Mohammad Hossein Toodehzaeim; Seyed Morteza Saadat Mostafavi
Abstract
Background: The aim of this study was to verify the prevalence of three different morphologies of the mandibular and maxillary dental arch in natural normal occlusions and that may help guiding orthodontists customizing shape of orthodontic archwires. The orthodontist should know the mean of inter-canine ...
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Background: The aim of this study was to verify the prevalence of three different morphologies of the mandibular and maxillary dental arch in natural normal occlusions and that may help guiding orthodontists customizing shape of orthodontic archwires. The orthodontist should know the mean of inter-canine and inter-molar width of Iranian population to help as a guide of treatment.
Methods: We examined 132 study models including 66 maxillary and 66 mandibular arches. Three square, ovoid, and tapered templates were overlaid on arches using special software. Samples were categorized according to the adaptability of templates on images. Inter canine and inter molar widths were also measured on casts and recorded. Results: Ovoid was the most frequent form (54%) in Iranian population. Tapered (36%) and square (10%) forms were on second and third steps, respectively. The relative frequencies of tapered and ovoid forms were equal in the mandibular arch while in the maxillary arch, the frequency of ovoid (63%) was significantly higher than tapered (27%).
Conclusions: Ovoid is the most common dental arch form in Iranian population.
Elahe Soltanmohamadi Borujeni; Homa Farhadifard
Abstract
Context: The use of skeletal anchorage not only changed how far teeth can be moved, but also offered more treatment options to patients and clinicians. So many orthodontists use them in severe malocclusions to save patient from orthognatic surgery and the other invasive treatment plans. So our information ...
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Context: The use of skeletal anchorage not only changed how far teeth can be moved, but also offered more treatment options to patients and clinicians. So many orthodontists use them in severe malocclusions to save patient from orthognatic surgery and the other invasive treatment plans. So our information about them must increase to use them in a right way.
Evidence Acquisition: To know recent findings about miniscrews and their use in orthodontic treatments
Results: In this review article, by focusing on the newest papers published in PubMed (from 2010 - 2015) we want to survey the most common applications of miniscrews in today orthodontics. To ease reading this paper, applications where divided into 7 groups. Almost all of papers used in this article had a common conclusion about safety and effectiveness of miniscrews in treatment of patients.
Conclusions: miniscrews are helpful in increasing treatment options for various malocclusions and they make treatment simpler, shorter and more comfortable for patients and clinicians.
Mahtab Nouri; Sohrab Asefi
Abstract
Introduction: The role of nasal septum in development of the maxilla after birth remains to be a question. Study of monozygotic twins may elucidate the role of epigenetic factors in growth and development of craniofacial structures.
Case Presentation: Herein, we report a case of 16 year-old male monozygotic ...
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Introduction: The role of nasal septum in development of the maxilla after birth remains to be a question. Study of monozygotic twins may elucidate the role of epigenetic factors in growth and development of craniofacial structures.
Case Presentation: Herein, we report a case of 16 year-old male monozygotic twins with Angle class III malocclusion and high angle facial pattern. One of them (patient M.H) had a history of mid-face trauma at the age of 6. Radiographic and clinical examinations revealed significant nasal septum deviation and the patient demonstrated nasal airway obstruction on the right side. The effects of this traumatic injury and the consequences of septal deviation were evident both clinically and radiographically at the age of 16. Increased airway resistance caused by septal deviation significantly affected the arch form and the configuration of the nose. The overall facial growth pattern is predetermined genetically but vertical dimension of the face may be more influenced by the environmental factors.
Conclusions: Patients should be carefully monitored after trauma to the nose and face and any deviation in the facial structure should be treated promptly in order to prevent asymmetries.
Susan Sadeghian; Nasim Esnaashari; N. Ghoreishi
Abstract
Background and aim: The objective of this study is determining the correlation among the dental crowding and mesiodistal tooth width and dental arch dimensions.Materials and methods: In this case-control study dental casts of two groups of 40 subjects was investigated. Each group included 20 male and ...
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Background and aim: The objective of this study is determining the correlation among the dental crowding and mesiodistal tooth width and dental arch dimensions.Materials and methods: In this case-control study dental casts of two groups of 40 subjects was investigated. Each group included 20 male and 20 female subjects with the age range of 17 to 25 years old.
The first group had class I malocclusion with nominal or no crowding. (space deficiency ≤ 4).
The second group had class I malocclusion with significant crowding. (space deficiency ≥ 4).
The following parameters were measured and compared in both groups:The sum of mesiodistal tooth width, arch length in canine and molar spaces and arch perimeter. In order to compare the two group independent t-test with 95% confidence was applied.Results: In lower arch a significant difference was detected in both tooth size (P=0/02) and arch dimensions. The group with the significant crowding has smaller arch dimension and larger tooth size in comparison to the group with no crowding. In the upper arch a significant difference in intercanine width (P=0/01), arch perimeter (P=0/023), arch length (P=0/012), and intermolar width (P=0/03) was detected.Conclusion: The results of this study indicated that in upper arch the arch dimensions plays a significant role in crowding, and in the lower one both tooth size and arch dimensions have important role in crowding.
Abu-Hussein Muhamad
Abstract
The development of human dentition from adolescence to adulthood has been the subject of extensive stud by numerous dentists, orthodontists and other experts in the past. In recent years, substantial effort has been evident in the field of mathematical analysis of the dental arch curve, particularly ...
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The development of human dentition from adolescence to adulthood has been the subject of extensive stud by numerous dentists, orthodontists and other experts in the past. In recent years, substantial effort has been evident in the field of mathematical analysis of the dental arch curve, particularly of children from varied age groups and diverse ethnic and national origins. The proper care and development of the primary dentition into permanent dentition is of major importance and the dental arch curvature, whose study has been related intimately by a growing number of dentists and orthodontists to the prospective achievement of ideal occlusion and normal permanent dentition, has cluded a proper definition of form and shape. Authors have put forth mathematical models to describe the teeth arch curve in humans. Some have imagined it as a parabola, ellipse or conic while others have viewed die same as a cubic SP-Line. Still others have viewed the beta function as best describing the actual shape of the dental arch curve. Both finite mathematical functions as also polynomials ranging from 2nd to 6th order have been cited as appropriate definitions of the arch in various studies by eminent authors. Each model had advantages and disadvantages, but none could exactly define the shape of the human dental arch curvature and factor in its features like shape, spacing and symmetry/asymmetry, This paper presents key mathematical models and compares them through some secondary research study.
