A dental handpiece comprises an outer sleeve (1), a tool-holding socket (2) for holding a treatment tool (3) arranged in the handpiece, wherein the tool-holding socket (2) has a central axis about which the tool-holding socket (2) can be rotated and/or oscillated and wherein the tool-holding socket (2) is arranged to be driven by a driveshaft of the handpiece driven by a motor (10) housed in the outer sleeve (1). At least one Peltier element (5) is received in the handpiece in thermal contact with the tool-holding socket (2), the Peltier element (5) having a cool face in thermal contact with the tool-holding socket (2) to cool a treatment tool (3) held therein when the tool (3) is driven in rotation or oscillation.

The present invention relates to a direct cooling type handpiece, and more particularly, to a direct cooling type handpiece that is configured to allow an outer housing and a core to be spaced apart from each other and thus to allow the core to be fixed to a PCB and a support cap, so that air flows to the space between the outer housing and the core, thus efficiently cooling the high heat generated from the handpiece while the handpiece is being operated.

The present invention relates to a direct cooling type handpiece, and more particularly, to a direct cooling type handpiece that is configured to allow an outer housing and a core to be spaced apart from each other and thus to allow the core to be fixed to a PCB and a support cap, so that air flows to the space between the outer housing and the core, thus efficiently cooling the high heat generated from the handpiece while the handpiece is being operated.

An electrically safe treatment system for use in treating a patient includes two or more sections coupled with a joint that permits any one section to rotate relative to another coupled section. At least one of the sections includes an electrical component. An electrical contact associated with the joint is designed to maintain an electrical connection between a pair of sections throughout an angular range of motion of one of the sections relative to the other, coupled section. The electrical contact can also maintain a total resistance of a series connection including the two sections and the contact below a specified threshold. Alternatively, one or more insulator joints may be employed to meet safety requirements.

An electrically safe treatment system for use in treating a patient includes two or more sections coupled with a joint that permits any one section to rotate relative to another coupled section. At least one of the sections includes an electrical component. An electrical contact associated with the joint is designed to maintain an electrical connection between a pair of sections throughout an angular range of motion of one of the sections relative to the other, coupled section. The electrical contact can also maintain a total resistance of a series connection including the two sections and the contact below a specified threshold. Alternatively, one or more insulator joints may be employed to meet safety requirements.

An electrically safe treatment system for use in treating a patient includes two or more sections coupled with a joint that permits any one section to rotate relative to another coupled section. At least one of the sections includes an electrical component. An electrical contact associated with the joint is designed to maintain an electrical connection between a pair of sections throughout an angular range of motion of one of the sections relative to the other, coupled section. The electrical contact can also maintain a total resistance of a series connection including the two sections and the contact below a specified threshold. Alternatively, one or more insulator joints may be employed to meet safety requirements.

An electrically safe treatment system for use in treating a patient includes two or more sections coupled with a joint that permits any one section to rotate relative to another coupled section. At least one of the sections includes an electrical component. An electrical contact associated with the joint is designed to maintain an electrical connection between a pair of sections throughout an angular range of motion of one of the sections relative to the other, coupled section. The electrical contact can also maintain a total resistance of a series connection including the two sections and the contact below a specified threshold. Alternatively, one or more insulator joints may be employed to meet safety requirements.

A snap-on snap-off drill stop device for boring into a tooth and or in bone. The stop device that impedes insertion of the bore device into the tooth or bone tissue beyond predetermined depths at pre-selected stages of a drilling process by simplifying the tedious process of exchanging drill bits and drill stops for the ultimate size and depth bore.

A composition delivery source (300) includes a chamber (302), a solid-liquid composition delivery tube (314), a mixing tube (316), and a liquid-supply tube (318). A filter (304) divides the chamber (302) into a liquid compartment (306) and a solid-liquid composition compartment (308). The solid-liquid composition delivery tube (314) is in fluid communication with the solid-liquid composition compartment (308). The mixing tube (316) is in fluid communication with the liquid compartment (306) and the solid-liquid composition compartment (308). The liquid-supply tube (318) is in fluid communication with the liquid compartment (306) and a liquid solution container (366). A pump unit (301) is provided that includes a mixing pump (322), which is arranged to cause flow in the mixing tube (316); and a liquid-supply pump (324), which is arranged to cause flow in the liquid-supply tube (318). Other embodiments are also described.

A composition delivery source (300) includes a chamber (302), a solid-liquid composition delivery tube (314), a mixing tube (316), and a liquid-supply tube (318). A filter (304) divides the chamber (302) into a liquid compartment (306) and a solid-liquid composition compartment (308). The solid-liquid composition delivery tube (314) is in fluid communication with the solid-liquid composition compartment (308). The mixing tube (316) is in fluid communication with the liquid compartment (306) and the solid-liquid composition compartment (308). The liquid-supply tube (318) is in fluid communication with the liquid compartment (306) and a liquid solution container (366). A pump unit (301) is provided that includes a mixing pump (322), which is arranged to cause flow in the mixing tube (316); and a liquid-supply pump (324), which is arranged to cause flow in the liquid-supply tube (318). Other embodiments are also described.