An interventional study of Electric stimulation removabel device and Traditional retraction method. in Class II Division 1 Malocclusion, sponsored by Damascus University. Completed at 1 site in Syrian Arab Republic. Open to participants aged 16 Years to 25 Years. Per ClinicalTrials.gov, last updated 2025-03-12.
Sponsored by Damascus University · Not applicable, Interventional, and Treatment
This RCT will include 34 patients requiring en-masse retraction of upper anterior teeth after maxillary first premolars extraction.
Patients accepted into the study will be randomly assigned to one of two groups in a 1:1 allocation ratio: the electrically stimulated en-masse retraction group (ESER) and the conventional en-masse retraction group (CER). In both groups, the upper anterior teeth will be retracted en masse by applying 250 g of force on each side using closed nickel-titanium coil springs. Mini-implants will be used to provide the maximum anchorage.
The outcomes of the study will be the external apical root resorption (EARR) and the periodontal status of the upper anterior teeth during the treatment stages.
Young adult patients who visit the Department of Orthodontics at Damascus University-Faculty of Dentistry during the sample collection period will be examined to determine the orthodontic treatment plan. Written informed consent will be obtained from all patients who meet the inclusion criteria and accept to participate in the trial.
Before starting the leveling and alignment procedures on the maxillary dental arch, skeletal anchorage will be secure on the maxillary dental arch using self-drilling mini-implants (1.6 * 8 mm; 3S screw, Hubit™, Seoul, Korea) that will apply between the roots of the maxillary first molars and the second premolars. The patients will be referred for maxillary first premolars extraction at the Department of Maxillofacial Surgery, Damascus University, Faculty of Dentistry.
This study will use fixed orthodontic appliances with an MBT prescription and a 0.022-inch bracket slot (VotionTM, Ortho Technology, Florida, USA). The two groups will follow a uniform wire sequence starting from a 0.014-inch NiTi wire until they reach the 0.019*0.025-inch stainless steel basic archwire, with a 3-week interval between each wire.
The sliding technique will be used for en-masse retraction in both study groups. An orthodontic force of approximately 500 g (250 g on each side) will be applied to the crimpable hooks using bilateral closed coil nickel titanium springs (NT3 closed coil springs, American Orthodontics, Sheboygan, Wisconsin) anchored to orthodontic mini-screws. Patients will be followed up every 2 weeks during this phase to adjust the springs to maintain a constant force. The endpoint of en-masse retraction in both groups will be determined when the maxillary canines achieve a Class I relationship with the mandible and a normal incisor relationship.
The removable electrical stimulation device utilized in the study by Shaadouh et al.. to provide the electrical stimulation will be used in this trial for the same purpose.
Each patient in the low-intensity electrical stimulation group will be asked to wear a removable device for five hours daily until the completion of the retraction of the upper anterior teeth.
To evaluate external apical root resorption (EARR), digital panoramic radiographs will be taken at three time points: before orthodontic treatment (T0), before en-masse retraction (T1), and after en-masse retraction (T2). The ImageJ software (NIH and LOCI, Madison, Wisconsin, USA) was used to analyze these radiographs. The method, originally described by Linge and Linge will be used to calculate the root resorption.
The gingival index (GI), the papillary bleeding index (PBI), and the dental plaque index (DPI) will be measured on the upper anterior teeth at the previous assessment times.
124 studies on the registry are indexed under Malocclusion, Angle Class II; 19 are open to participants now.
This study's enrollment of 34 is close to the median of 34 across 115 interventional studies indexed under Malocclusion, Angle Class II.
Browse Malocclusion, Angle Class II studies →Damascus University is the lead sponsor of 212 studies on the registry; 11 are open to participants now.
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Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Class II Division 1 malocclusion :
Good oral and periodontal health:
Exclusion Criteria:
Poor oral hygiene or Current periodontal disease:
Probing depth ≥ 4 mm Radiographic evidence of bone loss Gingival index > 1 Plaque index > 1
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Electric current will be applied in this group of patients using a removable device.
Device: Electric stimulation removabel device
No acceleration method will be performed in this group. Only the traditional method of retraction will be followed.
Procedure: Traditional retraction method.
The device will be used to stimulate orthodontic tooth movement through a specific design used to deliver the current to the mucosa around the teeth being retracted.
In this intervention, the upper anterior teeth will be retracted together backward using the traditional retraction method. No acceleration devices will be used in conjunction with this procedure.
Change in external apical root resorption
The root length will be measured for each root of six upper anterior teeth. The method originally described by Linge and Linge will be used. The amount of root resorption (in millimeters) will be calculated using the following equation: Root Resorption = Root Length (T0) - (Root Length (T1) × Correction Factor). The Correction Factor will be calculated by dividing the crown Length (T0) to the crown Length (T1).
Time frame: The digital panoramic radiographs will be taken at: (T1) one day before treatment commencement, (T2) at the end of the levelling stage (expected to occur within 3 - 4 months), (T3) one day after the end of retraction (expected to occur within 6 months).
Change in the Gingival Index
Assessment will be performed using a gingival probe according to Silness and Loe. (0) = Normal gingiva. 1. = Mild inflammation: slight color change, slight edema. No bleeding on probing. 2. = Moderate inflammation: redness, edema and glazing. Bleeding on probing. 3. = Sever inflammation: marked redness and edema, ulceration, and tendency to spontaneous bleeding
Time frame: Evaluation will be performed at: (T1) one day before treatment commencement, (T2) at the end of the levelling stage (expected to occur within 3 - 4 months), (T3) one day after the end of retraction (expected to occur within 6 months).
Change in the Dental Plaque index
Assessment will be performed using a gingival probe according to Silness and Loe. (0) = No plaque. 1. = A film of plaque adhering to the free gingival margin and adjacent area of the tooth. The plaque may be seen in situ only after disclosing solution or using the probe on the tooth surface. 2. = Moderate accumulation of soft deposits within the gingival pocket, or on the tooth and gingival margin, which can be seen with the naked eye. 3. = Abundance of soft matter within the gingival pocket and/or the tooth and gingival margin.
Time frame: Evaluation will be performed at: (T1) one day before treatment commencement, (T2) at the end of the levelling stage (expected to occur within 3 - 4 months), (T3) one day after the end of retraction (expected to occur within 6 months).
Change in the Bleeding Index
The Bleeding index will be used to assess the status of periodontal tissues and the amount of congestion in the gingival margins around the anterior teeth. According to Muhlemann, an assessment will be performed using a gingival probe. (0) = No bleeding. 1. = A single discrete bleeding point appears. 2. = Several isolated bleeding points or a single fine line of blood appears. 3. = The interdental triangle fills with blood shortly after probing. 4. = Profuse bleeding occurs after probing; blood flows immediately into the marginal sulcus.
Time frame: Evaluation will be performed at: (T1) one day before treatment commencement, (T2) at the end of the levelling stage (expected to occur within 3 - 4 months), (T3) one day after the end of retraction (expected to occur within 6 months).
Change in Gingival Recession
This will be measured in millimeters from the cement-enamel junction to the gingival margin level around the six anterior teeth.
Time frame: Evaluation will be performed at: (T1) one day before treatment commencement, (T2) at the end of the levelling stage (expected to occur within 3 - 4 months), (T3) one day after the end of retraction (expected to occur within 6 months).
Plan to share: No
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Malocclusion, Angle Class II →