Fariborz Amini - Academia.edu (original) (raw)

Papers by Fariborz Amini

Journal of the California Dental Association, Mar 1, 2013

International Orthodontics, 2017

Resume Historique et objectifs Les valeurs cephalometriques et celles de l’arcade peuvent predire... more Resume Historique et objectifs Les valeurs cephalometriques et celles de l’arcade peuvent predire la survenue d’une canine maxillaire incluse palatine (CMIP). Malgre leur importance clinique, les etudes a ce sujet sont rares et controversees. Methodes Dans cette etude cas-temoins, 35 patients CMIP et 77 temoins âges de plus de 13 ans ont ete examines. Onze mesures cephalometriques ont ete realisees : N-S, ANS-PNS, ANS-N, S-N-ANS, angle facial (FH/NPog), SNA, SNB, axe- Y (SN/SGn), angle gonial, Go-Gn/SN, et l’index Jarabak. Les largeurs intermolaires et interpremolaires maxillaires et mandibulaires ont ete mesurees. Les relations squelettiques sagittales et les occlusions centriques (molaires) ont ete mesurees sur radiographies et sur moulages. Les differences entre les deux groupes en relation avec les variables cephalometriques et anatomiques ci-dessus mentionnees ont ete evaluees en utilisant le test du Chi 2 et le test de Mann-Whitney U ( α = 0,05). Resultats Le test du Chi 2 a revele une association negative significative entre la classe I dentoalveolaire (molaire) et l’apparition d’une CMIP ( p = 0,018), mais pas entre la CMIP et les relations squelettiques sagittales. L’angle facial (FH/NPog) et l’axe- Y (SN/SGn) etaient plus ouverts chez les patients avec CMIP ( p Conclusions La CMIP a tendance a etre associee aux classes II/III molaires mais n’est pas associee aux largeurs ou longueurs d’arcade maxillaires ou mandibulaires. Les dimensions verticales sont parfois plus reduites chez les patients avec CMIP. Certaines variables etaient peu concluantes et auraient besoin d’etre reevaluees dans de nouvelles etudes.

International orthodontics, 2017

Cephalometric and arch measurements might predict the occurrence of a palatally-displaced impacte... more Cephalometric and arch measurements might predict the occurrence of a palatally-displaced impacted maxillary canine (PDC). Despite their clinical importance, studies in this regard are limited and controversial. In this case-control study, 35 PDC patients and 77 controls aged over 13 years were examined. Eleven cephalometric measurements: N-S, ANS-PNS, ANS-N, S-N-ANS, facial angle (FH/NPog), SNA, SNB, Y-axis (SN/SGn), gonial angle, Go-Gn/SN, and Jarabak Index were performed. The maxillary and mandibular intermolar and interpremolar widths were measured. Patients' sagittal skeletal relationships and centric occlusions (molar) were measured by radiographic and cast examinations. The differences between the two groups in terms of the above-mentioned cephalometric and anatomic variables were assessed using Chi(2) and Mann-Whitney U-tests (α=0.05). Chi(2) showed a significant negative association between dentoalveolar class I (molar) and PDC occurrence (P=0.018), but not between PDC ...

American Journal of Orthodontics and Dentofacial Orthopedics, 2016

Nickel and chromium might induce hypersensitivity. Therefore, they are of interest to orthodontis... more Nickel and chromium might induce hypersensitivity. Therefore, they are of interest to orthodontists. Gingival crevicular fluid (GCF) is highly relevant to orthodontic treatments and might reflect systemic changes associated with the inflammatory response induced by orthodontic forces. Therefore, it might also be used to show metal ion changes. Nevertheless, baseline metal levels of GCF are unknown, and the effect of orthodontic treatment on GCF metal levels has not been investigated. The aim of this study was to assess the levels of nickel and chromium in GCF. Based on a pilot study, the sample size was predetermined as 24 × 3 measurements to obtain test powers above 90%. Nickel and chromium concentrations were measured before treatment and 1 month and 6 months later in 12 female and 12 male patients who had fixed orthodontic appliances using atomic absorption spectrophotometry. The gingival index was also evaluated in each session. The effects of treatment on GCF ions were analyzed using repeated-measures analysis of variance and Friedman tests (α = 0.05, β ≤0.01). The gingival index worsened over time (chi-square test, P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.001). The mean nickel levels were 3.894 ± 1.442, 5.913 ± 2.735, and 19.810 ± 8.452 μg per gram, respectively, at baseline, month 1, and month 6. Chromium concentrations were 1.978 ± 0.721, 4.135 ± 1.591, and 13.760 ± 3.555 μg per gram, respectively. Compared with the baseline, nickel increased by 150% and 510%, respectively, in the first and sixth months (Friedman, P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.0001), and chromium increased by 200% and 700%, respectively (analysis of variance, P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.0001). Six months of fixed orthodontic treatment might intensify the levels of nickel and chromium in the GCF as well as gingival inflammation.

Iranian journal of public health, 2013

Awareness of hyperdontia pattern/prevalence can be useful in early diagnosis and prevention by ge... more Awareness of hyperdontia pattern/prevalence can be useful in early diagnosis and prevention by general practitioners, pediatric dentists, and orthodontists. Since the previous results regarding the pattern of hyperdontia (supernumerary teeth) are controversial, this study aimed to assess this subject among Iranian orthodontic patients. All approved panoramic radiographs of 3374 orthodontic patients (aged 10 to 20 years old) who had visited orthodontic departments of all Tehran dentistry universities and 10 private clinics during the years 1999-2009 were investigated to establish the prevalence/pattern of hyperdontia in permanent dentition (excluding third molars). The data were analyzed using a chi-square, a chi-square goodness-of-fit, and a Fisher exact test (α=0.05). Of the patients, 2012 were female and 1362 were male. The prevalence of hyperdontia was 0.72% (14 females [0.69% of females], 10 males [0.73% of males], female-to-male ratio=1:1.055). The difference between the gender...

Objective – To study cephalometric and facial features of Iranian children with beta-thalassemia ... more Objective – To study cephalometric and facial features of Iranian children with beta-thalassemia major. Design – Lateral cephalometric radiographs of thalassemic patients and controls who were matched for age, sex and ethnic origin were analyzed and compared. Setting and Sample Population – A total of 30 thalassemic patients (18 male and 12 females) from Aliasghar Hospital, and 30 controls from the Orthodontic Department of Azad University. Outcome measure – Size and shape differences in the craniofacial complex between thalassemic patients and controls. Results – All thalassemic patients had a Class II skeletal base relationship with an average ANB angle of 8.75�. There was no record of dramatic maxillary prognathism. However, the mandible of the thalassemic patients appeared to be smaller in size and more retruded in the face. A pronounced vertical growth direction was evident from angular and linear measurements. The dental deviations in thalassemic patients were mainly seen in t...

International journal of orthodontics (Milwaukee, Wis.), 2013

In this report, we present an uncomplicated approach to overcome lingual rolling of mandibular mo... more In this report, we present an uncomplicated approach to overcome lingual rolling of mandibular molars during orthodontic treatment, by using rectangular NiTi arch wire in twist fashion through the molar tube. The sequential steps of the twist manoeuvre on a typodont and a case report are exhibited in this article.

ABSTRACT Background & Aim: Since making a proper orthodontic treatment plan is highly bas... more ABSTRACT Background & Aim: Since making a proper orthodontic treatment plan is highly based on a thorough understanding of growth changes in dentofacial complex and due to relatively high prevalence of Class II malocclusion cases, this study was conducted to evaluate Dentoskeletal growth changes in 7-12 year old class II subjects. Methods & Materials: In this longitudinal study, 8 schools were randomly selected in Tehran. After examination of 1886 students, 73 subjects were chosen according to special criteria, all demonstrating a Cl II molar and canine relationship. Lateral cephalogram radiographs were obtained from these individuals under NHP position in dental school of Islamic Azad University. After a period of 2 years 43 of them (23 males&20 females) could be recalled and again lateral cephalograms were taken under the same condition. The two series of cephalograms were traced and 26 angular and linear measurements were evaluated. Data were analyzed using Paired t, Wilcoxon and Mann Whitney U test. Result: All the 43 subjects in this research were categorized into 4 groups according to sex and age (7-9 and 10-12 year old). The 26 evaluated parameters demonstrated different dental and skeletal growth changes. Conclusion: Results of this study can be used as control data for evaluation of orthodontic treatment procedures, especially those involving growth modifications.

Dental research journal, 2012

Hypodontia is the most common dental anomaly and might cause clinical complications. The aim of t... more Hypodontia is the most common dental anomaly and might cause clinical complications. The aim of this study was to assess the prevalence and pattern of congenital missing in the permanent dentition dentition (excluding third molars), among Iranian orthodontic patients. In this descriptive cross-sectional study, all approved panoramic radiographs of 3374 orthodontic patients (aged 10 to 20 years old), who had visited the Orthodontic Departments of all Tehran Dentistry Universities and 10 private clinics during the years 1999 to 2009 were investigated, to establish the prevalence of hypodontia in the permanent dentition (excluding third molars). The data were analyzed using a chi-square test (α = 0.01). Included were 2012 female and 1362 male patients. The prevalence of hypodontia was 5.21% (5.86% in females, 4.25% in males). The difference between the genders in terms of missing teeth was not significant (P = 0.202). A total of 298 teeth were missing (166 in females, 132 in males). Th...

European journal of orthodontics, Jan 17, 2014

Summary INTRODUCTION: Despite the importance of nickel and chromium release from orthodontic brac... more Summary INTRODUCTION: Despite the importance of nickel and chromium release from orthodontic brackets, there are no in vivo or in vitro studies on this issue in the case of metal-injection molding (MIM) brackets. Saliva samples were collected from 30 orthodontic patients divided randomly into two groups of conventional and MIM brackets, before treatment and 2 months later. Approved attendees with odd and even numbers were, respectively, assigned to the control and treatment groups. For blinding, the patients were not informed of their bracket types, and the saliva samples were coded. Nickel and chromium levels were determined using atomic absorption spectrophotometry. Data were analysed using repeated-measures two-way analysis of covariance, independent-samples t-test, chi-squared, Spearman and point-biserial correlation coefficients, Mann-Whitney, and Wilcoxon tests (α = 0.05). Mean nickel level increased from 7.87±8.14 (pre-treatment) to 12.57±9.96 (2nd month) in the control group...

Journal of Craniofacial Surgery, 2014

Limited data are available regarding the reference ranges of facial proportions of the Persian po... more Limited data are available regarding the reference ranges of facial proportions of the Persian population in Iran. This study aimed to establish the reference range of craniofacial anthropometric measurements in an adult Iranian population. On 100 individuals (men = women), aged 18 to 30 years with normal faces and occlusions, 34 linear and 7 angular measurements as well as 24 indices were calculated. The difference of measurements between men and women were evaluated by paired t-test. The data were compared with the norms of North American whites using 1-sample t-test. The subjects belonged to 5 ethnic groups (57% from Fars, 14% from Kord, 11% from Azari, 10% from Gilaki-Mazani, and 2% from Lor). All head measurements were greater in men except for the head index and the head height. The subjects had leptoprosopic faces. The intercanthal width was almost one third of the biocular width and greater than the eye fissure length. Although the nose width of women was significantly smaller, both sexes had leptorrhine noses. The chin height and lower chin height were greater in men. In comparison with North American whites, considerable differences were found regarding head height and width, biocular width, nose height, face height, mouth width, and upper chin height. In conclusion, the reference range of craniofacial anthropometric measurements established for the Iranian population might be efficiently used for esthetic treatments.

Biological Trace Element Research, 2012

Biological Trace Element Research, 2014

Although nickel and chromium are known as allergen and cytotoxic orthodontic metals, very few and... more Although nickel and chromium are known as allergen and cytotoxic orthodontic metals, very few and controversial studies have assessed the effect of orthodontic treatment on their systemic levels reflected by their best biomarker of exposure, hair. This prospective preliminary study was conducted to evaluate hair nickel and chromium levels in fixed orthodontic patients. Scalp hair nickel/chromium concentrations of 12 female and 12 male fixed orthodontic patients were measured before treatment and 6 months later, using atomic absorption spectrophotometry. The effects of treatment, gender, and age on hair ions were analyzed statistically (α = 0.05). The patients&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39; mean age was 18.38 ± 3.98 years. The mean nickel levels were 0.1380 ± 0.0570 and 0.6715 ± 0.1785 μg/g dry hair mass, respectively, in the baseline and sixth month of treatment. Chromium concentrations were 0.1455 ± 0.0769 and 0.1683 ± 0.0707 μg/g dry hair mass, respectively. After 6 months, nickel increased for 387 % (paired t test P = 0.0000) and chromium increased for 16 % (P = 0.0002). No significant correlations were observed between any ion levels with age or gender (Spearman P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; 0.2). Within the limitations of this preliminary study, it seems that 6 months of fixed orthodontic treatment might increase levels of hair nickel and chromium. Future larger studies are necessary to validate these results.