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Evaluation of anterior-posterior and vertical skeletal change vs. dental change in rapid palatal expansion cases as studied by lateral cephalograms
VoZume Number
Reviews and abstracts
60 4
419
> error. Thus, as expected, environmental factors are relatively more important sources of variability between siblings than between twins. (This work was supported in part by NIH Dental Research Training Grant DEDOOO8-13.)
Abstracts of papers presented before the Research Section of the American Association of Orthodontists, Boston, Mass., April 6, 1970 Evaluation of Anterior-Posterior and Vertical Sk&M Charqe in Rapid Palatal Expansion Cases as Studied Lateral Cephalogramr
Albert Fairleigh
G. Byrusn, Jr., D.D.S. Dickinson University,
Change by
vs. Dentui
Teaneclc, N. J.
Thirty cases treated with palatal expansion appliances were examined. They involved Class I, II, and III malocclusions. Roth sexes were represented, and the patients ranged in age from 8 to 14 years. Lateral cephalograms were taken at the initiation of treatment and at the end of stabilization of treatment. Time of active expansion of the appliance was 3 weeks ; thus, growth was eliminated as a factor. Superimposition of pretreatment and posttreatment cephalograph tracings was made on SN. The use of cephalograms and fined points of reference revealed angular and linear changes of the maxilla and their relation to the patient’s occlusion, the maxillary dental changes and their relation to the occlusion, and the relation of the maxilla and maxillary teeth to one another. The data were subjected to the following statistical tests: (1) mean, (2) standard error of the mean, (3) the “t” test of significance at the 0.01 level, (4) Pearson coefficient of correlation. At the end of stabilization of midpalatal expansion, the maxilla had moved inferiorly a significant amount and the maxillary first molar was carried with it. The maxillary first molar exhibited only slight extrusion. Total facial height was influenced by the inferior positioning of the maxilla and its dental structures and an increase in the mandibular plane angle. The upper facial height increase was a result of the repositioning of the maxilla. The lower facial height increase was due to the repositioning of the maxilla and associated teeth and an increase in the mandibular plane angle as a result of the anterior border of the mandible being positioned posteriorly. This resultant shift of the mandible caused an opening of the bite. The palatal plane showed very little change as the maxilla moved inferiorly uniformly. There was only slight anterior movement of the maxilla.
Reviews and abstracts
60 4
419
> error. Thus, as expected, environmental factors are relatively more important sources of variability between siblings than between twins. (This work was supported in part by NIH Dental Research Training Grant DEDOOO8-13.)
Abstracts of papers presented before the Research Section of the American Association of Orthodontists, Boston, Mass., April 6, 1970 Evaluation of Anterior-Posterior and Vertical Sk&M Charqe in Rapid Palatal Expansion Cases as Studied Lateral Cephalogramr
Albert Fairleigh
G. Byrusn, Jr., D.D.S. Dickinson University,
Change by
vs. Dentui
Teaneclc, N. J.
Thirty cases treated with palatal expansion appliances were examined. They involved Class I, II, and III malocclusions. Roth sexes were represented, and the patients ranged in age from 8 to 14 years. Lateral cephalograms were taken at the initiation of treatment and at the end of stabilization of treatment. Time of active expansion of the appliance was 3 weeks ; thus, growth was eliminated as a factor. Superimposition of pretreatment and posttreatment cephalograph tracings was made on SN. The use of cephalograms and fined points of reference revealed angular and linear changes of the maxilla and their relation to the patient’s occlusion, the maxillary dental changes and their relation to the occlusion, and the relation of the maxilla and maxillary teeth to one another. The data were subjected to the following statistical tests: (1) mean, (2) standard error of the mean, (3) the “t” test of significance at the 0.01 level, (4) Pearson coefficient of correlation. At the end of stabilization of midpalatal expansion, the maxilla had moved inferiorly a significant amount and the maxillary first molar was carried with it. The maxillary first molar exhibited only slight extrusion. Total facial height was influenced by the inferior positioning of the maxilla and its dental structures and an increase in the mandibular plane angle. The upper facial height increase was a result of the repositioning of the maxilla. The lower facial height increase was due to the repositioning of the maxilla and associated teeth and an increase in the mandibular plane angle as a result of the anterior border of the mandible being positioned posteriorly. This resultant shift of the mandible caused an opening of the bite. The palatal plane showed very little change as the maxilla moved inferiorly uniformly. There was only slight anterior movement of the maxilla.