Efficacy Of Twin-Block Functional Appliance In Managing Acute Addwor

To evaluate the efficacy of the Twin-Block functional appliance in maintaining a harmonious disc-condyle relationship using magnetic resonance imaging (MRI) and analyze influencing factors. A total of 48 patients diagnosed with unilateral acute anterior disc displacement without reduction (ADDWoR) by MRI between June 2024 and December 2025 were enrolled. The cohort comprised 87.5% females, aged 12–47 years. Following arthrocentesis and mandibular manipulation, a Twin-Block functional appliance was fabricated immediately. Maximum mouth opening (MMO) and visual analog scale (VAS) pain scores were recorded at baseline,2weeks,1month, and 3 months of treatment. Post-treatment MRI was performed to assess imaging outcomes. Patients were divided into stable and recurrent groups based on disc-condyle relationship maintenance. Statistical analysis compared baseline MMO, disc morphology, joint effusion, lateral displacement, disc-condyle angle, duration of limited mouth opening, and muscular pain between groups. After 3 months of treatment, MMO increased from 29.43 mm to 45.55 mm, and VAS decreased from 4.35 to 0.51. The maintenance rate of a harmonious disc-condyle relationship was 81.25%. Univariate analysis revealed significant differences between the stable and recurrent groups in disc-condyle angle, duration of limited mouth opening, lateral displacement, and muscular pain The Twin-Block functional appliance effectively maintains a harmonious disc-condyle relationship. Large disc-condyle angles, prolonged duration of limited mouth opening, lateral displacement, and concomitant muscular pain are risk factors for recurrent disc displacement.