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An Analysis of the Skeletal Relationships in a Group of Young People with Hypodontia

Department of Child Dental Health, Newcastle Dental School, Framlington Place, Newcastle upon Tyne NE2 4BW, UK

R. S. Hobson.

Abstract

The objective of this investigation was to examine the dentofacial features of a group of patients with hypodontia, in particular assessing whether cephalometric analysis confirmed the clinical assumption of a reduced lower face height, and to determine the relationship of these facial features with different numbers of missing teeth. It took the form of a cephalometric study, undertaken in a dedicated Dental Hospital clinic for patients with hypodontia. The study group comprised 59 patients seen on the Hypodontia Clinic: 32 females, 27 males, mean age 13•1 ± 3•1 years (range 6–23 years). The average number of missing teeth was 7 (SD 5), ranging from 1 to 21. The mean SNA, SNB, and MMA angles were within normal limits, but there was a statistically significant reduction in the MMA when more than one tooth type was missing (P = 0•007) and the ANB angle decreased as the number of missing tooth types increased (P = 0•034). The mean values for the whole sample were within the normal range and did not demonstrate any feature specific to the group, but patients with more severe hypodontia showed tendencies to a Class III skeletal relationship and a reduced maxillary-mandibular planes angle.

Key words: Hypodontia, Cephalometric analysis.