Adham Elsayed

Enossale Implantate gelten heute als ein Mittel der Wahl, um Zähne zu ersetzen und Funktion, Ästhetik sowie Lebensqualität des Patienten wiederherzustellen. Hierbei können diese als Halteelemente für herausnehmbaren oder als Pfeiler für festsitzenden Zahnersatz dienen. Dieser Artikel beleuchtet die physikalischen Eigenschaften implantatgetragener E...

Aim: To investigate the effect of using different materials for the fabrication of implant abutments and crowns on the mechanical behavior of implant-supported single crowns after artificial aging. The materials were tested in different combinations to reveal whether using stiff or resilient materials as an abutment or a crown material might influ...

Introduction: The aim of this study was to measure the wear progress of three high performance polymers (HPP) materials as well as that of zirconia after artificial aging (simulated 2.5- and 5-year of clinical service with thermo-mechanical loading) and compare it with the well-documented wear of lithium disilicate. Methods: Forty implants were...

Statement of problem Scientific data to support scannable and computer-aided design and computer-aided manufacturing (CAD-CAM)-compatible interocclusal registration materials are lacking. Purpose The purpose of this in vitro study was to evaluate the ability of different registration materials (conventional versus scannable) to record maxillary-ma...

Objective Resin-based materials are gaining popularity in implant dentistry due to their shock absorption capacity. Therefore, the aim of this study was to evaluate the fracture strength and failure mode of resilient materials for both crowns and abutments and compare them to the most widely used materials in different combinations after subjection...

For restoring extensive cavities in severely damaged or decayed posterior teeth, especially those with thin walls, indirect restorations are recommended rather than direct fillings. Regarding indirect restorations for inlays and onlays, composite resin-based CAD/CAM materials are considered to have several advantages over ceramics such as easy manu...

Objective: Single-retainer resin-bonded fixed dental prostheses (RBFDPs) are described as an excellent minimally invasive treatment modality for the replacement of a single missing incisor even in cases of congenitally missing teeth that are often associated with hard and soft tissue defects that need to be properly managed to optimize the estheti...

Objectives To investigate and compare the mechanical and optical properties of novel strength- and color-gradient multilayered zirconia and the impact of conventional and high-speed sintering. Materials and methods Following zirconia materials were analyzed and compared: the high-speed sintered Katana Zirconia Block STML (4Y-TZP, KZC), the convent...

Background The use of polymers in implant dentistry is gaining popularity, as they might have several advantages due to their shock absorption capacity. Purpose The aim of this study was to evaluate the performance and fracture strength of three resilient shock-absorbing polymer-based materials as well as the widely used ceramics as one-piece scre...

Statement of problem: With the development of new computer-aided design and computer-aided manufacturing (CAD-CAM) restorative dental materials, limited data regarding their survival rate and fracture strength are available when they are used as occlusal veneers. Therefore, these materials should be evaluated under conditions similar to those of t...

Objectives: The purpose of the study was to evaluate fracture strength of full-anatomical crowns manufactured from three different types of zirconia with different content of yttrium oxide. Method and materials: A total of 48 specimens were divided into three main groups (n = 16), according to the content of yttrium oxide in the crown material u...

This article describes single-retainer resin-bonded fixed dental prostheses as an excellent minimally invasive alternative to other tooth replacements, and how orthodontic pretreatment with aligners might help to utilise this treatment modality. Two cases are presented in which the required space for the singleretainer resin-bonded fixed dental pro...

Purpose: To investigate the effects of different commercially available computer-aided design/computer-assisted manufacturing (CAD/CAM) materials for fabrication of molar crowns, including polyetheretherketone (PEEK), on the fracture strength and failure mode of custom-made titanium and zirconia abutments after artificial aging. Materials and met...

Purpose: To evaluate the efficacy of different surface treatments on the repair of veneered zirconia ceramics. Materials and methods: Forty-eight zirconia disks were divided into three groups according to the method of surface treatment: polished surface, air abraded, or ground using a special silicon carbide bur (SiC Grinding Bur). All specimen...

Objective: The aim of this study was to test five types of implant restorations using titanium, zirconia and lithium disilicate abutments after being subjected to long-term fatigue loading. Materials and methods: Forty single-tooth implant restorations were assembled on titanium implants (FairTwo; FairImplant). The restorations differed only in...

Purpose: To test the bond strength and durability after artificial aging of so-called universal primers and universal multimode adhesives to lithium disilicate or zirconia ceramics. Materials and methods: A total of 240 ceramic plates, divided into two groups, were produced and conditioned: 120 acid-etched lithium disilicate plates (IPS e.max CA...

Objectives: The purpose of this in vitro study was to evaluate the influence of thermodynamic loading on the durability and fracture resistance behavior of occlusal veneers fabricated from different biomedical dental CAD/CAM materials. Methods: The occlusal surfaces of 64 extracted premolars were prepared in the enamel layer and restored with oc...

Objective: The aim of this laboratory study was to evaluate the horizontal and vertical effects of the polymerization shrinkage of three-unit temporary fixed dental prostheses (FDPs) on the position of the prepared teeth. In addition, the reduction of these effects by using different fabrication techniques was evaluated. Methods: A total of 192...

Statement of problem: The whitish color of zirconia (ZrO2) abutments offers favorable esthetics compared with the grayish color of titanium (Ti) abutments. Nonetheless, ZrO2 has greater opacity, making it difficult to achieve natural tooth color. Therefore, lithium disilicate (LaT) abutments have been suggested to replace metal abutments. Purpose...

Purpose. The purpose of this study was to evaluate the effectiveness of different surface treatments on the repair of veneered zirconia ceramics. Materials and Methods. Forty-eight zirconia discs were divided into three groups according to the method of surface treatment; polished surface, air-abraded or grinded using a special silicon carbide bur...

EINLEITUNG: Aufgrund ihrer überlegenen ästhetischen Eigenschaften werden zahnfarbene Lithium-Disilikat-Abutments verwendet. Dabei können sie entweder getrennt als Abutment und Krone oder zusammen als Hybrid-Abutment-Krone hergestellt werden. Bisher wurde die Bruchfestigkeit vom Lithium-Disilikat-Abutments noch nichtuntersucht. Daher war es das Ziel...