Injectable Platelet-Rich Fibrin and Microneedling With or Without Vitamin C for Gingival Phenotype Augmentation.

This randomized split-mouth clinical trial will evaluate whether adding locally injected vitamin C to injectable platelet-rich fibrin (i-PRF) and microneedling improves gingival tissue thickness and keratinized tissue width in women with a thin gingival phenotype in the lower front teeth region. Each participant will receive i-PRF and microneedling on both sides of the lower anterior region. One side will additionally receive vitamin C, while the opposite side will receive normal saline as a placebo. The treatment will be repeated after 4 weeks. Gingival measurements will be taken at baseline, 3 months, and 6 months after the second treatment session. Patient satisfaction will also be assessed during follow-up.