PubMed · 14835621
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J EFSKIND. 1951-06-01. [Connective tissue sarcoma].. https://pubmed.ncbi.nlm.nih.gov/14835621/
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Periodontal plastic surgical techniques have evolved to meet the demands of today's dental patient. Free gingival grafts (FGGs), pedicle flaps, subepithelial connective tissue grafts (SCTGs), acellular dermal matrix (ADM) grafts, and guided tissue regeneration (GTR) have all been used to cover denuded root surfaces. FGGs have demonstrated inconsistent results. Pedicle flaps have provided consistent results, but adequate tissue must be present initially. ADM grafts have also demonstrated success, but long-term stability may be a problem. Presently, SCTGs and GTR should be considered the treatment of choice for root coverage. They are the most predictable with average root coverage as high as 98.9% and 92.3%, respectively.
The term internal neurolysis means removal of fibrotic tissue inside a nerve trunk. Unfortunately the term was used for procedures with complete isolation of fascicles with all consequences like damage of links between the fascicle and impairment of blood supply. The conclusion based on some negative experiences that all surgery within a nerve trunk has to be avoided cannot be accepted. Neurolysis within a nerve trunk, id est within the epineurium, is a step-wise procedure to decompress fascicles from a constricting fibrosis. It stops immediately if this aim is achieved or continues with resection and reconstruction if an irreparable damage is present. It is better to use terms that describe exactly what was done and abandon the ill-defined term "internal neurolysis". Fibrosis of the paraneurium remains outside the epineurium but causes the same consequences as fibrosis of the epineurium.
Young's modulus and Poisson's ratio of a tissue can be simultaneously obtained using two indentation tests with two different sized indentors in two indentations. Owing to the assumption of infinitesimal deformation of the indentation, the finite deformation effect of indentation on the calculated material parameters was not fully understood in the double indentation approach. However, indentation tests with infinitesimal deformation are not practical for the measurement of real tissues. Accordingly, finite element models were developed to simulate the indentation with different indentor diameters and different deformation ratios to investigate the finite deformation effect of indentation. The results indicated that Young's modulus E increased with the increase in the indentation deformation w, if the finite deformation effect of indentation was not considered. This phenomenon became obvious when Poisson's ratio v approached 0.5 and/or the ratio of indentor radius and tissue thickness a/h increased. The calculated Young's modulus could be different by 23% at 10% deformation in comparison with its real value. The results also demonstrated that the finite deformation effect to indentation on the calculation of Poisson's ratio v was much smaller. After the finite deformation effect of indentation was considered, the error of the calculated Young's modulus could be controlled within 5% (a/h = 1) and 2% (a/h = 2) for deformation up to 10%.