along the bottom opening is configured to couple with a hose of a vacuum system configured to generate a suction force at the contact face via the one or more channels. The suction force is applied to the dental model and at least part of the excess material portion to retain the dental model and the material formed thereon against the contact face.

A method for manufacturing and machining dental, maxillofacial and trauma prostheses and for optimizing an amount of time used in machining a prosthesis that has been previously manufactured with additive manufacturing technology is provided. The method includes manufacturing, by using excess material and additive manufacturing technology on a printing plate, a prosthetic block including at least a prosthesis. The method further includes joining pieces and positioning elements with specific dimensions and distances between the same; positioning the prosthetic block on a machining tray using the positioning elements; fixing the prosthetic block to the machining tray using the positioning elements; and fixing the machining tray to a machining machine, such that the prosthesis is fixed in a specific and known position in the machining machine by the specific dimensions and distances of the prosthetic block. The method further includes performing a machining operation to critical areas of the prosthesis.

Disclosed is a method of manufacturing a digital overdenture to improve manufacturing convenience and preciseness. The method of manufacturing the digital overdenture according to the present invention includes a series of operations such as generating a planning image, manufacturing auxiliary devices for manufacturing the overdenture such as a surgical guide, a flattening guide, an impression model, and the like, setting a holder device and correcting a temporary denture, obtaining a corrected-scanned image, and designing and manufacturing a digital overdenture.