Dental instruments for use in dental procedures, endodontic procedures, and oral surgeries; medical and dental sonic energy delivery systems, comprised of hand-held applicators for delivery of flowable materials, spacer caps, sealing caps, tooth caps, sizers for gauging depth, monitors, and consoles; hand-held applicators for delivery of flowable materials, spacer caps, sealing caps, tooth caps, sizers for gauging depth, monitors, and consoles, all for use in medical and dental procedures; kits comprising hand-held applicators for the delivery of flowable materials, spacer caps, sealing caps, tooth caps, and sizers for gauging depth, all for use in medical and dental procedures