The goal of this clinical trial is to compare, the effect of letting the xenogeneic bone graft exposed to the oral environment or seal off the graft with a collagen matrix. Them main questions it aims to answer are: * The enhancement of soft tissue healing during the initial phases following immediate implant placement. * The secondary aim is to evaluate the dimensional alterations in hard tissues at immediately placed implants and different biomaterial protocol. It were selected patients with indication of flapless extraction in posterior teeth, which was placed immediate implant (n=28) and gap filling with deproteinized bovine bone mineral (Geistlich Bio-Oss®). In this study, participants were stratified into two randomized blocks, each corresponding to a distinct surgical technique: left exposed the graft to the oral environment or coverage with a collagen matrix (Geistlich Mucograft®). * Previously the extraction was performed the measurement of the keratinized gingiva, and after 04 months of implant placement. * The soft tissue healing was evaluated on days 02, 07, 30 days; by means of a blue-stained solution (methylene blue 0.05%) and standardized photograph. * In the same date from different healing times it was performed immunoenzymatic analysis of the levels of VEGF (vascular endothelial growth factor), IL-1β (interleukin-1β) and FGF2 (fibroblast growth factor 2). * It was also be performed cone beam computed tomography images quantifying the soft and hard tissues thickness of the facial and lingual bone wall. The clinical trial examiner was blinded during the study period.
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Keratinized Mucosa Width
Timeframe: before extraction, after 1-2 months post implant placement, and after the emergence contour of a prosthesis (up to 4 months).