F. FarahBakhsh; Fariborz Amini
Abstract
Background and aim: Knowledge of arch width characteristics in different malocclusion types such as Class II/2 malocclusion have considerable implications in orthodontic diagnosis and treatment planning. The purpose of this study was to compare the transverse dimensions of the dental arches in an Iranian ...
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Background and aim: Knowledge of arch width characteristics in different malocclusion types such as Class II/2 malocclusion have considerable implications in orthodontic diagnosis and treatment planning. The purpose of this study was to compare the transverse dimensions of the dental arches in an Iranian plaster cast samples with Class II division 2 (II/2) malocclusion and class I malocclsion.Materials and methods: In this case-control study, maxillary and mandibular intercanine (IC) and intermolar (IM) arch widths measured and recorded from 26 subjects with Class II/2 malocclusion. The data were compared with 26 control subjects with class I malocclsion.Results: In the Class II/2 group, the IC widths and IM widths in both arches were less than those in the control sample. Howeverstatistically significant difference was found only in maxillary IM width (p=0.001).Conclusion: The findings indicated that although both maxillary and mandibular arches are narrower in Class II/2 patientsbut posterior segment of maxilla is the site which is mostly affected by the Class II/2 etiologic factors.
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.
Fariborz Amini; Maral Khazali; Farhang Mahmodei; Siamak Hematpour
Abstract
Objective: The aim of this study was to determine salivary concentrations of Nickel , Chromium and Cobalt ions in patients with fixed orthodontic appliances. Materials and Methods: This study was performed on salivary samples of 60 subjects including 30 subjects (20 females and 10 males) who were ...
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Objective: The aim of this study was to determine salivary concentrations of Nickel , Chromium and Cobalt ions in patients with fixed orthodontic appliances. Materials and Methods: This study was performed on salivary samples of 60 subjects including 30 subjects (20 females and 10 males) who were under orthodontic treatment with fixed orthodontic appliance for average of 1.5 to 2 years as study group and 30 individuals(20 females and 10 males) without any appliance therapy as control group. The chemical analyses of saliva was done with an electrothermal atomic absorption spectrophotometry to detect the metal ion content of the saliva. The Mann-Whitney u-test was used to analyze significance of the differences between two groups. Results: Examining the content of Nickel in the saliva of orthodontic patients and controls, the Nickel content of saliva in study group was significantly higher than the controls (p < 0.01). The mean salivary Chromium content was 13.60 ± 7.30 ng ⁄ ml, and 1.40 ± 4.80 ng/ml in subjects with and without orthodontic appliances respectively. Statistically significant differences were found between the groups (P < 0.002).Conclusion: fixed orthodontic appliances release measurable amount of Nickel and Cobalt when placed in the mouth however; this increase doesn’t reach toxic levels in saliva.
