fariborz amini - Academia.edu (original) (raw)

Papers by fariborz amini

Journal of Dental Medicine, 2009

Abstract: Background and Aim: In treatment of posterior crossbite awareness of the effects of Haa... more Abstract: Background and Aim: In treatment of posterior crossbite awareness of the effects of Haas and Hyrax rapid maxillary expanders (RME) on nasal cavity will help the clinician to select the better appliance. This study was carried out to compare the effects of Haas and ...

Journal of Dental Medicine, Nov 10, 2009

International Orthodontics, Mar 1, 2023

The Korean Journal of Orthodontics, 2015

The Korean Journal of Orthodontics, 2016

Journal of the California Dental Association, 2013

This report presents the treatment of a patient with skeletal Class III relationship in the perma... more This report presents the treatment of a patient with skeletal Class III relationship in the permanent dentition caused by maxillary hypoplasia. The treatment plan called for palatal expansion and maxillary advancement. Titanium miniscrews were placed in the mandible to facilitate the maxillary protraction after maxillary expansion. An increase of projection of the upper jaw relative to the cranial base and to the lower jaw and significant improvement of the facial profile were observed.

Sleep and Breathing, 2012

Orthodontics & Craniofacial Research, 2007

Orthodontics & craniofacial research, 2008

To compare the concentration of nickel, chromium and cobalt in oral mucosa cells of patients with... more To compare the concentration of nickel, chromium and cobalt in oral mucosa cells of patients with and without fixed orthodontic appliances.

American Journal of Orthodontics and Dentofacial Orthopedics, 2003

Interest in the amount of metal ion intake from dental alloys has grown. Fixed orthodontic applia... more Interest in the amount of metal ion intake from dental alloys has grown. Fixed orthodontic appliances usually include brackets, bands, and archwires made of stainless steel, nickel-titanium, or nickel-cobalt alloys, and these can release metal ions. The purpose of this study was to investigate the biocompatibility in vivo of fixed orthodontic appliances, evaluating the presence of metal ions in oral mucosa cells, their cytotoxicity, and their possible genotoxic effects. Mucosa samples were collected by gentle brushing of the internal part of the right and left cheeks of 55 orthodontic patients and 30 control subjects who were not receiving orthodontic treatment. The cells were immediately prepared for cell viability and the comet assay. Nickel and cobalt cellular content was quantified by inductively coupled plasma mass spectrometry (ICP-MS). The results indicate that nickel and cobalt concentrations were 3.4-fold and 2.8-fold higher, respectively, in the patients than in the controls; cellular viability was significantly lower in the patients than in the controls, and there was a significant negative correlation with metal levels. The biologic effects, evaluated by alkaline comet assay, indicated that both metals induced DNA damage (more cells with comets and apoptotic cells). There were significant positive correlations between (1) cobalt levels and the number of comets and apoptotic cells, (2) nickel levels and number of comet cells, and (3) cobalt levels and comet tails. This study corroborates that nickel and cobalt released from fixed orthodontic appliances can induce DNA damage in oral mucosa cells.

Acta Odontologica Scandinavica, 2012

Biological trace element research, 2012

Effect of long-term orthodontic treatment on salivary nickel and chromium has not been quite asse... more Effect of long-term orthodontic treatment on salivary nickel and chromium has not been quite assessed except in few retrospective studies with controversial results. The aim of this prospective study was to measure salivary levels of these ions during 1 year of orthodontic treatment. Saliva samples were collected from 20 orthodontic patients, before treatment (control) and 6 and 12 months later. Nickel and chromium concentrations were determined using atomic absorption spectrophotometry. Data were analyzed using one- and two-way repeated-measures ANOVA, Bonferroni, Friedman (α = 0.05), and Wilcoxon signed-ranks tests (α = 0.016). Average nickel level changed from 9.75 ± 5.02 to 10.37 ± 6.94 and then to 8.32 ± 4.36 μg/L in 1 year. Average chromium concentration changed from 3.86 ± 1.34 to 4.6 ± 6.11 and then to 2.04 ± 1.66 μg/L. Alterations in nickel values were not statistically significant [P = 0.468 (ANOVA)], but fluctuations in chromium levels were [P = 0.021 (Friedman)]. The dec...

International journal of orthodontics, 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.

Iranian Journal of Public Health, 2013

Background Awareness of hyperdontia pattern/prevalence can be useful in early diagnosis and preve... more Background 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. Methods 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). Results 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 di...

Bioscience Biotechnology Research Communications

Biological Trace Element Research

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 ...

Implant Dentistry, 2017

We aimed to evaluate the associations between the craniofacial growth pattern with interradicular... more We aimed to evaluate the associations between the craniofacial growth pattern with interradicular distances (IRDs), cortical widths (CWs), and jaw heights (JHs). Also, we mapped safe zones for miniscrew implantation. Cone-beam computerized tomography data pertaining to 60 Class-I patients were divided into 3 growth groups: normal, horizontal, and vertical. IRDs and CWs were measured for bimaxillary canines to second molars, on buccal and lingual sides, at 3 transverse planes (1, 3, and 5 mm apically to the alveolar crest). JHs were measured in both jaws, between canines and second molars. The role of growth patterns and other variables were analyzed; also, safe zones were mapped with statistical substantiation. IRDs were greater in the mandible, males, at points more distant from the ridge crest, and on the lingual side. Cortexes were thicker in the horizontal growth pattern, mandible, males, older patients, and lingual sides. JHs were greater in vertical growth pattern, mandible, and males. The cortex might be thicker in patients with a horizontal growth pattern. The height might be greater in vertical growth pattern. IRDs might not be affected by growth pattern.

American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics, 2017

Head and neck skeletal anomalies or normal variants might predict the occurrence of palatally dis... more Head and neck skeletal anomalies or normal variants might predict the occurrence of palatally displaced impacted maxillary canines. Despite their clinical importance, studies in this regard are rare, especially when it comes to vertebral anomalies. This case-control study was performed on cephalographs of 35 orthodontic patients (11 male, 24 female) with palatally displaced canines (PDC) and 75 patients without them (29 male, 46 female). PDC were diagnosed on panoramic and lateral cephalographs and from clinical reports. The occurrence and severity of sella turcica bridge and the atlas ponticulus posticus, and deficiency of the posterior atlas arch were evaluated twice on lateral cephalographs. The associations between the occurrence and level of these skeletal anomalies and variations of PDC occurrence as well as additional correlations were assessed using multivariable and bivariate statistics (α = 0.05; β ≤0.2). The patients' mean age was 18.4 ± 1.9 years. In the control and ...