Impact of comprehensive orthodontic treatment on adolescents using Health-Related Quality of Life (HRQoL)

 # Improvement in which domain is typically the most significant and consistent finding in longitudinal studies assessing the impact of comprehensive orthodontic treatment on adolescents using Health-Related Quality of Life (HRQoL) instruments?

A. Temporomandibular Joint (TMJ) Symptom Reduction

B. Periodontal Health and Plaque Index Scores

C. Masticatory Function and Dietary Habits

D. Psycho-social Well-being and Self-esteem

The correct answer is: D. Psycho-social Well-being and Self-esteem

Longitudinal studies and meta-analyses of orthodontic treatment in adolescents consistently report the most significant and robust improvements in psycho-social domains of HRQoL, including emotional well-being and social well-being, with standardized mean differences of -0.61 (95% CI: -0.80 to -0.41) and -0.62 (95% CI: -0.82 to -0.43), respectively—outperforming functional or physical domains. These gains stem from enhanced aesthetics, reduced self-consciousness, and improved social interactions, as measured by tools like the Child Perceptions Questionnaire (CPQ). In contrast, TMJ symptoms (A) show variable or minimal changes unrelated to alignment alone; periodontal health (B) often worsens initially due to appliances; and masticatory function (C) improves modestly but inconsistently, primarily in severe cases.