Rare Dermatology News

Disease Profile

Dentin dysplasia, type 1

Prevalence estimates on Rare Medical Network websites are calculated based on data available from numerous sources, including US and European government statistics, the NIH, Orphanet, and published epidemiologic studies. Rare disease population data is recognized to be highly variable, and based on a wide variety of source data and methodologies, so the prevalence data on this site should be assumed to be estimated and cannot be considered to be absolutely correct.

1-9 / 100 000

US Estimated

Europe Estimated

Age of onset






Autosomal dominant A pathogenic variant in only one gene copy in each cell is sufficient to cause an autosomal dominant disease.


Autosomal recessive Pathogenic variants in both copies of each gene of the chromosome are needed to cause an autosomal recessive disease and observe the mutant phenotype.


dominant X-linked dominant inheritance, sometimes referred to as X-linked dominance, is a mode of genetic inheritance by which a dominant gene is carried on the X chromosome.


recessive Pathogenic variants in both copies of a gene on the X chromosome cause an X-linked recessive disorder.


Mitochondrial or multigenic Mitochondrial genetic disorders can be caused by changes (mutations) in either the mitochondrial DNA or nuclear DNA that lead to dysfunction of the mitochondria and inadequate production of energy.

Multigenic or multifactor Inheritance involving many factors, of which at least one is genetic but none is of overwhelming importance, as in the causation of a disease by multiple genetic and environmental factors.


Not applicable


Other names (AKA)

Radicular dentin dysplasia; Rootless teeth; DD-I;


Congenital and Genetic Diseases; Mouth Diseases


The following summary is from Orphanet, a European reference portal for information on rare diseases and orphan drugs.

Orpha Number: 99789

Dentin dysplasia type I (DD-I) is a rare form of dentin dysplasia (DD, see this term) characterized by sharp conical short roots or rootless teeth.

Prevalence of DD-I is reported to be 1/100,000.

Clinical description
The condition affects both primary and permanent dentition. Signs of the condition are variable. In patients with DD-I, the teeth are generally unremarkable clinically with a normal shape and color. However, the roots appear sharp with conical, apical constrictions on radiography. The teeth are generally mobile, with frequent abscess formation and can be lost prematurely. Aberrant dentin formation can lead to partial or total pulp obliteration.

DD-I is caused by mutations in the DSPP gene (4q21.3) coding for dentin sialophosphoprotein, a precursor for dentin sialoprotein and dentin phosphoprotein which are involved in dentinogenesis.

Diagnostic methods
Since teeth in DD-I appear clinically normal, diagnosis is based on radiographic features (abnormal roots, pulp obliteration, partially obliterated crescent shaped pulp chamber and occasionally pulp stones). Molecular genetic testing can be used to confirm the diagnosis.

Differential diagnosis
Differential diagnoses include conditions that have overlapping clinical or radiographic features with DD such as those leading to early tooth loss: Kostmann syndrome, cyclic neutropenia, Chediak-Hegashi syndrome, Langerhans cell histiocytosis, Papillon-Lefèvre syndrome, hypophosphatasia, and vitamin D-resistant rickets (see these terms).

Genetic counseling
DD-I follows an autosomal dominant pattern of inheritance. There is therefore a 50% chance that a child born to an affected parent will have the condition.

Management and treatment
Appropriate care makes it possible to achieve good esthetic appearance and functional performance.

Prognosis depends primarily on the age of diagnosis and the quality of management.

Visit the Orphanet disease page for more resources.


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.

Medical Terms Other Names
Learn More:
5%-29% of people have these symptoms
Decreased width of tooth
Percent of people who have these symptoms is not available through HPO
Autosomal recessive inheritance
Dentinogenesis imperfecta limited to primary teeth
Obliteration of the pulp chamber
Periapical bone loss
Dark spot around tooth root on x-ray

Learn more

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.

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 Dentin dysplasia, type 1. Click on the link to view a sample search on this topic.