Abstract

GOMEZ-DIAZ, O.; CARDENAS-BOCANEGRA, G.; GAGLIANO-CANESSA, L.  and  BARON-ESTRADA, O.I.. Small lower jaw bone síndrome: in search of a diagnostic tool. Cir. plást. iberolatinoam. [online]. 2015, vol.41, n.3, pp.259-269. ISSN 1989-2055.  https://dx.doi.org/10.4321/S0376-78922015000300006.

Our objective is determining normal lower jawbone size in the colombian population aged less than 7 years old and its correlation with the upper jaw, the base of the skull, height and weight. A cross-sectional study was carried out on 600 healthy patients aged 0 to 7 years, comparing sample weight and height to that of the general population. The following anthropometric measurements were taken: nasion-otobasion inferius, gnathion otobasion inferius, tragus-subnasale-tragus, tragus-pogonion-tragus and vertical overlap (overbite) and horizontal overlap (overjet); the mandibular index was also calculated (mandibular arch x overjet / mandibular arch). All measurements were related to each patient's weight and height. Normal distribution tables, correlation and growth curve were obtained. Mandibular maxillary growth had a logarithmic pattern during the first year of life and then became linear. Average horizontal overlap (dental overjet) was 2 mm (0 to 4 mm range of normality), having high correlation with mandibular index. Height had a very good correlation with the anthropometric measurements analysed here; this was not the case with weight and age. Greater mandibular growth speed compared to jaw growth and the base of the skull was not demonstrated. Expected airway improvement during the first year of life in micrognathia patients could be secondary to maxillary mandibular logarithmic growth and not to mandibular compensatory over growth (catch up).

Keywords : Dental overjet; Micrognathism; Mandibular growth.

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