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Biocompatibilidade e influência no reparo ósseo de resinas extraídas de plantas da floresta amozônica

  • Lopes, Daniel Kfouri
Publication Date
Oct 25, 2012
Repositório Institucional da UFSC
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The need for new alternative materials in clinical dentistry, encourages further researches of natural products. It´s well known that Brazilian Amazon biodiversity has enormous potential plant sources for obtaining therapeutic substances. Experimental studies in rats are commonly used for the initial tests of new substances biocompatibility. The present study demonstrates experimental models in rats of biocompatibility subcutaneous test, and the possible use in bone graft therapies of three plant extracts from tropical rainforest trees, and the Adhesive Mixture made by the extracts: the Breu Branco (Protium heptaphyllum march) resin (RBB), the Jatobá (Hymenaea courbaril L) resin (RJ), the Amapá-doce (Brosimum Ducke Parinarioides) extract (LA); and the Adhesive Mixture (MA). The subcutaneous test evaluated the biocompatibility through analysis of inflammatory infiltrate characteristics, caused by each substance, in light microscopy, on 3, 7 and 15 days. The best results were presented by (RBB), showing discrete inflammatory reaction by it´s implantation, followed by (MA), (RJ) and (LA), respectively. The Amapá extract had less biocompatible scores compared to the other substances, showing intense acute inflammation in all experimental times. The bone graft test evaluated extracts and Adhesive Mixture bone healing action by light microscopy. The associations extracts- autograft were used filling 5 mm defects in rat calvaria, at 7 and 21 days. The histomorphometry revealed that, in combination with autograft, the Breu Branco extract (A+BB) (851,7 µm) was also able to produce satisfactory results in bone graft therapy, reaching comparable outcomes to autograft group (A) (694,4 µm) at the end of 21 days. The Adhesive Mixture autograft association (A+MA) (313,8 µm), has produced impressive initial results (7 days) to nearly 2 times the group (A) (174,8 µm) average bone thickness, getting similar outcome to group (A+BB) in 21 days. The Jatobá resin - autograft association (A+J) (467,1 µm) has showed lower bone thickness in comparison to group (A), but higher levels compared to control group (C) (226,8 µm), where the blood clot was used for bone defect filling. The group (A+LA) (487,9 µm), the Amapá extract - autograft association, also showed superior levels in comparison to group (C). It suggests that, despite the need for additional researches, the Adhesive Mixture, as the Breu Branco (Protium heptaphyllum march) resin, has potential use in dentistry.


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