Objective: to evaluate the dentoskeletal effects of CAD/CAM 3D-Printed fixed twin block versus MARA appliances in the management of skeletal class II due to Mandibular Deficiency in Preadolescence Class II malocclusion is considered one of the most commonly observed problems among orthodontic patients, representing around one-third of the patients seeking orthodontic treatment reflecting a significant economic impact. Various removable and fixed functional appliances are commonly used to stimulate mandibular growth. Fixed Twin-block appliance has advantages compared with removable Twin-block and Herbst appliances. The mandibular anterior repositioning appliance is referred to as M.A.R.A. appliance. Materials and method: The study design is a randomized controlled trial in which the control group and intervention groups will be assessed as parallel groups with a 1:1:1 allocation ratio. Sixty subjects will be enrolled in this research. They will be divided equally into three groups: untreated control, MARA group and Twin block group
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
60
CAD/CAM 3D printed mandibular anterior repositioning appliance
CAD/CAM 3D printed fixed twin block
Faculty of dentistry, Mansoura university
Al Mansurah, Dakahlia Governorate, Egypt
RECRUITINGLinear Skeletal changes of the maxilla and mandible using cephalometric measurements
linear (mm) measurement
Time frame: From date of randomization until the date of first documented acceptable correction assessed up to 6 months
Angular skeletal changes of the maxilla and mandible using cephalometric measurements
angular (°) measurement
Time frame: From date of randomization until the date of first documented acceptable correction assessed up to 6 months
Linear dental changes of the maxilla and mandible using cephalometric measurements
linear (mm) measurement
Time frame: From date of randomization until the date of first documented acceptable correction assessed up to 6 months
Angular dental changes of the maxilla and mandible using cephalometric measurements
angular (°) measurement
Time frame: From date of randomization until the date of first documented acceptable correction assessed up to 6 months
Linear soft tissue changes of the maxilla and mandible using cephalometric measurements
linear (mm) measurement
Time frame: From date of randomization until the date of first documented acceptable correction assessed up to 6 months
Angular soft tissue changes of the maxilla and mandible using cephalometric measurements
angular (°) measurement
Time frame: From date of randomization until the date of first documented acceptable correction assessed up to 6 months
Oral health quality of life questionnaire
The questionnaire (COHIP-SF-AR) will be given to the participants once informed consent is obtained at 5-time points: before treatment, 1 week, 1 month, 3 months, and 6 months after wearing functional appliances.
Time frame: From date of randomization until the date of first documented acceptable correction assessed up to 6 months
Incidence of breakages and harms reported during routine or emergency visits in both groups
Details of complications in both groups, including breakages and harms reported during routine or emergency visits, will be registered and categorized according to their nature and severity using a previously published classification system
Time frame: From date of randomization until the date of first documented acceptable correction assessed up to 6 months
Arch perimeter and depth measurement from digital model analysis
linear (mm) measurement
Time frame: From date of randomization until the date of first documented acceptable correction assessed up to 6 months
Maxillary inter-canine width from digital model analysis
linear (mm) measurement
Time frame: From date of randomization until the date of first documented acceptable correction assessed up to 6 months
Maxillary inter-first molar width from digital model analysis
linear (mm)measurement
Time frame: From date of randomization until the date of first documented acceptable correction assessed up to 6 months
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