Final answer:
An intraoral soft tissue examination aids in diagnosing conditions with visible changes in the mouth's soft tissues, like lichen planus and erythema multiforme, as well as detecting signs of deficiency diseases. However, it does not assist in diagnosing sinusitis, which affects the sinuses and often requires imaging for diagnosis.
Step-by-step explanation:
An intraoral soft tissue examination will assist in the diagnosis of conditions that present with visible or palpable changes in the soft tissues of the mouth. For example, lichen planus and erythema multiforme are both conditions that have recognizable lesions within the oral cavity that can be observed during an examination. Additionally, deficiency diseases may present with characteristic lesions of the lips, fissures at the angles of the mouth, also known as cheilosis, dermatitis of the face, a magenta tongue, and certain functional and organic disorders of the eye. These can also be identified through intraoral examination. However, sinusitis would not be diagnosed through an intraoral soft tissue exam, as it primarily affects the sinuses and may require imaging or other methods to diagnose effectively.