Ceramics Research Today is a free monthly online journal that collates and summarizes the latest research about Ceramics, including details on dentistry, restoration, benefits.

Metal neck and liner impingement in ceramic bearing total hip arthroplasty.

Lee YK, Yoo JJ, Koo KH, Yoon KS, Kim HJ

Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul, Korea.

Although impingement between the neck of the metallic stem and the ceramic liner has been suspected to be the cause of ceramic liner failure in ceramic-on-ceramic total hip arthroplasty (THA), no report has directly demonstrated microscopic damage on ceramic liner. We performed 18 reoperations on 18 patients who had undergone third generation ceramic-on-ceramic THA. Considering impingement, 16 patients, who were reoperated more than 1 year after previous ceramic bearing THA, were evaluated. Retrieved alumina liners, showing evidence of impingement, were examined by means of visual inspection and scanning electron microscopy (SEM). Four of the 16 hips showed neck notching and black stained liners, evidence of metallic neck to ceramic impingement. Impinged alumina bearings had been implanted for an average of 62.5 months (range: 35-99 months) before reoperation. SEM of the black stained area demonstrated disruptive wear and loss of surface integrity. Furthermore, one liner had multiple microcracks, and its cross-sectional SEM analysis revealed one microcrack propagating into the deep portion of the ceramic liner. Our observations suggest that metal neck-to-ceramic impingement in ceramic-on-ceramic THA can cause microcrack formation in ceramic liner.

Published 24 December 2010 in J Orthop Res, 29(2): 218-22.
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Articles on Ceramics published 24 December 2010:

Metal neck and liner impingement in ceramic bearing total hip arthroplasty.   J Orthop Res, 29(2): 218-22.

Although impingement between the neck of the metallic stem and the ceramic liner has been suspected to be the cause of ceramic liner failure in ceramic-on-ceramic total hip arthroplasty (THA), no report has directly demonstrated microscopic damage on ceramic liner. We performed 18 reoperations on 18 patients who had undergone third generation ceramic-on-ceramic THA. Considering impingement, 16 patients, who were reoperated more than 1 year after previous ceramic bearing THA, were evaluated. ... [Abstract] [Full-text]

Articles on Ceramics published 24 November 2010:

Crystallization of high-strength fine-sized leucite glass-ceramics.   J Dent Res, 89(12): 1510-6.

Manufacturing of leucite glass-ceramics often leads to materials with inhomogeneous microstructures. Crystal-glass thermal mismatches which produce microcracking around larger crystals-agglomerates are associated with reduced mechanical properties. The hypotheses were that fine (< 1 µm) crystal size and uniform microstructure in a thermally matched glass would increase the biaxial flexural strength (BFS). Glass was synthesized, attritor-milled, and heat-treated. Glasses and glass-ceramics ... [Abstract] [Full-text]

Articles on Ceramics published 8 November 2010:

Recycling of the product of thermal inertization of cement-asbestos for various industrial applications.   Waste Manag, 31(1): 91-100.

Recycling of secondary raw materials is a priority of waste handling in the countries of the European community. A potentially important secondary raw material is the product of the thermal transformation of cement-asbestos, produced by prolonged annealing at 1200-1300 °C. The product is chemically comparable to a Mg-rich clinker. Previous work has assured the reliability of the transformation process. The current challenge is to find potential applications as secondary raw material. Recycling ... [Abstract] [Full-text]

Recycling of the product of thermal inertization of cement-asbestos for various industrial applications.   Waste Manag, 31(1): 91-100.

Recycling of secondary raw materials is a priority of waste handling in the countries of the European community. A potentially important secondary raw material is the product of the thermal transformation of cement-asbestos, produced by prolonged annealing at 1200-1300 °C. The product is chemically comparable to a Mg-rich clinker. Previous work has assured the reliability of the transformation process. The current challenge is to find potential applications as secondary raw material. Recycling ... [Abstract] [Full-text]

Recycling of the product of thermal inertization of cement-asbestos for various industrial applications.   Waste Manag, 31(1): 91-100.

Recycling of secondary raw materials is a priority of waste handling in the countries of the European community. A potentially important secondary raw material is the product of the thermal transformation of cement-asbestos, produced by prolonged annealing at 1200-1300 °C. The product is chemically comparable to a Mg-rich clinker. Previous work has assured the reliability of the transformation process. The current challenge is to find potential applications as secondary raw material. Recycling ... [Abstract] [Full-text]

Articles on Ceramics published 4 October 2010:

Diode laser debonding of ceramic brackets.   Am J Orthod Dentofacial Orthop, 138(4): 458-62.

INTRODUCTION: Our objective was to investigate the effectiveness of debonding ceramic brackets with a diode laser. METHODS: Two types of ceramic brackets (monocrystalline and polycrystalline) were bonded to bovine maxillary central incisors. The diode laser was applied to brackets in the experimental groups for 3 seconds. Shear bond strength and thermal effects on the pulp chamber were assessed at 2 laser energy levels: 2 and 5 W per square centimeter. Analysis of variance (ANOVA) was used to ... [Abstract] [Full-text]

Articles on Ceramics published 29 September 2010:

Reliability of metalloceramic and zirconia-based ceramic crowns.   J Dent Res, 89(10): 1051-6.

Despite the increasing utilization of all-ceramic crown systems, their mechanical performance relative to that of metal ceramic restorations (MCR) has yet to be determined. This investigation tested the hypothesis that MCR present higher reliability over two Y-TZP all-ceramic crown systems under mouth-motion fatigue conditions. A CAD-based tooth preparation with the average dimensions of a mandibular first molar was used as a master die to fabricate all restorations. One 0.5-mm Pd-Ag and two ... [Abstract] [Full-text]

Articles on Ceramics published 27 September 2010:

Current status of ceramic-based membranes for oxygen separation from air.   Adv Colloid Interface Sci, 160(1): 88-100.

There has been tremendous progress in membrane technology for gas separation, in particular oxygen separation from air in the last 20 years. It provides an alternative route to the existing conventional separation processes such as cryogenic distillation and pressure swing adsorption as well as cheaper production of oxygen with high purity. This review presents the recent advances of ceramic membranes for the separation of oxygen from air at high temperature. It covers the issues and problems ... [Abstract] [Full-text]

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