Which condition does not show alveolar bone resorption?

Steven-Johnson syndrome is primarily a severe reaction to medications or infections that leads to widespread skin and mucosal ulcerations. This syndrome does not typically involve the alveolar bone directly, and therefore, it does not show alveolar bone resorption. The primary focus of Steven-Johnson syndrome is on the soft tissues and mucosal surfaces, leading to complications like erosions and scars on the skin and mucous membranes, rather than changes to the underlying bone structure.

In contrast, conditions like pemphigus vulgaris, diabetes mellitus, and Crohn's disease can be associated with inflammatory processes or alterations in the body that may lead to alveolar bone resorption. For instance, pemphigus vulgaris can affect the oral mucosa and lead to bone loss through chronic inflammation. Diabetes mellitus is also linked to periodontal disease, which may contribute to bone resorption in the jaw. Crohn's disease may cause granulomatous inflammation in the gastrointestinal tract, and in cases involving the oral cavity, it can impact the supporting bone structures of the teeth.