Abstract: An articulator, for use in making dentures or parts thereof. It has an upper principal member and a lower principal member. An upper support is provided for holding a maxillary cast fixedly mounted on the side of the upper member facing the lower principal member. A lower support holds a mandibular cast. This support is mounted on the lower principal member and faces the upper principal member. The lower support has a releasing/locking arrangement making it possible for an operator to move the lower support freely in several directions when the arrangement is in its released mode and to lock it in a desired position requiring only a slight holding in place of the casts in relation to each other by the operator during a locking procedure.

Abstract: A motor driven dental instrument for peeling away a layer of a tooth is provided. The rotational movement of the driving shaft is transformed into an axially oscillating, not rotatable movement of a tool support of a working tool. The working tool is able to be placed in an angular position in relation to the tool support chosen by the dentist.

Abstract: An apparatus for making holograms of an object is described. The apparatus has a laser source emitting a collimated or slightly divergent laser beam, and a holder for a holographic plate to hold the holographic plate between said object and said laser source in a position near said object. A positive lens means having its focus is placed between said lens means and said holographic plate such that a divergent laser beam is impinging on said holographic plate and cover an illuminating area on said plate extending well beyond the area of said object in a plane parallel to said holographic plate. A closed housing is placed around said laser source and said lens means, which housing has a controllable shutter to be opened only at control provided in an end wall in a position cutting the beam path of said outgoing laser beam.

Abstract: A dental instrument is described by which a tooth file is automatically driven by a driver for producing alternating movement forces in the axial direction of a tool support bearing the file to a predetermined axial limit position in each direction, the distance between these limit positions being such that the instrument tool support is able to take an axial position in which it is unaffected by those movement forces. The movement forces affect the tool support only when it is moved from the unaffected axial position by an external force exerted on it and then by only the one of the forces acting in the axial direction opposite to the external force. External forces in each direction are able to move the tool support up to a predetermined maximum amplitude of action.

Abstract: A face-bow device for registration of a patient's face and for transferring the registration to an articulator, for use in making dentures or parts thereof, comprises a bite fork on a bite fork support, an adjustment structure in which bite fork support is insertable, and a bow extending from ear to ear in front of the patient's face, on which bow the ajustment structure is mountable. The bow has two arms fixedly connected to each other. Each arm has its free end formed and adapted to be placed in the patient's ear meatus. The arms have a rounded form and are made of a resilient material in order to make them resiliently outbendable at least to such an extent that the bow having its free ends at a distance from each other suitable to the distance between the openings to the patient's ear meatuses in outbent condition is movable over the sides of the patient's face in order to place the ear bow ends into the patient's ear meatuses.

Abstract: A dental implement for abrasion, comprising a steel spatula coated on its opposite broad surfaces with an abrasive coating of tungsten applied to the steel surfaces with the aid of an electric arc. The implement is particularly useful for dentistry, because the tungsten has very little effect on the relatively hard tooth enamel but is quite abrasive on such dental materials as gold, amalgam, and dentine. Thus the implement is especially suited to smoothing tooth fillings of various types where the tooth enamel is to be left intact but the foreign material is to be evened out to make as smooth a transition as possible to the surrounding tooth enamel.

Abstract: An articulator, for use in making dentures or parts thereof, comprises a lower and an upper principal member, which are interconnected by a condylar mechanism that allows relative movements between the principal members, a turnable incisal table attached to the lower principal member and an incisal pin lockably and vertically adjustably mounted in the upper principal member above the incisal table and having a tip pointing towards the table. The articulator has a separate freedom-in-centric guide table having an upper surface located outside the rotational center of the incisal table and an extra pin lockably and vertically adjustably mounted in the upper principal member above the freedom-in-centric guide table. The extra pin is mounted at the side of the incisal pin in a separate locking device and has a tip pointing towards the guide table.

Abstract: An articulator for use in making dentures or parts thereof comprises two principal members that are movably interconnected by means of a condylar mechanism. Each of two condylar track members of said condylar mechanism is pivotable around two different axes for allowing different attitudes of the condylar track to be set, and there is a lock for locking each of said condylar track members in a desired attitude. This lock comprises for each condylar track member a locking mechanism enabling simultaneous locking against movement around the two axes, as well as enabling simultaneous unlocking for allowing movement around either or both of these axes.

Abstract: An articulator for use in making dentures or parts thereof comprises two principal members that are movably interconnected by means of a condylar mechanism. One of the principal members carries the condylar tracks of said mechanism while the other of said principal members carries the condylar shaft means of said mechanism. The condylar shaft means comprises adjustment means enabling simultaneous axial movement in opposite directions of two shaft members included in the condylar shaft means and each cooperating with a condylar ball. In this way the amount of axial play between the condylar shaft means and the condylar balls can easily be controlled.

Abstract: An articulator for use in making dentures or parts thereof wherein two principal members, pivotable relative to each other by means of conventional condylar mechanisms, have anchoring means for teeth models required for making the dentures. In order for one principal member to carry the other, it has a single, slender arm or post which at its end towards the other member carries the condylar shafts of the condylar mechanisms, with the condylar balls displaceable on said shafts, while the other principal member carries the condylar tracks.

Abstract: A hand tool comprising two moving parts; a rotating and a reciprocating part. The reciprocating part, carrying a machining tool, is imparted its movement from the rotating part via a crank mechanism with variable excentricity for adjusting the reciprocating part's length of stroke. A crank pin in said mechanism is therefore excentrically disposed on a rotatable, lockable slide excentrically journalled in a rotatable holder which is imparted its rotary movement from the drive means of the hand tool. Counterweights in the slide and its holder together counterbalance the movements of the reciprocating part corresponding to the varying lengths of stroke. Upon setting of the crank mechanism to the desired length of stroke, the counterweights are arranged to either work in conjunction or in opposition and are therefore rotatable relative each other to an extent corresponding to the relative movements of the slide and slide holder.