Retrieved Bone Screw Made From Co-Cr-Mo Alloy with Casting Defects

SummaryThe purpose of the study was to determine and to compare the in vitro pullout strength of 5.5 mm cortical versus 6.5 mm cancellous bone screws inserted in the diaphysis and metaphysis of foal third metacarpal (MCIII) bones in threaded 4.5 mm cortical bone screw insertion holes that were then overdrilled with a 4.5 mm drill bit. This information is relevant to the selection of a replacement screw if a 4.5 mm cortical screw is stripped during orthopaedic surgery. In vitro pullout tests were performed in two independent cadaver studies, each consisting of 12 foal MCIII bones. Two 4.5 mm cortical screws were placed either in the mid-diaphysis (study 1) or distal metaphysis (study 2) of MCIII bones. The holes were then overdrilled with a 4.5 mm bit and had either a 5.5 mm cortical or a 6.5 mm cancellous screw inserted; screw pullout tests were performed at a rate of 0.04 mm/s until screw or bone failure occurred.The bone failed in all of the tests in the diaphyseal and metaphyseal bone. The holding power for 6.5 mm cancellous screws was significantly (p <0.05) greater than for 5.5 mm cortical screws in both the diaphysis and metaphysis. There was not any difference in the holding power of screws in either the diaphysis or the metaphysis between proximal and distal screw holes.If a 4.5 mm cortical bone screw strips in MCIII diaphyseal or metaphyseal bone of foals, a 6.5 mm cancellous screw would provide greater holding power than a 5.5 mm cortical screw.In order to provide information regarding selection of a replacement screw if a 4.5 mm cortical screw is stripped, the in vitro pullout strength was determined for 5.5 mm cortical and 6.5 mm cancellous screws inserted in third metacarpal diaphyseal and metaphyseal bone of foals in which threaded 4.5 mm cortical bone screw insertion holes had been overdrilled with a 4.5 mm bit. The holding power of the 6.5 mm cancellous screw was significantly greater than the 5.5 mm cortical screw in both the diaphysis and metaphysis of foal third metacarpal bone. Thus, it appears that if a 4.5 mm cortical screw is stripped during orthopaedic surgery in foals, a 6.5 mm cancellous screw would provide superior holding power.

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The “Mixing” of Implant Systems

Veterinary and Comparative Orthopaedics and Traumatology ◽

10.1055/s-0038-1633250 ◽

1991 ◽

Vol 4 (02) ◽

pp. 38-45 ◽

Cited By ~ 1

Author(s):

F. Baumgart

Keyword(s):

Stainless Steel ◽

Additional Risk ◽

Bone Screw ◽

Application Technique ◽

Quality Controls ◽

Implant Materials ◽

Osteosynthesis Plate ◽

Potential Problems ◽

Manufacturing Procedure

SummaryThe so-called “mixing” of implants and instruments from different producers entertain certain risks.The use of standardized implant materials (e.g. stainless steel ISO 5832/1) from different producers is necessary but is not sufficient to justify the use of an osteosynthesis plate from one source and a bone screw from another.The design, dimensions, tolerances, manufacturing procedure, quality controls, and application technique of the instruments and implants also vary according to make. This can lead to damage, failure or fracture of the biomechanical system called “osteosynthesis” and hence the failure of the treatment undertaken. In the end, it is the patient who pays for these problems.Some examples also illustrate the potential problems for the staff and institutions involved.The use of a unique, consistent, well-tested, and approved set of implants and instruments is to be strongly recommended to avoid any additional risk.

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INVESTIGATION AND ANALYSIS OF METAL CASTING DEFECTS BY USING QUALITY CONTROL TOOLS

10.26488/iej.11.5.1067 ◽

2018 ◽

Vol 11 (5) ◽

Author(s):

Shubham Sharma ◽

Vikas Ucharia ◽

Chetan Sharma ◽

Rupinder Singh Kanwar

Keyword(s):

Quality Control ◽

Metal Casting ◽

Casting Defects

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Error determination of hidden flows by hydrostatic weighing in parts obtained by casting

Blanking productions in mechanical engineering (press forging, foundry and other productions) ◽

10.36652/1684-1107-2020-18-8-339-342 ◽

2020 ◽

pp. 339-342

Author(s):

M.S. Razumov ◽

P.V. Glazkov ◽

V.S. Kochergin ◽

A.S. Byshkin

Keyword(s):

Theoretical Calculations ◽

Casting Defects ◽

Casting Method ◽

Error Determination ◽

Hydrostatic Weighing ◽

Weighing Method ◽

Hydrostatic Weighing Method

The existing methods for detecting of casting defects and their disadvantages are considered. Hydrostatic weighing method is proposed for detecting of hidden fl aws by comparing the reference and calculated densities of the casting, method for calculating of the error is recommended. The adequacy of theoretical calculations is verifi ed experimentally

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Correction of Class II Skeletal Malocclusion with an Infra- Zygomatic Crest Bone Screw Approach

Indian Journal of Public Health Research & Development ◽

10.37506/v10/i12/2019/ijphrd/192374 ◽

2019 ◽

Vol 10 (12) ◽

pp. 2386

Author(s):

A. Arif Yezdani ◽

Priya Chatterjee ◽

S. Kishore Kumar ◽

Kesavaram Padmavathy

Keyword(s):

Class Ii ◽

Bone Screw ◽

Skeletal Malocclusion

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Research on Automatic Recognition of Casting Defects Based on Deep Learning

IEEE Access ◽

10.1109/access.2020.3048432 ◽

2020 ◽

pp. 1-1

Author(s):

Liming Duan ◽

Ke Yang ◽

Lang Ruan

Keyword(s):

Deep Learning ◽

Automatic Recognition ◽

Casting Defects

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The application of an allogeneic bone screw for osteosynthesis in hand and foot surgery: a case series

Archives of Orthopaedic and Trauma Surgery ◽

10.1007/s00402-021-03880-6 ◽

2021 ◽

Author(s):

Klaus Pastl ◽

Wolfgang Schimetta

Keyword(s):

Healing Process ◽

Case Series ◽

Clinical Importance ◽

Fusion Rate ◽

Surrounding Tissue ◽

Allogeneic Bone ◽

Foot Surgery ◽

Bone Screw ◽

Transplant Failure

Abstract Introduction The allogeneic bone screw transplant is a new osteosynthesis device making the use of foreign fixation material obsolete for various kinds of indications. Moreover, it is integrated into the recipient bone by natural bone remodeling without harming the surrounding tissue. The aim of this study was to determine the efficacy and safety of the transplant for osteotomy and arthrodesis in hand and foot surgery and to evaluate the clinical importance of the device. Materials and methods A single-surgeon case series of 32 patients who had undergone hand or foot surgery with the application of an allogeneic bone screw with an average follow-up time of 1 year is reported. Clinical data were reviewed to evaluate the pain levels and satisfaction of the patients and the frequency and type of complications occurring during the healing process. Routine radiography and computed tomography were reviewed to determine the fusion rate, the ingrowth behavior of the transplant and the possible occurrence of transplant failure. Results High patient satisfaction was paired with low postoperative pain levels and a low complication rate. 97% of the patients were free of pain at the timepoint of the second follow-up examination, the mean time of recovery of full mobility was 50.1 ± 26.1 days after surgery. Wound healing disturbance occurred only in two cases. Bony consolidation of the osteotomy or arthrodesis gap as well as osseointegration of the transplant was seen in all cases. No transplant failure or transplant loosening occurred. Conclusions The application of the allogeneic bone screw resulted in a 100% fusion rate while the patient burden was low. The transplant is safe and suited for various kinds of osteosynthesis in hand and foot surgery.

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Numerical Simulation of Filling and Solidification in Sand Casting by Procast

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.791-793.550 ◽

2013 ◽

Vol 791-793 ◽

pp. 550-553 ◽

Cited By ~ 1

Author(s):

Dong Dong Han ◽

Cheng Jun Wang ◽

Juan Chang ◽

Lei Chen ◽

Huai Bei Xie

Keyword(s):

Numerical Simulation ◽

Heat Dissipation ◽

Solidification Process ◽

Simulation Software ◽

Sand Casting ◽

Production Costs ◽

Raw Material ◽

Casting Defects ◽

Three Dimension ◽

Filling And Solidification

At present, pulley produced in China has been able to meet the demand of domestic and international markets. But there are many problem of the pulley industry in our country, such as too many production enterprises and the low level of export products. And as components of drive system are light weight and raw material price of pulley casting are rising, manufacturing requirements of the pulley are also more and more high. Aiming at the casting defects of pulley that enterprise current product, pulley casting blank model of common material HT250 be made by three-dimension software, numerical simulation of filling and solidification process for pulley sand casting by the casting simulation software Procast, the size and location of the various casting defects were forecasted and analyzed, reflecting the pulley filling and solidification process of the actual situation, due to the thicker pulley rim and less heat dissipation, position of shrinkage is close to the middle of rim [, a method of eliminating defects is proposed to realize sequential solidification, and thus to minimize porosity shrinkage and improve casting performance and reduce casting time and reduce production costs.

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