scholarly journals INFLUENCE OF DIAMETER AND GEOMETRY IN THE TAPPING OF THE PILOT HOLE IN PEDICLE SCREWS

2019 ◽  
Vol 18 (1) ◽  
pp. 51-54
Author(s):  
Helton Luiz Aparecido Defino ◽  
Raffaello de Freitas Miranda ◽  
Romulo Pedroza Pinheiro ◽  
Antonio Carlos Shimano
Keyword(s):  
Statistical Difference ◽  
Pedicle Screws ◽  
Insertion Torque ◽  
Significance Level ◽  
Pilot Hole ◽  
Pullout Resistance ◽  
Screw Diameter ◽  
Pulling Force ◽  
Different Diameters ◽  
Experimental Group

ABSTRACT Objective: To evaluate the insertion torque and the pulling force of each screw with different diameters and tap. Methods: Polyurethane blocks with a pilot hole of 2.7 mm were used in the study. An experimental group with 5 blocks was formed, the insertion torque was evaluated with a torque meter, and the pullout strength of each Globus screw of 5.5 mm and 6.5 mm was assessed. Results: The comparison of the insertion torque on the 5.5 mm screws with pilot hole without tapping and with a smaller diameter than that of the screw (4.5 mm) and a different thread, and with the tapping with the same diameter as that of the screw (5.5 mm) and equal or different thread presented a statistical difference with a higher value of the insertion torque in the group in which the tapping was not performed. As for the pulling force of the 5.5 mm screw, the non-tapping of the pilot hole resulted in statistical difference with the same diameter of the screw (5.5 mm) and with a different thread of the screw. The pullout force on the 6.5 mm screw was higher in the group where the pilot hole was not tapped according to the non-parametric Kruskal-Wallis test, with significance level of p <0.05 in the comparison of the groups. Conclusions: Pilot hole tapping reduced insertion torque and pullout resistance of the pedicle screw influencing the fixation with tapping with the same screw diameter and different thread design.

scholarly journals INFLUENCE OF THE CONGRUENCE OF PILOT HOLE TAPPING ON THE ANCHORAGE OF THE PEDICLE SCREW

2020 ◽  
Vol 19 (3) ◽  
pp. 197-200
Author(s):  
RODRIGO BARRA CAIADO FLEURY ◽  
ANTÔNIO CARLOS SHIMANO ◽  
THIAGO DANTAS MATOS ◽  
KELSEN DE OLIVEIRA TEIXEIRA ◽  
VALÉRIA ROMERO ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Smooth Surface ◽  
Pedicle Screws ◽  
Strength Test ◽  
Drill Bit ◽  
Level Of Evidence ◽  
Pilot Hole ◽  
Pullout Resistance ◽  
Tensile Strength Test ◽  
Therapeutic Study

ABSTRACT Objectives To observe the influence of the congruence of the tapping of the pilot hole on the anchorage of the pedicle screws. Methods 5.5 and 6.5 mm screws from two vertebral fixation systems (Pedicol and Safe) were inserted into polyurethane blocks. Experimental groups were formed according to the pilot hole preparation: A- drilling with a 2.7 mm drill bit, B- Tapping of the pilot hole with a tap of lesser diameter than the diameter of the screw with a congruent thread design, C- Tapping of the pilot hole with a tap of lesser diameter than the diameter of the screw and an incongruous thread design. The polyurethane blocks with the screws were subjected to a tensile strength test to evaluate the pullout resistance of the screws. Results Using congruent pilot hole tapping of a lesser diameter and congruent thread design increased the pullout resistance of the rough-surface screws (Safe). The screws with a smooth surface (Pedicol) presented greater pullout resistance with tapping of a lesser diameter and incongruous thread design. Conclusions The congruence of the tap used to prepare the pilot hole increased the pullout resistance of the rough-surfaced screws. Level of Evidence III; Therapeutic Study.

scholarly journals EFFECT OF PILOT HOLE TAPPING ON PULLOUT STRENGTH AND INSERTION TORQUE OF DUAL CORE PEDICLE SCREWS

2010 ◽  
Vol 45 (6) ◽  
pp. 565-568
Author(s):  
Rodrigo César Rosa ◽  
Patrícia Silva ◽  
Maurício José Falcai ◽  
Antônio Carlos Shimano ◽  
Helton Luiz Aparecido Defino
Keyword(s):  
Pedicle Screws ◽  
Insertion Torque ◽  
Pullout Strength ◽  
Pilot Hole ◽  
Dual Core

Effects of hole preparation on screw pullout resistance and insertional torque: a biomechanical study

2001 ◽  
Vol 94 (1) ◽  
pp. 91-96 ◽  
Author(s):  
B. Tunç Öktenoǧlu ◽  
Lisa A. Ferrara ◽  
Niteen Andalkar ◽  
A. Fahir Özer ◽  
Ali Çetin Sarioǧlu ◽  
...  
Keyword(s):  
Pedicle Screws ◽  
Test Material ◽  
Lateral Mass ◽  
Core Diameter ◽  
Content Type ◽  
Pilot Hole ◽  
Pullout Resistance ◽  
Insertional Torque ◽  
Lateral Mass Screws ◽  
Fine Print

Object. The authors conducted a study to assess the effect of a pilot hole preparation on screw pullout resistance and screw insertional torque. Methods. Three different screws were tested: cancellous lateral mass screws, cortical lateral mass screws, and pedicle screws. Synthetic bone blocks were used as the host material. Each screw group was separated into two subgroups. The first subgroup of screws was inserted into the test material following pilot hole preparation. Pilot holes were prepared; a drill bit diameter size smaller than the core diameter of the screws was used. The second group of screws was inserted into the test material without pilot hole preparation (a 3- or 4-mm hole drilled for entrance site preparation only). The insertional torque was measured as the screw was advanced into the material. The screws were axially extracted from the host material at a constant speed of 2.5 mm/minute. The pullout resistances and insertional torques for the pilot hole and the nonpilot hole groups were then statistically compared. The authors found that preparation of a pilot hole caused a significant decrease in the insertional torque. The screws inserted without a pilot hole showed greater pullout resistances compared with those inserted following a pilot hole preparation; however, there was no statistically significant difference. Conclusions. The optimum screw insertion technique may involve drilling a short pilot hole and using a drill bit with a smaller diameter than the screw core diameter to increase bone—screw purchase. This applies to cancellous and cortical lateral mass screws as well as pedicle screws.

Effects of pilot hole preparation technique on pedicle screw fixation in different regions of the osteoporotic thoracic and lumbar spine

2005 ◽  
Vol 3 (5) ◽  
pp. 364-370 ◽  
Author(s):  
Jonathan J. Carmouche ◽  
Robert W. Molinari ◽  
Tad Gerlinger ◽  
John Devine ◽  
Troy Patience
Keyword(s):  
Lumbar Spine ◽  
Thoracic Spine ◽  
Pedicle Screws ◽  
Preparation Technique ◽  
Content Type ◽  
Pilot Hole ◽  
Pullout Resistance ◽  
Insertional Torque ◽  
Upper Thoracic ◽  
Fine Print

Object. The authors evaluated the effects of pilot hole preparation technique on insertional torque and axial pullout resistance in osteoporotic thoracic and lumbar vertebrae. Methods. Using a probe technique and fluoroscopy, 102 pedicle screws were placed in 51 dual-energy x-ray absorptiometry—proven osteoporotic thoracic and lumbar levels. Screws were inserted using the same-size tapping, one-size-under tapping, or no-tapping technique. Insertional torque and axial pullout resistance were measured. Analysis of variance, Fisher exact test, and regression analysis were performed. Same-size tapping decreased pullout resistance in the lumbar spine. There was no effect on pullout resistance in the thoracic spine. Pullout resistance values were lower for all insertion techniques in the upper thoracic spine. Insertional torque and bone mineral density correlated with pullout resistance in the thoracic and lumbar spine. Conclusions. Tapping decreased pedicle screw pullout resistance in the osteoporotic human lumbar spine, although it did not affect pullout strength in the thoracic spine. Tapping decreased insertional torque in upper thoracic levels. Surgeons should optimize overall construct rigidity when placing thoracic pedicle screws in patients with spinal segment osteoporosis.

scholarly journals Effectiveness of Hypnosis in Combination with Conventional Techniques of Behavior Management in Anxiety/Pain Reduction during Dental Anesthetic Infiltration

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
A. Ramírez-Carrasco ◽  
C. Butrón-Téllez Girón ◽  
O. Sanchez-Armass ◽  
M. Pierdant-Pérez
Keyword(s):  
Heart Rate ◽  
Skin Conductance ◽  
Pain Control ◽  
Behavior Management ◽  
Statistical Difference ◽  
Dental Treatment ◽  
Management Techniques ◽  
Conventional Behavior ◽  
Behavior Management Techniques ◽  
Experimental Group

Background and Objective. Anxiety/pain are experiences that make dental treatment difficult for children, especially during the time of anesthesia. Hypnosis is used in pediatric clinical situations to modify thinking, behavior, and perception as well as, recently, in dentistry; therefore the aim of this study was to evaluate the effectiveness of hypnosis combined with conventional behavior management techniques during infiltration anesthetic.Methods. Anxiety/pain were assessed with the FLACC scale during the anesthetic moment, as well as heart rate variability and skin conductance before and during the anesthetic moment, between the control and experimental group.Results. A marginal statistical difference (p=0.05) was found in the heart rate between baseline and anesthetic moment, being lower in the hypnosis group. No statistically significant differences were found with the FLACC scale or in the skin conductance (p>0.05).Conclusion. Hypnosis combined with conventional behavior management techniques decreases heart rate during anesthetic infiltration showing that there may be an improvement in anxiety/pain control through hypnotic therapy.

scholarly journals The impact of the use of some active learning strategies in the teaching of literary knowledge on the literary taste of high school students in the UAE

2019 ◽  
Vol 1 (5) ◽  
Author(s):  
Mohammed Abdul Rahman Al - Jagoub
Keyword(s):  
Active Learning ◽  
Secondary School ◽  
Learning Strategies ◽  
Group Performance ◽  
Control Group ◽  
Significance Level ◽  
Secondary Stage ◽  
Active Learning Strategies ◽  
The Impact ◽  
Experimental Group

The objective of this study was to develop an achievement test to measure the skills of literary tasting. It consists of (30) multiple choice types, which were applied to a sample of the stability test According to the KR 20 equation, the study used semi-experimental research methodology. The sample consisted of (120) male and female students of the 10th grade at Gulf Arab Secondary School for Boys and Al-Hira Secondary School for Girls in Sharjah. The people were chosen deliberately, (60) students, experimental subjects studied the material using active learning strategies, and the control group studied the same material in the normal way. After analyzing the data, the results of the study indicated that the students in the experimental group achieved a higher level of control group students Statistical analysis showed differences in the level of literary taste at the statistical significance level (α = 0.05); due to the active learning strategies, the total mathematical mean of the experimental group performance was on the post taste test (26.60) For the control group (20.90). The value of P (58.05), the value of the significance level (0.00), that is less than (0.05), which indicates that there are significant differences between the experimental group and the control group for the benefit of the experimental group, and the value of (P) Between the sex and the group was (1.00), which is not statistically significant value, where its significance (0.32), and does not indicate the existence of an effect of interaction between the teaching method and sex. The study concluded with recommendations calling on teachers to use active learning strategies in the teaching of literary knowledge. And focus on those strategies when writing Arabic language books for the secondary stage.

scholarly journals The impact of using the strategy of self-questioning in the achievement of students in the fifth grade in mathematics: أثر استخدام استراتيجية التساؤل الذاتي في تحصيل طلاب الصف الخامس الابتدائي في مادة الرياضيات

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Abdul Latif Al-Zakri
Keyword(s):  
Achievement Test ◽  
Experimental Methodology ◽  
Fifth Grade ◽  
Control Group ◽  
Significance Level ◽  
Fifth Grade Students ◽  
Significant Difference ◽  
And Control ◽  
The Impact ◽  
Experimental Group

This study aimed to examine the impact of the use of self-questioning in the understanding of fifth grade students in mathematics material. The researcher used the experimental methodology for independent groups to investigate the impact of the independent variable, which is a self-questioning strategy on the dependent variable, which is understanding. The study sample consisted of 42 students from the fifth grade students from Khubayb bin Udai School in Riyadh; equally divided into two groups of 21 students in each group (experimental and control), and after making sure from groups' equivalence by applying the tools of the study, having been taught the experimental group by using self-questioning strategy, while the control group has been studied the unit by using the traditional method. After the completion of the study of prescribed content study, study tools (achievement test) were applied then. The results indicated to the presence of a statistically significant difference (at the significance level <0. 05) between the mean scores of the two groups' students (experimental and control) in achievement test posttest for the experimental group. Since the results of the study were positive in increasing the achievement, the researcher recommended the need to use self-questioning to raise the level of achievement of learners in mathematics material

scholarly journals Pengaruh Penerapan Model Discovery Learning Terhadap Hasil Belajar Siswa Pada Pembelajaran Pkn di Kelas V SDN 02 Aur Kuning Bukittinggi

2020 ◽  
Vol 3 (2) ◽  
pp. 13
Author(s):  
Reinita Reinita
Keyword(s):  
Sampling Technique ◽  
Discovery Learning ◽  
Control Group ◽  
Control Group Design ◽  
Sample Number ◽  
Significance Level ◽  
Civic Learning ◽  
Quasi Experimental ◽  
Experimental Type ◽  
Experimental Group

This research aims to determine the effect of the use of Discovery Learning on the results of learning Pkn in five grade students SDN 02 Aur Kuning Bukittinggi This research is a type of experimental research in the form of Quasi-Experimental Type Nonequivalent Control Group Design. The sampling technique using total sampling technique with the sample number 40students.This is evidenced by the results of the t-test with a significance level of 5% obtained count (4,28>2,03). The result of Civic learning obtained by the experimental group is higher than the control group, it is shown from mean 77,35 and the mean obtained by the control group is 74,1.

scholarly journals SCAFFOLDED READING EXPERIENCE (SRE) IN TEACHING READING COMPREHENSION

2019 ◽  
Vol 2 (1) ◽  
pp. 60-74
Author(s):  
Herawati Unmura
Keyword(s):  
Reading Comprehension ◽  
Average Score ◽  
Control Group ◽  
Teaching Reading ◽  
Significance Level ◽  
First Semester ◽  
Reading Experience ◽  
Post Test ◽  
Quasi Experimental ◽  
Experimental Group

The scaffolded reading experience framework consists of a set of prereading, during-reading, and post-reading activities to use with any genre of text, including fiction and nonfiction. The aim of this study was the effectiveness of scaffolded reading experience in teaching reading comprehension to the students of Musi Rawas University? The method used in this research was quasi-experimental method. The population of this study was all of the students of Musi Rawas University. The sample of this study was students of accounting study progrom in first semester taken through convenience non random sampling. The data were collected through a written test. It was pre-test and post test. The data analyzed through t-test formula. From this study it was found that the students’ pre-test average score in the experimental group was 55 and in the control group was 53.91. Meanwhile the students’ post-test average score in the experimental group was 80 and the students’ average score in the control group was 75. In addition of t-obtained were 2.049 where the value of t-table was 1.684 at df 74 in significance level of 0.05 and with one-tailed testing. Since the value of t-obtained was higher than the critical value of the t-table (2.049>1.684), it can be concluded that, teaching reading comprehension by using scaffolded reading experience (SRE) to the students of Musi Rawas University was effective.

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