Effect of Insertion Method and Postinsertion Time Interval Prior to Force Application on the Removal Torque of Orthodontic Miniscrews

Sharifi, Maryam; Ghassemi, Amirreza; Bayani, Shahin

doi:10.11607/jomi.3532

Cited by 3 publications

(2 citation statements)

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“…Removal torque values after 180 days (Group 3) resulted almost the same as the initial torque and it would probably have shown a similar value after 4 weeks only. This interpretation is in contrast with that of Sharifi et al, in fact their study on removal torque in the first 6 weeks showed a reduced value, 29 a finding that is in accordance with previous literature 30,31 . A different analysis could be performed considering the surface type of minsicrews.…”

Section: Discussionsupporting

confidence: 46%

Maximum insertion torque loss after miniscrew placement in orthodontic patients: A randomized controlled trial

Migliorati

Drago

Amorfini³

et al. 2020

Orthod Craniofacial Res

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Objectives To compare torque recordings of immediately loaded orthodontic miniscrews between insertion time and different post‐placement timepoints (2 weeks, 4 weeks and removal time, respectively). Setting and sample population Parallel trial with an allocation ratio of 1:1. Eligibility criteria were needs of fixed orthodontic treatment, no systemic disease and absence of using drugs altering bone metabolism. Material and methods Patients received miniscrews, 2.0 mm diameter and 10 mm length. All miniscrews underwent inter‐radicular placement, and they were placed in the maxilla or in the mandible, palatally or buccally. No pre‐drilling was performed. Miniscrews were loaded immediately after the insertion and were used for distalization, intrusion, extrusion, mesialization or indirect anchorage. Patients were randomly divided into three groups. For each patient, Maximum Insertion Torque (MIT) was evaluated at baseline. MIT was measured again after 2 weeks and after 4 weeks by tightening the screw a quarter of turn in Groups 1 and 2, respectively. At the end of the treatment, maximal removal torque was evaluated in Group 3. Torque variation with respect to insertion time was considered as the primary outcome. Baseline and longitudinal differences were tested using the linear mixed‐effects (LME) model. Results Forty seven patients and 74 miniscrews were followed up. An association existed between maximum insertion torque and the observation time. A torque decrease of 26.9% and 30% after 2 weeks was observed for mandibular and maxillary miniscrews, respectively. After 1 month, torque values were similar to the baseline records. The overall success rate was 79.7%. No serious harm was observed. Conclusions Maximum insertion torque undergoes a loss during the first 2 weeks, and its values may depend on the insertion site and the anchorage purpose. Removal torque value is almost the same as the initial torque after 1 month.

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Section: Discussionsupporting

confidence: 46%

Maximum insertion torque loss after miniscrew placement in orthodontic patients: A randomized controlled trial

Migliorati

Drago

Amorfini³

et al. 2020

Orthod Craniofacial Res

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“…Few investigations exist for prosthodontic implant removal [1,6,16,19] or miniscrew removal (e.g. [2,3,11,18,20]). All these scarce studies remain of little value for comparison, because their differences to the present investigation are too important to be ignored: different loading (prosthodontic vs. orthodontic), region of insertion, TAD dimensions in length, width and overall design, and surface characteristics differ significantly one from each other and disqualify any direct comparison.…”

Section: Discussionmentioning

confidence: 99%

Factors influencing the removal torque of palatal implant used for orthodontic anchorage

2021

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Background A non-invasive method has recently been introduced to remove osseo-integrated palatal implants by using the implantation ratchet which is designed to screw in or unscrew the implants. Although a proof of concept has been published, the torque involved to successfully explant have not been investigated so far. The aim of this study was to assess the removal torque required to explant osseo-integrated and orthodontically utilized palatal implants, and to identify potentially influencing variables. Materials and method Thirty-one consecutive patients (15 females, 16 males; mean age 24.1 ±7.4 years) with fully osseo-integrated and previously orthodontically loaded palatal implants (Orthosystem®: diameter 4.1mm/length 4.2mm/sandblasted with large grits (SLA) surface) were randomly assigned to either clockwise or counter-clockwise non-invasive explantation. The respective explantation tool with an electric torque control was placed on the abutment connection of the implant and secured by an occlusal screw. The primary outcome studied was maximal removal torque (MRT) needed to detach the implant from its socket which was recorded individually together with other potentially influencing secondary outcomes (gender, age, orthodontic loading time, use of local anaesthetics). Student’s t-test was used to contrast MRT difference for the gender, type of suprastructure, use of local anaesthetics, and rotational direction. Spearman correlations was used to investigate associations between MRT and patient’s age or duration loading time. Results Average MRT (148.6 ± 63.2N/cm) using ratchet as a non-invasive removal method of palatal implant was considered safe. The triangular head fractured of palatal implant at a torque level of 300.1 Ncm. Significantly higher explantation were recorded for male patients compared to female patients (182.0 ± 63.0 Ncm vs 112.8 ± 40.8 Ncm; P=0.001). On the other side, the mean removal torque for palatal removal in clockwise direction was non-significantly different (158.3 ± 58.6 Ncm) compared to counter-clockwise direction (139.4 ± 67.9 Ncm). Neither patient’s age (p=0.324) nor loading time (p=0.214) were significantly correlated with removal torque values. Conclusions Pertinent literature on this subject is practically non-existent, as orthodontics is presumably the only discipline where implant removal represents a treatment success. Mean MRT for successful palatal implant removal was 148.6±63.2Ncm, but a large spectrum was observed (minimum 31.5Ncm, maximum 272.8Ncm). This obvious heterogeneity underlines the importance to investigate possible influencing factors. The safe and simple non-invasive method for palatal implant removal necessitates moderate, but not high torque MRTs, independently of the torque direction. The necessary MRT seems clearly influenced by gender, but less so by patient’s age or loading time.

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Success rate and strength of osseointegration of immediately loaded UV-photofunctionalized implants in a rat model

Soltanzadeh

Ghassemi

Ishijima³

et al. 2017

The Journal of Prosthetic Dentistry

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Effect of Insertion Method and Postinsertion Time Interval Prior to Force Application on the Removal Torque of Orthodontic Miniscrews

Cited by 3 publications

References 0 publications

Maximum insertion torque loss after miniscrew placement in orthodontic patients: A randomized controlled trial

Maximum insertion torque loss after miniscrew placement in orthodontic patients: A randomized controlled trial

Factors influencing the removal torque of palatal implant used for orthodontic anchorage

Success rate and strength of osseointegration of immediately loaded UV-photofunctionalized implants in a rat model

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