scholarly journals Reverse torque values in indexed abutments

2013 ◽  
Vol 1 (3) ◽  
pp. 192
Author(s):  
Daiane Cerutti-Kopplin ◽  
Dimas João Rodrigues Neto ◽  
Accácio Lins Do Valle ◽  
Jefferson Ricardo Pereira ◽  
Luis Gustavo Nunes Dias Pinho
Keyword(s):  
Mechanical Stability ◽  
Insertion Torque ◽  
Average Percentage ◽  
Reverse Torque ◽  
Torque Wrench ◽  
Significant Difference ◽  
Implant Abutment ◽  
Analysis Of Results ◽  
Torque Values ◽  
Biomechanical Instability

Mechanical stability of implant-abutment set is fundamentally important for the success in implant supported rehabilitation. For this, the knowledge about torque removal values is essential. In this way, the objective of this work was to evaluate the torque reverse values in indexed abutments of Morse Taper system. Five Morse taper implants with their respective abutments were tested (n=5). Each abutment received a sequence of two consecutive torques in insertion (15Ncm) with an interval of ten minutes, and one reverse torque, all measured by digital torque wrench. The t-student test with 5% significance was used to evaluate the data. The analysis of results showed there is statistical significant difference in reverse torque values between the insertion torque value and reverse torque value intra-group, the indexed abutments presented an average percentage of torque loosing of 15% (P=0.002). It is possible to conclude that the use of indexed abutments of Morse taper system presented statistical significant reduction of reverse torque values, which in turns increase the risk of no biomechanical instability.

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

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

scholarly journals Influence of Orthodontic Anchor Screw Anchorage Method on the Stability of Artificial Bone: An In Vitro Study

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3205 ◽  
Author(s):  
Seen-Young Kang ◽  
Ji-Min Yu ◽  
Hyoung-Sik Kim ◽  
Jun-Seok Lee ◽  
Chan-Mi Yeon ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Automatic Device ◽  
Insertion Torque ◽  
Artificial Bone ◽  
Artificial Bones ◽  
Significant Difference ◽  
The Mean ◽  
The Stability ◽  
Torque Values

This study aims to compare the torque values for various lengths of the titanium-based orthodontic anchor screw (OAS), different anchorage methods and varying artificial bone densities after predrilling. Furthermore, the effects of these parameters on bone stability are evaluated. A total of 144 OASs were prepared with a diameter of 1.6 mm and heights of 6, 8 and 10 mm. Artificial bones were selected according to their density, corresponding to Grades 50, 40 and 30. Torque values for the automatic device and manual anchorage methods exhibited a statistically significant difference for the same-sized OAS, according to the bone density of the artificial bones (p < 0.05). However, when insertion torque was at the maximum rotations, there was no significant difference in the torque values for the Grade 30 artificial bone (p > 0.05). When the torque values of both anchorage methods were statistically compared with the mean difference for each group, the results of the manual anchorage method were significantly higher than those of the automatic device anchorage method (p < 0.05). A statistically significant difference was observed in the bone stability resulting from different OAS anchorage methods and artificial bone lengths. These findings suggest that the automatic anchorage method should be used when fixing the OAS.

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

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
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.

scholarly journals Influence of Implant Thread Morphology on Primary Stability: A Prospective Clinical Study

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Maria Menini ◽  
Francesco Bagnasco ◽  
Ivan Calimodio ◽  
Nicolò Di Tullio ◽  
Francesca Delucchi ◽  
...  
Keyword(s):  
Clinical Outcomes ◽  
Outcome Measures ◽  
Primary Stability ◽  
Secondary Outcome ◽  
Prospective Clinical Study ◽  
Insertion Torque ◽  
Significant Difference ◽  
Group 5 ◽  
One Year ◽  
Torque Values

Objectives. The purpose of this study was to evaluate the primary stability of two implants with the same macro- and micromorphology but different thread design and analyze their clinical outcomes over a one-year period. Materials and Methods. 14 patients needing a partial rehabilitation with a delayed loading approach (DEL group: 9 patients) or a full-arch rehabilitation treated with immediately loaded fixed prostheses supported by 4 implants following the Columbus Bridge Protocol (CBP) (IL group: 5 patients) were included. In each patient, at least one SY (implant with standard threads) and one SL implant (implant with an augmented depth of the threads) were randomly inserted. Primary outcome measures were the number of threads exposed at a torque of 30 Ncm and 50 Ncm and final insertion torque. Secondary outcome measures were implant and prosthetic failure, peri-implant bone resorption, and periodontal parameters: bleeding on probing (BoP), plaque index (PI), and probing depth (PD) evaluated at 3, 6, and 12 months of healing. Results. Nineteen SY and 19 SL implants were inserted in 14 patients. Twenty implants (10 SL and 10 SY) were inserted in the IL group, while 18 (9 SL and 9 SY) were inserted in the DEL group and followed-up for 12 months. No patients dropped out. No implants and prostheses failed. No biological complications were identified. No significant differences were found between SY and SL implants comparing the number of exposed threads when inserting the implant with a torque insertion of 30 N (T student test p=.142 and U test p=.164). At 50 N, no threads were visible in either groups. Final torque insertion values were higher for SL (mean: 48.42 Ncm) compared to SY implants (mean: 43.42 Ncm) without a statistically significant difference. All the implants showed good clinical outcomes at the 1-year-in-function visit. Conclusions. After 12 months of function, both implant types provided good clinical outcomes without statistically significant differences between the two groups. A difference in insertion torque (even if not statistically significant) was found with higher insertion torque values for SL implants with a larger thread depth.

scholarly journals In Vitro Microbiological Analysis of Bacterial Seal at the Implant-Abutment Interface Using Two Morse Taper Implant Models

2014 ◽  
Vol 25 (1) ◽  
pp. 48-53 ◽  
Author(s):  
Deceles Cristina Costa Alves ◽  
Paulo Sérgio Perri de Carvalho ◽  
Elizabeth Ferreira Martinez
Keyword(s):  
Brain Heart Infusion ◽  
The Other ◽  
Microbiological Analysis ◽  
Torque Wrench ◽  
Significant Difference ◽  
Implant Abutment ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

The objective of this study was to evaluate the bacterial seal at the implant-abutment interface using two morse taper implant models, by means of an in vitro microbiological analysis. For that were used 15 implants with mini-abutments tightened by friction, no screws (Group 1); and 30 implants with screw-tightened abutments, of which 15 received 20 N.cm of closing torque (Group 2) and the other 15 received 30 N.cm (Group 3). Microbiological analysis was carried out using colonies of Escherichia coli transported directly from a culture dish to the prosthetic component. Friction implants (Group 1) were activated by tapping and a torque wrench was used for screw-tightened implants (Groups 2 and 3). Each abutment/implant set was immersed in test tubes containing 5 mL of brain-heart infusion broth and incubated at 37 °C for 14 days, observed daily for the presence of contamination. A statistically significant difference was observed regarding the number of contaminated implants. There was greater contamination in Group 2 implants (p<0.05), with no statistically significant difference between the other groups (Group 1 = 20% and Group 3 = 0%). It was concluded that there was no significant difference in in vitro bacterial sealing between implants with mini-abutments tightened by friction without screws and implants with screw-tightened abutments with 30 N.cm of closing torque. The difference in closing torque altered the in vitro sealing ability of the tested abutments, with a greater contamination for components that received a closing torque of 20 N.cm.

Implant Abutment Screw Reverse Torque Values Before and After Plasma Cleaning

2013 ◽  
Vol 26 (4) ◽  
pp. 331-333 ◽  
Author(s):  
Costanza Micarelli ◽  
Luigi Canullo ◽  
Paolo Baldissara ◽  
Marco Clementini
Keyword(s):  
Plasma Cleaning ◽  
Reverse Torque ◽  
Implant Abutment ◽  
Before And After ◽  
Torque Values ◽  
Abutment Screw

scholarly journals Effects of insertion torque on the structure of dental implants with different connections: Experimental pilot study in vitro

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0251904
Author(s):  
Sergio Alexandre Gehrke ◽  
Gismari Miranda Amaral Pereira ◽  
Arthur Felipe Gehrke ◽  
Nilton De Bortoli Junior ◽  
Berenice Anina Dedavid
Keyword(s):  
Dental Implants ◽  
Mechanical Damage ◽  
Insertion Torque ◽  
Maximum Torque ◽  
Turning Angle ◽  
Applied Torque ◽  
Significant Difference ◽  
Torque Values ◽  
Different Diameters

Objective During the insertion of dental implants in the bone tissue, different torque values can be applied. However, the high applied torque can cause damage to the implant connection. Our study sought to evaluate, by measuring the angle of rotation of the insertion drive and, later microscopic observation, possible changes in the structure of implants of different diameters with 3 different types of connections after the application of 4 different torque intensities. Materials and methods Three hundred tapered dental implants and three hundred insertion drivers were used in the present study. Implants of 3.5 and 4 mm in diameter with 3 connection models were tested: external hexagon (EH), internal hexagon (IH) and Morse taper (MT). Then, sis groups were performed: EH3 group, EH4 group, IH3 group, IH4 group, MT3 group and MT4 group. The samples were submitted to the torque/torsion force at 4 intensities (n = 10 samples per group and intensity): 60, 80, 100 and 120 Ncm. The turning angle of the insertion driver was measured in each test. In addition, in 10 samples from each group, the maximum torque value supported by each implant model was measured. After the tests, all samples were inspected microscopically to describe the observed changes. Results The maximum torque supported by the different implant models showed statistically significant difference (p < 0.0001). The values of the measured angles showed statistically significant differences between the torque values applied within each group (p < 0.001) and between groups with the same torque value (p < 0.001). Conclusions Within the limitations of the present study in vitro, the results showed that high torque values cause mechanical damage to the implants.

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

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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