California-licensed periodontist Cathleen A. Silliman, D.D.S. (license 036698) diagnoses and treats complex gum disease from her third-floor suite at 2322 Sixth Avenue in downtown San Diego's Bankers Hill. General dentists throughout the district refer advanced periodontal cases to this Sixth Avenue office, a specialist-referral pattern also used by practices like Bankers Hill Dental for patients needing tissue grafting or implant placement. The practice accepts both English- and Spanish-speaking patients and carries credentials with UnitedHealthcare and other major dental carriers. Post-surgical prescriptions for antimicrobial rinses and specialized healing compounds route to providers such as University Compounding Pharmacy, which formulates custom medications on the Bankers Hill campus. Highest-complexity procedures include guided bone regeneration using resorbable collagen membranes and titanium-reinforced PTFE barriers to rebuild alveolar ridge volume for delayed implant placement.