American Board of Orthodontics (ABO) Practice Exam

The selection of 70% as the percentage of asymptomatic patients exhibiting superior disk displacement is supported by studies that have investigated the prevalence of this condition in individuals who do not show typical symptoms associated with temporomandibular joint disorders (TMD). Superior disk displacement refers to the abnormal positioning of the articular disc within the joint, which can occur without any noticeable symptoms.

Research has indicated that a noteworthy proportion of asymptomatic patients may still present with this displacement, emphasizing that the presence of such anatomical changes does not always correlate with clinical symptoms. This finding underscores the importance of careful diagnostics in orthodontics and TMD evaluation, as many patients might require intervention despite their lack of symptoms. Understanding this percentage can help clinicians in screening and monitoring potentially asymptomatic cases that may develop symptoms later.

The other choices represent lower or higher percentages that do not align with the findings from relevant clinical studies, painting an inaccurate picture of the prevalence of superior disk displacement in asymptomatic patients.