Adaptação marginal de coroa de porcelana unitária feita pelo sistema CAD/CAM comparada com a adaptação marginal de coroa de porcelana prensada

Abstract

This study aims to verify specifically the marginal adaptation of porcelain crowns made by CAD/CAM system (E.max.cad) and pressed porcelain copings (IPS e.max press) obtained directly from an anatomical pillar (Neodent)*. For this, the general objectives involve characteristics of the evolution of the dental restorations, inform about the processing of pressed crowns and by CAD/CAM system and discuss the quality ofmarginal adaptation of the two processes. The bibliographic survey featured 67 scientific texts, including research papers, literature reviews and clinical reports, as well as secondary sources, in the period of 1965 to 2017. Was made an acrylic resin chemically activated with rectangular format, featuring 2,2cm height and 1,5 cm width. In the center of the base was installed an implant of the morse conic system (Neodent)*with 11 mm long and 4,0mm in diameter and fixed an anatomical trunnion morse taper, which was adjusted with a torque of 15 N/cm with the aid of a manual wrench. After scan and export procedures for the milling, three 2measures of total crown/prosthetic component interface into four pre-set points relating to each side (mesial, distal vestibular, lingual) were realized, and then was obtained the mean cervical jointleakage of the prosthetic component porcelain crown. The same was done with the coping of emax press obtained directly from anatomical pillar. The general objectives were achieved and the specific goal led to the conclusion that, when comparing the adaptation of E.max.CAD crowns with pressed E.max, the adaptation of e.max press coping (pressed) was a little bit worst than the adaptation of the e.max.cad crown made through the CAD/CAM system.