Tahereh Hosseinzadeh-Nik; Javad chalipa; Reza Jelodar
Tahereh Hosseinzadeh-Nik; Shahin Nouroozi; Darab Gholami-Borrujeni; Negin Shahsavari
Abstract
Objective: An orthodontic treatment planning program in a specific society requires information on the orthodontic treatment needs of the population. The aims of this study were to compare the student, parent and clinician normative need and demand for orthodontic treatment between 12 and 17 years old ...
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Objective: An orthodontic treatment planning program in a specific society requires information on the orthodontic treatment needs of the population. The aims of this study were to compare the student, parent and clinician normative need and demand for orthodontic treatment between 12 and 17 years old groups in a sample of Iranian students using the IOTN.
Material and Methods: A sample of 846 students including 419 students of 12 years old and 427 students of 17 years old was selected randomly from schools in Abade. A questionnaire of family socioeconomic status was proposed to the parents. All the students were examined according to the Aesthetic and Dental Health components (AC and DHC) of Index of Orthodontic Treatment Need. Students' and parents' perceived need was also assessed using AC. Then the measurements of IOTN in both groups were compared in each component and the demands of each group were also compared with each other.
Results: According to DHC classification, 22.3% of 12 years old students and 18.7% of 17 years old students were categorized in the "no need" group; 29.5% of 12 years old and 35.6% of 17 years old students in the "border line" group and 48.2% of 12 years old group and 45.7% of 17 years old group in the "definite need" group. According to AC, in 12 years old students, the "no need", "border line" and "definite" groups included 61.9 %, 29% and 9.1% of students in turn. On the other hand, the same categories in 17 years old students assessed by the dentist were 66%, 30.2% and 3.7% respectively. (p<0.05).
Conclusion: The treatment need based on DHC and AC scores of IOTN did not differ between 12 and 17 years old groups significantly but the demand for orthodontic treatment in "definitive need" category was more in 12 years old group.
Tahereh Hosseinzadeh-Nik; Seyed Amir Reza Fatahi Meybodi; Negin Shahsavari
Abstract
Aim: This article is aimed at geometrical evaluation of antero-posterior displacement of incisor inferioris (Ii) and pogonion (Pog) following mandibular rotation and introducing a simple method to predict post surgical Holdaway ratio to evaluate the need for genioplasty.Materials and Method: First the ...
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Aim: This article is aimed at geometrical evaluation of antero-posterior displacement of incisor inferioris (Ii) and pogonion (Pog) following mandibular rotation and introducing a simple method to predict post surgical Holdaway ratio to evaluate the need for genioplasty.Materials and Method: First the geometrical factors affecting the displacement of a landmark following the mandibular rotation are discussed; namely α (the amount of mandibular rotation), r (the distance of the landmark from the center of rotation), and θ (the angle of the radius of the landmark from true horizontal line), Then the amount of displacement is calculated as d=2r[sirt(α/2)sin(α/2+θ)]. Finally prediction method of post surgical Holdaway ratio is described as adding the amount of "d " for Pog and Ii to pre surgical Holdaway ratio. This ratio in addition to position of Pog relative to facial skelton was used to predict the need for genioplasty. The application of this method is also demonstrated on an open bite patient as an example and the outcome is compared with manual prediction method.Results: The described method predicted the need for genioplasty the same way as manual prediction method.Conclusion: The geometrical prediction method can be of great value in determining the need of genioplasty following surgical mandibular rotation.
Tahereh Hosseinzadeh Nik; Shahin Nourozi; Seyed Mehdi Hosseinizade
Abstract
Aim: The purpose of this study was to investigate skeletal and dental changes during anterior tooth retrac-tion as well as upper lip response to this orthodontic treatment.
Materials and Methods: Pretreatment and post treatment lateral cephalograms of 15 post-pubertal female patients (mean age 18.2) ...
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Aim: The purpose of this study was to investigate skeletal and dental changes during anterior tooth retrac-tion as well as upper lip response to this orthodontic treatment.
Materials and Methods: Pretreatment and post treatment lateral cephalograms of 15 post-pubertal female patients (mean age 18.2) with class II division I malocclusion or bialveolar protrusion who required upper first premolar (P1) extraction were evaluated using a series of 5 linear and 9 angular measurements. All the cases were treated using combination edgewise technique. Point A displacement was then analyzed, and then the effect of orthodontic correction was determined using single variant regression analysis.
Results: On average, the maxillary incisors retraction was found to be 4.8mm which cause significant changes in SNA angle due to backward and downward movement of point A.
Conclusion: Preoral region hard tissue changes can be produced by surgical intervention, growth, ortho-pedic forces, and orthodontic movement of teeth. According to this study point A movement in post-puber-tal patients is possible but it seems surgical intervention is inevitable in severe cases. Also palatal and occlusal plane rotation occur consequent to the tooth retraction. (IJO 2006; 1: 48 - 52 )
