The occlusal splint as a tried and tested treatment method for temporomandibular dysfunction (TMD) can pose a challenge to dentists in clinical practice in the case of certain positional anomalies of the jaw and teeth, especially with regard to the correct functional design. This article describes a case-based reasoning approach, which, via simple adjustments made to the occlusal splint in a patient with Angle Class II Division 2 malocclusion, resulted in the rapid success of treatment. In this article, possible factors for the occurrence and successful treatment of TMD with joint sounds are briefly discussed in the context of this dysgnathia case. Keywords: occlusal splint, Angle Class II Division 2 malocclusion, malocclusion, joint sounds, case-based reasoning