In vitro comparison of the holding power of 1.2 mm, 1.5 mm, and 2.0 mm orthopaedic screws in canine radii

2002 ◽  
Vol 15 (02) ◽  
pp. 78-84 ◽  
Author(s):  
R. B. Fitch ◽  
G. E. Pluhar ◽  
M. D. Salman ◽  
S. T. Kudnig
Keyword(s):  
The Other ◽  
Testing System ◽  
Screw Insertion ◽  
Holding Power ◽  
Pull Out ◽  
External Thread ◽  
Thread Diameter ◽  
Pull Out Strength ◽  
In Vitro Comparison

SummaryThe holding power of miniscrews in canine bone has not been investigated. This report compares the holding power of four different miniscrew types. The screw types tested were: 1.2 mm self-tapping screws, 1.5 mm tapped screws, 2.0 mm self-tapping screws and 2.0 mm tapped screws. They were randomly allocated to canine radius screw sites and screw pull-out strength was determined using a Mechanical Testing System (MIS) machine. The 1.2 mm self-tapping screw had a significantly weaker holding power than the other three screw types. Based upon these findings, the use of the 1.2 mm self-tapping screw cannot be recommended for use in thick cortical bone. There were not any significant differences in holding power of the other three screw types. The performance of the 1.5 mm tapped screws, versus the 2.0 mm tapped screws, was comparable and suggests that the 1.5 mm tapped screw can provide adequate holding power in miniscrew applications. The results were consistent with a linear relationship between the external thread diameter and the holding power.The hypothesis of this study is that these are not any significant differences in the holding power of different miniscrews. We hypothesized that the effects of tapping prior to screw insertion, or using miniscrews of greater external thread diameter, would not provide any increase in the holding power of the screw.

An In Vitro Comparison of Different Cementation Strategies on the Pull-out Strength of a Glass Fiber Post

2009 ◽  
Vol 34 (4) ◽  
pp. 443-451 ◽  
Author(s):  
M. Amaral ◽  
M. F. Santini ◽  
V. Wandscher ◽  
R. Amaral ◽  
L. F. Valandro
Keyword(s):  
Adhesive System ◽  
Resin Cement ◽  
Fiber Post ◽  
Adhesive Resin ◽  
Pull Out ◽  
Glass Fiber Post ◽  
Adhesive Resin Cement ◽  
Pull Out Strength ◽  
In Vitro Comparison

Clinical Relevance A three-step etch&rinse adhesive system, combined with a dual-cured resin cement and a simplified self-adhesive resin cement, appears to be a good strategy for fiber post cementation.

Pullout Strength of Screws in Foal Third Metacarpal Bone after Overdrilling a 4.5 mm Hole

1998 ◽  
Vol 11 (04) ◽  
pp. 200-204 ◽  
Author(s):  
K. Kelly ◽  
G. S. Martin ◽  
D. J. Burba ◽  
S. A. Sedrish ◽  
R. M. Moore
Keyword(s):  
Cortical Bone ◽  
Metacarpal Bone ◽  
Pullout Strength ◽  
Cancellous Screw ◽  
Bone Screw ◽  
Screw Insertion ◽  
Holding Power ◽  
Cortical Screw ◽  
Metaphyseal Bone

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.

A Head-to-Head Comparison of Hydrogen Peroxide Vapor and Aerosol Room Decontamination Systems

2011 ◽  
Vol 32 (9) ◽  
pp. 831-836 ◽  
Author(s):  
T. Holmdahl ◽  
P. Lanbeck ◽  
M. Wullt ◽  
M. H. Walder
Keyword(s):  
Hydrogen Peroxide ◽  
Cycle Time ◽  
New Technologies ◽  
Biological Indicators ◽  
The Other ◽  
Test Room ◽  
Cycle Times ◽  
Hydrogen Peroxide Vapor ◽  
In Vitro Comparison

Objective.New technologies have emerged in recent years for the disinfection of hospital rooms and equipment that may not be disinfected adequately using conventional methods. There are several hydrogen peroxide–based area decontamination technologies on the market, but no head-to-head studies have been performed.Design.We conducted a head-to-head in vitro comparison of a hydrogen peroxide vapor (HPV) system (Bioquell) and an aerosolized hydrogen peroxide (aHP) system (Sterinis).Setting.The tests were conducted in a purpose-built 136-m3test room.Methods.One HPV generator and 2 aHP machines were used, following recommendations of the manufacturers. Three repeated tests were performed for each system. The microbiological efficacy of the 2 systems was tested using 6-log Tyvek-pouchedGeobacillus stearo-thermophilusbiological indicators (BIs). The indicators were placed at 20 locations in the first test and 14 locations in the subsequent 2 tests for each system.Results.All BIs were inactivated for the 3 HPV tests, compared with only 10% in the first aHP test and 79% in the other 2 aHP tests. The peak hydrogen peroxide concentration was 338 ppm for HPV and 160 ppm for aHP. The total cycle time (including aeration) was 3 and 3.5 hours for the 3 HPV tests and the 3 aHP tests, respectively. Monitoring around the perimeter of the enclosure with a handheld sensor during tests of both systems did not identify leakage.Conclusion.One HPV generator was more effective than 2 aHP machines for the inactivation ofG. stearothermophilusBIs, and cycle times were faster for the HPV system.

Pull-out strength of orthopaedic screws in polymethylmethacrylate filled medullary cavities of foal third metacarpal bones

2004 ◽  
Vol 17 (03) ◽  
pp. 136-140
Author(s):  
G. S. Martin ◽  
M. S. Gill ◽  
G. A. Sod
Keyword(s):  
Fracture Site ◽  
Medullary Cavity ◽  
Pull Out ◽  
Metacarpal Bones ◽  
Cavity Filling ◽  
The Mean ◽  
Stable Internal Fixation ◽  
Empty Control ◽  
Pull Out Strength

SummaryThe purpose of this study was to determine the in vitro pull-out force and strength of 4.5-mm and 5.5-mm cortical screws inserted in the diaphysis of foal third metacarpal bones with and without polymethylmethacrylate (PMMA) filling the medullary cavity. Filling the medullary cavity with PMMA significantly increased the pull-out force of 4.5-mm screws by 2.0-fold, and 5.5-mm screws by 2.2-fold, compared to controls (p < 0.001). Also the mean pull-out strength per mm of bones filled with PMMA was significantly greater (p < 0.001) than empty control bones. Our results suggest that filling the medullary cavity with PMMA at sites of greater stress, such as the ends of the plate and near the fracture site, may result in a more stable internal fixation.

scholarly journals The Stability of Temporary Restorations Fabricated on a Healing Cap for Immediate Loading: An In Vitro Study

2018 ◽  
Vol 8 (11) ◽  
pp. 2261
Author(s):  
Sangho Jun ◽  
Hyonseok Jang ◽  
Enji Cheon ◽  
MinJu Kim ◽  
Sungwon Ju ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Load Distribution ◽  
In Vitro Study ◽  
Bite Force ◽  
Immediate Loading ◽  
Pull Out ◽  
The Stability ◽  
Implant Treatment ◽  
Pull Out Strength

The aim of this study was to analyze the load distribution of interim restorations using healing cap during immediate loading implant treatment in vitro. A total of 29 models with interim restorations which were fabricated with healing cap were selected. The pull-out strength was measured with a used healing cap and new healing cap. The compressive strength and sinking distance were also measured. The pull-out strength of interim restoration showed lower value (max. 29.8 N) compared to the natural bite force. The sinking amounts were larger than normal tooth sinking. The sinking amounts of interim restorations fabricated on a healing cap were roughly 3 times (0.3–0.5 mm under 450 N) those of normal teeth. The interim restoration on plastic healing cap would be useful for immediate loading implant treatment.

scholarly journals In vitro biomechanical study of pedicle screw pull-out strength based on different screw path preparation techniques

2016 ◽  
Vol 50 (2) ◽  
pp. 177 ◽  
Author(s):  
Mark Moldavsky ◽  
Kanaan Salloum ◽  
Brandon Bucklen ◽  
Saif Khalil ◽  
JwalantS Mehta
Keyword(s):  
Pedicle Screw ◽  
Biomechanical Study ◽  
Pull Out ◽  
Strength Based ◽  
Preparation Techniques ◽  
Pull Out Strength

scholarly journals Correlation between the Computed Tomography Values of the Screw Path and Pedicle Screw Pullout Strength: An Experimental Study in Porcine Vertebrae

2020 ◽  
Vol 14 (3) ◽  
pp. 265-272
Author(s):  
Atsushi Ikeura ◽  
Taketoshi Kushida ◽  
Kenichi Oe ◽  
Yoshihisa Kotani ◽  
Muneharu Ando ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Bone Mineral Density ◽  
Pedicle Screw ◽  
Bone Mineral ◽  
Lumbar Vertebrae ◽  
Pedicle Screws ◽  
Mineral Density ◽  
Screw Insertion ◽  
Pull Out ◽  
Pull Out Strength

Study Design: Biomechanical study.Purpose: To assess the correlation between the computed tomography (CT) values of the pedicle screw path and screw pull-out strength.Overview of Literature: The correlation between pedicle screw pull-out strength and bone mineral density has been well established. In addition, several reports have demonstrated a correlation between bone mineral density and CT values. However, no previous biomechanical studies investigated the correlation between CT values and pedicle screw pull-out strength.Methods: Sixty fresh-frozen lumbar vertebrae from 6-month-old pigs were used. Before screw insertion, the CT values of the screw path were obtained for each sample. Specimens were then randomly divided into three equal groups. Each group had one of three pedicle screws inserted: 4.0-mm LEGACY (4.0-LEG), 4.5-mm LEGACY (4.5-LEG), or 4.5-mm SOLERA (4.5-SOL) (all from Medtronic Sofamor Danek Inc., Memphis, TN, USA). Each screw had a consistent 30-mm thread length. Axial pull-out testing was performed at a rate of 1.0 mm/min. Correlations between the CT values and pedicle screw pull-out strength were evaluated using Pearson’s correlation coefficient analysis.Results: The correlation coefficients between the CT values of the screw path and pedicle screw pull-out strength for the 4.0-LEG, 4.5-LEG, and 4.5-SOL groups were 0.836 (<i>p</i> <0.001), 0.780 (<i>p</i> <0.001), and 0.873 (<i>p</i> <0.001), respectively. Greater CT values were associated with greater screw pull-out strength.Conclusions: The CT values of the screw path were strongly positively correlated with pedicle screw pull-out strength, regardless of the screw type and diameter, suggesting that the CT values could be clinically useful for predicting pedicle screw pull-out strength.

Axial pull-out strength of 3.5 cortical and 4.0 cancellous bone screws placed in canine proximal tibias using manual and power tapping

2008 ◽  
Vol 21 (04) ◽  
pp. 323-328 ◽  
Author(s):  
M. E. Soniat ◽  
S. Elder ◽  
R. McLaughlin ◽  
J. L. Demko
Keyword(s):  
Cancellous Bone ◽  
Testing Machine ◽  
Bone Screws ◽  
Materials Testing ◽  
Pull Out ◽  
Cortical Width ◽  
Bone Width ◽  
Significant Difference ◽  
Pull Out Strength

SummaryAn in vitro experimental cadaveric mechanical testing study was performed using 20 radiographically mature dogs, weighing between 18–33 kg. The aim of the study was to compare the axial pull-out strength of 3.5 mm cortical and 4.0 mm cancellous bone screws inserted in the canine proximal tibia using manual and power tapping techniques. 3.5 cortical and 4.0 cancellous bone screws were inserted in canine cadaver proximal tibiae using a manual or power tapping technique. The screws were extracted using a servohydraulic materials testing machine in order to measure axial pullout strength. Axial pull-out strength was recorded relative to the total bone width and total cortical width of each tibia. The mean axial pull-out strength for all constructs was 717.8±56.5 N without any statistically significant difference among groups (p=0.4183). The groups were equal in animal body weight, cortical width and total bone width (p=0.2808). The axial pull-out strength in proportion to cortical and total bone width was not significantly different among groups (p=0.5318). Axial pull-out strengths of 3.5 mm cortical and 4.0 mm cancellous bone screws inserted in the proximal tibial metaphysis were not significantly different. Axial pull-out strength was not affected by the use of power tapping in either screw type.

Porous membranes of quaternized chitosan composited with strontium-based nanobioceramic for periodontal tissue regeneration

2021 ◽  
pp. 088532822110502
Author(s):  
Adarsh Rajeswari Krishnankutty ◽  
Shamna Najeema Sulaiman ◽  
Arun Sadasivan ◽  
Roy Joseph ◽  
Manoj Komath
Keyword(s):  
Tensile Strength ◽  
Tissue Regeneration ◽  
Porous Membrane ◽  
Periodontal Ligament Cells ◽  
Porous Membranes ◽  
Pull Out ◽  
Periodontal Tissue Regeneration ◽  
Phosphate Buffered Saline ◽  
Pull Out Strength

This report demonstrates the development of a degradable quaternary ammonium derivative of chitosan (QC) composited with strontium-containing nanoapatite (SA) for bioactivity. The material was made as porous membrane by solution casting and freeze drying, for guided tissue regeneration (GTR) applications. The micromorphology, tensile strength, suture pull-out strength, degradation ( in vitro, in phosphate buffered saline), and cytocompatibility (using human periodontal ligament cells) were tested to investigate the effect of derivatization and SA addition. The porosity of the membranes increased with increasing SA content and so did the tensile strength and the degradation. The suture pull-out strength, however, showed a decrease. The cell culture evaluation endorsed biocompatibility. The composite with 1.5 mg SA per 1 mL QC was found to have optimal qualities for GTR applications.

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