- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03696511
Miniscrews Primary Stability
October 4, 2019 updated by: Marco Migliorati, University of Genova
Multicentric Clinical Study Protocol on Primary Stability of STORM® Miniscrew
Orthodontic Miniscrew primary stability is essential for success and long term results.
The aim of the present study is to evaluate Bone Properties and Torque insertion values and how they could be related to primary stability and success rate of miniscrew.
Study Overview
Status
Unknown
Conditions
Intervention / Treatment
Detailed Description
Orthodontic miniscrews are intraoral anchorage devices designed to support biomechanics during orthodontic tooth movement.
Also known as miniscrews, mini-implants, microscrews, or temporary anchorage devices, they are made of a head, a neck, and a threaded shank.
The head may show different designs (bracket-like, rounded with slot, etc.) the threaded shank is generally cylindrical, tapered or a combination of the two, and may be self-tapping (i.e.
requiring a pre-drilled pilot hole) and/or self-drilling (not requiring a pilot hole).
Because of their small diameter, they may be implanted in a wide variety of anatomic sites, such as the alveolar interradicular spaces or the palatal cortical bone, in order to attend to treatment anchorage needs.
The loading protocol for miniscrews loading can be as immediate as delayed; in the beginning in literature was indicated a non-specific period of healing and osseointegration before a screw inserted in the mandible could be loaded; the importance of a healing period was derived by several studies on Branemark protocol on implants.
Further experimental studies on orthodontic load were not able to demonstrate loaded implant loosening, even when loads were applied immediately, so that an immediate loading protocol for orthodontic miniscrews appeared as reasonable.
Costa and Melsen studied the tissue reaction around the immediately loaded screws in an animal model and suggested the use of immediately loaded screws as an intra-oral extra-dental anchorage.
Histomorphometric analyses have shown that the immediate loading of miniscrew implants may help to activate bone remodeling and increase the mineral contents at the loaded region.
Compared to traditional endosseous implants, orthodontic miniscrews have relatively high failure rates, varying from 16.4% to 39% ; according to recent reviews, the average failure rate is believed to be less than 20%.
Many factors have been proposed to be associated to success rate; among these age, gender, jaw (maxilla or mandible), placement site, tissue mobility (firm or movable tissue), inflammation, distance to the root, insertion torque, loading time, type, length, and diameter of the miniscrew.
Recently, an experimental study on primary stability found that bone properties are more important than the screw geometry in establishing primary mechanical retention.
Thus the aim of this study is to deeply analyze the bone role related to the success of miniscrews analyzing both insertion/removal torque values, both bone characteristics by the mean of x-rays.
Study Type
Interventional
Enrollment (Anticipated)
30
Phase
- Not Applicable
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
10 years to 68 years (Child, Adult, Older Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- patient who need ortho treatment with miniscrew
- permanent dentition
Exclusion Criteria:
- bone pathologies
- systemic disease
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Active Comparator: group 1:maxillary insertion
Orthodontic miniscrew insertion; maxillary insertion.
buccal
|
orthodontic treatment using miniscrews as anchorage reinforcement
|
Active Comparator: group 2: mandible insertion
Orthodontic miniscrew insertion; mandible insertion.
|
orthodontic treatment using miniscrews as anchorage reinforcement
|
Active Comparator: group 3: palatal insertion
Orthodontic miniscrew insertion; palatal insertion
|
orthodontic treatment using miniscrews as anchorage reinforcement
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Success
Time Frame: From the moment the screw will be placed, measuring maximum insertion torque, through study completion, when the screws will be removed, measuring removal torque. An average duration of screw of 10-12 months is expected.
|
How many screws don't fail.
Success if the screw remain stable until the end of biomechanics applied.
|
From the moment the screw will be placed, measuring maximum insertion torque, through study completion, when the screws will be removed, measuring removal torque. An average duration of screw of 10-12 months is expected.
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
MIT
Time Frame: The date when, for each patient, the miniscrew will be inserted. Registered as the insertion date (day). Up to 12 months from orthodontic therapy beginning. The event is determined from date of randomization list creation until the day of screw insertion
|
miniscrew maximum insertion torque: The moment when the screw will be placed, the maximum insertion torque will be registered at the insertion time, with a analogical screwdriver, measured in Ncm
|
The date when, for each patient, the miniscrew will be inserted. Registered as the insertion date (day). Up to 12 months from orthodontic therapy beginning. The event is determined from date of randomization list creation until the day of screw insertion
|
MRT
Time Frame: The date when, for each patient,the miniscrew will be removed.Registered as the removal date (day).Up to 24 months after miniscrew insertion.The event is determined from date of randomization list creation until the day of screw removal, up to 48 months
|
maximum removal torque.
Maximum removal torque will be recorded using an analogical screwdriver at the completion of screw insertion.
MRT is a unique value expressed in Ncm measured when the screws will be removed.
|
The date when, for each patient,the miniscrew will be removed.Registered as the removal date (day).Up to 24 months after miniscrew insertion.The event is determined from date of randomization list creation until the day of screw removal, up to 48 months
|
Other Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Cortical thickness
Time Frame: At the beginning of the orthodontic treatment, before any dental movement occurred. Time frame is from randomization list and beginning of orthodontic treatment, up to 24 months.
|
cortical thickness measured in mm, a.
Both values will be evaluated on CBCT images acquired before orthodontic treatment beginning
|
At the beginning of the orthodontic treatment, before any dental movement occurred. Time frame is from randomization list and beginning of orthodontic treatment, up to 24 months.
|
Marrow bone density
Time Frame: At the beginning of the orthodontic treatment, before any dental movement occurred. Time frame is from randomization list and beginning of orthodontic treatment, up to 24 months.
|
marrow/cortical bone density measured with HU values.
Images will be evaluated with dedicated software for image analysis
|
At the beginning of the orthodontic treatment, before any dental movement occurred. Time frame is from randomization list and beginning of orthodontic treatment, up to 24 months.
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Publications and helpful links
The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.
General Publications
- Migliorati M, Drago S, Dalessandri D, Lagazzo A, Gallo F, Capurro M, Silvestrini-Biavati A. On the stability efficiency of anchorage self-tapping screws: Ex vivo experiments on miniscrew implants used in orthodontics. J Mech Behav Biomed Mater. 2018 May;81:46-51. doi: 10.1016/j.jmbbm.2018.02.019. Epub 2018 Feb 19.
- Watanabe T, Miyazawa K, Fujiwara T, Kawaguchi M, Tabuchi M, Goto S. Insertion torque and Periotest values are important factors predicting outcome after orthodontic miniscrew placement. Am J Orthod Dentofacial Orthop. 2017 Oct;152(4):483-488. doi: 10.1016/j.ajodo.2017.01.026.
- Inoue M, Kuroda S, Yasue A, Horiuchi S, Kyung HM, Tanaka E. Torque ratio as a predictable factor on primary stability of orthodontic miniscrew implants. Implant Dent. 2014 Oct;23(5):576-81. doi: 10.1097/ID.0000000000000138.
- Watanabe H, Deguchi T, Hasegawa M, Ito M, Kim S, Takano-Yamamoto T. Orthodontic miniscrew failure rate and root proximity, insertion angle, bone contact length, and bone density. Orthod Craniofac Res. 2013 Feb;16(1):44-55. doi: 10.1111/ocr.12003. Epub 2012 Sep 3.
- Migliorati M, Drago S, Gallo F, Amorfini L, Dalessandri D, Calzolari C, Benedicenti S, Silvestrini-Biavati A. Immediate versus delayed loading: comparison of primary stability loss after miniscrew placement in orthodontic patients-a single-centre blinded randomized clinical trial. Eur J Orthod. 2016 Dec;38(6):652-659. doi: 10.1093/ejo/cjv095. Epub 2016 Jan 4.
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start (Actual)
September 29, 2018
Primary Completion (Anticipated)
June 30, 2020
Study Completion (Anticipated)
December 30, 2020
Study Registration Dates
First Submitted
July 18, 2018
First Submitted That Met QC Criteria
October 3, 2018
First Posted (Actual)
October 4, 2018
Study Record Updates
Last Update Posted (Actual)
October 7, 2019
Last Update Submitted That Met QC Criteria
October 4, 2019
Last Verified
October 1, 2018
More Information
Terms related to this study
Keywords
Other Study ID Numbers
- GE-BS-MA MRCT
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
No
Studies a U.S. FDA-regulated device product
No
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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