Tanaka-Johnston mixed dentition analysis for southern Chinese in Hong Kong.
OBJECTIVE
To compare the prediction of unerupted permanent canine and premolar size of a comparable sample size of southern Chinese population with that of the study of Tanaka and Johnston.


METHODS
Teeth on study casts of an unselected sample from a 12-year-old Hong Kong Oral Health Survey of 12-year-old children (n = 459; 295 males and 164 females) were measured in the mesiodistal dimension. A Chinese mixed dentition analysis based on the Tanaka and Johnston method was constructed with linear regression equations for prediction of the mesiodistal widths of unerupted canines and premolars.


RESULTS
Sexual dimorphism was evident between southern Chinese males and females in incisors, canines, and premolars in the mesiodistal dimension.


CONCLUSIONS
To predict the space (in mm) required for alignment of unerupted canine and premolars in southern Chinese children, halve the sum of the mesiodistal dimensions of the four mandibular incisors and add the respective constants for males (upper, 11.5; lower, 10.5) or females (upper, 11.0; lower, 10.0).
Ling
John Y K
JY
Wong
Ricky W K
RW
D001641:Bicuspid / Q000473:pathology; D002648:Child; D002681:China / Q000208:ethnology; D003481:Cuspid / Q000473:pathology; D003724:Dental Arch / Q000473:pathology; D003818:Dentition, Mixed; D005260:Female; D005544:Forecasting; D006723:Hong Kong; D006801:Humans; D007180:Incisor / Q000473:pathology; D008297:Male; D009811:Odontometry / Q000295:instrumentation / Q000379:methods*; D012727:Sex Characteristics; D019228:Tooth Crown / Q000473:pathology; D014097:Tooth, Unerupted / Q000473:pathology*