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Prevalence of malocclusion in relation to development of the dentition; an epidemiological study of danish school children
after orthodontic treatment was started. The germ was rr:pln.ntetl, i11~ RIOI cIt>-. veloped, and the toot.h erupted in due time. These rcplnnted locth w(~t’~:still functioning 23 and 30 years, respectively, a Rer replant&ion. Three cases of functional treatment in t,he deciduous dentition are also prcsented. Two of the patients had prenormal occlusion, probably of the pseudo type, at 3 and 4 years of age. The third patient had a unilateral posterior and anterior cross-bite at the age of 3 years. Two of these cases were treated in :3 months by means of retractors. In the other case a removable inclined plane wa.s used. The latter appliance is usually named after Oppenheim (1936), but And&en probably originated this plane in 1932; the first ones were rnadc of vulcanite but these have been replaced by acrylic ones? shaped and constructed in different ways as needed.
Prevalence of Malocclusion an Epidemiological Study
in Relation to Development of Danish School Children
of the Dentition;
Sven Helm Acta
Odont.
Soand.
20:
Supp.
58, 1970
The material comprised 1,895 boys and 1,947 girls, 7 to 18 years of age, who made up more than 97 percent of the total population of school children in an area in Northern Zealand, Denmark, during the 1965-66 winter and spring terms. No major sex difference was found for the sagittal anomalies (distal and mesial molar occlusion and extreme maxillary and mandibular overjet). However, extreme maxillary overjet showed a tendency to be more common among the boys. In the course of development, both sexes exhibited a decrease in frequency of distal molar occlusion and an increase in frequency of mesial molar occlusion. Among the vertical anomalies, a marked sex difference was found with respect to deep-bite, which was more common in the boys. The frequencies of front open-bite were fairly alike in both sexes. Lateral open-bite was obsemed in only a few children. The frequencies of transverse anomalies exhibited certain sex differences. Cross-bite was more common among the girls than among the boys. In both sexes an association was found between unilateral cross-bite and displacement of the mandibular midline in relation to that of the maxilla. The frequency of crossbite changed but little in the course of development. This applies also to the combination of unilateral cross-bite and midline displacement and to the crossbites which occurred unilaterally or bilaterally in the canine-premolar segment as well as in the molar segment. On the other ha3ld, the frequency of deep overbite increased considerably. Space anomalies exhibited marked sex differences. Crowding in the maxilla was more common among the girls than among the boys, Spacing in both jaws showed a systematic tendency to occur more often in the boys than in the girls.
Prevalence of Malocclusion an Epidemiological Study
in Relation to Development of Danish School Children
of the Dentition;
Sven Helm Acta
Odont.
Soand.
20:
Supp.
58, 1970
The material comprised 1,895 boys and 1,947 girls, 7 to 18 years of age, who made up more than 97 percent of the total population of school children in an area in Northern Zealand, Denmark, during the 1965-66 winter and spring terms. No major sex difference was found for the sagittal anomalies (distal and mesial molar occlusion and extreme maxillary and mandibular overjet). However, extreme maxillary overjet showed a tendency to be more common among the boys. In the course of development, both sexes exhibited a decrease in frequency of distal molar occlusion and an increase in frequency of mesial molar occlusion. Among the vertical anomalies, a marked sex difference was found with respect to deep-bite, which was more common in the boys. The frequencies of front open-bite were fairly alike in both sexes. Lateral open-bite was obsemed in only a few children. The frequencies of transverse anomalies exhibited certain sex differences. Cross-bite was more common among the girls than among the boys. In both sexes an association was found between unilateral cross-bite and displacement of the mandibular midline in relation to that of the maxilla. The frequency of crossbite changed but little in the course of development. This applies also to the combination of unilateral cross-bite and midline displacement and to the crossbites which occurred unilaterally or bilaterally in the canine-premolar segment as well as in the molar segment. On the other ha3ld, the frequency of deep overbite increased considerably. Space anomalies exhibited marked sex differences. Crowding in the maxilla was more common among the girls than among the boys, Spacing in both jaws showed a systematic tendency to occur more often in the boys than in the girls.