has part has part characteristic of inheres in has modifier Microdontia Tooth hypotrophy Decreased width of tooth Small teeth UMLS:C0240340 Small tooth Hypotrophic tooth Tooth hypoplasia Standard reference has means and standard deviations by gender [Moyers et al, 1976]. It is easy to measure the width of teeth, for which reason the definition of microdontia can be made with reference to the width of the tooth. However, microdontia means that the overall size of the tooth is decreased. In microdontia, the gaps between the teeth, particularly the anterior upper and lower teeth, are increased, creating diastemata. This should be assessed and coded separately. SNOMEDCT_US:32337007 Decreased size of tooth Underdeveloped tooth UMLS:C4280612 UMLS:C4280611 HP:0000691 Decreased size of the teeth, which can be defined as a mesiodistal tooth diameter (width) more than 2 SD below mean. Alternatively, an apparently decreased maximum width of tooth. Abnormal dental morphology abnormal decreased size calcareous tooth