Abstract: A dental prophylactic treatment device having: a prophylactic contra-angle handpiece having a handle part extending along a longitudinal axis, a head part adjoining the handle part, a tool holder rotatably disposed in the head part and extending along an axis of rotation, wherein the longitudinal axis of the handle part and the axis of rotation of the head part are disposed at an angle to one another, and a dental tool having a tool shaft and a prophylactic treatment section, wherein the tool shaft extends from a handpiece end of the dental tool over a length up to the prophylactic treatment section, wherein at least a section of the tool shaft is detachably received in the tool holder, so that the dental tool together with the tool holder can be rotated about the axis of rotation, and wherein the length of the tool shaft is a maximum of 10.0 mm.

Abstract: A medical or dental device for determining a bone's quality by cutting a thread into the bone with a rotating threaded element comprises a control unit having a measurement circuit configured: (i) to determine values of the motor current via a first electrical contact device with which the motor drive is supplied for rotational drive of the threaded element that can be connected to the motor drive, the current values being a measure of the bone's quality; (ii) to monitor and/or to determine the penetration depth of the threaded element into the bone, and (iii) to generate measurement signals which show the relationship between the penetration depth and the determined current values or parameters derived therefrom, and to transmit these signals to a display unit, which displays the relationship between the determined current values or parameters derived therefrom, in particular the bone's quality, and the penetration depth.

Abstract: A medical or dental device for determining a bone's quality by cutting a thread into the bone with a rotating threaded element comprises a control unit having a measurement circuit configured: (i) to determine values of the motor current via a first electrical contact device with which the motor drive is supplied for rotational drive of the threaded element that can be connected to the motor drive, the current values being a measure of the bone's quality; (ii) to monitor and/or to determine the penetration depth of the threaded element into the bone, and (iii) to generate measurement signals which show the relationship between the penetration depth and the determined current values or parameters derived therefrom, and to transmit these signals to a display unit, which displays the relationship between the determined current values or parameters derived therefrom, in particular the bone's quality, and the penetration depth.

Abstract: A medical or dental device for determining a bone's quality by cutting a thread into the bone with a rotating threaded element comprises a control unit having a measurement circuit configured: (i) to determine values of the motor current via a first electrical contact device with which the motor drive is supplied for rotational drive of the threaded element that can be connected to the motor drive, the current values being a measure of the bone's quality; (ii) to monitor and/or to determine the penetration depth of the threaded element into the bone, and (iii) to generate measurement signals which show the relationship between the penetration depth and the determined current values or parameters derived therefrom, and to transmit these signals to a display unit, which displays the relationship between the determined current values or parameters derived therefrom, in particular the bone's quality, and the penetration depth.

Abstract: A dental prophylactic treatment device having: a prophylactic contra-angle handpiece having a handle part extending along a longitudinal axis, a head part adjoining the handle part, a tool holder rotatably disposed in the head part and extending along an axis of rotation, wherein the longitudinal axis of the handle part and the axis of rotation of the head part are disposed at an angle to one another, and a dental tool having a tool shaft and a prophylactic treatment section, wherein the tool shaft extends from a handpiece end of the dental tool over a length up to the prophylactic treatment section, wherein at least a section of the tool shaft is detachably received in the tool holder, so that the dental tool together with the tool holder can be rotated about the axis of rotation, and wherein the length of the tool shaft is a maximum of 10.0 mm.

Abstract: A medical or dental device for determining a bone's quality by cutting a thread into the bone with a rotating threaded element comprises a control unit having a measurement circuit configured: (i) to determine values of the motor current via a first electrical contact device with which the motor drive is supplied for rotational drive of the threaded element that can be connected to the motor drive, the current values being a measure of the bone's quality; (ii) to monitor and/or to determine the penetration depth of the threaded element into the bone, and (iii) to generate measurement signals which show the relationship between the penetration depth and the determined current values or parameters derived therefrom, and to transmit these signals to a display unit, which displays the relationship between the determined current values or parameters derived therefrom, in particular the bone's quality, and the penetration depth.

Abstract: The medical or dental handpiece comprises a rotary part and at least one roller bearing which is provided for bearing support of the rotary part. The roller bearing has a bearing inner ring and a bearing outer ring, each having a raceway for the at least one rolling element arranged therebetween. The rotary part is mounted on at least one bearing ring on the side having the raceway for the at least one rolling element.

Abstract: The medical or dental handpiece comprises a rotary part and at least one roller bearing which is provided for bearing support of the rotary part. The roller bearing has a bearing inner ring and a bearing outer ring, each having a raceway for the at least one rolling element arranged therebetween. The rotary part is mounted on at least one bearing ring on the side having the raceway for the at least one rolling element.

Abstract: A medical or dental handheld element has a rotatably arranged rotary part, at least one roller bearing for bearing support of the rotatably arranged rotary part, the roller bearing having at least one rotatable roller bearing part that is co-rotational with the rotary part and at least one stationary roller bearing part that is stationary in relation to the rotary part, and an anti-twist device or anti-rotation element provided to restrict the stationary roller bearing part from rotating. The anti-twist device comprises a polygonal, generally arc-shaped, open metallic anti-twist device. A handheld element with this anti-twist device is less sensitive to the effects of sterilization or cleaning processes. Also disclosed is a method for manufacturing such a handheld element.