Effects Of Tb Appliance On Tmj And Cs For Adolescents

This article reports a two-phase treatment case for skeletal Class II mandibular retrognathism adolescent patient using a Twin-Block appliance followed with fixed appliance treatment. The results demonstrates that the Twin-Block appliance can effectively promote mandibular growth in adolescent patients while improving facial profile and inducing adaptive remodeling of the temporomandibular joint. Additionally, it enhances respiratory function and contributes to the improvement of cervical posture. The patient was initially examined at 10y5m, with a chief complaint of protruding upper teeth and a retruded chin. Cephalometric analysis indicated sagittal skeletal discrepancy with mandibular retrognathism, proclined upper incisors, and upright lower incisors. A two-phase treatment plan was formulated: Phase I: A Twin-Block appliance with maxillary expansion was performed. Phase II: Fixed appliances were employed. After the two-phase treatment, significant improvements were achieved: effective retraction of the upper incisors, correction of the overjet, and enhanced nasolabial-mental curve. Post-treatment imaging demonstrated increased condylar length, width, and height, along with glenoid fossa remodeling and anterior condylar displacement. Additionally, cervical spine alignment and head-neck posture improved, with correction of the preoperative cervical postural deviation Maxillary expansion with the Twin-Block appliance corrects transverse maxillomandibular discrepancy and facilitates mandibular growth development. Thus guides the mandible forward, thereby increasing the upper airway volume and improving respiratory function. Concurrently, it enhances cervical posture alignment by reducing head-neck postural deviation. The Twin-Block appliance demonstrates significant therapeutic efficacy in adolescent patients with skeletal Class II malocclusion characterized by mandibular retrognathism.