Abstract: A power tool chuck includes a body with a central bore extending along an axis and configured to receive a tool bit, a plurality of angled passageways, and a plurality of jaws received in the passageways and moveable between an axially forward and radially inward clamping position and an axially rearward and radially outward retracted position. At least one jaw has a rear end lying in a first plane transverse to the axis. A first key drive member coupled to a tail portion of the body is configured to be engaged by a second key drive member on a power tool output shaft to non-rotationally couple the body to the output shaft. The first key drive has a forward end lying in a second plane transverse to the axis. The second plane is axially forward of the first plane when the jaws are in the retracted position.

Abstract: A prosthetic dental implant which is surgically implantable in the maxillary and mandibular alveolar bones, providing a support base with a protruding post to which one or more prosthetic crown replacements are to be mounted. The implant is a high purity, high density, low porosity unitary alumina body having a serrated base. Its integral top is formed to provide an upwardly extending post with a truncated ellipsodially conical configuration for the attachment of a prosthetic tooth crown. The serrated side walls of the base are formed with outwardly projecting protrusions. These protrusions have a serrated or saw toothed cross sectional configuration with alternating horizontal surfaces and downwardly and outwardly tapering oblique surfaces.