Effect of Royal Jelly on new bone formation in rapid maxillary expansion in rats

Background: The aim of this study was to evaluate the effects of long and short term systemic usage of royal jelly on bone formation in the expanded maxillary suture in a rat model. Material and Methods: Twenty eight Wistar albino rats were randomly divided into 4 equal groups: Control (C); Only Expansion (OE), Royal Jelly (RJ) group, Royal Jelly was given to rats by oral gavage only during the expansion and retention period; Royal Jelly plus Nursery (RJN) group, Royal Jelly was given to rats by oral gavage during their nursery phase of 40 days and during the retention period. After the 5 day expansion period was completed, the rats underwent 12 days of mechanical retention. All rats were sacrificed in same time. Histological examination was performed to determine the number of osteoclasts, number of osteoblasts, number of capillaries, inflammatory cell infiltration, and new bone formation. Results: New bone formation, number of osteoclasts, number of osteoblasts, and the number of capillaries in the expanded maxillary sutures were higher in the RJ and RJN groups than in the other groups. Statistical analysis also demonstrated that new bone formation and the number of osteoblasts was also highest in the RJN group. Conclusions: The systemic administration of Royal Jelly in conjunction with rapid maxillary expansion may increase the quality of regenerated bone

Physical Properties of Different Orthodontic Composites

Objective:The aim of this study was to compare the water sorption, solubility, and compressive strength of 3 traditional orthodontic composites and 1 flowable composite after 1, 7, and 30 days of immersion in water.Materials and Method:The traditional orthodontic composites used in this study were ORTHO Bracket Paste (Bisco, Schaumburg, IL, USA), Transbond XT (3M, Monrovia, CA, USA), and Light Bond (Reliance, Itasca, IL, USA). The flowable composite used was Tetric EvoFlow (Ivoclar Vivadent, Schaan, Liechtenstein). The specimens were subjected to water sorption and solubility tests based on the ISO 4049 and ADA No. 8 requirements. Mechanical tests were performed with an Instron Universal Test Machine.Results:There were no significant differences in solubility among the 4 materials after 1 and 7 days (p > 0.05). Tetric EvoFlow had a lower compressive strength than the traditional orthodontic composites (p > 0.05) and exhibited significantly higher water sorption than the traditional orthodontic composites after immersing them in water for 1, 7, and 30 days (p < 0.001).Conclusion:The results revealed that the flowable composite had higher solubility and water absorption but less compressive strength than the traditional orthodontic composite resins used in this study