[Comparison of the effects of modified muscle agonists and Twin-block orthodontic appliances in the treatment of skeletal ClassⅡmandibular retraction deformity].

PURPOSE: To compare the effects of modified muscle agonist and Twin-block orthodontic appliance in the treatment of skeletal ClassⅡmandibular retraction deformity.

METHODS

A total of 108 patients with skeletal ClassⅡ mandibular retraction deformity admitted to 904th Hospital, Joint Logistics Support Force, Chinese People's Liberation Army from March 2021 to June 2024 were selected and divided into 2 groups according to the random number table method, with 54 cases in each group. The control group was treated with Twin-block orthodontic appliance, while the experimental group was treated with modified muscle activator. The treatment effects were compared between the two groups.

RESULTS

The corrective effect of the experimental group was significantly better than that of the control group (P＜0.05). After treatment, the hard and soft tissue indicators and upper airway indicators in the experimental group were significantly better than those in the control group (P＜0.05). The smile index and parabuccal space ratio of the experimental group were significantly lower than those of the control group, and the symmetry of the smile was significantly higher than that of the control group (P＜0.05). The incidence of complications and the recurrence rate one year after treatment in the experimental group were significantly lower than those in the control group (P＜0.05).

CONCLUSIONS

Compared with Twin-block orthodontic appliance, modified muscle agonist has significant effect in correcting patients with skeletal ClassⅡmandibular retraction deformity. It can improve the smiling aesthetic index of patients, alleviates upper airway stenosis, and has a lower incidence of complications.