scholarly journals Rotational Resistance of Surface-Treated Mini-Implants

2009 ◽  
Vol 79 (5) ◽  
pp. 899-907 ◽  
Author(s):  
Seong-Hun Kim ◽  
Shin-Jae Lee ◽  
Il-Sik Cho ◽  
Seong-Kyun Kim ◽  
Tae-Woo Kim
Keyword(s):  
Angular Momentum ◽  
Total Energy ◽  
Surface Treatment ◽  
Mixed Model ◽  
Block Design ◽  
Insertion Torque ◽  
Success Rates ◽  
Machined Surface ◽  
Mini Implants ◽  
Significant Difference

Abstract Objective: To test the hypothesis that there is no difference in the stability and resistance to rotational moments of early loaded sandblasted and acid-etched (SLA) mini-implants and those of machined-surface implants of the same size and shape. Materials and Methods: A randomized complete block design was used in 12 skeletally mature male beagle dogs. Ninety-six orthodontic mini-implants were tested. Two types of implants were used: some had SLA surface treatment and some had machined surfaces without coating. After 3 weeks of healing, rotational moments of 150 g were applied. The success rates, maximum torque values, angular momentum, and total energy absorbed by the bone were compared. All values were subjected to mixed-model analysis to evaluate the influence of surface treatment, rotational force direction, and site of implantation. Results: The maximum insertion torque and angular momentum of SLA implants were significantly lower than those of machined implants (P = .034, P = .039). The SLA implants had a significantly higher value for total removal energy than the machined implants (P = .046). However, there were no significant differences in total insertion energy, maximum removal torque, and removal angular momentum between the 2 groups. There was no significant difference between clockwise and counterclockwise rotation in all measurements. Conclusion: SLA mini-implants showed relatively lower insertion torque value and angular momentum and higher total energy during removal than the machined implants, suggesting osseointegration of the SLA mini-implant after insertion.

scholarly journals A prospective, split-mouth, clinical study of orthodontic titanium miniscrews with machined and acid-etched surfaces

2018 ◽  
Vol 89 (3) ◽  
pp. 411-417 ◽  
Author(s):  
Hyo-Jin Park ◽  
Sung-Hwan Choi ◽  
Yoon Jeong Choi ◽  
Young-Bum Park ◽  
Kwang-Mahn Kim ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Success Rate ◽  
Controlled Trial ◽  
Primary Stability ◽  
Open Bite ◽  
Success Rates ◽  
Machined Surface ◽  
Significant Difference ◽  
Etched Surface ◽  
High Possibility

ABSTRACT Objectives: To determine whether the success rate and primary stability of surface-treated miniscrews differ from those of nontreated miniscrews. Materials and Methods: Patients who required one or more miniscrews for the same reason in each quadrant were recruited into a single-blinded, split-mouth, randomized, controlled trial with a 1:1 allocation ratio. Self-drilling miniscrews with two surface types were used: those with no surface treatment, and those with an acid-etched surface treatment. The cumulative success rate and primary stability of each type of miniscrew were examined, and factors potentially affecting the success and failure of miniscrews were investigated. Results: Forty patients were included in the study, with a total of 98 orthodontic miniscrews. The overall success rate was 88.8%, and the respective success rates for acid-etched and machined surface miniscrews were 91.8% and 85.7%. The respective mean insertion torques were 13.62 ± 5.95 N·cm and 13.38 ± 4 N·cm, and periotest values measured immediately after insertion were −0.50 ± 2.77 for acid-etched miniscrews and −0.28 ± 3.36 for machined surface miniscrews. There was no significant difference in the mean insertion torques and periotest values according to surface treatment and jaw. Conclusions: Neither the success rate nor the primary stability of acid-etched surface miniscrews and machined surface miniscrews differed significantly. There is a high possibility that miniscrews will fall out in patients who have an open bite or those who require total distalization.

scholarly journals Mechanical and Histological Effects of Resorbable Blasting Media Surface Treatment on the Initial Stability of Orthodontic Mini-Implants

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Odontuya Gansukh ◽  
Jong-Wha Jeong ◽  
Jong-Wan Kim ◽  
Jong-Ho Lee ◽  
Tae-Woo Kim
Keyword(s):  
Bone Resorption ◽  
Surface Treatment ◽  
Histological Study ◽  
Machined Surface ◽  
Bone Apposition ◽  
Mini Implants ◽  
Initial Stability ◽  
Significant Difference ◽  
Mechanical Study ◽  
Bone To Implant Contact

Introduction. This study aimed to evaluate the effects of resorbable blasting media (RBM) treatment on early stability of orthodontic mini-implants by mechanical, histomorphometric, and histological analyses.Methods. Ninety-six (64 for mechanical study and 32 for histological study and histomorphometric analysis) titanium orthodontic mini-implants (OMIs) with machined (machined group) or RBM-treated (CaP) surface (RBM group) were implanted in the tibiae of 24 rabbits. Maximum initial torque (MIT) was measured during insertion, and maximum removal torque (MRT) and removal angular momentum (RAM) were measured at 2 and 4 weeks after implantation. Bone-to-implant contact (BIC) and bone area (BA) were analyzed at 4 weeks after implantation.Results. RBM group exhibited significantly lower MIT and significantly higher MRT and RAM at 2 weeks than machined group. No significant difference in MRT, RAM, and BIC between the two groups was noted at 4 weeks, although BA was significantly higher in RBM group than in machined group. RBM group showed little bone resorption, whereas machined group showed new bone formation after bone resorption.Conclusions. RBM surface treatment can provide early stability of OMIs around 2 weeks after insertion, whereas stability of machined surface OMIs may decrease in early stages because of bone resorption, although it can subsequently recover by new bone apposition.

Insertion torque values and success rates for paramedian insertion of orthodontic mini-implants

2018 ◽  
Vol 79 (2) ◽  
pp. 109-115 ◽  
Author(s):  
Bruno Di Leonardo ◽  
Björn Ludwig ◽  
Jörg Alexander Lisson ◽  
Luca Contardo ◽  
Rossano Mura ◽  
...  
Keyword(s):  
Insertion Torque ◽  
Success Rates ◽  
Mini Implants ◽  
Torque Values

scholarly journals Low-Level Laser Therapy with a 635 nm Diode Laser Affects Orthodontic Mini-Implants Stability: A Randomized Clinical Split-Mouth Trial

2019 ◽  
Vol 9 (1) ◽  
pp. 112 ◽  
Author(s):  
Rafał Flieger ◽  
Tomasz Gedrange ◽  
Kinga Grzech-Leśniak ◽  
Marzena Dominiak ◽  
Jacek Matys
Keyword(s):  
Total Energy ◽  
Laser Irradiation ◽  
Diode Laser ◽  
Control Group ◽  
Laser Application ◽  
Pain Level ◽  
Mini Implants ◽  
Attached Gingiva ◽  
Significant Difference ◽  
Secondary Stability

Background: The study aimed to clinically estimate an influence of a 635 nm diode laser on the stability of orthodontic mini-implants, to assess mini-implants loss, and to evaluate a pain level after the treatment. Materials and Methods: The randomized clinical split-mouth trial included 20 subjects (13 women and 7 men; age: 32.5 ± 6.1 years), 40 implants (RMO, West Colfax Ave., Denver, CO, USA) with a diameter 1.4 mm and length of 10 mm. Mini-implants were placed in the area of the attached gingiva between the second premolar and first molar teeth, 2 mm below the mucogingival junction of both sides of the maxilla. Each implant on the right side (G1, n = 20) of the maxilla was irradiated with a diode laser, and the implants on the opposite side (left, G2, n = 20) were a control group (without laser irradiation). The 635-nm laser parameters; dose: 10 J per point (20 J/cm2), time: 100 s per point, two points (irradiation on a buccal, and a palatal side of the alveolus/implant), the total energy per session 20 J. Laser application protocol: immediately and 3, 6, 9, 12, 15, and 30 days after surgery. The total energy after all therapeutic sessions was 140 J. The implants’ stability was measured employing a Periotest device (Periotest Test Value—PTV) immediately and 3, 6, 9, 12, 15, 30, and 60 days after the insertion of the mini-implants. Results: We found significantly higher secondary stability, lower mean PTV (6.18 ± 5.30) and (1.51 ± 2.25), for self-drilling mini-implants (G1, test group) in contrast to the control, G2 group (9.17 ± 8.25) and (5.00 ± 3.24), after 30 (p = 0.0003) and 60 days (p = 0.0000). Moreover, the analysis of the mini-implants stability after 635-nm diode laser application revealed significant higher stability in comparison with none irradiated implants (G2 group) after 3 days. (p = 0.0000) There was no significant difference in pain level measured on the NRS-11 scale on both sides of the maxilla. (p = 0.3665) An important finding was that all inserted mini-implants survived during a two-month observation period. Conclusions: 635-nm diode laser at laser irradiation increases the secondary stability of orthodontic mini-implants.

scholarly journals In Vitro Microstructural Analysis of Dental Implants Subjected to Insertion Torque and Pullout Test

2014 ◽  
Vol 25 (4) ◽  
pp. 343-345 ◽  
Author(s):  
Mariana Lima da Costa Valente ◽  
Cesar Penazzo Lepri ◽  
Andréa Candido dos Reis
Keyword(s):  
Surface Treatment ◽  
Dental Implants ◽  
Chemical Elements ◽  
Microstructural Analysis ◽  
Pullout Test ◽  
Mechanical Tests ◽  
Insertion Torque ◽  
Machined Surface ◽  
Double Surface

The change in the implant microstructure during handling may reduce the potential of surface treatment on the osteoinduction and, therefore, on the osseointegration. The aim of this study was to evaluate by energy-dispersive X-ray spectroscopy (EDX) the effect of insertion torque and pullout test on the microstructure of dental implants with different shapes. Four shapes of implants (n=8) were selected: conical with surface treatment (COTS), cylindrical with surface treatment (CTS), cylindrical with double surface treatment (CTSD) and cylindrical with machined surface (CSU). Before and after performing the mechanical tests, the screw surfaces were subjected to analysis of chemical composition by EDX. The results obtained by the microstructural analysis showed presence of three main chemical elements: Ti, C and O. There was a significant change in the concentration of Ti and C. The implant with double surface treatment (CTSD) showed the greatest Ti reduction and the greatest C increase. It may be concluded that the mechanical manipulation may alter the implant surfaces as regards their microstructure. Therefore, surgical planning should take into consideration the choice of surface treatment because the characteristics of the implants may be modified as they are inserted and removed from the bone site.

scholarly journals Evaluation of Stability of Surface-Treated Mini-Implants in Diabetic Rabbits

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Nam-Hee Oh ◽  
Eun-Young Kim ◽  
Janghyun Paek ◽  
Yoon-Ah Kook ◽  
Do-Min Jeong ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Primary Stability ◽  
Surface Group ◽  
Diabetic Group ◽  
Control Group ◽  
Insertion Torque ◽  
Control Groups ◽  
Mini Implants ◽  
Diabetic Rabbits ◽  
And Control

Introduction. The purpose of this study was to investigate effects of surface treatment of mini-implants in diabetes-induced rabbits by comparing osseointegration around mini-implants.Methods. Twelve New Zealand white rabbits were divided into two groups (alloxan-induced diabetic group and control group). A total of 48 mini-implants were placed after four weeks of diabetic induction. 24 mini-implants were surface-treated with SLA (sandblasted with large grit, and acid etched) and the remaining 24 mini-implants had smooth surfaces. Four weeks after placement, 32 mini-implants were removed from 4 control and 4 diabetic rabbits. Insertion and removal torques were measured. The remaining 16 mini-implants from the two groups were histomorphometrically analyzed.Results. Maximum insertion torque showed no difference between diabetic and control groups, but total insertion energy was higher in control group. In surface-treated mini-implants, maximum removal torque was higher in both diabetic and control groups. Bone-implant contact (BIC) was increased in the control group when compared to the diabetic group. Surface-treated group had higher BIC than smooth surface group in both control and diabetic groups. However, there was no significantly statistical difference.Conclusions. Type 1 diabetes mellitus and surface treatment method of mini-implant affected primary stability of mini-implants. In addition, the use of orthodontic mini-implants in a diabetic patient is likely to show results similar to the healthy patient.

scholarly journals Fracture Resistance of Commonly Used Self-drilling Mini-implants of Various Diameters

2020 ◽  
Vol 54 (1) ◽  
pp. 31-38
Author(s):  
Vinodh S. ◽  
B. Sangamesh ◽  
Neelakantha Patil V. ◽  
Sameer Ahmed ◽  
Venkat Naidu B.
Keyword(s):  
Analysis Of Variance ◽  
Fracture Resistance ◽  
Insertion Torque ◽  
Limited Information ◽  
Mini Implants ◽  
Significant Difference ◽  
Bonferroni Test ◽  
Different Diameters ◽  
Treatment Procedures ◽  
Post Hoc

Context: Self-drilling mini-implants are commonly used in orthodontic treatment procedures, but there is limited information regarding their fracture resistance in areas of high-density bone without predrilling. Aims: The objective of this study is to compare and evaluate the maximum insertion torque and fracture resistance of 3 commonly used self-drilling mini-implants in India, and to assess the influence of variation in diameter in torque generation. Materials and methods: 90 mini-implants from 3 different manufacturers with 2 different diameters were drilled into acrylic blocks using a dial indicating torque screwdriver. All mini-implants were drilled at the rate of 20-30 rotations/min, implants were drilled until they fractured. Torque generated at the point of fracture is shown on the dial of the screwdriver. Measurements of the peak insertion torque value for each manufacturer were recorded separately. Statistical analysis: Analysis of variance, post hoc Bonferroni test. Results: Analysis of variance test showed a significant difference among all the manufacturers in both the diameters with P < .05. Implants of 1.6 mm diameter of Ancer group have the highest fracture resistance value when compared with the same diameter of JJ Orthodontics and SK Surgicals. Implants with higher diameter have more resistance than those with lower diameter. Conclusions: The observed highest fracture resistance is 47 Ncm by Ancer and least fracture resistance is 16 Ncm by JJ Orthodontics. The values are higher than the torque required to place mini-implants intraorally. Ancer mini-implants have the highest peak fracture torque, thus more than SK Surgicals and JJ Orthodontics.

scholarly journals Effects of wobbling angle on the stability measures of orthodontic mini-implants during insertion and removal procedures

2013 ◽  
Vol 83 (6) ◽  
pp. 1009-1014 ◽  
Author(s):  
Il-Sik Cho ◽  
Sang-Ho Baek ◽  
Young Ho Kim
Keyword(s):  
Insertion Torque ◽  
Peak Time ◽  
Cylindrical Shape ◽  
Artificial Bone ◽  
Removal Torque ◽  
Mini Implants ◽  
Significant Difference ◽  
The Stability ◽  
Driving Torque ◽  
Maximum Removal

ABSTRACT Objective: To investigate the effects of wobbling angle on the stability measures of orthodontic mini-implants (OMIs) during insertion and removal procedures in artificial bone blocks. Materials and Methods: A total of 36 OMIs (self-drilling type, cylindrical shape, 7 mm in length, 1.45 mm in diameter) were allocated into three groups according to the amount of wobbling angle (W-0°, W-2°, and W-4° groups; N = 12 per group). The OMIs were installed and subsequently removed from artificial bone blocks (Sawbone) using a driving torque tester with a uniform speed of 28 rpm. Insertion peak time (IPT), maximum insertion torque (MIT), total insertion energy (TIE), near-peak insertion energy (NPIE), maximum removal torque (MRT), and near-peak removal energy (NPRE) were measured. Results: The W-4° group showed the longest IPT and highest TIE and NPIE, followed by the W-2° and W-0° groups (W-0° &lt; W-2° &lt; W-4°, all P &lt; .001). The W-2° and W-4° groups showed significant increase in MIT compared with the W-0° group (W-0° &lt; [W-4°,W-2°]; P &lt; .001). Although there was no significant difference in NPRE among the three groups, the W-4° group showed a decrease in MRT compared with the W-0° and W-2° groups (W-4° &lt; {W-2°,W-0°]; P &lt; .05). Although the W-4° group showed a 14.5% (2.9 Ncm) increase in MIT compared with the W-0° group, there was only a 6% (1.3 Ncm) decrease in MRT from the W-0° group to the W-4° group. Conclusion: Slight wobbling during the OMI insertion procedure may be acceptable in terms of the stability measures of OMIs during insertion and removal procedures.

scholarly journals Effects of the Taper Shape, Dual-Thread, and Length on the Mechanical Properties of Mini-Implants

2009 ◽  
Vol 79 (5) ◽  
pp. 908-914 ◽  
Author(s):  
Young-Kyun Kim ◽  
Yoon-Ji Kim ◽  
Pil-Young Yun ◽  
Jong-Wan Kim
Keyword(s):  
Angular Momentum ◽  
Mechanical Stability ◽  
Mechanical Analysis ◽  
Surrounding Tissue ◽  
Insertion Torque ◽  
Cylindrical Shape ◽  
Removal Torque ◽  
Mini Implants ◽  
Length Group ◽  
Maximum Removal

Abstract Objective: To analyze the mechanical effects of the length and the various shapes such as cylindrical shape, taper shape, and dual-thread shape on the insertion and removal torque of mini-implants. Materials and Methods: Mini-implants (diameter 1.6 mm and length 6 mm and 8 mm) consisting of cylindrical, taper, and dual-thread groups were inserted and removed in Sawbones while measuring the torque and time. Mechanical analysis was done of maximum insertion torque (MIT), maximum removal torque (MRT), torque ratio (TR; MRT/MIT), insertion angular momentum (IAM), removal angular momentum (RAM), and time of MIT. Measurements were statistically evaluated to analyze any differences of shapes and lengths. Results: The cylindrical shape had the lowest MIT and MRT in each length. Although taper shape showed the highest MIT in each length, dual-thread shape showed significantly higher MRT, TR, and RAM in each length (P &lt; .05). Dual-thread groups showed a gentle increase of insertion torque and a gentle decrease of removal torque in contrast to the other shape groups. However, it had higher IAM and time of MIT. The long length group showed significantly higher measurements except for TR. Conclusions: Dual-thread shape provided better mechanical stability with high removal torque on the broad range than other shapes. However, dual-thread shape may need improvement for reducing the long insertion time to decrease the stress to the surrounding tissue.

scholarly journals Stability of smooth and rough mini-implants: clinical and biomechanical evaluation - an in vivostudy

2015 ◽  
Vol 20 (5) ◽  
pp. 35-42
Author(s):  
Giselle Naback Lemes Vilani ◽  
Antônio Carlos de Oliveira Ruellas ◽  
Carlos Nelson Elias ◽  
Cláudia Trindade Mattos
Keyword(s):  
Surface Treatment ◽  
Primary Stability ◽  
Insertion Torque ◽  
Behavioral Difference ◽  
Removal Torque ◽  
Mini Implants ◽  
Biomechanical Evaluation ◽  
The Right

Objective: To compare in vivo orthodontic mini-implants (MI) of smooth (machined) and rough (acid etched) surfaces, assessing primary and secondary stability.Methods:Thirty-six (36) MI were inserted in the mandibles of six (6) dogs. Each animal received six (6) MI. In the right hemiarch, three (3) MI without surface treatment (smooth) were inserted, whereas in the left hemiarch, another three (3) MI with acid etched surfaces (rough) were inserted. The two distal MI in each hemiarch received an immediate load of 1.0 N for 16 weeks, whereas the MI in the mesial extremity was not subject to loading. Stability was measured by insertion and removal torque, initial and final mobility and by inter mini-implant distance.Results:There was no statistical behavioral difference between smooth and rough MI. High insertion torque and reduced initial mobility were observed in all groups, as well as a reduction in removal torques in comparison with insertion torque. Rough MI presented higher removal torque and lower final mobility in comparison to smooth MI. MI did not remain static, with displacement of rough MI being smaller in comparison with smooth MI, but with no statistical difference.Conclusions:MI primary stability was greater than stability measured at removal. There was no difference in stability between smooth and rough MI when assessing mobility, displacement and insertion as well as removal torques.

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