4. Subjects must need a crown on either a second premolar, first molar or second molar on any arch. Abutment teeth must be restorable and have a crown root ratio of at least 1:1. Abutment teeth must have a complement of opposing non-restored or minimally restored natural teeth. Minimally restored means nothing beyond a Class II amalgam restoration. Opposing arch cannot be a full coverage restoration or a partial denture. Contralateral tooth must be preferably present.