Publications by authors named "Haider Hasan Jasim"
Purpose: To evaluate the load-to-fracture after mechanical cycling, failure mode, and stress distribution of mandibular first molars restored with monolithic lithium disilicate (LDS) endocrowns and bilayered endocrowns featuring resin-matrix ceramic endocores veneered with cemented LDS.
Methods: Thirty-six mandibular first molars were divided into three groups (n = 12): Group ME (monolithic LDS), Group VE (bilayered VITA Enamic endocore with LDS veneer), and Group CE (bilayered Cerasmart endocore with LDS veneer). After endodontic treatment, standardized preparation, and CAD/CAM fabrication, restorations underwent 250,000 mechanical loading cycles under a 150 N load.
Introduction: The dentistry industry has seen a number of exciting new advancements in recent years, many of which have been made possible by the introduction of automated technologies such as computer-aided design and computer-aided manufacturing (CAD/CAM). Despite the fact that these new approaches simplify the fabrication process in favor of decreased material consumption and improved time efficiency, it is possible that they may have an effect on the prosthesis's fitness, which in turn may affect how long they will last.
Purpose: The purpose of this in vitro study was to evaluate the trueness and fitness of cobalt-chromium (Co-Cr) crown copings fabricated by selective laser melting (SLM), milling, and conventional casting methods.
Objectives: The aim of this study was to compare the effects of two margin designs (shoulderless and slight chamfer) with two occlusal thicknesses on fracture resistance and failure mode of the monolithic zirconia crowns.
Materials And Methods: Forty nickel-chromium dies were duplicated from the previous two prepared teeth using a three-dimensional optical scanner. Nickel-chromium supporting dies were divided into two main groups ( = 20) according to the type of margin design: group A, slight chamfer margin design and group B, shoulderless margin design.
Purpose: The aim of the study was to evaluate and compare the fracture resistance and modes of fracture of monolithic zirconia crowns with two preparation designs.
Materials And Methods: Forty human maxillary first premolar teeth were extracted for orthodontic purposes and divided into two main groups (n=20): Group A: monolithic traditional zirconia; Group B: monolithic translucent zirconia. The groups were further subdivided into two subgroups (n=10): (A1, B1) shoulder margin design; (A2, B2) feather-edge margin design.