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Results for “Malocclusion, Angle Class I”

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At least 19 recordsLinked to original sources
PubMed1982

Postpharyngeal lymphoid tissue in Angle Class I and Class II malocclusions.

Opinions differ with regard to the relationship of adenoids and type of malocclusion. To study this possible relationship, xeroradiographic lateral cephalograms were made of eighty Class I (Angle) and sixty-four Class II, Division 1 (Angle) malocclusions to obtain reliable measures of the epipharyngeal lymphoid tissue, the nasopharyngeal airway, the nasopharynx, and certain cephalometric landmarks. Xeroradiographic cephalograms provide superior visualization with edge-enhancement effect for both soft and hard tissues. Electronic digitization and a comprehensive computer analysis were used to assess the head films. Significant differences were found for some of the linear and angular cephalometric criteria between the two malocclusion categories. A sexual dimorphism was observed. These skeletal and dental differences were anticipated in this mixed malocclusion sample, as prior cephalometric studies which compare different classes of malocclusion have shown. Airway space did not appear to vary with the type of malocclusion. Some low-level correlations were found between the size of the nasopharyngeal area and certain skeletal characteristics. These correlations depended on both the malocclusion type and the sex of the individual. The lateral, two-dimensional cephalogram does not seem to offer satisfactory information relating the nasopharyngeal area to Class I or to Class II, Division 1 malocclusions.

Cephalometry↗
PubMed2004

Factors affecting the duration of orthodontic treatment in children. A retrospective study.

Factors that affect the duration of orthodontic treatment in children were studied from treatment records, dental and cephalic radiographs, and dental plaster casts of a random sample of 93 orthodontic patients who were treated during the period 1983-1994 and were aged 7 to 13 years at the start of treatment. The duration of treatment and 15 variables describing the patients' age at the start of treatment, the gender distribution of the patients, the progress of treatment, the occlusal status, skeletal deviations, malocclusion classes (Angle), and patients' age at the start of treatment, were recorded. The data were analysed by means of analysis of variance, chi-square test, and multiple regression analysis. The mean treatment time was 2.9 years. The regression analysis revealed that the variations in sex variables, malocclusion class, patients' age at the start of treatment, type of appliances used, number of appliances used, number of missed appointments, and main additional diagnosis explained about 41% of variation in treatment time. Treatment of Class I and Class II/1 patients with combinations of fixed and removable appliances, early start, high number of appliances used, and high number of missed appointments prolonged the duration of treatment. Treatment of Class I patients with frontal crossbite was relatively short.

Adolescent↗
PubMed1983

Lower cranial height vs craniofacial dimensions in Angle Class II malocclusion.

From the serial sample of the Burlington Growth Centre, 68 children with Angle Class II malocclusion were contrasted with 148 children with Class I occlusion. Body height, cranial height, cranial base flexure and jaw position relative to the cranium were compared at ages 8, 12 and 16 years. In the Class II groups, the cranial base angle was significantly (P less than .05) larger, upper cranial height was slightly larger, lower cranial height was slightly smaller, the maxilla was slightly more posterior to Sella, and the mandible was significantly more posterior. Between ages 8 and 16 years, lower cranial height increased and cranial base angle decreased, with a strong negative correlation. Lower cranial height and the anterior position of the maxilla and mandible from Sella correlated significantly (P less than .01) with body height in Class I children, but in Class II only in boys 8 and 12 years of age. This lower correlation in Class II children was accounted for by those with a moderate to tall stature but disproportionately small lower cranial height. In Class II children the jaws, especially the mandible, had a more posterior position under the cranium, and there was a more open flexure of the cranial base and shorter lower cranial height. Correlation of stature with lower cranial height and with the anterior position of the jaws relative to the cranium was much lower in Class II children, especially in girls.

Adolescent↗