Clinical efficacy of invisible mandibular advancement appliances in treating adolescent skeletal class II malocclusion and their impact on temporomandibular joint morphology.

OBJECTIVE

This study aims to analyze the clinical efficacy of invisible mandibular advancement appliances in treating adolescent skeletal Class II malocclusion and their impact on temporomandibular joint (TMJ) morphology.

METHODS

Seventy-two adolescent patients with skeletal Class II malocclusion were divided into a control group treated with straight wire appliances and a study group treated with invisible mandibular advancement appliances. Changes in TMJ-related angles, facial height parameters, such as SNA, SNB, ANB, MP-FH, N-Me, N-ANS, ANS-Me, joint space measurements, condylar dimensions, lip parameters, including ULP, ULEP, LLEP, Z-angle, upper airway parameters, including Ba-PNS, Ad1-PNS, Ad2-PNS, Mc1Mc2, SPP-SPPW, UMPW, PAS, VLPW, and clinical efficacy were compared between the two groups before and after treatment.

RESULTS

After treatment, the study group exhibited significantly higher values in ANB, MP-FH, ANS-Me, joint spaces, condylar mediolateral width, and Z-angle, while showing lower values in N-Me, N-ANS, condylar height, condylar anteroposterior diameter, ULP, ULEP, and LLEP compared to the control group. For upper airway parameters, the study group had higher values in Ad1-PNS, Ad2-PNS, Mc1Mc2, and SPP-SPPW. The study group also demonstrated superior clinical efficacy, achieving a total effective rate of 94.44%.

CONCLUSION

The invisible mandibular advancement appliance demonstrates significant clinical efficacy in treating adolescent skeletal Class II malocclusion, effectively improving TMJ morphology while simultaneously optimizing facial profile and airway function.