Abstract: A holder for a bit is disclosed. The bit may include a first locking element. The holder may include a housing; a base assembly including a first hole; a second locking element partially disposed within the first hole and configured to move between a locking position in which the second locking element engages the first locking element to prevent removal of the bit, and an unlocking position in which the second locking element is spaced from the first locking element allowing the bit to be removed; and a follower assembly contained within the housing and configured to move relative to the housing and base assembly between a first position in which the follower assembly supports the second locking element in the locking position, and a second position in which the follower assembly allows the second locking element to move from the locking position to the unlocking position.

Abstract: A powered surgical instrument is provided. In some embodiments, the powered surgical instrument may include a housing; a receiver, at least a portion of the receiver is movably received within the housing, a distal end portion of the receiver being configured to receive an expander adapted to expand a tooth socket within a treatment area, wherein the receiver is configured to move between a first receiver position and a second receiver position; a bias assembly operatively connected to the receiver and configured to urge the receiver towards the second receiver position; and an actuator disposed within the housing and configured to move the receiver at least from the first receiver position to the second receiver position, wherein the receiver is configured to be selectively moved between the first and second receiver positions independent of the actuator.