Adolescent 1 Cross-Over Studies 1 Facial Pain 1 Female Humans 1 Long-term follow-up 1 Longitudinal Studies 1 Male 1 Occlusal Splints 1 Pain Measurement 1 Relaxation Therapy 1 Self Concept 1 Surveys and Questionnaires Temporomandibular Joint Disorders 1 Treatment Outcome 1 adolescence 1 adolescent 1 controlled study 1 crossover procedure 1 face pain 1 female 1 human 1 longitudinal study 1 male 1 occlusal appliance 1 occlusal splint 1 pain measurement 1 procedures 1 questionnaire 1 randomized controlled trial 1