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The International Journal of Oral & Maxillofacial Implants



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Int J Oral Maxillofac Implants 11 (1996), No. 2     1. Mar. 1996
Int J Oral Maxillofac Implants 11 (1996), No. 2  (01.03.1996)

Page 210-215

Resistance to Bacterial Aggression Involving Exposed Nonresorbable Membranes in the Oral Cavity
Leghissa, Giulio Cesare / Botticelli, Annibale Renzo
Bacterial colonies split implanted membranes that are exposed to oral biologic fluids as a consequence of dehiscence. The clinical and histologic behavior of 14 implanted polyurethane membranes was observed during the period of exposure to oral fluids for 2, 3, 4, and 6 weeks and without dehiscence (after 8 weeks). Statistical analysis indicated that the decrease in the number of neutrophils after 5 weeks, associated with the increase in the number of activated fibroblasts, cellular debris, giant cells, and aggression of bacteria, was statistically significant (from P < .05 and P < .01 for activated fibroblasts to P <.005 and P < .001 for neutrophilic cells). The increase in bacterial passage through the polyurethane membranes and in the number of giant cells and cellular debris after 8 weeks represents late dissolution of the membranes; the progressive increase of activated fibroblasts is significant because the longer the membrane resists, the better the cells can grow and give way to the process of tissue regeneration.

Keywords: nonresorbable membranes, oral microbiology, oral pathology