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An analysis of three mixed dentition analyses.

The accuracy of prediction of three mixed dentition analyses was compared. Hixon and Oldfather's method was found to be the most accurate. A simplified version of the analysis obviates referral to a table, allowing assessment of the size of the unerupted teeth prior to eruption of the lateral incisor.

Bicuspid↗

Measurements of cervical undercuts of human tooth crowns.

The dimensional factors of the cervical undercut of the human teeth were measured. The facial and lingual undercuts showed considerable deviations in depth, width, and inclination to the crown axis and the food stream. The proximal undercuts showed a uniform depth of 1 +/- 0.3 mm with some deviations in width and inclination.

Bicuspid↗

Crown size-arch space relationships during human prenatal dental development.

As shown in composite reconstructions made from optically-projected measurements of 10mu frontal maxillofacial sections of 20 histologically normal fetuses and embryos in the 70-255 mm CRL range, individual differences in relative tooth size and interdental spacing are evident by 10.5-11 weeks of gestation, and age-corrected crown-size correlations (r=0.40) approximate those in postnatal life. Despite an eight-fold increase in crown dimensions, interdental spacing remains approximately constant after 150 mm CRL, suggesting that the tooth organs or the periodontal membranes are able to maintain spacing, into the third trimester.

Dental Arch↗