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At least 19 recordsLinked to original sources
PubMed1992

[Dento-facial structural characteristics in Angle Class II malocclusion associated with abnormal facial divergency].

Lateral cephalometric radiographs of 60 adult patients with Angle class 11 malocclusion associated with abnormal facial divergency were collected from the Orthodontic Department of the National Taiwan University Hospital. They were divided into a hyperdivergent group (35 cases) and a hypodivergent group (25 case), according to mandibular plane angle (SN-MP). The 19 landmarks on each cephalometric tracing were digitized into a computer, then computer-aided cephalometric analysis was performed to calculate the 17 skeletal measurements and 13 dentoalveolar measurements. The dento-facial structural characteristics of the hyperdivergent and hypodivergent groups were compared. It was found that the subjects of the hyperdivergent group revealed a greater tendency of divergency in the anterior cranial base plane, Frank-fort horizontal plane, palatal plane, occlusal plane, and mandibular plane. Hyperdivergent facial type, supposedly indicating an open bite or a tendency toward an open bite, has a longer lower anterior facial height, shorter posterior facial height, longer upper anterior and posterior dental height. While, the majority of dentofacial characteristics of the hypodivergent facial type observed in is study were directly opposite to those of the hyperdivergent facial type. The relationships of incisor overbite depth and other skeletal and dentoalveolar parameters were illustrated by Pearson's correlation coefficient and stepwise multiple regression analysis by means of the SPSS/PC statistic program. With the incisor overbite depth as the dependent variable, the independent variables included on the regression analysis were the 10 items of skeletal and dentoalveolar parameters. The compared parameters showed a statistically significant correlation with the incisor overbite depth (P < 0.001). By the stepwise method, the variables included on the regression equation were (1) N-Go-Gn, (2) A-Gn-Ar, (3) N-Ans/ans-Me, and (4) U1L1. The value of R square (R2) in the regression analysis was 0.543. It demonstrated that only a 54.3% variation in incisor overbite depth can be explained by variations in those skeletal and dentoalveolar variables.

Adult↗
PubMed1992

[Anomalies of the inclination of the occlusal plane: early treatment using indirect guide-planes--electromyographic response].

We discuss five cases of ANGLE's malocclusion Classes I, II or III that were rehabilitated basically by: restoration of masticatory function (previously pathological); the use of removable orthopaedic plates with indirect guideplanes. The patients (aged 6-15 years when treatment began) now have symmetrical balanced occlusion. Surface electromyography was used to study the function of the anterior temporal, surface masseter, deep masseter and anterior digastric muscles of 12 patients during rehabilitation of severe malocclusion. Electromyograms were obtained both with and without orthopaedic guideplanes installed. There were no significant differences as regards mean resting myoelectric activity. During maximum voluntary clenching in centric occlusion, the anterior temporal muscles were the most active, followed by the surface masseters. The activity of the anterior temporal muscles during clenching was significantly less (P < 0.01) with guideplanes than without. During lateral displacements, the non-working side anterior temporal muscle exhibited a significantly higher potential than the other muscles monitored, especially with guideplanes installed. The activity was lees with guideplanes during swallowing.

Adolescent↗
PubMed1992

Mandibular border movements and masticatory patterns before and after orthognathic surgery.

To study the effects of combined surgical-orthodontic treatment, recordings of functional and border movements were obtained before and after surgery for 16 patients with severe skeletal malocclusions. The tracings showed a clear difference in the functional adaptation to mandibular setback and mandibular advancement surgeries. Patients with a skeletal Class III malocclusion who had undergone mandibular setback surgery generally showed an increase in the range of border and masticatory movements postsurgically. Patients with a skeletal Class II malocclusion corrected by mandibular advancement showed a restricted range of motion immediately postoperatively. Even 12 months after surgery, their recordings did not completely approach presurgical values.

Adult↗
PubMed1979

Maxillary osteotomies.

In the past decade, biological studies on the maxilla have led to variations in established maxillary osteotomy techniques. Three of these surgical innovations are presented with illustrative case histories.

Adolescent↗
PubMed1992

[A method of cephalometric analysis].

In this paper, 220 children ranging from age 11 to 15 were selected. Each of them received a cephalometric roentgenographic examination. 153 cephalometric items from 13 types of methods which had been widely in use were studied through statistic analysis. By means of "t" test, several items which expressed little difference between the normal occlusion and the malocclusion were eliminated. By using of the cluster analysis we selected one item to represent the items which were with similar effect. Finally, 17 cephalometric items were pick out to provide references for clinical work.

Adolescent↗
PubMed1992

[Glossoplasty: hope and pre-orthodontic support?].

A sample of 30 children who were between 8 and 15 years old is used for this study. The first part, using a cephalometric study (with two analysis: Ricketts and Sassouni), of these children's facial type, try to explain what expected the orthodontist after a partial resection of the tongue before treatment. In a second part, dental and skeletal effects of this surgery are studied, during a short period (5 to 10 months) before the beginning of the orthodontic treatment. These results are discussed according to research works realized by different authors.

Adolescent↗
PubMed1992

Variations in occlusal and space characteristics in a series of 6-18-year olds, in Ilala District, Tanzania.

This study was carried out in Ilala District, Tanzania as part of a major oral health survey. The aim of the study was to investigate the variation in different occlusal and space characteristics among children and adolescents in different age group. A total of 698 children and adolescents aged 6-18 years were examined clinically. The subjects were categorized into three age groups, 6-9 years with early mixed dentition, 10-14 years with late mixed dentition and 15-18 years with permanent dentition. The examiners were calibrated before the survey and the agreement was satisfactory. Anteroposterior relationships of the dental arches were measured according to Angle's classification. Other occlusal and space variables included overjet, overbite, openbite, crossbite, crowding, spacing, and separate determination of diastema mediale. Most of the subjects in different age groups, 93-96%, had Angle's Class I molar occlusion. Large overjet (> 5 mm) occurred in 3-5% of the subjects. Deep bite (> 5 mm) was observed in about 2% of the children in all age groups. Anterior open bite was the most prevalent occlusal anomaly in all age groups, noted in 9-13% of the subjects. Transversal occlusal anomalies were rare. More than 33% of the subjects had spacing while less than 10% had crowding of the dentition. These results indicate that using the present criteria, most 6- to 18-year olds in Ilala district have optimal sagittal occlusion and a lot of spacing. The most common occlusal anomaly was anterior openbite.

Adolescent↗
PubMed1979

[Electromyographic studies of the oral region before and after treatment with the function regulator].

Electromyographic measurements of the activity of the lips were performed on 101 children with dental malocclusions. It was stated that the intensity of the tetanic activities depended on the type of malocclusion. On mouth closing the lower lip was in general more active than the upper lip. Electromyographic examinations before and after treatment with the function regulator showed a considerable decrease in muscular activity compared to the initial values. These results permit to conclude that the function regulator as a training tool in the oral vestibule exerts a beneficial effect on incorrect positions and parafunctions of the muscles of the lips.

Action Potentials↗