Hooman Shafaee; Hamidreza Aboutorabzadeh; Hossein Bagheri; Banafsheh Yaloodbardan; Abdolrasoul Rangrazi
Abstract
BackgroundNano-fluorohydroxyapatite (nano-FHA) is a caries preventive agent that is applied in many fields of dentistry and has the potential of being added to Essix retainers to create antibacterial properties. Objectives The purpose of this study was to investigate the effect of nano-fluorohydroxyapatite ...
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BackgroundNano-fluorohydroxyapatite (nano-FHA) is a caries preventive agent that is applied in many fields of dentistry and has the potential of being added to Essix retainers to create antibacterial properties. Objectives The purpose of this study was to investigate the effect of nano-fluorohydroxyapatite addition on the tensile strength and modulus of elasticity of an Essix plate. Methods The nano-fluorohydroxyapatite was synthesized and added to an Essix plate in various weight percentages: 0% (group 1), 0.1% (group 2) and 0.5% (group 3). We performed the measuring of flexural strength and modulus of elasticity for the experimented three groups using a universal testing machine. The data were analyzed through one-way ANOVA and Tukey’s test at the significance level of 0.05. ResultsAccordingly, the obtained results were indicative of significant differences between the groups (P-value = 0.003); however, the difference between group 2 and control group was not statistically notable (P-value = 0.427). Furthermore, the tensile strength of group 3 significantly decreased (P-value = 0.04). In regards to the modulus of elasticity, the data were suggestive of significant differences between the groups (P-value = 0.002). Apparently, the modulus of elasticity of group 2 and group 3 decreased significantly compared to that of the control group (group 1). Conclusions We can conclude that nano-FHA can be incorporated into Essix plates in concentrations of up to 0.1 wt% in order to create some caries preventing effects with no negative effects on tensile strength; however, adding nano-FHA to Essix plate will decrease modulus of elasticity.
Mostafa Abtahi; Negin Azizzadeh; Hossein Bagheri; Alireza Ghasemzadeh
Abstract
BackgroundRecognizing and reviewing the educational curricula of the specialized fields of dentistry and comparing it with the curricula of the top universities in the world will help to provide the necessary changes and corrections in postgraduate dental education, leading to more skilled specialists. ...
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BackgroundRecognizing and reviewing the educational curricula of the specialized fields of dentistry and comparing it with the curricula of the top universities in the world will help to provide the necessary changes and corrections in postgraduate dental education, leading to more skilled specialists. Objectives The aim of this study was to compare the orthodontics post graduate curriculum of Mashhad dental school with the top 10 international dental schools. Methods Twenty-two of the world's top universities (10 main and 12 reserve) that offer orthodontics postgraduate programs were selected. A checklist including eight key factors and some secondary variables was prepared. These factors were classified as quantitative and qualitative. The checklist was filled with information provided by university websites and contacting program directors using email. A sample t-test and descriptive-analytic approach were respectively used to analyze the quantitative and qualitative data. ResultsAmong the quantitative factors that were evaluated, only the “percentage of completely treated patients” was significantly lower in Mashhad dental school compared with that of the top 10 international dental schools. There was no significant difference regarding the length of study, the number of professors, and the number of patients visited by each resident. Among the qualitative factors, the most diversity was seen in certificates awarded to graduates. Conclusions No significant difference was observed in didactic education, clinical training, and research project conduction between the orthodontics post graduate program of Mashhad dental school and top-tier international universities.
