scholarly journals Effect of Cutting Flute Offset and Surface Treatment on Self-tapping Bone Screw

2021 ◽  
Author(s):  
Changsheng Chen ◽  
Aimin Ji ◽  
Zhonghang Zhao ◽  
Lingjie Fu
Keyword(s):  
Surface Treatment ◽  
Bone Screws ◽  
Insertion Torque ◽  
Pullout Strength ◽  
Bone Material ◽  
Bone Screw ◽  
Study Results ◽  
Comprehensive Performance ◽  
Torsional Properties ◽  
Better Than

Abstract Background: Self-tapping bone screws hard to insert will brings many surgical risks such as damage the bone, screw failure. This study investigated the effect of different cutting flute offset and different surface treatment on the insertion torque and pullout strength for self-tapping bone screws.Methods: Titanium alloy screws with five types cutting flute offset and two types surface treatment, were tested for maximum insertion torque and pullout strength in a simulation cortical bone material. One group of each type surface treatment screws were tested for torsional properties. All tests were principally performed according to bone screws test standard. Results: For two types surface treatment, the insertion torque of design with 0.4mm offset was less than others cutting flute offset (p＜0.05), and the pullout strength of design with 0.2mm offset was bigger than others group (p＜0.05). Compared two surface treatment, the insertion torque of dark anodized screws was less than bead blasted, and the former pullout strength was bigger than the latter screws with the offset from 0mm to 0.4mm(p＜0.05).Conclusions: The study results show that different cutting flute offset design and surface treatment effect on the insertion torque, and the bigger cutting flute offset has the lower inserting resistance, and the comprehensive performance of dark anodized screws were better than bead blasted.

Effect of pilot hole diameter and tapping on insertion torque and axial pullout strength of 4.0-mm cancellous bone screws

2011 ◽  
Vol 72 (12) ◽  
pp. 1660-1665 ◽  
Author(s):  
Kevin A. R. Kunkel ◽  
Jonathan T. Suber ◽  
Patrick D. Gerard ◽  
Michael P. Kowaleski
Keyword(s):  
Cancellous Bone ◽  
Hole Diameter ◽  
Bone Screws ◽  
Insertion Torque ◽  
Pullout Strength ◽  
Pilot Hole

The Effect of Pilot Hole Size on the Insertion Torque and Pullout Strength of Self-Tapping Cortical Bone Screws in Osteoporotic Bone

2008 ◽  
Vol 64 (4) ◽  
pp. 990-995 ◽  
Author(s):  
Suneel Battula ◽  
Andrew J. Schoenfeld ◽  
Vivek Sahai ◽  
Gregory A. Vrabec ◽  
Jason Tank ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Bone Screws ◽  
Osteoporotic Bone ◽  
Insertion Torque ◽  
Hole Size ◽  
Pullout Strength ◽  
Pilot Hole

Effect of Insertion Torque on Bone Screw Pullout Strength

Orthopedics ◽  
2001 ◽  
Vol 24 (5) ◽  
pp. 451-454
Author(s):  
Kevin Jon Lawson ◽  
John Brems
Keyword(s):  
Insertion Torque ◽  
Pullout Strength ◽  
Bone Screw

Effect of Cutting Flute Design on Cortical Bone Screw Insertion Torque and Pullout Strength

2001 ◽  
Vol 15 (3) ◽  
pp. 216-221 ◽  
Author(s):  
Scott Yerby ◽  
C. Corey Scott ◽  
Nathan J. Evans ◽  
Katie L. Messing ◽  
Dennis R. Carter
Keyword(s):  
Cortical Bone ◽  
Insertion Torque ◽  
Pullout Strength ◽  
Bone Screw ◽  
Screw Insertion

scholarly journals Effect of Microimplant Neck Design with and without Microthread on Pullout Strength and Destruction Volume

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5991
Author(s):  
Yu-Chuan Tseng ◽  
Han-Sheng Chen ◽  
Szu-Yu Hsiao ◽  
Kun-Jung Hsu ◽  
Chun-Ming Chen
Keyword(s):  
Correlation Coefficient ◽  
Type A ◽  
Insertion Torque ◽  
Strongly Correlated ◽  
Pullout Strength ◽  
Type C ◽  
Orthodontic Microimplant ◽  
Post Hoc ◽  
Spearman’S Correlation ◽  
Better Than

The microthread neck concept has been applied to dental implants. This study investigated the pullout strength and destruction volume of orthodontic microimplants with and without the microthread neck design. Fifteen microimplants (diameter: 1.5 × 10 mm) of three types (Types A and B: without microimplant neck; Type C: with microimplant neck) were tested. The insertion torque (IT), Periotest value (PTV), horizontal pullout strength (HPS), and horizontal destruction volume (HDV) of each type were measured. Kruskal–Wallis H test and Dunn’s post-hoc comparison test were performed to compare the measured values of the three types of microimplants. The correlations of the measured values were used to perform the Spearman’s correlation coefficient analysis. The ITs of Types B (8.8 Ncm) and C (8.9 Ncm) were significantly higher than those of Type A (5.2 Ncm). Type B yielded the lowest PTV (4.1), and no statistical differences in PTV were observed among the three types. Type A had a significantly lower HPS (158.8 Ncm) than Types B (226.9 Ncm) and C (212.8 Ncm). The three types did not exhibit any significant differences in the HDV. The results of the Spearman’s correlation coefficient test revealed that HDV (ρ = 0.710) and IT (ρ = 0.813) were strongly correlated with HPS, whereas for PTV and HPS, it was not. HPS was strongly and significantly correlated with HDV. The orthodontic microimplant with a microimplant neck design did not perform better than that without a microthread in the mechanical strength test.

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.

scholarly journals ‘N-Angle’: Clinical Indicator for Predictable Insertion of Ramal Bone Screws

2021 ◽  
pp. 030157422199194
Author(s):  
Vivek J Patni ◽  
Neeraj E Kolge ◽  
Madhura J Pednekar
Keyword(s):  
Soft Tissue ◽  
Average Distance ◽  
Primary Objective ◽  
Bone Screws ◽  
Neurovascular Bundle ◽  
Primary Concern ◽  
Bone Screw ◽  
Permanent Molars ◽  
Secondary Objective ◽  
Margin Of Safety

Introduction: The primary concern in the placement of ramal bone screws is the blind nature of the procedure, as there is a thick, mobile layer of soft tissue over the bone; also, the ramus is not a uniplanar structure but is swerving like a propeller blade. The purpose of this study was to evaluate the possibility of establishing clinical guidelines based on visible dental and soft-tissue landmarks for safe, reliable, and accurate insertion of ramal bone screws. Aims and Objectives: Our primary objective was to evaluate the angle formed between the appropriate direction of ramal-implant placement and the line tangential to the buccal surfaces of the first and second permanent molars. Our secondary objective was to evaluate the average distance of the neurovascular bundle from the tip of the bone screw. Materials and Methods: We obtained 80 cone beam computed tomography (CBCT) samples, marked reference lines and points on selected axial and coronal sections, and evaluated the following parameters using the software’s linear- and angular-measurement device: the angle between the appropriate direction of ramal bone screw placement and the line tangential to the buccal surfaces of the first and second permanent molars; and the proximity of the bone screw to the neurovascular bundle. Results: The angle between the constructed line of insertion and the occlusal line, as evaluated from our study, was 19.04 (SD ± 6.89) degrees. The proximity of the neurovascular bundle from the screw is 7.1773 (SD ± 1.73988) mm. Conclusion: We can conclude that ramal bone screws can be placed with a comfortable margin of safety.

The Study on Color Quality Attributes of IMR with PET on White Ink by UV Inkjet

2014 ◽  
Vol 1004-1005 ◽  
pp. 799-802 ◽  
Author(s):  
Chang Lang Chen ◽  
Yu Tung Chang ◽  
Sheng Hao Taso ◽  
Weichieh Hsu
Keyword(s):  
Inkjet Printing ◽  
Screen Printing ◽  
Quality Attributes ◽  
Gravure Printing ◽  
Printing Process ◽  
Color Quality ◽  
Study Results ◽  
Color Differences ◽  
Pet Film ◽  
Better Than

The In-Mold Roller is a revolutionary printing process by which objects are 3D decorated. Products decorated by In-Mold Roller are waterproof and protected from fading. What’s more, these kinds of decorations strongly increase the beauty, desirability and value of the objects. The In-Mold Roller is now using either of gravure printing and screen printing to print PET film. However, there are some problems with these two techniques. This research is to investigate potential usages of combining In-Mold Roller with digital UV inkjet printing in 3D decoration, e.g. in personalized printing services. Study results found that when the coverage and the resolution of inkjet printing become higher, the SIDs will become higher as well. When transferred to ABS, SIDs in each combination will increase. Each combination of inkjet conditions, with the isolation of white ink, color differences are less variant. TVIs of white ink decrease 30% to 40% halftone and display in “M” type. In print contrast, C and K colors of each combination are better than M and Y colors. After transferred into print contrast, each combination of PC will be higher about 2 to5. When transferred to ABS, color variances of each combination are not huge, and color differences are about 3to5.

scholarly journals Differences in the Motor Coordination Abilities Among Adolescent Gymnasts, Swimmers, and Ice Hockey Players

2017 ◽  
Vol 18 (1) ◽  
Author(s):  
Timo Jaakkola ◽  
Anthony Watt ◽  
Sami Kalaja
Keyword(s):  
Motor Coordination ◽  
Ice Hockey ◽  
Specific Training ◽  
Young Athletes ◽  
Test Protocol ◽  
Male Adolescents ◽  
Age Related ◽  
Study Results ◽  
Hockey Players ◽  
Better Than

AbstractPurpose. Motor coordination is proposed to be a relatively stable age-related construct, unlikely to be influenced by aligned experiential factors such as intensive sport-specific training. The purpose of the study is to investigate if there are differences in motor coordination abilities among young artistic gymnasts, swimmers, and ice hockey players.Methods. The participants of the study were 508 female and 258 male adolescents (age, M = 12.80, SD = 1.10) comprising artistic gymnasts (n = 463), swimmers (n = 70), and ice hockey players (n = 233). The KTK-test protocol was used to analyse their gross motor coordination abilities.Results. The results of the study demonstrated that gymnasts scored better than ice hockey players and swimmers in the test of walking backwards along a beam, and better than ice hockey players in total motor coordination, hopping over an obstacle, and the test of moving sideways on wooden boards. However, ice hockey players scored higher than swimmers and gymnasts in the test of jumping from side to side. Subsequently, swimmers obtained better results in the test of moving sideways on wooden boards as compared with ice hockey players.Conclusions. The study results indicate that intensive sport-specific training may extend young athletes′ motor coordination characteristics in the ability areas representative of the sport in which they engage.

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