National Center for Advancing and Translational Sciences Genetic and Rare Diseases Information Center, a program of the National Center for Advancing and Translational Sciences

Single upper central incisor



Other Names:
Solitary median maxillary central incisor; SMMCI; Fused incisors; Solitary median maxillary central incisor; SMMCI; Fused incisors; Single central maxillary incisor; Solitary median maxillary central incisor syndrome; Incisors fused See More
Categories:

This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

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Medical Terms Other Names
Learn More:
HPO ID
30%-79% of people have these symptoms
Holoprosencephaly 0001360
5%-29% of people have these symptoms
Anophthalmia
Absence of eyeballs
Failure of development of eyeball
Missing eyeball
No eyeball
[ more ]
0000528
Anosmia
Lost smell
0000458
Coloboma
Notched pupil
0000589
Cyclopia
Cyclops eye
Single central eye
[ more ]
0009914
Microcephaly
Abnormally small skull
Decreased circumference of cranium
Decreased size of skull
Reduced head circumference
Small head circumference
[ more ]
0000252
Microphthalmia
Abnormally small eyeball
0000568
1%-4% of people have these symptoms
Abnormality of chromosome segregation 0002916
Abnormality of the nasopharynx 0001739
Choanal atresia
Blockage of the rear opening of the nasal cavity
Obstruction of the rear opening of the nasal cavity
[ more ]
0000453
Cleft upper lip
Harelip
0000204
Growth hormone deficiency 0000824
Hypotelorism
Abnormally close eyes
Closely spaced eyes
[ more ]
0000601
Intellectual disability, mild
Mental retardation, borderline-mild
Mild and nonprogressive mental retardation
Mild mental retardation
[ more ]
0001256
Midnasal stenosis 0010644
Prominent median palatal raphe
Prominent central ridge on roof of the mouth
0002708
Short stature
Decreased body height
Small stature
[ more ]
0004322
Single median maxillary incisor
Only one upper front tooth
0006315
Specific learning disability 0001328
Percent of people who have these symptoms is not available through HPO
Autosomal dominant inheritance 0000006
Pyriform aperture stenosis 0025011
Torus palatinus 0100789
Variable expressivity 0003828
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Last updated: 7/1/2020

Making a diagnosis for a genetic or rare disease can often be challenging. Healthcare professionals typically look at a person’s medical history, symptoms, physical exam, and laboratory test results in order to make a diagnosis. The following resources provide information relating to diagnosis and testing for this condition. If you have questions about getting a diagnosis, you should contact a healthcare professional.

Testing Resources

  • The Genetic Testing Registry (GTR) provides information about the genetic tests for this condition. The intended audience for the GTR is health care providers and researchers. Patients and consumers with specific questions about a genetic test should contact a health care provider or a genetics professional.

If you need medical advice, you can look for doctors or other healthcare professionals who have experience with this disease. You may find these specialists through advocacy organizations, clinical trials, or articles published in medical journals. You may also want to contact a university or tertiary medical center in your area, because these centers tend to see more complex cases and have the latest technology and treatments.

If you can’t find a specialist in your local area, try contacting national or international specialists. They may be able to refer you to someone they know through conferences or research efforts. Some specialists may be willing to consult with you or your local doctors over the phone or by email if you can't travel to them for care.

You can find more tips in our guide, How to Find a Disease Specialist. We also encourage you to explore the rest of this page to find resources that can help you find specialists.

Healthcare Resources


These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

Where to Start

  • Genetics Home Reference (GHR) contains information on Single upper central incisor. This website is maintained by the National Library of Medicine.

In-Depth Information

  • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
  • Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Single upper central incisor. Click on the link to view a sample search on this topic.

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