Publications by authors named "Muhamad Ghazal"
Purpose: To evaluate the condylar displacement after mounting working casts using different interocclusal recording materials and to analyze the influence of the storage time and the recording technique on the displacement caused by the interocclusal record.
Materials And Methods: Eight interocclusal records were made in each of the following groups: G1: Aluwax (aluminum wax), G2: Beauty Pink wax (hydrocarbon wax compound), G3: Futar D Fast, G4: Futar Scan (G3, G4: vinylpolysiloxane), G5: Ramitec (polyether), G6: LuxaBite (composite resin based on bis-acryl), G7: LuxaBite corrected with Aluwax. A condylar-positioning indicator measured the condylar displacement in the three planes after storage of the records for two periods of 1 and 48 hours.
Long-term retention behaviour of resin matrix attachment systems for overdentures.
J Mech Behav Biomed Mater
April 2016
Objectives: The purpose of this laboratory study was to evaluate the long-term retention behaviour of two resin matrix attachment systems for overdentures and the influence of the implant angulation.
Methods: Sixteen titanium patrices of each attachment system were connected to their corresponding implant analogues and fixed in an auto curing resin either orthogonally (n=8) or 20° tilted (n=8). The corresponding matrices, one made from polyetherketoneketone (PEKK; CM LOC, Cendres+Métaux, Biel, Switzerland), one made from polyethylene (PE; Locator, Zest Anchors, Escondido, California, USA), were fixed in a stylised unilaterally removable dental prosthesis resulting in 4 groups with 8 specimens in each group.
Statement Of Problem: Little is known about the wear behavior of ceramics opposed to unveneered zirconia and whether wear varies according to microstructure, surface toughness, and flexural strength of the ceramics.
Purpose: The purpose of this study was to evaluate the 2-body wear resistance of 5 ceramics opposing unveneered zirconia ceramic.
Material And Methods: Yttrium-stabilized zirconia, lithium disilicate glass ceramic, leucite-reinforced glass ceramic, fluorapatite glass ceramic, and nanofluorapatite glass ceramic specimens (n=8) were tested against standardized zirconia balls.
Purpose: To assess the retention of glass FRC posts luted with resin cements after conditioning the canal dentin with different acidic treatments.
Methods: Post spaces were prepared in six groups of eight endodontically treated extracted teeth. Glass FRC posts were luted after etching the canal dentin with phosphoric acid and/or applying ED-Primer, Clearfil New Bond or XP Bond.
Objectives: To evaluate the wear resistance of artificial denture teeth and their human enamel antagonists in a dual-axis chewing simulator.
Method And Materials: Four artificial denture teeth--feldspathic ceramic, nanofilled composite resin, experimental acrylic resin with UDMA/PMMA, and interpenetrating polymer networks (IPN) acrylic resin teeth--were tested in this study. Human enamel cusps were used as antagonists.
Influence of loading forces on the vertical accuracy of interocclusal records.
Quintessence Int
February 2010
Objective: To evaluate the influence of loading forces on the vertical discrepancies caused by interocclusal recording materials.
Method And Materials: A custom-made apparatus was used to simulate the maxilla and mandible. Eight interocclusal records were made in each of the following groups: G1-Aluwax (aluminum wax; Aluwax), G2-Beauty Pink wax (hydrocarbon wax compound; Miltex), G3-Futar D, G4-Futar D Fast, G5-Futar Scan (polyvinyl siloxanes; Kettenbach), and G6-Ramitec (polyether; 3M ESPE).
Statement Of Problem: Several post surface treatments with or without the application of a bonding agent have been recommended to improve the bond strength of resin cements to posts. A regimen that produces the maximum bond strength of glass fiber-reinforced composite resin posts has not been verified.
Purpose: The purpose of this study was to evaluate the influence of post surface conditioning methods and artificial aging on the retention and microleakage of adhesively luted glass fiber-reinforced composite resin posts.
Statement Of Problem: Depending on the applied finishing technique, ceramics may have different values of surface roughness; therefore, their abrasive effect on antagonists may vary. However, different materials may be affected differently by the surface roughness of ceramics.
Purpose: The purpose of the present study was to evaluate and correlate the wear of human enamel and nanofilled composite resin teeth with the surface roughness of the antagonistic ceramic after simulated mastication.
Objective: To evaluate 4 interocclusal recording materials for their ability to reproduce accurately interocclusal relationships after a storage time of 1 or 48 hours.
Method And Materials: A custom-made metal apparatus was used to simulate the maxilla and mandible. The vertical discrepancies were measured by a precision dial gauge.
The aim of this study was to evaluate the wear of denture teeth and their antagonists produced by two-body and three-body wear tests. Three types of denture teeth, namely feldspathic ceramic (FC), nano-filled composite resin (NCR), and experimental acrylic resin teeth (AR), were tested. For each type two groups of eight upper premolars each were prepared.
View Article and Find Full Text PDFStatement Of Problem: The wear resistance of nanofilled composite resin and feldspathic ceramic artificial teeth may vary according to the material type and physical characteristics of the antagonist.
Purpose: The purpose of this study was to evaluate the wear resistance of nanofilled composite resin and feldspathic ceramic artificial teeth after simulated mastication against steatite, zirconia, and alumina antagonists.
Material And Methods: The study evaluated 6 groups of artificial teeth: 3 groups of 8 nanofilled composite resin teeth (Condyloform II NFC) and 3 groups of 8 feldspathic ceramic teeth (Bonartic CT).
Statement Of Problem: The smear layer covering root canal dentin as a result of post space preparation procedures may negatively affect the retention of adhesively cemented glass fiber-reinforced resin posts.
Purpose: The purpose of this study was to evaluate the retention of airborne-particle-abraded glass fiber posts luted with 3 different bonding systems after conditioning the canal dentin with acidic conditioning methods.
Material And Methods: Post spaces were prepared in 6 groups of 8 endodontically treated single-rooted teeth.
This study aimed to evaluate the wear resistance of artificial teeth when opposed by antagonists made from the same material. The artificial teeth tested included ceramic teeth, nanofilled composite resin teeth, acrylic resin teeth, and experimental acrylic resin teeth. After 600,000 chewing cycles, the mean total vertical substance loss and mean volume loss for acrylic resin and experimental acrylic resin teeth were significantly lower than for ceramic and composite resin teeth.
View Article and Find Full Text PDFObjectives: To evaluate the two-body wear resistance of different artificial denture teeth when opposed to steatite ceramic balls in a dual-axis chewing simulator.
Methods: Artificial denture teeth including the ceramic tooth Bonartic CT, the composite resin tooth Condyloform II NFC, the acrylic resin teeth Bonartic TCR, Orthognath, Polystar Selection, SR Orthotyp DCL, and Vitapan Cuspiform, and human maxillary premolars were tested in a chewing simulator. Wear resistance was analyzed measuring vertical substance loss and volume loss using profilometry and an optical macroscope after various chewing cycles (49N, up to 1,200,000 cycles).