<prompt> Which of the following is true of an occlusal rest for a removable partial denture?1. One-third facial lingual width of the tooth2. 1.5 mm deep for base metal3. 2.0 mm labiolingual width of the tooth4. Floor inclines apically toward the center of the toothAll of the above1, 3, and 41, 2, and 43 and 4  <response>: Rests are critical for the health of the soft tissues underlying the denture resin basis and the minor and major connectors. It should prevent tilting action and should direct forces through the long axis of the abutment tooth. In order to function as specified, an occlusal rest should have a rounded semicircular outline form, be one-third the facial lingual width of the tooth, one-half the width between cusps, and at least 1.5 mm deep for base metal. The rest floor inclines apically toward the center of the tooth and the angle formed with the vertical minor connector should be less than 90 degrees. 