The goal of this observational study is to compare the composition of the human gingiva in different gingival phenotypes. The main questions to answer are: * Is there any difference in the cellular composition of the gingiva between thin and thick gingival phenotype? * Is there any difference in the molecular composition of the gingiva between thin and thick gingival phenotype? The participants were divided in two groups (thin and thick phenotype) and a biopsy of healthy gingiva was obtained from each one them. The biopsies were analyzed histologically and the collected data will be analyzed statistically in order to identify possible differences between the gingival phenotypes.
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Cell density
Timeframe: Baseline