Computer-aided Design/Computer-aided Manufacturing (CAD/ CAM) Machines With Scanning and Milling Capabilities for Fabricating Custom Posts and Cores: A Narrative Review

ABSTRACT

@#Custom cast metal posts and cores are time-consuming to make, requiring several clinical and laboratory stages and the use of gold, cobalt-, or nickel-chromium. Aside from the numerous stages involved, a cast metal post and core has a significantly higher modulus of elasticity than the dentinal root structure and, as a result, is more likely to cause root fracture. Furthermore, the metal colour of the post and core, which always appears as a dark shadow beneath a ceramic crown, is an aesthetic concern. Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM) of posts and cores is a potential fabrication option for overcoming the issues associated with cast metal posts and cores. Some of the time-consuming clinical and laboratory procedures can be eliminated by using a CAD/CAM machine, and tooth-colored materials can be milled to create custom posts and cores. The marginal and internal adaptation of the CAD/CAM produced posts and cores to the tooth structure, on the other hand, is highly dependent on the scanning accuracy and milling capability of the CAD/CAM machine. Because the majority of studies on dental CAD/ CAM have concentrated on the fabrication of fixed and removable prostheses, data on the marginal accuracy and internal adaptation of CAD/CAM produced posts and cores is limited. As a result, the aim of this review paper is to determine the current state of the market’s CAD/CAM machines in terms of their scanning and milling capability to produce custom posts and cores that match the marginal and fitting accuracy of cast metal posts and cores.