Effect of activation rate on output torque values from a dental implant toggle-style torque wrench

The aim of this study is to evaluate hexagon deformation of dental implant regarding to the insertion force, verifying the external hexagon platforms before and after each torque performed. Thereunto, 25 implants were selected and divided into 5 groups with 5 implants each one; every group received different torque 10N, 20N, 30N, 40N and 100N. A Surgical torque wrench was used, with the implant installation key, what established the insertion force for each group. The platform measurements were carried out before and after apply the torque by analyses of images acquired through implant platforms. We conclude, by this study methodology, 100N forces were able to cause changes on hexagon dimensions; however, it did not damage the prosthesis platform adaptation.

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Effect of Screw Channel Angulation on Reverse Torque Values of Dental Implant Abutment Screws

Journal of Prosthodontics ◽

10.1111/jopr.13111 ◽

2019 ◽

Vol 28 (9) ◽

pp. 969-972

Author(s):

Eric Hu ◽

Anton Petrich ◽

Glen Imamura ◽

Christopher Hamlin

Keyword(s):

Dental Implant ◽

Screw Channel ◽

Reverse Torque ◽

Implant Abutment ◽

Torque Values ◽

Dental Implant Abutment

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An in vitro evaluation on polyurethane foam sheets of the insertion torque, removal torque values, and resonance frequency analysis (RFA) of a self-tapping threads and round apex implant

Cellular Polymers ◽

10.1177/0262489320971796 ◽

2020 ◽

pp. 026248932097179

Author(s):

Margherita Tumedei ◽

Adriano Piattelli ◽

Antonello Falco ◽

Francesco De Angelis ◽

Felice Lorusso ◽

...

Keyword(s):

Resonance Frequency ◽

Dental Implant ◽

Frequency Analysis ◽

Insertion Torque ◽

Resonance Frequency Analysis ◽

Removal Torque ◽

In Vitro Investigation ◽

Posterior Maxilla ◽

Torque Values

The dental implant primary stability and micromovement absence represent critical factor for dental implant osseointegration. The aim of the present in vitro investigation was to simulate the bone response on different polyurethane densities the effect of self-tapping threads and round apex implant geometry. A total of 40 implants were positioned in D1, D2, D3 and D4 polyurethane block densities following a calibrated drilling protocol. The Insertion, removal Torque and resonance frequency analysis (RFA) means were calculated. All experimental conditions showed insertion torque values >30 Ncm. A significant higher insertion torque, removal and RFA was present in D1 polyurethane. Similar evidences were evidenced for D3 and D4. The effectiveness of the present study suggested a valuable clinical advantage for self-tapping threads and round apex implant using, such as in case of reduced bone density in the posterior maxilla

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In Vitro Evaluation of Manual Torque Values Applied to Implant-Abutment Complex by Different Clinicians and Abutment Screw Loosening

BioMed Research International ◽

10.1155/2017/7376261 ◽

2017 ◽

Vol 2017 ◽

pp. 1-9 ◽

Cited By ~ 5

Author(s):

Onur Dincer Kose ◽

Burcin Karataslı ◽

Sabit Demircan ◽

Taha Emre Kose ◽

Erhan Cene ◽

...

Keyword(s):

Dynamic Loading ◽

Optical Microscope ◽

Control Group ◽

Screw Loosening ◽

Loading Test ◽

Torque Wrench ◽

Implant Abutment ◽

Torque Values ◽

Abutment Screw

Preload is applied to screws manually or using a torque wrench in dental implant systems, and the preload applied must be appropriate for the purpose. The aim of this study was to assess screw loosening and bending/torsional moments applied by clinicians of various specialties following application of manual tightening torque to combinations of implants and abutments. Ten-millimeter implants of 3.7 and 4.1 mm diameters and standard or solid abutments were used. Each group contained five implant-abutment combinations. The control and experimental groups comprised 20 and 160 specimens, respectively. Implants in the experimental group were tightened by dentists of different specialties. Torsional and bending moments during tightening were measured using a strain gauge. Control group and implants with preload values close to the ideal preload were subjected to a dynamic loading test at 150 N, 15 Hz, and 85,000 cycles. The implants that deformed in this test were examined using an optical microscope to assess deformities. Manual tightening did not yield the manufacturer-recommended preload values. Dynamic loading testing suggested early screw loosening/fracture in samples with insufficient preload.

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Removal Torque Analysis of Implants in Rabbit Tibia After Topical Application of Simvastatin Gel

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-11-00128 ◽

2014 ◽

Vol 40 (1) ◽

pp. 53-59 ◽

Cited By ~ 4

Author(s):

Fatima Neves Faraco-Schwed ◽

Luiz Macedo Mangueira ◽

Joao Vitor Albuquerque Ribeiro ◽

Alexsandro Da Silva Antao ◽

Jamil Awad Shibli

Keyword(s):

Topical Application ◽

Topical Administration ◽

Titanium Implants ◽

Removal Torque ◽

Implant Placement ◽

Group I ◽

Torque Wrench ◽

Rabbit Tibia ◽

Torque Analysis ◽

Torque Values

The aim of this study was to evaluate the effects of topical application of simvastatin gel (7.5 mg) on the removal torque of titanium implants in the rabbit tibia. A total of 32 surgeries were performed on 16 New Zealand rabbits for the placement of 2 implants in 1 tibia of each rabbit. Only 1 of the surgical defects was injected with 30 mg/mL of simvastatin gel before implant placement. The initial torque was set at 20 N.cm, and removal torque testing was performed 28 and 56 days postoperatively with a Tonishi torque wrench. Surgical defects were divided into 4 groups: group IG-28 (test, 28 days), group IG-56 (test, 56 days), group I-28 (control, 28 days), and group I-56 (control, 56 days). Removal torque values were higher in group IG-56 than in groups IG-28, I-28, and I-56 (P < .05). Groups IG-28, I-28, and I-56 showed similar values (P > .05). Removal torque force increased under the influence of simvastatin, indicating that topical administration of a 7.5-mg dose of simvastatin gel is effective in improving the torque force required to remove implants inserted in the rabbit tibia.

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Opening Jars: An Anthropometric Study of the Wrist-Twisting Strength of the Elderly

Proceedings of the Human Factors Society Annual Meeting ◽

10.1177/154193128302700132 ◽

1983 ◽

Vol 27 (1) ◽

pp. 112-116 ◽

Cited By ~ 13

Author(s):

Frederick H. Rohles ◽

Kelli L. Moldrup ◽

Joseph E. Laviana

Keyword(s):

Body Weight ◽

Large Diameter ◽

The Elderly ◽

Commercial Products ◽

Men And Women ◽

Torque Wrench ◽

Main Determinants ◽

Torque Values ◽

Hand Length ◽

Anthropometric Study

The purpose of this study was to measure the wrist-twisting strength among the elderly. The subjects were 100 men and 100 women whose ages ranged from 62 to 92 years. To measure their wrist-twisting strength a device was developed that consisted of a modified torque-wrench which would accept 8 different container lids whose diameters ranged from 27 mm to 123 mm. Each subject performed the wrist-twisting task on each lid 4 times – twice clockwise and twice counter-clockwise. The results showed that men were stronger than the women, that there was no difference in the torque from a clockwise or a counter-clockwise twist, and that a greater amount of torque could be applied to large diameter lids than to smaller diameter lids. When age, body weight, height, grasp, lateral prehension, and hand length, breadth, and spread were correlated with the wrist-twisting strength it was found that for the men, age, grasp and hand length contributed to torque and for the women, body weight, grasp, and lateral prehension were the main determinants of torque. In addition the torque required to open various commercial products was measured so that by comparing these torque values with those of the wrist-twisting strength it was able to estimate the percentage of men and women who could open a jar of a given diameter and torque.

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Measurement of Clinicians' Ability to Hand Torque Dental Implant Components

Journal of Oral Implantology ◽

10.1563/1548-1336-35.4.185 ◽

2009 ◽

Vol 35 (4) ◽

pp. 185-188 ◽

Cited By ~ 14

Author(s):

Ali Kanawati ◽

Mark W. Richards ◽

Jeffery J. Becker ◽

Natalie E. Monaco

Keyword(s):

Dental Implant ◽

Dental Students ◽

Male Students ◽

Torque Measurement ◽

Maximum Torque ◽

Average Maximum ◽

Dental Practitioners ◽

Significant Difference ◽

Implant Dentistry ◽

Torque Values

Abstract There is a varying degree of hand torque abilities using finger drivers among clinicians. Calibrating one's own abilities requires complicated instruments not readily available. This study evaluated a simple-to-use method that allows dental practitioners to have a quantifiable clinical assessment of relative torque ability using finger drivers to torque down dental implant components. A typodont that includes dental implants was mounted in a mannequin placed in a patient-reclined position. The subjects were asked to torque as tightly as they could a new healing abutment to an implant secured firmly in resin within the typodont. All participants wore moistened gloves when using a finger driver. The healing abutment was countertorqued using a certified precalibrated precision torque measurement device. The reading on the torque driver was recorded when the healing abutment disengaged. An average of torque values of dentists and dental students was calculated. Fifty subjects had an average maximum torque ability of 24 Ncm (male dentists: 28 Ncm; students: 22 Ncm; male students: 24 Ncm; female students: 19 Ncm). Maximum torque values for all participants ranged from 11 Ncm to 38 Ncm. There was no significant difference between groups. This study showed a varying degree of hand torquing abilities using a finger driver. Clinicians should regularly calibrate their ability to torque implant components to more predictably perform implant dentistry. Dental implant manufacturers should more precisely instruct clinicians as to maximum torque, as opposed to “finger tighten only.”

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Influence of the Geometric Characteristics of the Mini-Implants on Mechanicals Properties Using Artificial Bone Similar to Anterior, Middle and Posterior Regions of the Jaws

Materials Science Forum ◽

10.4028/www.scientific.net/msf.930.276 ◽

2018 ◽

Vol 930 ◽

pp. 276-282

Author(s):

E.I.O. Pesqueira ◽

Cristiano Stefano Mucsi ◽

Jesualdo Luiz Rossi

Keyword(s):

Bone Density ◽

Cortical Thickness ◽

Insertion Torque ◽

Trabecular Thickness ◽

Mini Implants ◽

Torque Wrench ◽

Artificial Bones ◽

Before And After ◽

Twin Screw ◽

Torque Values

The objective of this study was to identify the best torque of insertion and removal of mini-implants with a twin screw design (compact and self-drilling) into artificial bones with density and trabecular thickness, similar to anterior, middle and posterior regions of the jaws. Observation of the mini-implants surface using electron microscopy was performed before and after the tests. The torque values obtained during the insertion and removal was measured by digital torque wrench. The analyzed results led to the conclusion that the insertion and removal torques were larger with increase in bone density and cortical thickness. The design of the threads of the mini-implants influenced the insertion torque. Threads with smaller pitch increased the value of insertion torque. The anterior bone drilling installation reduces the insertion torque independent of bone density. Torque increased mainly by increasing the bone density and not necessarily with increased cortical thickness suggesting that the bone density of the trabecular bone must be considered in designing the installation of mini-implants.

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Dynamic Simulation Analysis and Experiment of Large-caliber Self-propelled Pipeline Crawler Based on ADAMS

Journal of Physics Conference Series ◽

10.1088/1742-6596/2095/1/012049 ◽

2021 ◽

Vol 2095 (1) ◽

pp. 012049

Author(s):

Yinlong Tang ◽

Huadong Song ◽

Yating Yu ◽

Jun Zhang ◽

Wenguang Hu ◽

...

Keyword(s):

Simulation Analysis ◽

Solution Process ◽

Analysis Method ◽

Long Period ◽

The Past ◽

Output Torque ◽

Driving Wheel ◽

Motion Performance ◽

Solid Works ◽

Torque Values

Abstract The force states of driving wheels are different when the self-propelled pipeline crawler moves in the pipeline, so it is difficult to carry out accurate theoretical analysis and calculation on the force and output torque values of each driving wheel in horizontal, climbing and turning conditions of the crawler. Due to the complex mechanical properties of pipeline sealing and the limitation of visualization, it takes a long period and high cost to develop the robot in pipeline by experimental means. With the gradual application of virtual simulation means, the complicated dynamic analysis and solution process in the past has become relatively easy. In this paper, Solid works is used to establish a simplified model of the crawler, and ADAMS is used to analyze and simulate the dynamics of the crawler. The force of the multi-wheel driven pipeline crawler is given under the condition of horizontal, climbing 35° and turning, which provides the necessary analysis method and theoretical basis for the design optimization and improvement. Finally, the horizontal, climbing and bending motion performance of the crawler is verified by comprehensive pipeline experiment.

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Factors Affecting Torque of Beam Type Implant Torque Wrench

10.21203/rs.3.rs-146520/v1 ◽

2021 ◽

Author(s):

Yuji Sato ◽

Junichi Furuya ◽

Tokiko Osawa ◽

Akio Isobe ◽

Myu Hayashi ◽

...

Keyword(s):

Coefficient Of Variation ◽

Beam Width ◽

Factors Affecting ◽

Tightening Torque ◽

Torque Wrench ◽

Screw Breakage ◽

Beam Type ◽

The Difference ◽

Torque Values ◽

Accuracy And Repeatability

Abstract Background: Screw breakage and loosening are the most common mechanical complications in implant treatment. One of the causes is the excess or deficiency of the screw tightening torque; thus, the use of a torque wrench is a prerequisite for achieving an accurate tightening torque. Therefore, we focused on the beam-type torque wrenches, which are the main type, to clarify the factors affecting this torque.Results: The torque values of the beam-type torque wrenches for the eight manufacturers were measured using a torque gauge. For investigating the influence of the location of the beam placed on the scale, the measurement was performed with the scale aligned with the upper edge, center, and lower edge of the beam. Additionally, measurements were taken at 90°, 60°, and 30° to examine the effect of the angle at which the examiner read the torque value. Under each condition, a single examiner applied the recommended torque value of each manufacturer's screws five times clockwise. The average measured torque, standard deviation, bias, and coefficient of variation were calculated and compared. Equipment from six manufacturers demonstrated the best accuracy for measurements at the center of the beam (bias within ± 4%). For measurements at 90°, equipment from five manufacturers displayed the highest accuracy (bias within ± 7%), and seven showed the highest repeatability (coefficient of variation 2% or less).Conclusion: It was recommended that the center of the beam should be aligned with the scale and read from 90°, while tightening the torque wrench. The accuracy and repeatability differed according to the manufacturer, scale width, scale line width, and beam width, while the distance between scale and beam center was related to accuracy and repeatability. Based on these results, it was suggested that a torque wrench must be selected after grasping the difference depending on the structure of the model to be used.

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