Retentive force of the cone crown telescope prosthesis using ceria­stabilized zirconia/alumina nanocomposite with a CAD/CAM system

Abstract

The purpose of this research was to determine factors among various manufacturing conditions that affect the retentive force of the cone crown telescope prosthesis using ceria­stabilized zirconia/alumina nanocomposite (Ce­TZP/A) with a CAD/CAM system. Ce­ TZP/A was used for the primary and secondary crowns. We conferred one of three cone angles for the axial surface of the primary crown and one of three shapes for the tooth cervix border. The conditions for the secondary crown included the milling bur usage fre­ quency, space between the primary and secondary crowns, different lot numbers of the zirconia disks, thickness of the secondary crown, placement location on the sintering tray, and disk milling processing position. The factors, set at the two­ or three­level, were allocated to an L 18 experimental array. We searched for factors that affected retentive force among all the factors. The point estimations for cone angles of 2°,4°and6°were 35.8 N, 15.9 N and 1.4 N, respectively. The conical angle was a significant factor for the retentive force of the cone crown telescope prosthesis using Ce­TZP/A with a CAD/CAM system. (J Osaka Dent Univ 2017 ;51 : 55­62)