PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “PROGNATHISM”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 973 records · Page 54Linked to original sources
PubMed1995

[Postoperative evaluation in mandibular prognathism treated by bilateral sagittal split osteotomy].

The present study was undertaken to evaluate the postoperative relapse from the period of unwiring to 1 year postoperatively and its correlation to the amount of mandibular setback and change in vertical dimension after mandibular bilateral sagittal split osteotomy. Twenty-seven patients were evaluated cephalometrically by the time preoperatively, 6 weeks, 6 months and 1 year postoperatively. It was found that 1) the average amount of mandibular setback at pogonion point, 6 weeks postoperatively, is 7.6mm backward and 1.9mm downward, 2) the average amount of horizontal relapse at pogonion point, 6 months and 1 year postoperatively, are 1.9mm and 2.3mm respectively. 86% of the horizontal relapse, 1 year postoperatively, occurs in the first 6 months after removal of intermaxillary fixation, 3) the average amount of vertical relapse at pogonion point, 6 months and 1 year postoperatively, are 0.9mm and 1.1mm upward. 82% of the vertical relapse, 1 year postoperatively, occurs in the first 6 months after removal of intermaxillary fixation, 4) the amount of 1 year postoperatively horizontal relapse is significantly correlated both with the amount of horizontal mandibular set back and vertical downward change (r = 0.58, 0.67, p < 0.001), whereas the amount of vertical relapse is with the vertical downward change only, but horizontal setback isn't.

Adolescent↗
PubMed1994

Changes in hypopharyngeal airway space and in tongue and hyoid bone positions following the surgical correction of mandibular prognathism.

This study was aimed at measuring the changes in the hyoid bone position, tongue position, and hypopharyngeal airway space in subjects with mandibular setback osteotomies. Lateral cephalometric radiographs of 15 patients were taken preoperatively, 6 weeks postoperatively, and at the follow-up with a mean of 1.5 +/- 0.4 years. A significant decrease in the hypopharyngeal airway space following mandibular setback surgery was found (P < .01). This change sustained during the follow-up period. The hyoid bone moved down (P < .001), and the lower tongue point also moved down (P < .05) postoperatively. Results of the study suggest that narrowing of the hypopharyngeal airway space due to the posterior and inferior movement of the tongue can be permanent.

Airway Obstruction↗
PubMedDate not supplied

[The cephalometric characteristics of the facial skeleton and base of the skull in prognathic bite].

Lateral teleroentgenography was used to examine facial skeleton and skull base in 62 patients with progenic occlusion formed because of adenoids. Thirty-four subjects with similar occlusions but without nasopharyngeal diseases were examined for control. Specific features of the cerebral and facial segments of the skull associated with the presence of adenoids were detected, namely, reduced size of the anterior and posterior sections of skull base, increased inclination angle, reduced length of maxillary body base and of apical basis and the distal position of the maxilla, increase of the maxillary body anterior height and of the central segment of the face, excessive growth of mandibular body and particularly of its branch parallelled by its increased angle and anterior height of the face, disordered correlations between various parameters. The authors come to a conclusion that progenic occlusion formation in adenoids results from early synostosis of synchondroses at the skull base and from disharmonious development of the entire facial skeleton.

Adenoids↗
PubMed1984

Saddle angle and maxillary prognathism: a radiological analysis of the association between the NSAr and SNA angles.

In cephalometric radiography, two angles have been commonly used, the saddle angle (NSAr) and the SNA angle. The former has been regarded as the cranial base angle, the latter as an indicator of the antero-posterior relation of the maxilla to the cranial base. In this study, a sample of 138 lateral skull radiographs of untreated orthodontics patients aged 7-15 years and analysed. The sample consisted of Angle's Class I, Class II, and Class III malocclusion cases. Means and standard deviations of the NSAr and SNA angles and the S-N and S-Ar lines for different malocclusion groups were estimated, and for each malocclusion group, the model of linear regression (y = bx + a) between the SNA and NSAr angles was computed. The mean of the NSAr angle was significantly larger in the Class II malocclusion group than in the Class III malocclusion group (p less than 0.05). The computed regressions indicated that about 14-40 per cent of the variation of the SNA angle in different malocclusion groups and about 24 per cent in the whole sample could be explained by the variation of the NSAr angle. Because at least a part of the correlation between the NSAr and SNA angles had a topographical causation, the main cause of this topographical correlation probably being the rotation of the S-N plane, the SNA angle was regarded as an unreliable indicator, the use of which can lead to considerable errors.

Adolescent↗
PubMedDate not supplied

[Surgical correction of extreme prognathism].

Extreme anomalies of alveolar bone and occlusion of any degree may be corrected surgically to achieve a satisfactory occlusion and a largely corrected and normalised profile.

Humans↗