Maryam Poosti; Fariborz Amini; Alireza Darnahal; P. Mokhnefi
Abstract
Background and aim: The form of the facial skeleton and dental relationship is race specific, and estimating the cephalometric standards in each race is important. The purpose of this study was to determine the McNamara's Analysis standards in Iranian population and to compare them in Iranian men and ...
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Background and aim: The form of the facial skeleton and dental relationship is race specific, and estimating the cephalometric standards in each race is important. The purpose of this study was to determine the McNamara's Analysis standards in Iranian population and to compare them in Iranian men and women. Materials and Methods: In this Cross Sectional study cephalograms of 75 Iranian adults (18-35yrs) including 36 males and 39 females that represented Class I skeletal relationship, normal vertical pattern and space deficiency less than 3mm were selected Eleven indexes of McNamara Analysis were manually traced and analyzed. Mann-Whitney and Independent t-tests were used to compare values between males and females. Results: It was shown that there is significant difference in effective length of mid face, mandibular length and lower one third height between men and women (p<0.05). Our study findings was very similar to McNamara`s norms.Conclusion: Despite the larger jaw dimensions in Caucasian compared to Iranian ethnic group. McNamara analysis can be applied for Iranian population.
Maryam Omidkhoda; Zoha Sahebnasagh; Maryam Poosti; M. Yaghoobi; A. Izadpanahi
Abstract
Introduction: Since orthodontic therapy may have detrimental effects to the tooth structures or periodontium, practitioners recommend their patients to use different mouth washes. These chemical agents may be potentially damaging to metal components of orthodontic appliances. The aim of the present study ...
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Introduction: Since orthodontic therapy may have detrimental effects to the tooth structures or periodontium, practitioners recommend their patients to use different mouth washes. These chemical agents may be potentially damaging to metal components of orthodontic appliances. The aim of the present study was to evaluate the effect of three common mouthwashes on mechanical properties of NiTi orthodontic wires.
Materials and Methods: 27 pieces of 0.016inch Niti wires were randomly assigned into 9 groups including 3 control and 6 experimental groups. After the first month of immersion in artificial saliva, the wires in 3 groups were immersed in Chlorhexidine, Persica and Hydrogene Peroxide for 30min, 1.5h and 1.5h respectively. The control groups included as received wires, wires immersed only in artificial saliva and Saliva + tooth brush. Mechanical properties of the wires were evaluated by three point deflection test. Two way ANOVA and Tukey tests were used to compare groups.
Results: Persica caused significantly lower force in 2 and 3 mm deflection during loading compared to Peroxide, chlorhexidine and “as received”. Chlorhexidine also significantly reduced the loading force during 3mm deflection in comparison to saliva control. In 2 mm deflection during unloading Persica significantly reduced unloading force in comparison to all groups including: chlorhexidine, peroxide, saliva control and “as received”. It is also seen that chlorhexidine caused lower force compared to saliva control. Then, NiTi wires in 3 groups underwent 3200 tooth brushing cycles and were compared with each other and with 2 control groups (saliva + brushing and "as received" ) by Tukey test. The results showed that only in 3mm loading deflection there was significant difference between Persica and Peroxide, and also between peroxide and as received wires.Conclusion: Persica was the most effective mouthwash on mechanical properties of NITI wires.
