An apparatus for use in a wellbore comprises a housing having a longitudinal axis and a mechanism having one or more impact elements adapted to move along the longitudinal axis in an oscillating manner to impart a back and forth force on the housing to vibrate the housing. The windings have winding axes each disposed at right angles to one another and intersecting at a common point. A kit of preforms containing multiple bins of various geometrical shapes and sizes are available to repair mainly molars and premolars in the upper and lower arches. A flexible floor panel has a plurality of sides.