Positional and Dimensional Tmj Changes Following the Use of Different Class II Correctors in a Sample of Erbil City [Randomized Clinical Trial]

This study aimed to assess and compare the positional and dimensions changes in the Temporomandibular Joint disc resulting from various class II correctors before and after correcting the class II molar relation using MRI.

Randomized, triple-blinded clinical trial of three groups of 13 patients in a single center

All patients, and who did data income analysis and statistician are unaware of grouping.

Inclusion criteria were set: 1. Clinical manifestation of a retrognathic mandible, as determined by cephalometric study, with an ANB angle larger than 4֯, due to the retrognathic mandible [SNB angle < 78◦] 2. Permanent dentition with angle Class II division 1 malocclusion with no missing or history of extraction. 3. Patients without history of TMJ dislocation or pain. 4. No history of orthodontic treatment. 5. Complete treatment records [cephalometric and panoramic X-ray, photography, and digital study models]. 6. Absence of transverse pre-treatment discrepancy. 7. Non-extraction treatment strategy and Class I occlusal relationship following treatment. 8. Cervical vertebrae maturation stages 4,5, and/or 6 in healthy pro-pubertal patients [17]. Patients having a history of trauma or TMJ operations, severe TMDs, systemic issues such as pregnancy, former orthodontic treatment, claustrophobia, or dental appliances or restorations that could have compromised patient safety during an MRI scan were not included in the study.

the patients were allocated into three groups of 13 individuals each: Power scope 2[American Orthodontics], SARA-Sabagh Advanced Repositioning Appliance [Forestadent, Germany], CS-2000® Niti spring class II corrector [Dyna flex].

position and dimension of the articular disc, position of condyle

The study participants will be randomly assigned to different groups using an online randomization strategy developed by online software available on the website. https://www.graphpad.com/quickcalcs/. The allocation ratio will be determined as 1:1:1. The researchers involved in the study will be unaware of the group assignment. Following the initial clinical and radiological assessment, the patients will beallocated into three groups of 13 individuals each: Power scope 2[American Orthodontics], SARA-Sabagh Advanced Repositioning Appliance [Forestadent, Germany], CS-2000® Niti spring class II corrector [Dyna flex].

Three groups of patients don't know which type of device will be used and the person who will do analysis of investigation and also who will do statistical analysis, are unaware of the randomization of groups.

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