In a pediatric population before orthodontic treatment, to determine if there were: 1. significant differences in A. predicted TMJ loads (% applied bite force (BF)) and B. estimated TMJ compressive stresses (σ, MPa) during unilateral biting on molars with the mandible in retruded position compared to on molars and incisors with the mandible protruded to class I occlusion; and 2) correlations of A. predicted TMJ loads and B. estimated TMJ compressive stresses with dependent variables of sex, age, mandibular plane angle, ramal length, and/or mandibular length.