الفهرس 
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Abstract
Root coverage procedures have gained much popularity in recent years. Coronally advanced flap (CAF) is a predictable technique for treating gingival recessions. Platelet-rich fibrin (PRF), an autologous platelet concentrate, enhances soft-tissue wound healing. Acellular dermal matrix allograft (ADMA) is a donated human dermis that was processed to remove all cells and retain the regenerative collagen matrix.
The present study was undertaken clinically evaluate and compare the effectiveness of the use of platelet rich fibrin membrane versus acellular dermal matrix allograft in combination of coronally positioned flap (CPF) in treatment of Miller Class I and II marginal tissue recession.
This was a randomized controlled clinical study that included twenty patients with Miller Class I and II marginal tissue recession; who were randomly distributed to PRF membrane (group A) and ADMA (group B). The clinical parameters included: probing depth (PD), gingival recession height (GRH), clinical attachment level (CAL), width of keratinized tissue (KTW) and gingival recession width (GRW). They were assessed prior to operation, 3 months and 6 months following the operation.
Significant differences were seen from baseline to 6 months in PRF group regarding reduction in PD, GRH, CAL, GRW, and increase in KTW (P < 0.05). In ADMA group also, significant difference was noted at the end of 6 months regarding reduction in PD, GRH, CAL, GRW, and increase in KTW (P < 0.05). Intergroup analysis showed statistically significant differences between the 2 groups in GRH through all periods, in CAL at baseline, and in GRW at 6 months, while there were no significant differences in other parameters and through the other periods.
We concluded that both are effective materials in root coverage, but PRF membrane showed better and more stable results at the end of 6 months as compared to ADMA in treating gingival recession.