Klinefelter syndrome

Overview

Board takeaway: Assess taurodont root and pulp anatomy before pulp therapy or extraction, and adapt explanations to language and learning needs.

How does Klinefelter syndrome affect dental management?

• Before pulp therapy or extraction: obtain radiographs. Taurodont pulps are large, furcations are deep, and canal orifices may lie near the apex.
• Pulp therapy: deep canal orifices can be difficult to locate, making treatment technically harder.
• Extraction: review actual root number, shape, divergence, and neighboring structures. Taurodontism does not reliably make an extraction easy.
• Communication and history: tailor explanations to language and learning needs; review endocrine treatment.

Exam pearl

What is Klinefelter syndrome?

A sex chromosome condition in males involving an additional X chromosome, often associated with testicular insufficiency and variable learning or language difficulties.

What are the main systemic features of Klinefelter syndrome?

• Genetics: 47,XXY; the most common sex chromosome aneuploidy in males (~1 in 600); nondisjunction, risk rises with maternal age
• Endocrine features: Tall stature with long legs, small firm testes, hypergonadotropic hypogonadism, gynecomastia, infertility
• Development: Speech, language and learning difficulties; often diagnosed at puberty or not at all
• Treatment: Endocrinology may use testosterone replacement for hypogonadism; timing and need depend on the individual

What oral findings occur in Klinefelter syndrome?

• Taurodontism (enlarged pulp chambers, apically displaced furcations), mostly in molars
• Tooth dimensions and root morphology can vary; assess the individual radiograph rather than assuming all roots are long

For Klinefelter syndrome, which other conditions are associated with taurodontism?

• Down syndrome
• Ectodermal dysplasia
• Tricho-dento-osseous syndrome
• Amelogenesis imperfecta: hypomaturation–hypoplastic type
• Other X chromosome aneuploidies

Sources

• Supplemental systemic features: MedlinePlus Genetics: klinefelter syndrome
• Supplemental study guide: Pediatric Dental Study Guide: Klinefelter Syndrome
• Management of Dental Patients with Special Health Care Needs
• Pulp Therapy for Primary and Immature Permanent Teeth: Indications and Objectives