Periodontal Initial Treatment Combined With Glucocorticoid Therapy for Erosive Oral Lichen Planus

Inclusion Criteria: * Existence of erosive oral lichen planus that lasts for more than 2 months * Erosive lesions are located in the buccal mucosa and gingival buccal sulcus of the bilateral mandibular posterior teeth area * The erosive lesions are mild to moderate (single or multiple small area erosions; 3mm ≤ longest diameter ≤ 10mm; 9mm2 ≤ total area of erosions ≤ 100mm2), and the degree of erosion on both sides is similar (the difference in the size of erosion on both sides does not exceed ± 25%) * The plaque index in the area of erosive lesions is ≥ 3; Dental calculus index ≥ 2; Gingival index ≥ 2; * Accompanied by stage II-IV extensive periodontitis Exclusion Criteria: * Pregnant women, lactating women, or women planning to conceive during the trial period * Patients with coagulation dysfunction or other uncontrolled systemic diseases who cannot undergo periodontal treatment * Has undergone basic periodontal treatment within the past 6 months * Individuals with a history of allergy to local anesthetic drugs such as articaine * Individuals with contraindications to glucocorticoids * Patients with lesion area erosion caused by trauma or chemical stimulation * Patients with mental disorders who are difficult to cooperate with treatment