face mask protraction therapy in early skeletal class iii malocclusion
Prospective randomized controlled trials (RCT).
The intervention trial studied the use of a custom mask with ribbon/welded self-tapping screw expansion appliance in two treatment groups of the study compared to the control group;
In one treatment group, the appliance is activated twice a day (0. 5u2009mm/day)
At least 7 days (
And in the other is passive (
Non-expansion contrast treatment group).
Both groups received full time elastic masks for 300-500g.
Patients in the control group were observed for at least 12 months and then randomly assigned to one of the two treatment groups.
Outcome Measurement is a clinical evaluation of the class I Moore relationship of over-correction close to the endto-
The end relationship with the positive supershoot of 4-5mm.
Head shadow measurement evaluation using traditional measurement methods to describe changes between pre-processing and post-processing
Treatment and control of lateral head Films;
The change of 55 landmarks was evaluated relative to the x-y coordinate system.
Quantitative treatment effects were analyzed using Johnston. 1Resultsu2003Forty-
6 children aged 5-10 were recruited in the study and randomly assigned to Group A (expansion; n=15), group B (nonexpansion; n=14)or group C (control; n=17).
There was no statistically significant difference between the clinical results of Group A and Group B and the head shadow measurement variables.
According to Johnston\'s analysis, the total amount of Class III corrections implemented is 4mm, 3.
Group A 69mm (expansion), and 4.
Group B 35mm (nonexpansion). Only one-
The third reason for bone change is to use double-
The third reason for this change is the rotation of the lower jaw.
The joint movement of the upper and lower jaw produces the ANB angle of 3. 87° and +3.
99 degrees, change 3. 89 and +3. 74u2009mm.
Conclusion face mask traction treatment provides an effective correction for early class III misfit.
The results of this study do not support the need to expand the bow without a transverse difference or a bone/tooth anti-tooth fit.
The result of correction is a combination of changes in bones and teeth with an overall improvement of the dental facial complex.
Upper traction is an emerging paradigm for early treatment of skeletal Class III mis-deformity.
More and more people recognize that dentures may be a major cause of Class III mis-fit, coupled with limited ability to influence Chin growth, forcing this new concept.
High traction efficiency-
Establishment and support of existing literature.
This study may be the first prospective randomized controlled trial of the subject.
One notable feature of it is the addition of a control group to quantify growth before recruiting participants from both treatment groups.
This addresses why a real controlled trial in a clinical orthodontic setting, I . e. , a randomized controlled trial, is the main problem of difficulty and in a clinical orthodontic setting, controls need to be rejected for treatment.
Clinical Orthodontics needs to address the impact of treatment methods on the bone base of growing teeth, and screen treatment effects from growth-induced treatment effects.
The addition of the control group opened up an evidence
Basic window for orthodontic clinical trials.
Science is based on assumptions, and in fact, it is based on speculation to advocate the use of jaw expansion even if there is no anti-tooth joint or horizontal difference.
This theory seems to put this cycle
The upper teeth will have a more obvious plastic effect.
The evidence and results of this clinical trial suggest that this is not the case.
Both the expansion Group and the non-expansion group showed significant bone changes (