Effect of platelet rich plasma on osseointegration of endosseous implants in induced diabetic experimental models

The oral rehabilitation by dental implants in patients with diabetes remains a controversial issue. The aim of this study was to investigate the role of platelet rich plasma [PRP] in osseointegration of endossous implants in induced diabetic experimental models. A total of 16 New Zealand Albino male rabbits were used in this study. The animals were randomly divided into 2 groups with 8 animals each; Control group [CG] Group I, and insulin treated induced diabetic group [ITIDG] Group II. Where diabetes was induced by a single dose of Sterptozotocin. 32 implants were used in this study. In each group, each animal received two endossous implants inserted bilaterally in the tibiae shafts, one implant was inserted in the right tibia, while the other implant was inserted in the left tibia after application of PRP into the prepared surgical site. At the 4th and 12 th weeks the animals were subjected to Scintigraphy. Animals were sacrificed at the 12 th week following implants insertion and PRP application, specimens were examined under scanning electron microscope [SEM] where it was possible to observe the bone implant interface. In our results a statistically significant difference was observed in all groups regarding bone density around the implants which is represented as PV overtime. The osteoblastic activity was measured according to the degree of photon emission, the count of photons [ROI]. The mean percentage change of ROI count overtime was statistically significant in all groups. Under SEM it was possible to observe the bone implant interface after 12 weeks, SEM results revealed intimate contact between bone and implants surface in case of group Ib, although bone formation differs at several regions of the implant yet more bone formation and less gap distance was observed around implants in both groups la and IIb, larger gaps were detected in group Ila. Finally, SPECT and SEM both offer an elegant model for evaluation of implant osseointegration. Radio-nuclide imaging is much more sensitive to early or small changes in bone than other imaging systems. Growth factors are a realistic method to improve and expedite both soft and hard tissue healing

Evaluation of the paraskeletal clamps system [Mennen plate] in treatment of mandibular fractures

In this study, we used the relatively recent Paraskeletal clamp system [Mennen plate] to evaluate its effectiveness in the treatment of mandibular fractures. This study was conducted on eight patients with mandibular fractures selected from the out patient clinic, Oral Surgery Department, Faculty of Oral and Dental Medicine, Cairo University. Patient sample consisted of six males and two females, four patients were children below the age of 11 years, while the other four were edentulous above the age of 58. Each patient was thoroughly examined both clinically and radiographically. Data collected from each patient were recorded in a special examination chart. Under general anesthesia, the fracture was exposed using a submandibular approach. The fractured segments were reduced and fixed using micro-5 Mennen plates. All patients were followed up both clinically and radiographically for six months postoperatively. Results obtained from this study showed uneventful healing of all patients with no cases of non-union, bony infection or osteomyelitis as proven both clinically and radiographically. All the patients presented normal functioning occlusion and facial symmetry. No bony step deformities were detected