@article{oai:mdu.repo.nii.ac.jp:00001341,
 author = {恩田, 千爾},
 issue = {3},
 journal = {松本歯学},
 month = {Dec},
 note = {application/pdf, An anomaly of a tooth is an aberration or deviation from the normal anatomic growth or development of the teeth. Biologically, malformation might be a more appropriate term. However, rare forms of teeth will be described here without regard to embryology. In regard to the character of the tooth, even a normal form seen in more than 50% of Japanese people can be a rare form for Caucasians, and a form that appears frequently on the first molar may be rare on the third molar. The tooth anomaly appears as a deviation from the normal size, number, site or arrangement. However, these can frequently co-exist with other anomalies. The following items were reviewed. 1. Anomalies of the crown: 1) Shavel-shaped incisor, 2) Linguocervical groove, 3) Lingual pit (foramen caecum), 4) Central cusp, 5) Cusplet on the marginal ridge (Tubelculum interstiale), 6) Absence of the central groove, 7) Carabelli tubercle, 8) Protostylid, 9) 6th cusp, 10) 7th cusp, 11) Dryopithecus pattern. 2. Anomalies of the root: 1) Double-rooted incisor, 2) Double-rooted mandibular canine, 3) Number of the root of the maxillary premolar, 5) Mesial groove on the root of the mandibular premolar, 5) Three-rooted mandibular molar, 6) Gutter-shaped root, 7) Cervical enamel projection, 8) Enamel pearl, 9) Dilaceration and flexion.},
 pages = {185--200},
 title = {歯牙形態の異常},
 volume = {11},
 year = {1985}
}