All‐ceramic fixed partial dentures designed according to the DC‐Zirkon® technique. A 2‐year clinical study

Abstract

The aim of the study was to investigate whether the properties of a pre-sintered, hot isostatic post-compacted (HIP) ZrO2 are adequate for use in three-five-unit fixed partial dentures (FPDs) and to evaluate the clinical results. Twenty three-five-unit FPDs were fabricated for 18 patients on a total of 56 abutments. They were all made on abutments cut with a shoulder preparation and cemented with a zinc phosphate cement. They were clinically followed for 24 months. After 24 months all FPDs were still in use without any fractures or clinical wear but in three cases (15%) minor chip-of fractures were observed. Marginal integrity was rated excellent at 45 abutments and acceptable at 11. Within the limitations of this 2-year clinical follow-up study, FPDs made of pre-sintered HIP ZrO2 core material veneered with a compatible ceramic is an acceptable alternative in the fabrication of FPDs with the extensions investigated in this study. Special attention, however, must be paid to designing the core for an occlusal shape that provides sufficient support for the veneer.

Digital dentistry: an overview of recent developments for CAD/CAM generated restorations

“…In recent years, CAD/CAM production has clearly expanded the palette of materials for dental prosthe ses by providing access to new ceramic materials with high dependability. 15,[28][29][30][31] The stability values of zirconium oxide ceramics permit, in many areas of indi cation, the use of this material as an alternative to metal frames for perma nent prostheses. 30 The production of long-term temporary prostheses has, as a result of the use of a virtual wax up on the computer, become faster, more convenient and more pre dictable.…”

“…15,[28][29][30][31] The stability values of zirconium oxide ceramics permit, in many areas of indi cation, the use of this material as an alternative to metal frames for perma nent prostheses. 30 The production of long-term temporary prostheses has, as a result of the use of a virtual wax up on the computer, become faster, more convenient and more pre dictable. This method has already been implemented by computer-generated long-term temporary restorations, since it can be modified, by changing the form, to the functional and aesthetic sat isfaction of the patient during a clinical test phase.…”

“…On the basis of present knowledge, a tapered angle of between 4° to 10° is recom mended. 30 Subsections and irregularities on the surface of the prepared tooth as well as the 'creation of troughs' with a reverse bevel preparation margin can be inadequately recognised by many scan ners (Fig. 6).…”

Evaluation of flexural strength of hipped and presintered zirconia using different estimation methods of Weibull statistics

“…Zirconia has high flexural strength, fracture toughness and elasticity modulus (Evans, 1990;Filser et al, 2001;Sturzenegger et al, 2001;Lüthy et al, 2005;Fischer and Stawarczyk, 2007) and is highly biocompatible (Piconi and Maccauro, 1990). Clinical studies reported also high survival rate of zirconia frameworks but more failures of veneering ceramic (Vult von Steyern et al, 2005;Raigrodski et al, 2006;Sailer et al 2007;Edelhoff et al 2008;Schmitt et al, 2009). …”

Comparison of four monolithic zirconia materials with conventional ones: Contrast ratio, grain size, four-point flexural strength and two-body wear

“…For this, dental materials with tooth-like optical properties such as ceramics are preferred. Oxide ceramics, particularly zirconia, are gaining attention because of their good biocompatibility, high strength and excellent load-bearing capacity (Piconi et al, 1999;Sailer et al, 2006;Vult von Steyern et al, 2005) .…”