The Objectives of the present study were undertaken to prepared hydroxyapatite powder from eggshell and seashell and convert them in Nano size. Hydroxyapatite (HA) is a biomaterial with osteoconductive properties and is prepared by the precipitation method. The properties of HA can be enhanced when the material is synthesized in the Nanoscale range to use in the mandibular bone of the rabbit to examine the influence of (HA) on bone healing.The eggshell and seashell were cleaned, and the phosphoric acid was added. The product inserts in the oven then calcined at 700˚C for 1 hour in the muffled furnace to evaporate CO 2 and to get the white crystalline powder, which indicated the presence of HA, this powder was converting to nanoparticle by attraction method. The product was applied in the groove of the rabbit's mandibular bone after surgical procedures to show the bone healing in histological examination. The results of IR Spectroscopy for the eggshell and seashell hydroxyapatite powder showed that the two compounds showed the same IR spectrum and the location of bands is approximately the same in the two compounds compared with the commercial hydroxyapatite powder by using FT-IR spectroscopy after dried at 100˚C. Histologically show that eggshell and seashell hydroxyapatite powder accelerated the bone healing in the mandibular bone of the rabbits. It can be concluded that, hydroxyapatite nanoparticles can successfully be produced by chemical precipitation techniques from eggshells and seashells with a phosphoric acid solution. Eggshell and seashell hydroxyapatite powder was used successfully in bone healing ‫ـــــــــــــــــــــــــــــــــــــــــ‬

This study aims to evaluate the healing effect of topical Apigenin cream 2% in the skin of rabbits. Twenty Four healthy Newzealand adult male rabbits approximately at the same age were involved in this study. All animals were anesthetized using a mixture of 40 mg/kg ketamine injection and xylazine 4 mg/kg intramuscularly. The skin of the dorsum area of each rabbit was shaved; then, three incisions (1cm in length) were made. Wounds were left without suturing to heal by secondary intention healing, and each animal had three wounds (wounds divided into three groups according to the type of treatment): one treated with Apigenin cream twice a day, the other with cold cream twice a day, and the third wound was left untreated. The application of cream was repeated daily; the wound size and the ratio of wound contraction were assessed at the first, fourth, and seventh days of study. The results revealed that the group treated with apigenin showed significantly better wound healing capacity in the skin of rabbits; wound size and wound contraction ratio was superior in the Apigenin group compared to control positive and negative groups. It can be concluded that apigenin cream has beneficial value for improving the wound healing potential of skin in rabbits.

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Our study aimed to investigate the systemic and topical effect of xylitol on the bone Alkaline Phosphatase and the bone mineral density in rabbits at the healing site in femur bone postoperatively. Twenty-four healthy white male, New Zealand rabbits, will be taken from the same species; the same age, Weight, and circumstance were chosen in this study. The Weight ranges from (1.3-1.8) Kg and aged (6-8) months were used in this study ). All animals were submitted to operation in the femur bone region. The groove of 2mm diameter was drilled in the femur bone by using the heavy-duty dental engine. After the operation, the rabbits were randomly divided into three groups (8 rabbits/group); each group was subdivided into 2 experimental periods (14,28 days) four rabbits for each period as follows: Control group, n=8 (the hole was not filled by anything), locally treated group n=8 (xylitol powder was applied and condensed well in the hole) and systemically treated group n=8 (the hole was not filled by anything but the rabbits received orally of 1mg/kg of xylitol. Bone alkaline phosphates and radiological analysis were measured after 14 and 28 days, respectively. Statistical analysis showed significant differences between all groups (control and treated). Biochemical analysis for bone alkaline phosphatase showed a significant increase in bone Alkaline Phosphatase in the systemically treated group compared with the control one. The estimated bone healing by measuring the diameter of bone defect showed a highly significant difference in diameter in the bone defect at day 14 between the control group (36.0±0.05) in comparison with the treated local group and systemic treated group (39± 0.78) and (25± 0.90) respectively. Also, we found a significant difference between the local treated group (39± 0.78) and systemic treated group (25± 0.90) in diameter. Still, on day 28, there was no significant difference between the control group (28.0±0.55) and the local treated group in diameter in the bone defects. There were significant differences between the control and the local treated groups compared with the systemic treated group (24.0 ± 0.23) at p ≤0.05. This study concluded that xylitol was accelerating bone healing when used topically and systemically, and this was indicated by increasing the bone alkaline phosphates and bone mineral density in densitometric analysis.

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