Article

Linear evaluation of the development of sagittal jaw relationship.

History of Science Department, University of Aarhus, Aarhus, Denmark
American Journal of Orthodontics 10/1985; 88(3):235-41. DOI: 10.1016/S0002-9416(85)90218-0
Source: PubMed

ABSTRACT In cephalometrics both angular and linear variables have been proposed in the analysis of sagittal jaw relationship and jaw position. Angular measurements can be erroneous as a result of changes in facial height, jaw inclination, and total jaw prognathism; linear variables can be affected by the inclination of the reference line. In the present article, a method of geometric correction of linear analysis of sagittal jaw relationship and jaw prognathism (based on a standardized occlusal plane) is described. The method is applied to radiographic material (from King's College Hospital, London) of 33 children who, at the age of 19, exhibited Class I occlusal patterns. While uncorrected linear measurement suggested stability of the sagittal jaw relationship from the age of 11 to 19 years, the geometrically corrected value demonstrated a marked reduction in sagittal jaw relationship. The method is developed further to demonstrate the increase in jaw prognathism measured as lined parameters with origin at point sella, the results illustrating again the advisability of correction of geometric errors.

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    ABSTRACT: Die Mglichkeit, das sagittale Verhltnis zwischen den maxillren und mandibulren apikalen Basen mit Hilfe des von dem Autor entwickelten Modells zu vermessen, ist getestet worden. Zur Untersuchung dienten laterale Fernrntgenaufnahmen von 30 kieferorthopdisch unbehandelten sieben- bis 15jhrigen Kindern, die irgendwelche dentoalveolren und/oder skelettalen Gebianomalien hatten. Als die Methode mit einigen konventionellen oder weiterentwicklelten Methoden verglichen wurde, ergab es sich, da die bereinstimmung zwischen der neuen und den lteren Methoden je nachdem erstarkte, als erkennbare Fehler der lteren Methoden bercksichtigt und eliminiert wurden. Aufgrund der Ergebnisse schien es begrndet zu sein, die neue Methode, die den sagittalen apikalen Unterschied in Form eines Tensors darstellt, fr zuverlssig zu halten.The mathematical model (Jrvinen) for measuring the sagittal difference between the maxillary and mandibular apical bases has been clinically tested. The material for this study consisted of 30 lateral skull radiographs of orthodontically untreated children (aged seven to 15 years) with different types of skeletal and/or dento-alveolar malocclusions. A comparison of the model with two conventional and two more developed methods to measure the sagittal apical base difference showed that the correlation between the new and the older methods increased as the errors of the older methods were eliminated. The results seemed to indicate that sagittal malocclusions could be accurately diagnosed by means of the model.On a valu la validit clinique du modle mathmatique (Jrvinen) pour mesurer la relation basale sagittale entre les mchoires suprieure et infrieure. Les matriaux de l'tude se sont composs des radiographies cphaliques latrales de 30 patients orthodontiques non-traits (sept 15 ans), caractriss par des malocclusions squelettiques et/ou dento-alveolaires. Une comparaison du modle mathmatique avec deux mthodes conventionnelles et deux mthodes avances pour dterminer la relation basale sagittale entre les mchoires a indiqu une corrlation croissante, aprs que les erreurs connues des mthodes archaques aient t elimines. Sur la base de cette observation le modle mathmatique semblait permettre de faire le diagnostic ponctuel des malocclusions sagittales.
    Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie 08/1989; 50(5):465-472. DOI:10.1007/BF02171181 · 0.82 Impact Factor
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    ABSTRACT: The mathematical model (Järvinen) for measuring the sagittal difference between the maxillary and mandibular apical bases has been clinically tested. The material for this study consisted of 30 lateral skull radiographs of orthodontically untreated children (aged seven to 15 years) with different types of skeletal and/or dento-alveolar malocclusions. A comparison of the model with two conventional and two more developed methods to measure the sagittal apical base difference showed that the correlation between the new and the older methods increased as the errors of the older methods were eliminated. The results seemed to indicate that sagittal malocclusions could be accurately diagnosed by means of the model.
    Fortschritte der Kieferorthopädie 11/1989; 50(5):465-72.