Management of dentin hypersensitivity is only one part of a successful dental complete coverage restoration (dental crown or bridge). In evaluating the clinical service-life of porcelain crowns there are three aspects of the bonding environment that needs to be considered. These consist of the tooth preparation, the adhesive and the tooth or crown preparation and the fit of the porcelain restoration to the tooth preparation. All ceramic restorations need enamel and dentin reduction of at least 1.5 mm along with a smooth shoulder and avoidance of sharp edges to avoid crack formation on the intaglio surface, proper esthetics, physiological contours and strength of the final restoration.(Goodacre, Campagni et al. 2001) Dental preparation for full coverage restorations (1.5 to 2 mm clearance which often means 1.5 - 2 mm loss of tooth structure) are inherently non-conservative and with a reduced amount of remaining tooth structure there is an elevated risk of post-operative sensitivity.