scholarly journals Design characteristics, primary stability and risk of fracture of orthodontic mini-Implants: Pilot scan electron microscope and mechanical studies

2013 ◽  
pp. e804-e810 ◽  
Author(s):  
A. Walter ◽  
H. Winsauer ◽  
J. Marce-Nogue ◽  
S. Mojal ◽  
A. Puigdollers
Keyword(s):  
Electron Microscope ◽  
Primary Stability ◽  
Scan Electron Microscope ◽  
Risk Of Fracture ◽  
Mini Implants ◽  
Design Characteristics ◽  
Mechanical Studies

scholarly journals Experimental & FEM Analysis of Orthodontic Mini-Implant Design on Primary Stability

2021 ◽  
Vol 11 (12) ◽  
pp. 5461
Author(s):  
Elmedin Mešić ◽  
Enis Muratović ◽  
Lejla Redžepagić-Vražalica ◽  
Nedim Pervan ◽  
Adis J. Muminović ◽  
...  
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Primary Stability ◽  
Fem Analysis ◽  
Implant Design ◽  
Special Focus ◽  
Engineering System ◽  
Mini Implants ◽  
Pull Out ◽  
Computer Aided

The main objective of this research is to establish a connection between orthodontic mini-implant design, pull-out force and primary stability by comparing two commercial mini-implants or temporary anchorage devices, Tomas®-pin and Perfect Anchor. Mini-implant geometric analysis and quantification of bone characteristics are performed, whereupon experimental in vitro pull-out test is conducted. With the use of the CATIA (Computer Aided Three-dimensional Interactive Application) CAD (Computer Aided Design)/CAM (Computer Aided Manufacturing)/CAE (Computer Aided Engineering) system, 3D (Three-dimensional) geometric models of mini-implants and bone segments are created. Afterwards, those same models are imported into Abaqus software, where finite element models are generated with a special focus on material properties, boundary conditions and interactions. FEM (Finite Element Method) analysis is used to simulate the pull-out test. Then, the results of the structural analysis are compared with the experimental results. The FEM analysis results contain information about maximum stresses on implant–bone system caused due to the pull-out force. It is determined that the core diameter of a screw thread and conicity are the main factors of the mini-implant design that have a direct impact on primary stability. Additionally, stresses generated on the Tomas®-pin model are lower than stresses on Perfect Anchor, even though Tomas®-pin endures greater pull-out forces, the implant system with implemented Tomas®-pin still represents a more stressed system due to the uniform distribution of stresses with bigger values.

An Experiment for Effects of Different Additives on Strength of Sediment Solidification

2013 ◽  
Vol 357-360 ◽  
pp. 1235-1240 ◽  
Author(s):  
Guan Huan Chen ◽  
Jian Zhong Zhu
Keyword(s):  
Compressive Strength ◽  
Electron Microscope ◽  
Unconfined Compressive Strength ◽  
Scan Electron Microscope ◽  
Dredged Sediment ◽  
Comparative Tests ◽  
Cement Based Materials

The solidification method is a significant and resultful method for the disposal of dredged sediment. Solidified agents can be employed to improve the unconfined compressive strength (UCS) of sediment solidification. In this work, considering of economy and practicability, three kinds of optimized compound additives are selected and investigated on the effects of UCS of sediment solidification. 7d., 14d.and 28d. solidification stadium were taken to test the UCS of samples. Results showed that the activator had the best effect on increasing the UCS. The comparative tests also indicated that adding any kind of additive into the cement-based materials could improve the UCS of sediment solidification, the highest value of UCS was 11.02MPa (SCAHR). By means of scan electron microscope (SEM) technology, the microstructure images of the raw sample and solidified sample were obtained, which help to understand the development of UCS of the solidified sediments.

scholarly journals Geometrical design characteristics of orthodontic mini-implants predicting maximum insertion torque

2014 ◽  
Vol 44 (4) ◽  
pp. 177 ◽  
Author(s):  
Višnja Katić ◽  
Ervin Kamenar ◽  
David Blažević ◽  
Stjepan Špalj
Keyword(s):  
Insertion Torque ◽  
Geometrical Design ◽  
Mini Implants ◽  
Design Characteristics

scholarly journals Evaluation of the effect of force direction on stationary anchorage success of mini-implant with a lever-arm–shaped upper structure

2011 ◽  
Vol 81 (5) ◽  
pp. 776-782 ◽  
Author(s):  
Ki-Ho Park ◽  
Eun-Man Lee ◽  
Seung-il Shin ◽  
Seong-Hun Kim ◽  
Young-Guk Park ◽  
...  
Keyword(s):  
Primary Stability ◽  
The Other ◽  
Control Group ◽  
Removal Torque ◽  
Lever Arm ◽  
Mini Implants ◽  
Force Direction ◽  
The Mean ◽  
The Stability ◽  
Experimental Group

Abstract Objective: To compare the effect of clockwise and counterclockwise torque on the primary stability of a mini-implant with a lever-arm–shaped upper structure. Materials and Methods: Twenty-four white rabbits were used for this study. Two screw-type mini-implants were placed in each tibia. In all, 96 screws were inserted. Two weeks later, a 2-N force was applied to the mini-implants without an upper structure in eight rabbits (control group). The mini-implants of the other 16 rabbits were loaded with an upper structure (experimental group). In the experimental group, the two left mini-implants were loaded in a clockwise direction (CW group) and the two right implants were loaded in a counterclockwise direction (CCW group). The rabbits were sacrificed at 1 week or 8 weeks after loading in both control and experimental groups. The removal torque value (RTV) was measured in 15 of 16 mini-implants in each group and the remaining implant was processed for histologic examination. Results: At 1 week there were no significant differences in the mean RTV between the control, CW, and CCW groups. At 8 weeks, the RTV was higher in the control and experimental groups than in the respective 1-week groups. At 8 weeks, there were no significant differences in the RTV between the control and CW groups, but the CCW group showed a lower RTV. Conclusions: CCW torque can decrease the stability of a mini-implant, whereas a CW torque has no effect.

Experimental investigation of commercial small diameter dental implants in porcine mandibular segments

2017 ◽  
Vol 62 (1) ◽  
Author(s):  
Istabrak Hasan ◽  
Friedhelm Heinemann ◽  
Monika Schwegmann ◽  
Ludger Keilig ◽  
Helmut Stark ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Dental Implants ◽  
Small Diameter ◽  
Primary Stability ◽  
The Self ◽  
Immediate Loading ◽  
Mini Implants ◽  
Scientific Analysis ◽  
Loading System ◽  
Implant Treatment

AbstractSmall diameter (mini) dental implants have become more popular in recent years as alternatives to classical implant treatment in clinical cases with critical bony situations. However, an in-depth scientific analysis of the mechanical and biomechanical effects of small diameter implants has not yet been published. The aim of the present study was to investigate experimentally different commercial mini implants by measuring their displacements under immediate loading. Twelve commercially available mini implants were measured. Implants were inserted into porcine mandibular segments and loaded by means of a predefined displacement of 0.5 mm of the loading system. The implants were loaded at an angle of 30° to the implant long axis using the self-developed biomechanical hexapod measurement system. Implant displacements were registered. The experimental results were compared to the numerical ones from a previous study. Measured implant displacements were within the range of 39–194 μm. A large variation in the displacements was obtained among the different implant systems due to the different designs and thread profiles. Comparing experimental and numerical results, the displacements that were obtained numerically were within the range of 79–347 μm. The different commercial mini implants showed acceptable primary stability and could be loaded immediately after their insertion.

scholarly journals Comparative evaluation of primary stability of two different types of orthodontic mini-implants

2021 ◽  
Vol 13 (5) ◽  
pp. 128
Author(s):  
Ritesh Vatsa ◽  
Singh Jyotirmay ◽  
SanjayKumar Singh ◽  
AbhinavRaj Gupta ◽  
SubhashChandra Nayak ◽  
...  
Keyword(s):  
Comparative Evaluation ◽  
Primary Stability ◽  
Mini Implants ◽  
Different Types

Predicting primary stability of orthodontic mini‐implants, according to position, screw‐size, and bone quality, in the maxilla of aged patients: a cadaveric study

2019 ◽  
Vol 127 (5) ◽  
pp. 462-471 ◽  
Author(s):  
Stephan C. Möhlhenrich ◽  
Nicole Heussen ◽  
Philipp Winterhalder ◽  
Andreas Prescher ◽  
Frank Hölzle ◽  
...  
Keyword(s):  
Bone Quality ◽  
Primary Stability ◽  
Cadaveric Study ◽  
Aged Patients ◽  
Mini Implants

Preparation and Mechanism of Natural Brucite Nanofibers

2007 ◽  
Author(s):  
Li Xu ◽  
Wen Ni ◽  
Xiaoguang Yang ◽  
Hailong Yang ◽  
Wei Liu ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Fiber Quality ◽  
Fire Retardant ◽  
Scan Electron Microscope ◽  
Test Results ◽  
Insulating Materials ◽  
Solid Ratio ◽  
Transmission Electron ◽  
Sio2 Aerogel

Test results indicate that brucite fibers could be well dispersed by using OT as the dispersant at the water/solid ratio of 20:1, at the dosage of 15% of fiber quality and in the dispersing duration of 30 minutes. The prepared nanofibers were characterized with a scan electron microscope (SEM) and a transmission electron microscope (TEM). Test results indicate that the prepared single brucite nanofiber was around 30nm long in diameter and the talus of non-single brucite nanofibers was about 50nm∼150nm long in diameter. Brucite nanofibers may be used as a fortifier for compound such as the SiO2 aerogel super insulating materials. Since brucite is also an excellent fire retardant, brucite nanofibers are expected to be used widely in the high-molecular materials sector.

scholarly journals Effect of vertical placement angle on the insertion torque of mini-implants in human alveolar bone

2016 ◽  
Vol 21 (5) ◽  
pp. 47-52 ◽  
Author(s):  
Rafael Ribeiro Maya ◽  
◽  
Célia Regina Maio Pinzan-Vercelino ◽  
Julio de Araujo Gurgel ◽  
Keyword(s):  
Alveolar Bone ◽  
Ex Vivo ◽  
Primary Stability ◽  
Insertion Torque ◽  
Significance Level ◽  
Mini Implants ◽  
Implant Placement ◽  
Human Cadavers ◽  
Ex Vivo Study ◽  
Posterior Area

ABSTRACT Objective: The aim of the present ex-vivo study was to evaluate the effect of the vertical placement angle of mini-implants on primary stability by analyzing maximum insertion torque (MIT). Methods: Mini-implants were placed in 30 human cadavers, inserted at either a 90° or 60° angle to the buccal surface of the maxillary first molar. Out of 60 self-drilling mini-implants used, half were of the cylindrical type and half were of the conical type. Primary stability was assessed by means of measuring the MIT. Data were subjected to analysis of variance (ANOVA) and Newman-Keuls tests. A significance level of 5% was adopted. Results: The MIT was higher for both mini-implant types when they were placed at a 90° angle (17.27 and 14.40 Ncm) compared with those placed at a 60° angle (14.13 and 11.40 Ncm). Conclusions: MIT values were differed according to the vertical mini-implant placement angle in the maxillary posterior area. Regardless of the type of mini-implant used, placement at a 90° angle resulted in a higher MIT.

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