scholarly journals Axial Displacements and Removal Torque Changes of Five Different Implant-Abutment Connections under Static Vertical Loading

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 699 ◽  
Author(s):  
Ki-Seong Kim ◽  
Young-Jun Lim
Keyword(s):  
Static Loading ◽  
Testing Machine ◽  
Butt Joint ◽  
Removal Torque ◽  
Vertical Loading ◽  
Implant Abutment ◽  
Before And After ◽  
Masticatory Force ◽  
Torque Values ◽  
Molar Region

The aim of this study was to examine the settling of abutments into implants and the removal torque value under static loading. Five different implant-abutment connections were selected (Ext: external butt joint + two-piece abutment; Int-H2: internal hexagon + two-piece abutment; Int-H1: internal hexagon + one-piece abutment; Int-O2: internal octagon + two-piece abutment; Int-O1: internal octagon + one-piece abutment). Ten implant-abutment assemblies were loaded vertically downward with a 700 N load cell at a displacement rate of 1 mm/min in a universal testing machine. The settling of the abutment was obtained from the change in the total length of the entire implant-abutment unit before and after loading using an electronic digital micrometer. The post-loading removal torque value was compared to the initial torque value with a digital torque gauge. The settling values and removal torque values after 700 N static loading were in the following order, respectively: Ext < Int-H1, Int-H2 < Int-O2 < Int-O1 and Int-O2 < Int-H2 < Ext < Int-H1, Int-O1 (α = 0.05). After 700 N vertical static loading, the removal torque values were statistically different from the initial values, and the post-loading values increased in the Int-O1 group and Int-H1 group (α = 0.05) and decreased in the Ext group, Int-H2 group, and Int-O2 group (α = 0.05). On the basis of the results of this study, it should be taken into consideration that a loss of the preload due to the settling effect can lead to screw loosening during a clinical procedure in the molar region where masticatory force is relatively greater.

scholarly journals An Indirect Method to Measure Abutment Screw Preload: A Pilot Study Based on Micro-CT Scanning

2015 ◽  
Vol 26 (6) ◽  
pp. 596-601 ◽  
Author(s):  
Carlos Eduardo E. Rezende ◽  
Jason Alan Griggs ◽  
Yuanyuan Duan ◽  
Amanda M. Mushashe ◽  
Gisele Maria Correr Nolasco ◽  
...  
Keyword(s):  
Ct Scanning ◽  
Measuring Method ◽  
Micro Ct ◽  
Ct Scanner ◽  
Removal Torque ◽  
Ct Technique ◽  
Original Length ◽  
Implant Abutment ◽  
Torque Values ◽  
Abutment Screw

This study aimed to measure the preload in different implant platform geometries based on micro-CT images. External hexagon (EH) implants and Morse Tapered (MT) implants (n=5) were used for the preload measurement. The abutment screws were scanned in micro-CT to obtain their virtual models, which were used to record their initial length. The abutments were screwed on the implant with a 20 Ncm torque and the set composed by implant, abutment screw and abutment were taken to the micro-CT scanner to obtain virtual slices of the specimens. These slices allowed the measurement of screw lengths after torque application and based on the screw elongation. Preload values were calculated using the Hooke's Law. The preloads of both groups were compared by independent t-test. Removal torque of each specimen was recorded. To evaluate the accuracy of the micro-CT technique, three rods with known lengths were scanned and the length of their virtual model was measured and compared with the original length. One rod was scanned four times to evaluate the measuring method variation. There was no difference between groups for preload (EH = 461.6 N and MT = 477.4 N), but the EH group showed higher removal torque values (13.8±4.7 against 8.2±3.6 Ncm for MT group). The micro-CT technique showed a variability of 0.053% and repeatability showed an error of 0.23 to 0.28%. Within the limitations of this study, there was no difference between external hexagon and Morse taper for preload. The method using micro-CT may be considered for preload calculation.

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 Effect of Implant Platform Connection and Abutment Material on Removal Torque and Implant Hexagon Plastic Deformation

2019 ◽  
Vol 13 (03) ◽  
pp. 349-353
Author(s):  
Paulo Henrique de Souza Pereira ◽  
Marina Amaral ◽  
Kusai Baroudi ◽  
Rafael Pino Vitti ◽  
Mohammad Zakaria Nassani ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Surface Area ◽  
Dental Implants ◽  
Sem Images ◽  
Removal Torque ◽  
Significance Level ◽  
Mechanical Cycling ◽  
Before And After ◽  
Cad Cam ◽  
Torque Values

Abstract Objectives The aim of this study was to evaluate the plastic deformation of the hexagonal connection, and the removal torque of the implant-abutment joint of two dental implants combined with internal or external hexagonal connection implants after mechanical cycling. Materials and Methods Twenty-four dental implants were used in the study. Half of the implants had internal hexagonal connections (IH; Titamax II Plus) and the other half had external hexagonal connections (EH; Titamax Ti Ex). Four groups of two types of dental implant abutments (titanium: Ti, UCLA II Plus and zirconia: Zr, fabricated by CAD/CAM; n = 6) were investigated. The abutments received a metallic crown and the settings were submitted to mechanical cycling (MC; 106 cycles, axial load, 120N). The connection surface area was measured by scanning electron microscope (SEM) images. The removal torque was evaluated and the plastic deformation of the hexagonal surface of the implant was measured by comparing the images before and after MC. Statistical Analysis Paired-t test was used to analyze the data statistically at a significance level of α = 0.05. Results The torque values decreased for all groups after MC, and the hexagonal surface area decreased due to plastic deformation for IH and EH associated with Zr abutments. Conclusions Zirconia abutments showed the worst plastic deformation of the implant connection surface and torque loosening when associated with IH implant.

Strength of Ductile Adhesive Butt Joint Bonded with Dissimilar Adherents: Effect of Surface Roughness

2014 ◽  
Vol 554 ◽  
pp. 366-370 ◽  
Author(s):  
Nurul Atikah ◽  
Mohd Afendi ◽  
Siti Hirmaliza ◽  
Mohd Shukry Abdul Majid ◽  
Nurul Amira ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Static Loading ◽  
Testing Machine ◽  
Butt Joint ◽  
Butt Joints ◽  
Universal Testing ◽  
Different Types ◽  
Relationship Of ◽  
The Relationship ◽  
Effect Of Surface

The purpose of this project is to study the influence of the macroscopic state of surface roughness of the dissimilar adherent on the strength of adhesive joint. In this project, several types of sandpaper were used to produce different surface roughness of stainless steel and aluminium alloy adherents. All bonding surfaces were polished with different types of sandpaper. Butt joints of dissimilar adherent specimen were produced using a ductile adhesive (i.e. Araldite®Standard) with same bond thickness. The specimens were tested under static loading condition using universal testing machine (UTM) to investigate the relationship of the surface roughness and bond strength.

scholarly journals Evaluation of removal torque values for titanium screws of prosthetic abutments after different torque application techniques: in vitro study

2016 ◽  
Vol 19 (4) ◽  
pp. 12
Author(s):  
Carolina Enith Bullen Medina ◽  
Caroline Freitas Rafael ◽  
Claudia Angela Maria Volpato ◽  
Mutlu Özcan ◽  
Diego Klee de Vasconcelos
Keyword(s):  
Testing Machine ◽  
In Vitro Study ◽  
Removal Torque ◽  
Titanium Screws ◽  
Application Techniques ◽  
Group 3 ◽  
Group 2 ◽  
Torque Values ◽  
Group 1

<p class="Corpo"><strong>Objective:</strong> To evaluate the removal torque values on abutment screws after different torque application techniques. <strong>Materials and methods:</strong> Thirty specimens of an external hexagon implant, a prefabricated abutment and a titanium screw were distributed randomly in three groups. In group 1, the screws received a torque of 30 N.cm; group 2 received a torque of 30N.cm and a second torque after 10 min, in accordance with the technique proposed by Brending et al. and Dixon et al.; in group 3, a torque of 30 N.cm was applied and maintained for 20 s, in accordance with the technique recommended by Sella et al. The specimens were attached to a universal testing machine and a digital key was coupled to the load cell in order to control the torque value at a velocity of 1 N.cm/s. Removal torque was performed 10 minutes after torque application. Values were statistically analysed using one-way ANOVA and Tukey’s HSD test (α = 0.05). <strong>Results:</strong> The mean and standard deviations (±SD) of removal torque values found were 27.95±0.99N.cm for group 1, 28.32±0.68N.cm for group 2 and 26.89±1.03N.cm for group 3. Groups 1 and 2 exhibited statistically higher values of torque than group 3 (p ˂ 0.05). <strong>Conclusion:</strong> The technique recommended by Breeding et al. and Dixon et al. seemed to be the best option when considering the removal torque values of external hexagon implants.</p><p class="Corpo"> </p><p class="Corpo"><strong>Keywords<em>:</em></strong><strong> </strong>Abutment screw; Dental implants; Removal torque.<strong></strong></p>

scholarly journals Effect of Using Nano and Micro Airborne Abrasive Particles on Bond Strength of Implant Abutment to Prosthesis

2015 ◽  
Vol 26 (1) ◽  
pp. 50-55 ◽  
Author(s):  
Mansour Rismanchian ◽  
Amin Davoudi ◽  
Elham Shadmehr
Keyword(s):  
Bond Strength ◽  
Testing Machine ◽  
Control Group ◽  
Abrasive Particles ◽  
Significant Difference ◽  
Implant Abutments ◽  
Implant Abutment ◽  
Roughened Surface ◽  
Bond Strengths ◽  
Spss Software

Connecting prostheses to the implant abutments has become a concern and achieving a satisfactory retention has been focused in cement-retention prostheses recently. Sandblasting is a method to make a roughened surface for providing more retention. The aim of this study was to compare effects of nano and micro airborne abrasive particles (ABAP) in roughening surface of implant abutments and further retention of cemented copings. Thirty Xive abutments and analogues (4.5 D GH1) were mounted vertically in self-cured acrylic blocks. Full metal Ni-Cr copings with a loop on the top were fabricated with appropriate marginal adaptation for each abutment. All samples were divided into 3 groups: first group (MPS) was sandblasted with 50 µm Al2O3 micro ABAP, second group (NSP) was sandblasted with 80 nm Al2O3 nano ABAP, and the third group (C) was assumed as control. The samples were cemented with provisional cement (Temp Bond) and tensile bond strength of cemented copings was evaluated by a universal testing machine after thermic cycling. The t test for independent samples was used for statistical analysis by SPSS software (version 15) at the significant level of 0.05. Final result showed significant difference among all groups (p<0.001) and MPS manifested the highest mean retention (207.88±45.61 N) with significant difference among other groups (p<0.001). The control group showed the lowest bond strength as predicted (48.95±10.44 N). Using nano or micro ABAP is an efficient way for increasing bond strengths significantly, but it seems that micro ABAP was more effective.

scholarly journals Flexibility of K3 and ProTaper universal instruments

2011 ◽  
Vol 22 (3) ◽  
pp. 218-222 ◽  
Author(s):  
Renata Grazziotin-Soares ◽  
Flares Barato Filho ◽  
José Roberto Vanni ◽  
Susimara Almeida ◽  
Elias Pandonor Motcy de Oliveira ◽  
...  
Keyword(s):  
Mechanical Test ◽  
Testing Machine ◽  
Universal System ◽  
Universal Testing Machine ◽  
The Third ◽  
Universal Testing ◽  
Before And After ◽  
Level Of Significance ◽  
Flexible Instruments

This study used a mechanical test to evaluate the flexibility of instruments from the K3 (conicity 0.04) and the ProTaper Universal systems when they were new and after 5 uses in simulated canals. Five sets of instruments of each system were tested: K3 (15, 20, 25, 30, 35, 40 and 45) and ProTaper Universal (S1, S2, F1, F2, F3, F4 and F5). Each set of instruments was used to prepare a simulated canal and the same set of instruments was used 5 times (50 canals). The number of each subgroup represented the number of uses: 0 (control), 1, 3 and 5 uses. Before and after each use, the instruments were submitted to a mechanical flexibility test performed in a Versat 502 universal testing machine. Interactions between the instrument and the number of uses were analyzed by ANOVA and Tukey's test at a 5% level of significance. Instruments from both systems presented lower flexibility after the third use compared to the flexibility obtained after uses 0 and 1 (p<0.05), and maintained the same flexibility after the fifth use. The flexibility of instruments from the K3 system decreased with the increase of diameter, irrespective of the number of uses. Among the instruments from the ProTaper Universal system, the shaping files presented greater flexibility than the finishing files. F2 and F3 were the least flexible instruments, and F4 and F5 presented flexibility values similar to those of F1.

Influence of the interface design on the yield force of the implant–abutment complex before and after cyclic mechanical loading

2012 ◽  
Vol 56 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Marc Philipp Dittmer ◽  
Stephanie Dittmer ◽  
Lothar Borchers ◽  
Philipp Kohorst ◽  
Meike Stiesch
Keyword(s):  
Mechanical Loading ◽  
Interface Design ◽  
Implant Abutment ◽  
Before And After ◽  
Yield Force

scholarly journals Effects of Aging Torque Controllers on Screw Tightening Force and Bacterial Micro-Leakage on the Implant-Abutment Complex

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 620
Author(s):  
Yousef Jiries ◽  
Tamar Brosh ◽  
Shlomo Matalon ◽  
Vladimir Perlis ◽  
Zeev Ormianer
Keyword(s):  
Polymerase Chain Reaction Test ◽  
Tightening Force ◽  
Reduction In Force ◽  
Implant Abutment ◽  
Before And After ◽  
Spring Type ◽  
Polymerase Chain ◽  
Bacterial Leakage ◽  
Effects Of Aging ◽  
Chain Reaction Test

Aim: We assess the accuracy of torque controllers after several aging processes and the bacterial leakage on Implant-Abutment complexes (IAC).Methods: A total of 12 spring-type and 12 friction-type torque controllers and 48 IAC (24 conical and 24 hexagonal connections) were evaluated. Chemical, mechanical, temperature, and pressure-aging methods were applied individually to replicate clinical use. Torque controller accuracy was analyzed before and after aging using a calibrated gauge. To assess bacterial leakage, the IAC were suspended in a bacterial medium for 24 h. Direct Contact Test (DCT) and Polymerase Chain Reaction Test (RT-PCR) analyzed the infiltration of F. nucleatum and P. gingivalis into the IAC micro-gap. Results: A significant decrease in torque after 10 days of aging was found. The spring-type torque controller was affected the most, regardless of the aging method (P < 0.05). PCR results indicated that all groups exhibited significantly more bacterial leakage, regardless of the method used (P < 0.05). The conical IAC demonstrated more bacterial leakage of P. gingivalis compared with the hexagonal IAC (P = 0.07). DCT found bacterial growth in the IAC only before aging and was not identified after aging. Conclusion: Aging affects torque accuracy. A reduction in force was noticed after 10 days. The conical IAC exhibits more bacterial leakage, although this was not statistically significant.

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
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