Class II Malocclusion, Mandibular Retrognathism
Conditions
Keywords
Class II malocclusion, Twinblock, clear aligners, mandibular advancement
Brief summary
This prospective clinical study aimed to compare the skeletal and dentofacial effects of Twin Block (TWB) and clear aligners with mandibular advancement, and to evaluate mandibular trabecular bone changes through fractal analysis (FA).
Detailed description
A total of 34 patients with dentoskeletal Class II malocclusion were included in the study: 16 patients in the Invisalign® Mandibular Advancement (MA) group and 18 patients in the TWB group .Panoramic and lateral cephalometric radiographs were obtained at baseline(T0) and after functional treatment(T1). Skeletal, dental, and soft tissue structures were evaluated on the pretreatment and posttreatment radiographs using cephalometric analysis, while trabecular bone architecture was assessed by fractal analysis.
Interventions
DEVICEInvisalign Clear Aligners
Functional appliances are used for mandibular advancement in the treatment of mandibular retrognathia in orthodontics. The Twinblock is a conventional functional appliance, and nowadays mandibular advancement can also be achieved with clear aligners. In this study, these two appliances were used.
DEVICETwinblock Functional Appliance
Functional appliances are used for mandibular advancement in the treatment of mandibular retrognathia in orthodontics. The Twinblock is a conventional functional appliance, and nowadays mandibular advancement can also be achieved with clear aligners. In this study, these two appliances were used.
Sponsors
Bezmialem Vakif University
Study design
Allocation
NON_RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
10 Years to 14 Years
Healthy volunteers
No
Inclusion criteria
* Patients with Angle Class II molar and canine relationship * Overjet greater than 6 mm * Patients in the growth spurt period
Exclusion criteria
* History of orthodontic treatment * Missing teeth * Patients in mixed dentition period * Systemic diseases affecting growth or bone metabolism
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change from Baseline in Cephalometric Measurements (mm and degrees) After Functional Appliance Therapy | Baseline and after completion of functional appliance therapy (approximately 7-13 months) | Cephalometric measurements will be evaluated on lateral cephalometric radiographs using a customized analysis derived from Steiner, McNamara, Tweed, Ricketts, and Arnett analyses. A total of 47 skeletal, dental, airway, hyoid, and soft tissue parameters will be assessed. Linear measurements will be recorded in millimeters (mm) and angular measurements in degrees. Landmarks will be manually identified on digital lateral cephalometric radiographs. |
| Change from Baseline in Mandibular Bone Fractal Dimension Values After Functional Appliance Therapy | Baseline and after completion of functional appliance therapy (approximately 7-13 months) | Fractal dimension values will be calculated using the box-counting method on panoramic radiographs (mandibular condyle, angulus, and corpus) and lateral cephalometric radiographs (symphysis). Fractal dimension is a unitless numerical value used to evaluate trabecular bone complexity. Higher values indicate greater trabecular complexity, whereas lower values indicate reduced trabecular structure. |
Countries
Turkey (Türkiye)
Contacts
STUDY_CHAIREzgi Sunal Akturk, Assistant Professor
Saglik Bilimleri Universitesi
STUDY_CHAIRGokmen Kurt, Professor
Bezmialem Vakif University
PRINCIPAL_INVESTIGATORAhsen Irem Toktas, Research Assistant
Bezmialem Vakif University
Outcome results
None listed