The Use of Microimplants in Orthodontic Anchorage

Chen, Chung-Ho; Chang, Chao-San; Hsieh, Chi-Hsin; Tseng, Yu-Chuan; Shen, Yee-Shyong; Huang, I-Yueh; Yang, Chih-Hui; Chen, Chun‐Ming

doi:10.1016/j.joms.2006.04.016

Cited by 125 publications

(93 citation statements)

References 5 publications

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“…22 The 6-and 8-mm-long MIs were used in the present study because they are the sizes most often used clinically. 1 Bone anatomy is subject to considerable individual variation in terms of cortical bone thickness, which can be relatively well assessed by computed tomography. 22 However, this is not a routine examination in orthodontic clinics.…”

Section: Discussionmentioning

confidence: 99%

“…1,4,8,9,10,11 Some studies have assessed cortical bone thickness and bone density because they are important for the stability of MI. 12,13,14 Using microcomputed tomography, Laursen et al 15 found that the thickness of the alveolar cortical bone was often < 1.0 mm buccally and palatally in the maxilla and buccally in the anterior mandible.…”

Section: Declaration Of Interestsmentioning

confidence: 99%

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Influence of cortical thickness on the stability of mini-implants with microthreads

et al. 2015

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The objective of this study was to assess the influence of cortical thickness and bone density on the insertion torque of a mini-implant (MI) with microthreads. Mini-implants with lengths of 6 and 8 mm in the active part were inserted into synthetic bone blocks (polyurethane resin). The density of these blocks was 20 pounds per cubic foot (pcf), simulating bone marrow, and that of blocks 1, 2, and 3-mm-thick blocks was 40 pcf, simulating cortical bone. Blocks with uniform density of 40 pcf were also used to simulate bone areas of greater density. Insertion torque was quantified with a universal testing machine (EMIC). For both MIs, increasing insertion torque was associated with increasing cortical bone thickness. For the same MI length, significant differences were observed among all assessed groups. The insertion torque of the 6-mm-long MI inserted in a 3-mm-thick cortical bone was equivalent to that of the 8-mm-long MI inserted in a 1-mm-thick cortical bone. MIs inserted in bone blocks of greater density presented insertion torque values almost twice as high as those in other groups. The shorter MI, the lower the insertion torque, and the greater the cortical bone thickness, the greater the insertion torque. To minimize fracture risk, the size of MI should be selected according to the insertion site.

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Section: Discussionmentioning

confidence: 99%

Section: Declaration Of Interestsmentioning

confidence: 99%

Influence of cortical thickness on the stability of mini-implants with microthreads

et al. 2015

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“…All failures occurred in the upper jaw in contrast to reported higher failure rates of miniscrews in the lower jaw. 29,[34][35][36] The latter data, however, were derived from clinical studies in older patients. Only a few studies [37][38][39] have documented the success rates of miniscrews in early teenagers.…”

Section: Discussionmentioning

confidence: 99%

Success rate of miniplate anchorage for bone anchored maxillary protraction

Clerck¹,

Swennen²

2011

The Angle Orthodontist

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Objective: To evaluate the success rate of Bollard miniplate anchorage for bone anchored maxillary protraction (BAMP). Materials and Methods: Twenty-five consecutive patients (mean age, 12.0 6 1.2 years; range, 8.7-14.8 years) with maxillary hypoplasia without congenital or acquired deformation were included in this study. A total of 100 Bollard modified miniplates were placed by the same surgeon. Ninety-nine miniplates were inserted under general anesthesia, and one was placed under local anesthesia because of initially soft bone conditions. Loading of the miniplates with 150 g elastics was initiated at 17.5 6 6.9 days (range, 11-38 days) after surgery. Mean follow-up was provided at 20.8 6 11.1 months (range, 6.5-46.2 months). Results: The overall success rate of miniplate anchorage in terms of stability was 97%. During orthodontic loading, five miniplates showed signs of mobility. After interruption of loading over 2 months, two miniplates became stable again. However, a total of three miniplates needed to be removed and were successfully replaced under local anesthesia after a mean healing period of 3 months. Conclusion: Skeletal anchorage by means of Bollard modified miniplates is effective for BAMP. Success depends on proper presurgical patient counseling, minimal invasive surgery, good postsurgical instructions, and orthodontic follow-up. (Angle Orthod. 2011;81:1010-1013

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“…The basic requirement is sufficient primary stability. 12 To ensure this, different aspects of implant design [13][14][15][16] and insertion protocol [17][18][19][20] should be considered.…”

Section: Introductionmentioning

confidence: 99%

Measurement of mini-implant stability using resonance frequency analysis

Nienkemper

Wilmes

Panayotidis

et al. 2012

The Angle Orthodontist

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Objective: To investigate whether resonance frequency analysis (RFA) is suitable to measure orthodontic mini-implant stability. Implant size significantly affects the level of resonance frequency. Regarding the operating mode of RFA, it has to be proven whether the resonance frequency of mini-implants in bone fits the range of frequency emitted by the Osstell ISQ device. Material and Methods: For this purpose the SmartPegs in the Osstell ISQ device were modified to fit with the inner screw thread of orthodontic mini-implants, and 110 mini-implants were inserted into porcine pelvic bone. RFA was performed parallel and perpendicular to the run of superficial bone fibers. A suitability test, Periotest, was also performed in the same directions. Compacta thickness was measured using cone-beam computed tomography. Correlation tests and linear regression analysis were carried out between the three methods. Results: The RFA showed a mean Implant Stability Quotient value of 36.36 6 2.67, and the Periotest mean value was 22.10 6 1.17. The differences between the two directions of measurement were statistically significant (P . .001) for RFA and the Periotest. There was a high correlation between RFA and the Periotest (r 5 20.90) and between RFA and compacta thickness (r 5 0.71). The comparison between the Periotest and compacta thickness showed a correlation coefficient of r 5 20.64. Conclusion:The present results suggest that RFA is feasible as a measurement method for orthodontic mini-implant stability. As a consequence, it could be used for clinical evaluation of current stability and allow stability-related loading of mini-implants to reduce the failure rate. (Angle Orthod. 2013;83:230-238.)

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The Use of Microimplants in Orthodontic Anchorage

Cited by 125 publications

References 5 publications

Influence of cortical thickness on the stability of mini-implants with microthreads

Influence of cortical thickness on the stability of mini-implants with microthreads

Success rate of miniplate anchorage for bone anchored maxillary protraction

Measurement of mini-implant stability using resonance frequency analysis

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