Comparison of two asymmetric headgear force systems: A finite element analysis.

Objective: The aim of this study was to evaluate the effect of displacement patterns of the molar teeth in response to different asymmetric headgear loading using 3D finite element method.

Methods: A series of twenty-five facebow with different left vs. right outer bow length and different expansion of left vs.

Evaluation of Microleakage under Orthodontic Brackets Bonded with Nanocomposites.

Background: The aim of this study was to evaluate the microleakage value under orthodontic brackets bonded with a nano-filled composite and to compare the results with a conventional adhesive using two different bonding systems.

Materials And Methods: Forty human premolars were used in this cross-sectional study. The samples were randomly divided into four equal groups of ten: Group I: Acid etch plus Transbond XT primer and Transbond XT adhesive, Group II: Acid etch plus Transbond XT primer and nanocomposite (Filtek Z350), Group III: Scotchbond™ Universal primer plus Transbond XT, and Group IV: Scotchbond™ and nanocomposite.

Maxillary anterior en masse retraction using different antero-posterior position of mini screw: a 3D finite element study.

Background: Nowadays, mini screws are used in orthodontic tooth movement to obtain maximum or absolute anchorage. They have gained popularity among orthodontists for en masse retraction of anterior teeth after first premolar extraction in maximum anchorage cases. The purpose of this study was to determine the type of anterior tooth movement during the time when force was applied from different mini screw placements to the anterior power arm with various heights.

An Analytical Study on an Orthodontic Index: Index of Complexity, Outcome and Need (ICON).

Statement Of The Problem: The validity of the Index of Complexity, Outcome and Need (ICON) which is an orthodontic index developed and introduced in 2000 should be studied in different ethnic groups.

Purpose: The aim of this study was to perform an analysis on the ICON and to verify whether this index is valid for assessing both the need and complexity of orthodontic treatment in Iran.

Materials And Method: Five orthodontists were asked to score pre-treatment diagnostic records of 100 patients with a uniform distribution of different types of malocclusions determined by Dental Health Component of the Index of Treatment Need.

Comparison of commercially available arch wires with normal dental arch in a group of Iranian population.

Statement Of The Problem: The stability of orthodontic treatment depends on preserving the patient's pretreatment arch form and arch size during and after treatment.

Purpose: This investigation was aimed to study the size and shape of Iranian mandibular dental arch and evaluate the correlation of their average dental arch with commercially available preformed rectangular nickel-titanium arch wires.

Materials And Method: In this study, 148 subjects were selected among students of Shiraz University of Medical Sciences.

Relationship between Body Mass Index, Skeletal Maturation and Dental Development in 6- to 15- Year Old Orthodontic Patients in a Sample of Iranian Population.

Statement Of The Problem: The prevalence of overweight and obesity has been increasing markedly in recent years. It may influence growth in pre pubertal children.

Purpose: The purpose of this study was to determine whether increased Body Mass Index (BMI) is associated with accelerated skeletal maturation and dental maturation in six to fifteen years old orthodontic patients in Shiraz, Iran.

Extraction of maxillary central incisors: an orthodontic-restorative treatment.

Malformed central incisors with poor prognosis could be candidates for extraction especially in crowded dental arches. This case report refers to a 12-year-old boy who suffered from malformed upper central incisors associated with severe attrition. Upper lateral incisors were positioned palatally and canines were rotated and positioned in the high buccal area.

The prevalence and distribution pattern of hypodontia among orthodontic patients in Southern Iran.

Objectives: To evaluate the pattern and prevalence of hypodontia and its association with different malocclusions among orthodontic patients in southern Iran.

Materials And Methods: In this study, a total of 494 records of orthodontic patients (162 males, 332 females) were evaluated. To investigate percent of hypodontia pertinent information of patients was evaluated.

Orthodontic research output from iran in international and national journals.

Objective: The number of scientific papers is a conventional metric to measure a country's research performance in a particular area. The aim of this survey was to demonstrate statistical information about orthodontic research published in international and national journals.

Materials And Methods: Pubmed as an international and IranMedex and SID as national databases were searched between1997 and 2012.

Comparison of natural head position in different anteroposterior malocclusions.

Objective: The facial esthetics after orthodontic treatment and orthognathic surgery may be affected by the patient's natural head position. The purpose of this study was to evaluate the natural head position for the three skeletal classes of malocclusion.

Materials And Methods: Our sample consisted of 102 lateral cephalometric radiographs of patients aged 15 to 18 years; class I (n=32), class II (n=40) and class III (n=30).

Comparison of tooth size discrepancies among different malocclusion groups.

This retrospective investigation was designed to compare tooth size discrepancies among subjects with different skeletal malocclusions in an orthodontic population. The study employed the pre-treatment models of 200 patients (100 males, 100 females, aged from 14 to 20 years) selected from the records of the Orthodontic Department, Shiraz Dental School. The subjects were from four malocclusion groups, Class I, Class II division 1, Class II division 2, and Class III, with the corresponding skeletal characteristics.