Predictable outcomes intended by the application of PRF (platelet-rich fibrin) derivative membranes have created a lack of consideration for their consistency and functional integrity. This study aimed to compare the mechanical properties through tensile strength and analyze the structural organization among the membranes produced by L-PRF (leukocyte platelet-rich fibrin), A-PRF (advanced platelet-rich fibrin), and A-PRF+ (advanced platelet-rich fibrin plus) (original protocols) that varied in centrifugation speed and time. L-PRF (n = 12), A-PRF (n = 19), and A-PRF+ (n = 13) membranes were submitted to a traction test, evaluating the maximum and average traction. For maximum traction, 0.0020, 0.0022, and 0.0010 N·mm−2 were obtained for A-PRF, A-PRF+, and L-PRF, respectively; regarding the average resistance to traction, 0.0012, 0.0015, and 0.006 N·mm−2 were obtained, respectively (A-PRF+ > A-PRF > L-PRF). For all groups studied, significant results were found. In the surface morphology observations through SEM, the L-PRF matrix showed a highly compact surface with thick fibers present within interfibrous areas with the apparent destruction of red blood cells and leukocytes. The A-PRF protocol showed a dense matrix composed of thin and elongated fibers that seemed to follow a preferential and orientated direction in which the platelets were well-adhered. Porosity was also evident with a large diameter of the interfibrous spaces whereas A-PRF+ was the most porous platelet concentrate with the greatest fiber abundance and cell preservation. Thus, this study concluded that A-PRF+ produced membranes with significant and higher maximum traction results, indicating a better viscoelastic strength when stretched by two opposing forces.

The goal of this research was to carry out a systematic review to verify the possible influence of occlusal factors on the occurrence of gingival recession and noncarious cervical lesions. To answer the specific research question—whether gingival recession or noncarious cervical lesions on teeth are present under occlusal trauma—a bibliographic search was conducted at MEDLINE/PubMed, Web of Science, and Gray Literature databases focusing on articles published, following strict inclusion criteria based on randomized clinical trials, controlled clinical studies, and case series, with restricted language (English) and publication date between March 2010 and March 2020, considering patients with occlusal trauma and gingival recession/noncarious cervical injuries. Questionnaires, animal or laboratory studies, case reports, and interviews were excluded. First, the title and/or abstract of the articles obtained were analyzed and, finally, a full-text reading was performed. Given the amount and diversity of the final studies, a qualitative analysis was made. Based on the established criteria, it was possible to obtain an initial 757 articles. After screening, five articles were included, and then qualitative analysis was performed. The results described in the articles were different, given the heterogeneity of the articles subjected to analysis. A few studies were published in the past 10 years, suggesting that the traumatic occlusion seems to be associated with the occurrence of the noncarious cervical lesion while it is not possible to arrive at a conclusion with regard to the association of gingival recession and occlusal trauma. Key Message Even though many professionals have categorically affirmed that there is a relation between trauma occlusal and gingival recession/noncarious cervical lesion, this systematic review found the absence of strong literature to really prove it. Once defined, it allows the therapeutic focus to centre on the causal or contributing factors and preventing or reducing future recurrence.