Essam Osman

• CEO at Beirut Arab University

Aim: To compare marginal bone level (MBL) around the abutments in integrated and conventional reciprocation designs in attachment-retained removable partial prosthesis (A-RPP). Materials and methods: Around 14 participants were indiscriminately selected and separated into two groups. For every group, an A-RPP with one of the studied reciprocatio...

This study aimed to compare the effect of different pressures of air particle abrasion 2 and 4 bars before and after sintering with and without zirconia liner on SBS of resin to zirconia Surface. Materials and Materials and Methods: Methods: 54 zirconia cuboids 8×8×3 mm were milled and divided into 6 equal groups (N=9) according to surface treatmen...

Purpose: This study aimed to compare the load to failure and the probability of survival of porcelain fused to zirconia (PFZ) three-unit, implant-supported, fixed dental prostheses (FDPs) to those of indirect composites veneered to either zirconia (CVZ) or milled fiber-reinforced composite (FRC) frameworks under static and fatigue loading. Materi...

Background: Zirconia crowns are highly attractive for clinicians, although have poor translucency when used as single restorations, in addition to unknown effect of resin cement shade on final cemented crown shade. This study aimed to assess effect of resin cement opacity on color replication potential of different zirconia frameworks with target...

Background: To compare the effect of Er:YAG Laser and Air particle abrasion (APA) surface treatments on shear bond strength of Y-TZP to composite resin cuboids in the presence and absence of primer application and salivary contamination. Material and methods: Seventy-two cuboidal shaped specimens 7x7x3 were prepared from Y-TZP using CADCAM, clea...

Purpose: to compare the effect of Er:YAG Laser and Air particle abrasion (APA) surface treatments on shear bond strength (SBS) of Y-TZP to composite resin cuboids in the presence and absence of primer application and salivary contamination. Materials and Methods: Seventy-two cuboidal shaped specimens 7x7x3 were prepared from Y-TZP using CADCAM, cle...

Statement of problem. Although the conventional chemicomechanical cord technique is widely used, packing the cord into the sulcus may cause pain and bleeding. Cordless displacement techniques have been introduced, but a comparison of these systems is lacking. Purpose. The purpose of this clinical study was to evaluate the efficiency and gingival re...

Purpose: To compare between the effect of chair-side and laboratory air particle abrasion (APA) on shear bond strength of different types of zirconia to composite resin. Materials and Methods: Study was divided into 2 groups (n=36): laboratory (L) and chair-side (C) according to APA application methods. Each group was further divided into 3 subgrou...

Purpose: To compare the translucency of 6 different types of ceramic material using three different thicknesses. Materials and methods: Square shaped specimens were cut from different types of ceramics with variable translucencies (e.max CAD HT, e.max CAD LT, ultra-translucency zirconia, top-translucency zirconia, super-translucency zirconia and hi...

purpose: To compare the translucency and fracture resistance of crowns fabricated using 3 different ceramic materials. materials and methods: A human maxillary right premolar was prepared to a 0.4 mm chamfer finish line, with 6 degrees convergence angle and 1.5 mm occlusal clearance. Using industrial silicon (Body Double, Smooth-On), a mold was pou...

Purpose: To compare the color stability and fracture strength of two hybrid ceramic (Suprinity and Enamic) veneers versus Lithium Disilicate ceramic veneers. materials and methods: Thirty freshly extracted maxillary central incisors were divided equally into three groups (n=10): group Em (IPS empress II, Ivoclar Vivadent) as a control, group VS (Su...

Obtaining ideal prosthetic framework design is at times hindered by anatomical limitations in the posterior region that might increase the risk for zirconia restoration fracture. Modification such as increasing the bulk thickness especially in the connector region could result in strengthening the zirconia framework. Three-unit zirconia fixed parti...

Statement of Problem: although zirconia crowns are highly attractive for clinicians, they are too white for an esthetic appearance and have poor translucency when used as single restorations. Purpose: to evaluate the color replication potential of different zirconia based crowns with the target tooth color and to assess the effect of resin cement o...

Purpose: Loss of crestal bone is linked to mobility. As a result, mobile teeth with receded crestal bone are not preferred as abutments and therefore are excluded from the treatment plan. The aim of this study is to find if there is real correlation between crestal bone level and tooth mobility by utilizingcone beam computedtomography and periotest...

This in vivo study evaluated the effects of an in-office Bleaching Zoom gel agent on the surface texture of three contemporary restorative materials; an appropriate bleaching procedure was performed on the specimens of each group. Scanning electron micrographs were produced at 60x, 200x, 1500x, and 2000x magnifications of the respective areas of th...

Statement of problem: there is absence of link between virtual implant planning and manually fabricated surgical guides. Purpose: to design and evaluate a simple technique (San technique) to manually fabricate cast-based surgical guide derived from virtual computer aided design. Materials and methods: Ten partially edentulous patients were selected...

Statement of Problem: Visual shade selection is a subjective process depending on the skill of operator, eye fatigue, lightening conditions along with many other factors. Purpose: To test the difference between the visual and the instrumental shade selection techniques. Materials and methods: Shade selection of maxillary right central incisor of 32...

Statement of problem: Unfavorable crown root ratio is linked to mobility, as a result mobile teeth are excluded from serving as abutments which complicates the treatment plan. Objective: To find if there is true correlation between crown root ratio(C/R) and tooth mobility (TM) by utilizing cone beam computed tomography (CBCT) and periotest. Materia...

Knowledge of a population’s epidemiological situation is vital in planning and provision of dental health services. The present study was undertaken to determine the prevalence of malocclusion and orthodontic treatment need in Syrian children. A randomly selected sample of 200 Syrian children aged between 8 and 13 years was collected from three dif...

The study performed to assess the effect of titanium dioxide using (Photoreactor) with the source of radiation on the color change of the three contemporary dental fillings by composite resin material. The resins were divided into three groups head of considering the type of charge and each group of which is composed of five discs and each disc thi...

In this work, ZnO, and TiO2 (Hombikat UV 100) and TiO2 doped with 0.5 % of Pt, and Pd metals, that prepared by photo deposition method. The bare TiO2 and prepared samples were characterized by powder X-ray diffraction (XRD), UV–vis diffuse reflectance spectra (UV–vis DRS), nitrogen adsorption BET, and atomic force microscopy (AFM) were evaluate the...

Purpose: The dense nonretentive surface of zirconia implants was modified into a nanoporous surface using selective infiltration etching surface treatment. The aim of this study was to investigate the influence of such a nanoporous modified zirconia surface on the attachment of human osteoblasts. Materials and methods: Human osteoblasts were cul...

This study aimed to evaluate the clinical effect of crown margin position and crown material on the periodontal health. 200 patients were examined, half of the patients received all ceramic crowns and the rest received porcelain fused to metal crowns. Contra-lateral tooth of same patient served as control. Teeth restored with supragingival margins...

This study aimed to evaluate the clinical effect of crown margin position and crown material on the periodontal health. 200 patients were examined, half of the patients received all ceramic crowns and the rest received porcelain fused to metal crowns. Contra-lateral tooth of same patient served as control. Teeth restored with supragingival margins...