Publications by authors named "Majed Al-Akhali"
Article Synopsis
- The study investigates how ferrule thickness and post materials affect the fracture resistance of endodontically treated mandibular premolars.
- It involved 64 extracted teeth divided into four groups based on ferrule thickness and restored with either glass fiber or titanium posts.
- Results showed that thicker ferrules (up to 1.5 mm) significantly increased fracture resistance, while the type of post material did not have a notable impact.
Article Synopsis
- - The study aimed to investigate how different factors like post length, material, and substance loss affect the strength of endodontically treated mandibular premolars.
- - Researchers tested 96 extracted premolars, dividing them into 12 groups based on the number of residual walls, post material (glass-fiber or titanium), and post length.
- - Results showed titanium posts provided significantly better fracture resistance than glass-fiber posts, especially when the post length was 7.5 mm.
Purpose: The purpose of this study was to assess the effect of aging and alumina-particle air abrasion at different pressures on the bond strength of two luting composites to a translucent 3Y-TZP zirconia.
Materials And Methods: Half of the 192 disk-shaped zirconia specimens were aged in an autoclave (group A) for 20 h (134°C, 2 bar), and the other half was not aged (group N). For each group, a different surface treatment was applied: as-sintered (group SIN), alumina-particle air abrasion either at 1 bar (group 1B) or at 2.
Objective: The airborne-particle abrasion of zirconia with alumina particle (APA) has been reported to result in the durable bonding of appropriate adhesive luting systems. However, whether a delay between APA and the application of the adhesive luting material might affect the resulting bond strength and its durability is unknown.
Methods: A total of 140 disc-shaped zirconia specimens were divided according to the elapsed time between the APA of zirconia and its bonding into 5 test groups (15 min, 1 h, 4 h, 24 h, and 72 h).
Purpose: To evaluate the influence of different cleaning methods on the resin bond strength to contaminated translucent 3Y-TZP ceramic.
Materials And Methods: A total of 133 airborne-particle abraded (0.1 MPa) zirconia specimens were divided into 7 groups.
Influence of Aging on Biaxial Flexural Strength and Hardness of Translucent 3Y-TZP.
Materials (Basel)
December 2019
The purpose of this research was to evaluate the influence of aging and surface treatment on surface roughness, biaxial flexural strength (BFS), and Vickers hardness (VHN) of translucent dental zirconia. Half of 80 disc-shaped zirconia specimens (1.2 mm thickness and 12 mm diameter) were aged (group A) in an autoclave for 20 h (134 °C and 0.
View Article and Find Full Text PDFStatement 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 the oral environment before being recommended for clinical use.
Purpose: To evaluate the influence of thermomechanical fatigue loading on the fracture strength of minimally invasive occlusal veneer restorations fabricated from different CAD-CAM materials and bonded to human maxillary premolars using self-etchnig bonding technique.
Objective: To evaluate the fracture resistance of endodontically treated mandibular premolars restored with glass fiber posts using different luting agents.
Methods: Twenty-four extracted single-rooted mandibular premolars were endodontically treated, and post spaces were prepared to receive fiber posts. They were assigned to three test groups (n=8) according to the type of cement used for the cementation of glass fiber posts: RC group: adhesive resin cement group (etch and rinse), SC group: self-adhesive resin cement group, and GC group: glass ionomer cement group.
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 the type of abutment used and were divided into five groups [Ti: titanium; Zr: zirconia with no metal base; ZrT: zirconia with titanium base; LaT: lithium disilicate abutment with titanium base; and LcT: lithium disilicate hybrid-abutment-crown with titanium base].
Fracture resistance of ceramic and polymer-based occlusal veneer restorations.
J Mech Behav Biomed Mater
October 2017
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 occlusal veneers with a fissure/cusp thickness of 0.5/0.
Statement Of Problem: The whitish color of zirconia (ZrO) abutments offers favorable esthetics compared with the grayish color of titanium (Ti) abutments. Nonetheless, ZrO has greater opacity, making it difficult to achieve natural tooth color. Therefore, lithium disilicate (LaT) abutments have been suggested to replace metal abutments.
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