This study evaluated and compared four different barrier membrane materials used to treat class II mandibular premolar and molar furcations in seven dogs with naturally occurring periodontitis. Five class II furcation defects in each animal were randomly assigned to one of four experimental groups or to a control group. Each defect was treated by surgical debridement, root planing, and barrier membrane coverage with one of the four test materials or no barrier membrane (control). Thus, each animal served as its own control. Following 6 months of healing, block sections were used to histologically measure the amount of regenerated tissue and stereometrically enumerate the inflammatory cell infiltration observed with each of the treatment modalities. The four barrier membrane materials (polycarbonate filter, silicone rubber, expanded polytetrafluoroethylene, and polycaprolactone) all provided a wound healing environment that promoted new cementum formation, with mean values ranging from 1.96 +/- 0.031 mm to 2.18 +/- 0.015 mm, and facilitated alveolar bone regeneration, with mean values ranging from 1.18 +/- 0.019 mm to 1.44 +/- 0.014 mm. Control-treated sites showed mean values of only 0.24 +/- 0.007 mm new cementum formation and 0.32 +/- 0.017 mm bone fill. Polycarbonate filter and polycaprolactone membrane barriers elicited a significantly greater chronic inflammatory cell response of lymphocyte and plasma cell infiltrates as compared to expanded polytetrafluoroethylene and silicone rubber, which were comparable to control-treated sites.

The concept regeneration technique with PRP and with the stimulating influence of platele activated growth factors results in the regeneration of deep periodontal tissue as an important prerequisite for the successfull treatment of gingival recession.

This paper provides some new information about old leading technologies and possibilities of large-format brick production in today's conditions. The production of masonry elements can be from clay that has been shaped and dried, or after drying, such clay has also been baked. The most sensitive phase in the production of clay products is the drying of the clay. In the drying phase, such stress states can occur in the clay that would lead to the appearance of cracks and warping. It is for these reasons that today the clay brick format has been reduced to the dimensions of 25 x 12 x 6.5 cm. The formats of bricks and baked bricks that were made thousands of years ago, until several hundred years ago, were several times larger than today's format, completely correct and without cracks and twisting. The old builders used micro-reinforcement in the form of fibers, which they mixed into the clay and thus prevented the appearance of cracks and warping. These technologies have been tested and confirmed in the works of students on the subjects of Traditional Materials and Masonry Structures for several years at the Faculty of Civil Engineering in Subotica. These projects were done in collaboration with the world leader in the production of baked clay products, Wienerberger d.o.o. Kanjiža.

No abstract