Copyright © 2010 by The Korean Orthopaedic Association This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Clinics in Orthopedic Surgery • pISSN...

PURPOSE The aim of the present study was to evaluate the fracture resistances of zirconia, cast nickel-chromium alloy (Ni-Cr), and fiber-composite post systems under all-ceramic crowns in endodontically treated mandibular first premolars. MATERIALS AND METHODS A total of 36 extracted human mandibular premolars were selected, subjected to standard endodontic treatment, and divided into three g...

statement of problem: the connector area is the weakest zone of an all-ceramic fixed partial denture (fpd), where most catastrophic failures of the prostheses tend to occur. purpose: the aim of the present study was to assess the effect of the convergence angle of abutments on the fracture resistance of three-unit fixed partial dentures made of ips-empress2. materials and methods: forty extract...

Modern unipolar hip hemiarthroplasty, commonly used for displaced femoral neck fracture, is now modular, with both a variable length cobalt-chromium adapter-sleeve and large femoral head. Patients with these modular components may develop symptomatic trunnion corrosion, with elevated serum metal levels. We report the case of an 82-year-old woman, 5.5 years after a modular unipolar hip hemiarthr...

background and aims. one of the major problems of all-ceramic restorations is their probable fracture under occlusal force. the aim of the present in vitro study was to compare the effect of two marginal designs (chamfer and deep chamfer) on the fracture resistance of all-ceramic restorations, cercon. materials and methods. this in vitro study was carried out with single-blind experimental tech...

High-strength all-ceramic systems for fixed partial dentures (FPDs) is gaining popularity as an alternative to the well established metal-ceramic FPDs. Several new framework materials and technique such as lithium disilicate, aluminum oxide and yttrium tetragonal zirconia polycrystal have been developed with improved strength, marginal discrepancy and esthetics. Since not every all-ceramic syst...

STATEMENT OF THE PROBLEM One disadvantage of cement-retained crowns is the lack of predictable irretrievability. This problem can be overcome through designing a screw access hole in the metal substructure of cement-retained restoration and using porcelain stain to define this area. PURPOSE This study aimed to evaluate the influence of existence of screw access hole on porcelain fracture resi...

STUDY DESIGN This is a retrospective study comparing polyethylene wear between ceramic ball heads and metal ball heads in total hip arthroplasty. BACKGROUND The ceramic-on-polyethylene bearing option has been introduced as an alternative to metal-on-polyethylene to minimize polyethylene wear debris and reduce subsequent osteolysis and aseptic loosening. However, the reported data were debatab...

In my series of total hip replacement, the cemented Ceraver Osteal endoprostheses was used since 1977 in 150 cases, the titanium uncemented screw cup ring with a ceramic core since 1985 in 131 cases and since 1996 a pressfit titanium cup with a pure titanium fibre mesh with ceramic core in 30 cases. The ceramic head was fixed to the stem in all cases through conical sleeving. The titanium femor...

New ceramic materials, like hot-pressed glass ceramics can be used to achieve monolithic full anatomic all-ceramic dental restorations even in the molar areas. Due to the fact that these materials are brittle and susceptible to fracture, the aim of the study was to reveal the fracture behaviour of hot-pressed glass ceramic molar crowns under different loading methods. For the experimental analy...