Parviz Padisar; Mahtab Nouri; Elham Zajkani
Abstract
Aim: One of the core parts of clinical orthodontics is the analysis of dentofacial growth. Changes that occur in the shape, form and size of dentoalveolar arch may result in various problems during diagnosis and treatment planning. The aim of this study was to investigate the late changes of alignment ...
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Aim: One of the core parts of clinical orthodontics is the analysis of dentofacial growth. Changes that occur in the shape, form and size of dentoalveolar arch may result in various problems during diagnosis and treatment planning. The aim of this study was to investigate the late changes of alignment in the anterior teeth of mandible during 4-years follow up in young adults with normal occlusion in QazvinMaterials and Methods: This was a longitudinal descriptive survey with 23 samples (13 girls and 10 boys). Subjects with an age range of 13±1 were selected for dentoalveolar change assessment. Two dental models were prepared from each subject one at the start of the investigation and one at the 4 years follow up; photographs of each model were taken at the time. Inter-canine distance, anterior arch depth, arch shape index, anterior teeth width (6 anterior teeth), anterior arch circumference (ATSALD) were measured using AutoCAD 2004 software and digital caliper. Means and standard deviations were measured using Npar test analysis. Data were compared at 0 and 4 years and between two genders using Wilcoxon test (P<0.05).Results: The most prevalent changes in samples belonged to ATSALD (2.2mm increase) over the four years. The least changes were detected in arch shape index. Anterior arch circumference and ATSALD were the dominant changes in boys and girls, respectively.Conclusion: During this critical growth period, anterior crowding of mandibular teeth increases in both boys and girls, while the inter-canine distance and arch shape index decrease.
Fahimeh Akhlaghi; Elahe Vahid Dastjerdie; Payam Ghahari
Abstract
Introduction: Despite a substantial body of literature refuting an association between third molar eruption and crowding of the lower anterior dentition, the issue continues to be controversial. This study sought to assess the correlation between angulations of impact mandibular third molars and anterior ...
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Introduction: Despite a substantial body of literature refuting an association between third molar eruption and crowding of the lower anterior dentition, the issue continues to be controversial. This study sought to assess the correlation between angulations of impact mandibular third molars and anterior crowding of the lower arch.Materials and methods: 127 patients were examined in this analytical-descriptive study. Clinical and paraclinical records were obtained to assess different impaction angulations and the rate of crowding. Patients with history of previous extractions, orthodontic treatment, Bolton discrepancy and skeletal orthodontic malformations were excluded. Kruskal —Wallis test was used for statistical analysis.Results: Of the 127 patients studied, mcsioangular impaction was observed in 61 patients (48%). This study showed no significant correlation between different angulations of mandibular third molar impaction and crowding (P>0.05).Conclusion: This study seems to confirm that the role of the lower third molars is not a significant factor in causing late anterior crowding.
Amirfarhang Miresmaeili; Aliasghar Soleimani
Abstract
Aim: Malocclusion may be caused by tooth size discrepancy and it is impossible to achieve perfect treatment results without regarding this etiologic factor. The aim of present study was to determining and comparing the mesiodistal width of permanent teeth in normal occlusion group and patients with class ...
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Aim: Malocclusion may be caused by tooth size discrepancy and it is impossible to achieve perfect treatment results without regarding this etiologic factor. The aim of present study was to determining and comparing the mesiodistal width of permanent teeth in normal occlusion group and patients with class 1 crowding malocclusion in Hamedan.
Material and Method: Based on Andrews normal occlusion criteria among 3335 students of Hamedan pre-university schools 32 persons were selected as normal group. In matched sex and range of age , 32 patients with class 1 crowding malocclusion were selected from a private office . Orthodontic dental casts of all samples were prepared. Mesiodistal width of all teeth (except 2nd molars), overbite, over-jet and Bolton indices were measured 3 times. Student t test and Mann whiteny u test were used for analysis.
Results: In crowding group the mesiodistal width of all teeth except for the first molars, were significantly greater than normal group specially in upper lateral incisors and lower premolars. Maxillary tooth material was 5.3 millimeter (p=0.0005) and mandibular tooth material was 5.4 millimeter (p=0.0036) greater in crowding patients. In crowding patients, overjet was significantly less and overbite was significantly more than normal group (p=0.0001) There was not significant difference in Bolton index between 2 groups.
Conclusion: It seems there is more crowding tendency in cases with large teeth. According to results. Bolton discrepancy (tooth size discrepancy) cannot be considered as a frequent factor in developing class 1 crowding. 2006; 1: 66 - 69)
Nasrin Farhadian; Amir H. Momeni
Abstract
Aim: Everyday because of developing new materials and techniques, more adults become interested in orthodontic treatments. Soft positioner and its new generation in the name of Invisalign System is an example. The present case report was designed to study the effects of soft elastic foils as serial aligners ...
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Aim: Everyday because of developing new materials and techniques, more adults become interested in orthodontic treatments. Soft positioner and its new generation in the name of Invisalign System is an example. The present case report was designed to study the effects of soft elastic foils as serial aligners on treat-ing the mild to moderate crowding.Materials and Method: Three teenage patients with crowding not more than 6 millimeters were select-ed. After the preparation of orthodontic diagnostic records and filling the periodontal chart, manual teeth setup was carried out on working casts with a maximum 0.5 millimeter displacement. Aligners were made up of bioplast foils. The appliance was worn by patient full time for at least 2 weeks. Then the new one was made and this procedure was continued until complete tooth alignment. The last aligner was used as retainer for three months later. These variables were evaluated after treatment : dental alignment , over jet . overbite, inclination of upper & lower incisors, lips relation to E line, mandibular plan angle, clicking in TMJ, periodontal status and tooth pain. Active treatment period lasted between 3-5 months.Results: Anterior crowding was completely corrected in all patients. Protrusion of upper & lower incisors were seen in lateral cephalograms. Overbite, mandibular plan angle and lips relation to E line did not change. Improvement of periodontal status were recorded in all patients. Low to moderate toothache was reported during the first 2 days .Conclusion: Mild to moderate crowding could be corrected successfully with soft elastic foils (Serial Aligners) without deleterious effects on TMJ and periodontium however manual tooth setup was time consuming. (IJO 2006; 1: 75 - 78)
Nasrin Farhadian; Amir H. Momeni
Abstract
Aim: Everyday because of developing new materials and techniques, more adults become interested in orthodontic treatments. Soft positioner and its new generation in the name of Invisalign System is an example. The present case report was designed to study the effects of soft elastic foils as serial aligners ...
Read More
Aim: Everyday because of developing new materials and techniques, more adults become interested in orthodontic treatments. Soft positioner and its new generation in the name of Invisalign System is an example. The present case report was designed to study the effects of soft elastic foils as serial aligners on treat-ing the mild to moderate crowding.
Materials and Method: Three teenage patients with crowding not more than 6 millimeters were select-ed. After the preparation of orthodontic diagnostic records and filling the periodontal chart, manual teeth setup was carried out on working casts with a maximum 0.5 millimeter displacement. Aligners were made up of bioplast foils. The appliance was worn by patient full time for at least 2 weeks. Then the new one was made and this procedure was continued until complete tooth alignment. The last aligner was used as retainer for three months later. These variables were evaluated after treatment : dental alignment , over jet . overbite, inclination of upper & lower incisors, lips relation to E line, mandibular plan angle, clicking in TMJ, periodontal status and tooth pain. Active treatment period lasted between 3-5 months.
Results: Anterior crowding was completely corrected in all patients. Protrusion of upper & lower incisors were seen in lateral cephalograms. Overbite, mandibular plan angle and lips relation to E line did not change. Improvement of periodontal status were recorded in all patients. Low to moderate toothache was reported during the first 2 days .
Conclusion: Mild to moderate crowding could be corrected successfully with soft elastic foils (Serial Aligners) without deleterious effects on TMJ and periodontium however manual tooth setup was time consuming. (IJO 2006; 1: 75 - 78)
