Tooth-position, arch-size, and arch-shape in the primary dentition

Hung Huey Tsai

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Tooth positions and dental arch forms are related to the growth of the craniofacial complex. To determine the positions of primary teeth and size and shape of the primary dental arches, sixty dental casts of young children (thirty boys and thirty girls) with normal occlusions were examined. In all casts the coordinates of cusp tips of primary canines and molars, and mesial and distal line angles of primary canines and incisors were digitized. The computer-generated curves were made for the maxillary and mandibular arches using a polynomial model. The results show that there were three major cusp-to-fossa and one cusp-to-marginal ridge relations in primary molar intercuspation. On average, girl's dental arches were smaller than boy's dental arches. The mean curves of maxillary and mandibular arches were similar in posterior segments, but the curves of mandibular arches in anterior segments were gentler than those of maxillary arches.

Original languageEnglish
Pages (from-to)17-22
Number of pages6
JournalJournal of Dentistry for Children
Issue number1
Publication statusPublished - Jan 2001
Externally publishedYes


  • Dental arch shape
  • Normal occlusion
  • Primary teeth
  • Tooth positions

ASJC Scopus subject areas

  • General Dentistry


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