Class III Malocclusion, Hyoid Bone
Conditions
Keywords
Class III Malocclusion, Craniocervical Posture, Hyoid Bone Position, Pharyngeal Airway
Brief summary
The aim of this study was to evaluate the changes in head posture, position of the hyoid bone, pharyngeal airway and cervical posture after the use of Petit type face mask in patients with skeletal class III malocclusion (ANB angle \< 0) with ongoing growth. No other study was found in the literature in which head posture, cervical posture, and hyoid bone position were evaluated after the use of a face mask and compared with a control group consisting of patients of the same age group and the same malocclusion.
Detailed description
All radiographic assessments, including cephalometric, pharyngeal airway and craniocervical measurements were performed by the same researcher and she was blind to all the treatment details, orthodontic records, and information of the subjects to prevent bias. Lateral cephalometric radiographs were taken digitally with an X-ray unit (OP300; Instrumentarium Dental, Tuusula, Finland) according to the manufacturer and same technician. Subjects were positioned at the natural head position, teeth in centric occlusion, and lightly closed lips for lateral cephalometric radiographs. Skeletal development of individuals was evaluated using cervical vertebra maturation method (Ref: Bacetti T., An Improved Version of the Cervical Vertebral Maturation (CVM) Method for the Assessment of Mandibular Growth. Angle Orthod.). The skeletal development of individuals was evaluated using the cervical vertebra maturation method and it was determined that all patients were in the prepubertal stage (CS1-CS3). (Ref: Cevidanes L., Comparison of two protocols for maxillary protraction: bone anchors versus face mask with rapid maxillary expansion. Angle Orthod.)
Interventions
DEVICESkeletal Class III Malocclusion Treatment with Face Mask Group
Expanding the maxilla, which is narrower than the mandible in the transverse dimension, using a rapid maxillary expansion device and protraction of the maxilla, which is located behind in the sagittal dimension, forward using the face-mask appliance.
Sponsors
Taner OZTURK, DDS, MS
Study design
Allocation
NON_RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Intervention model description
Head posture on lateral cephalometric radiographs taken before and after the application of the rapid maxillary expansion device with hooks to the upper dental arch and the Petit type face mask treatment applied after the skeletal class III patients due to maxillary retrognathia, whose growth development continues, for treatment to the Orthodontics Department of the Faculty of Dentistry, cervical posture, pharyngeal airway, and hyoid bone positions are determined.
Eligibility
Sex/Gender
ALL
Age
8 Years to 10 Years
Healthy volunteers
No
Inclusion criteria
* For the study group it is as follows: 1. Patients with skeletal Class III association (ANB \< 0°) 2. Maxillary insufficiency patients 3. Patients with ongoing growth development 4. Patients who have used a 'Petit type face mask' for anterior positioning of the maxilla * For the control group it is as follows: 1. Patients with skeletal Class III association (ANB \< 0°) 2. Maxillary insufficiency patients 3. Patients with ongoing growth development 4. Patients who have not had any orthodontic treatment
Exclusion criteria
1. Patients with a congenital anomaly or a craniofacial deformity 2. Patients who have undergone orthodontic treatment 3. Patients with tooth extraction or tooth loss 4. Patients with a history of trauma 5. Patients who have completed growth development (patients with Ru on wrist film)
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Craniocervical posture change | Before treatment (T0) and after treatment (up to about 10-12 month; T1) for the study group. First measurement (T0) for the control group and after similar follow-up time (up to about 10-12 month; T1) as for the treatment group. | Investigation of the change in head posture after treatment of class III malocclusion due to maxillary deficiency with a face mask using craniocervical angles (NSL/CVT, NSL/OPT, CVT/HOR, OPT/HOR, NL/VER, NSL/VER). |
| Pharyngeal airway change | Before treatment (T0) and after treatment (up to about 10-12 month; T1) for the study group. First measurement (T0) for the control group and after similar follow-up time (up to about 10-12 month; T1) as for the treatment group. | Investigation of the change in pharyngeal airway dimensions after treatment of class III malocclusion due to maxillary deficiency with a face mask using pharyngeal airway sagittal dimension measurements (PNS-UPW, Cv2-MPW, Cv3-LPW, HRL/U-PNS, U-PNS, PASmin). |
| Hyoid bone position change | Before treatment (T0) and after treatment (up to about 10-12 month; T1) for the study group. First measurement (T0) for the control group and after similar follow-up time (up to about 10-12 month; T1) as for the treatment group. | Investigation of the change in hyoid bone position after treatment of class III malocclusion due to maxillary deficiency with a face mask using hyoid bone location measurements (H-Cv2, H-Cv3, H-Mandibular line, H-Me). |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Correlation of craniocervical posture, pharyngeal airway and hyoid bone change | Before treatment (T0) and after treatment (up to about 10-12 month; T1) for the study group. First measurement (T0) for the control group and after similar follow-up time (up to about 10-12 month; T1) as for the treatment group. | Investigation of the relationship between changes in craniocervical posture, pharyngeal airway dimensions and hyoid bone position. |
Countries
Turkey (Türkiye)
Outcome results
None listed