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West Indian med. j ; 14(2): 124, June 1965.
Artigo em Inglês | MedCarib | ID: med-7347

RESUMO

The lateral cephalometric X-ray makes possible the derivation of accurate height and depth dimensions of the living face. However, the postero-anterior or frontal film will not yield similar data for widths. Three years ago a method was developed that permits the measurement of the maxilla at two horizontal levels, viz., at the circumference of the tooth arch and that of the tips of the tooth roots (the apical base). This makes possible the longitudinal study of the two areas in the third plane. The comparison of measurements taken from plaster casts and x-rays of the same individuals has proved its accuracy. Teeth have long been equated with the skeleton, i.e., with the jaws, yet efforts to find correlations between the dimensions of the dental arch and those of the maxilla have invariably failed. The orthodontist has also failed in his efforts to effect changes in the maxilla at the level of the apical base by manipulation of the crowns of the teeth. There has developed from these failures a general pessimism regarding the efficacy of arch expansion and lenghtening in orthodontics with the result that many teeth have been extracted. Growth curves have revealed that the two areas and their perimeters behave differently. The dental arch and apical base areas increase similarly to other facial growth curves, as does the perimeter of the apical base. The perimeter of the dental arch flattens at the 10th year in the female and at 12 years in the male. It remains stable until the 16th tear and then begins to decline. From these findings it is proposed that the teeth are under dual influences: their crowns being controlled by the gut and their root ends by the skeleton (AU)


Assuntos
Humanos , Periodontite Periapical , Raiz Dentária
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