Participants and randomization
MARF, Blindness
MAY, BLINDNESS
The present study was performed in the periodontics department of the Dentistry School of Hamadan University of Medical Sciences from May to September 2021; 10 people who had less than 2 mm of attached gingiva and needed soft tissue augmentation on both sides were selected.The sample size was determined based on the assumption that the test group (MARF + PRF) and the control group (MARF) were equal. Mean and standard deviation indices were extracted from a similar study by Temmerman et al. (Each lower jaw was divided into two segments. Each side was randomized as control or test groups in a split‐mouth design, via a randomization table by a computer‐generated randomization list (STATA version 11). The treatment codes (test/control) were available in closed envelopes, which were sealed and opened just before the surgery by the surgeon. Blindness was not possible due to the nature of the procedure, and both the patient and the surgeon were informed about the treatment modality.