Abstract

No Abstract Available

Abstract

No Abstract Available.

Abstract

A five-year follow-up study was performed on 26 children treated for nasal obstruction by adenoidectomy, who exhibited a changed mode of breathing postoperatively. They were compared with a control group matched according to age and sex. Lateral skull radiographs were used to examine mandibular morphology. The mandibular outline was registered using 36 digitized points. This method of portraying growth changes provides a valuable complement to isolated measurements. The technique revealed a more anterior direction of symphyseal growth in the adenoidectomy group following surgery as well as some reversal of the initial tendency to a posterior rotation of the mandible.

Abstract

In order to categorize (classify) craniofacial forms, varying linear dimensional arrays from a series of pretreatment cephalographs (‘A’ records) were subjected to cluster analysis. The derived subgroups (clusters) not only showed inconsistencies in their component patients, but also their ‘nearest neighbors’, i.e. cases identified as being most similar to one another. This study, therefore, emphasized the need to devise more appropriate cephalometric appraisal techniques for patient categorization (diagnosis).

Abstract

The purpose of this study was to determine whether developmental interactions exist between the mesio-distal diameters of the first and second developing teeth in each of two morphologic tooth classes. The interactions were evaluated for the maxillary and mandibular incisors and premolars. Measurements were obtained on the dentitions of three contemporary samples from Iowa, Egypt and Northern Mexico.

The findings from this study indicate that developmental interactions are present in the mesio-distal diameters between the first and second developing teeth within the two morphologic tooth classes evaluated, namely incisors and premolars. In other words, the mesio-distal diameter of the first developing tooth significantly influences the size of the second developing tooth within the same morphologic class.

Abstract

Analysis of deep bite and open bite subjects demonstrates differences in the timing of growth of various vertical facial dimensions.

Abstract

The tracing error of the cephalometric reference point condylion was studied in two groups of children with the mean ages 11 and 13 years. Two lateral cephalograms of each subject were available. The first film had been taken according to the standard method with the teeth in habitual occlusion, and the other with the mouth open to maximum extent.

The condylion was registered on all films on two occasions with an interval of one month. The distance condylion-prognathion (mandibular length) was also recorded.

The tracing error was found to be significantly greater when the condylion was located on occlusion films as opposed to open mouth films. The greatest precision of an individual measurement of mandibular length was, therefore, achieved on open mouth films. For group means, however, there was no significant difference between occlusion and open mouth films.

Abstract

A comprehensive cephalometric comparison between unselected Chinese and Caucasian 12-year-old male children in natural head posture finds the intracranial reference planes to slope down more caudally in the Chinese. By superimposing on true vertical, the degree of prognathism in the Chinese becomes apparent. Significant intergroup differences are highlighted for both selected dentoskeletal and soft tissue profile variables.

Abstract

Fifty-six standardized lateral head radiographs of Kikuyu children, represented equally by sex and aged nine to 15 years, were evaluated to determine norms for six dentoskeletal angles. The mean values obtained for the measured variables in the two sexes were: SNA = 84.4°(±4.0°); SNB = 79.3° (±4.1°); ANB = ±5.1° (±2.0°); FMA = 34.0° (±5.1°); IMPA = 96.2° (±5.0°) and 1/1 = 111.6° (±7.7°). Angle SNB was found to be significantly larger in females. A comparison of the means of the cephalometric anglesfor the Kikuyu children with those of black American children demonstrated a steeper Frankfort-mandibular plane angle and a more acute lower incisor to mandibular plane angle in Kikuyu children. The Kikuyu children were also noted to have a more prognathic maxilla relative to the cranial base and mandible, a greater inclination of the lower incisors to mandibular plane and a more acute interincisal angle when compared to white children. The study emphasizes the need for use of group specific norms for orthodontic diagnosis and treatment planning.

Abstract

One orthodontist’s appreciation of the many contributors and contributions to the making of an orthodontist and the progress of the profession.

Abstract

No Abstract Available.