Korean J Orthod.  1982 Jun;12(1):21-26.

A study on relations between facial skeletal patterns and dental occlusion

• Chang YI

Abstract

This study was undertaken to document relations between facial skeletal pattern and dental occlusion. The data in this study were collected from pretreatment cephalometric radiographs and study models of patients' records present in the files of Orthodontic Depattment, Seoul National University Hospital. Patients were selected on the basis of a mandibular plane-sella nasion angle equal to or greater than 38degrees (high SN-MP angle) or equal to or less than 26degrees (low SN-MP angle). patients in the mixed dentition and with missing permanent teeth were excluded for ease of assessing tooth size/arch circumferecne relationships and then 30 high SN-MP and 11 low SN-MP patients were selected among them. The mean age of these two groups of patients was high SN-MP, 12.8 +/- 1.23 years and low SN-MP, 13.0 +/- 1.48 years. The following conclusions were obtained. 1. In the maxilla and mandible the mean tooth size of high SN-MP patients was nearlly identical to the low SN-M patients. 2. The mean maxillary arch circumference was increased in low SN-MP group compared with high SN-MP group and a smilar, but smaller, mean increase was present in mandible. 3. The difference between the mean maxillary circumference required and the mean maillary circumference present ranged from -4.8mm SN-MP group to -1.3mm in the the low SN-MP group. A small range of means occurred in the mandible (high SN-MP: -4.0mm to low SN-MP: -1.8mm). 4. In the maxilla and mandible the mean arch length was nearly idntical in the high and low SN-MP groups. 5. The mean incisor inclination was increased as the SN-MP angle decreased in the maxilla and mandibile. 6. The mean distance of the maxillary first molar from anterior border of the pterygomaxillary fissure was nearly similar between high and low groups. 7. The mean mandibular intermolar width was increased from high SN-MP to low SN-MP patients.

MeSH Terms

Dental Occlusion*
Dentition, Mixed
Humans
Incisor
Mandible
Maxilla
Molar
Seoul
Tooth