Supporting Information files.

ObjectiveTo explore how age and gender shape the relationship between personality traits, quality of life (QoL), and a patient’s decision to undergo surgery for correction of dentofacial deformity.MethodsIn a cross-sectional study, 108 individuals aged 14–53 years (median age 18 years; interquartile range 17–26) with a moderate to very great need for surgery according to the Index of Orthognathic Functional Treatment Need were assessed. There were 43% adolescents (≤17 years) and 68% females. Participants completed validated questionnaires measuring personality characteristics (Big Five Inventory, Multidimensional Perfectionism Scale, and Self-Esteem Scale), along with the Orthognathic Quality of Life Questionnaire. The decision to accept or refuse surgery was recorded.ResultsOverall, 51% of patients accepted surgery (48% of females and 57% of males). Adults were more likely to accept surgery than adolescents (61% vs. 37%; p = 0.019, V = 0.241; odds ratio 2.7; 95% confidence interval 1.2–5.9). In adults, lower self-esteem (SE) (p = 0.034, r = 0.270) and higher perfectionism (p = 0.012; r = 0.320), particularly concern over mistakes (CM) (p ConclusionsThe relationship between personality traits, QoL, and the decision to undergo orthognathic surgery was more strongly influenced by age than by gender. OF and FE influenced acceptance across all age and gender groups, while personality-related factors were particularly relevant among adults.