OBJECTIVE The present study, divided into two parts, aimed to compare the strength, fracture toughness and microstructure of a range of all-ceramic materials. In part I, three hot-pressed glass-ceramics (IPS-Empress, Empress 2 and a new experimental ceramic) and alumina glass-infiltrated ceramics (In-Ceram Alumina), processed by both slip casting and dry pressing, were compared. METHODS Tensi...

statement of problem: the connector area is the weakest zone of an all-ceramic fixed partial denture (fpd), where most catastrophic failures of the prostheses tend to occur. purpose: the aim of the present study was to assess the effect of the convergence angle of abutments on the fracture resistance of three-unit fixed partial dentures made of ips-empress2. materials and methods: forty extract...

A valuable characteristic of the "IPS Empress" used for producing all ceramic dental restorations is that it is a prefired ceramic ingot. The ingot is heated, softened and press-injected into the cavity, and ceramic restorations are fabricated by the lost wax casting method. The leucite crystal present in the ingot are scattered and distributed into the glassy phase in a more homogeneous manner...

Dental materials need to be thoroughly examined in order to assess their long-term therapeutical value. Chemical degradation of dental ceramic material enhances its roughness, leading to the wear of the opposing natural tooth or restorative material, greater plaque attachment to ceramics, weakening of the ceramic structure causing the critical ion exchange at the surface and enhancing the sensi...

OBJECTIVE To evaluate the surface roughness of IPS Empress 2 ceramic when treated with different finishing/polishing protocols. MATERIALS AND METHODS Sixteen specimens of IPS Empress 2 ceramic were made from wax patterns obtained using a stainless steel split mold. The specimens were glazed (Stage 0-S0, control) and divided into two groups. The specimens in Group 1 (G1) were finished/polished...

OBJECTIVES CAD-CAM system is popular because of high esthetic and short fabrication time. But, there is limited information available about the microtensile bonding of luting cements to CAD-CAM inlays and to dentin. The aim of this study was to examine the bond strength of CAD-CAM (Cerec 3) and pressed-ceramic (IPS Empress 2) inlays to dentin surface by microtensile testing using two luting cem...

This study evaluated the irradiance of curing units through core and veneered hot-pressed ceramics as well as the transmittance of these materials. Discs of 0.7, 1.4 and 2 mm in thickness of Empress (EMP) and Empress Esthetic (EST), and 0.8 (n=5) and 1.1 mm (n=5) thickness of Empress 2 (E2) were obtained. For E2, two of the 0.8-mm-thick discs were covered with dentin (1.2- and 1.4-mm-thick) and...

A leucite-reinforced glass ceramic material (IPS-Empress) which had shown for indirectly fabricated inlays and onlays an encouraging 2-year survival rate of 97.5% in a prospective clinical trial was introduced for clinical use at the University of Zürich. The aim of the present study was to assess the clinical behavior of IPS-Empress inlays and onlays with respect to possible fatigue phenomena ...

Amaç: Yeni nesil metal desteksiz dental seramiklerin uzun süreli biyouyumluluğu ile ilgili olarak oldukça az bilgi mevcuttur. Bu çalışmanın amacı, farklı dental seramiklerin gingival fibroblast canlılığına olan etkisini değerlendirmektir. Gereç ve Yöntem: İnsan gingival fibroblastı, 2 farklı feldspathic seramiğe (Vita Omega ve Ivoclar), bir lithium disilicate preslenebilir seramiğe (Empress-2) ...

OBJECTIVES Effect of a dentin adhesive system containing antibacterial monomer-MDPB (Clearfil Protect Bond) on the shear bond strength of all-ceramic-IPS Empress 2 restorations luted with three different dual-polymerizing systems (Variolink 2, RelyX ARC and Panavia F 2.0) to dentin was investigated. METHODS One hundred and eight all-ceramic discs (2 x 3mm; IPS Empress 2) were fabricated and u...