Medical ConditionsCraniofacial & dental genetics: Dentinogenesis imperfecta
Medical ConditionsCraniofacial & dental genetics: Dentinogenesis imperfecta
Dentinogenesis imperfecta
Also called: DI; hereditary opalescent dentin
Overview
Board takeaway: Protect teeth from rapid wear. This inherited dentin disorder causes opalescent, gray-brown or amber teeth; enamel chips away and exposes soft dentin. It may occur with osteogenesis imperfecta.
How does Dentinogenesis imperfecta affect dental management?
- Primary molars: Early full-coverage restorations (stainless steel crowns) on primary molars to prevent wear
- Anterior and severe wear: Composite or crowns for anteriors; overlay dentures if wear is severe
- Pulp assessment: assess pulpal and periapical status even without visible caries.
- Endodontics: narrowed or obliterated canals can make treatment difficult; consider specialist input before deciding the tooth is untreatable.
- Extraction: Plan extractions from root shape, length, and remaining structure, using an atraumatic technique
- With osteogenesis imperfecta: plan safe positioning and gentle handling.
- Antiresorptive treatment: if osteogenesis imperfecta is present, review treatment and coordinate invasive care with the medical team; drug exposure alone does not determine extraction eligibility.
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| Feature | Dentinogenesis imperfecta | Amelogenesis imperfecta |
|---|---|---|
| Primary tissue defect | Dentin; enamel chips off weakened support. | Enamel thickness, mineralization, or maturation. |
| Radiographic clue | Bulbous crowns, cervical constriction, short roots; usually obliterated pulps. | Thin or poorly mineralized enamel; some forms have taurodontism. |
| Important exception | Type III may have enlarged pulps or shell teeth. | Pulp shape is not invariably normal. |
| Dental priority | Protect against rapid wear; assess silent periapical disease. | Protect sensitivity and weak enamel; stage restorations through growth. |
Exam pearl
What is Dentinogenesis imperfecta?
An inherited disorder of dentin formation, caused mainly by DSPP gene variants (or type I collagen variants when part of osteogenesis imperfecta), producing discolored, weak teeth that wear quickly.
What are the main features of Dentinogenesis imperfecta?
- Inheritance: Autosomal dominant
- Shields type I: occurs with osteogenesis imperfecta (collagen defect)
- Type II: dentin only (hereditary opalescent dentin), both dentitions
- Type III: "Brandywine" isolate; shell teeth with large pulps
- Severity: Primary teeth are often more severely affected than permanent teeth
What oral findings occur in Dentinogenesis imperfecta?
- Amber, gray, or blue-brown opalescent teeth
- Enamel chips off the soft dentin, leading to rapid attrition
- Bulbous crowns with marked cervical constriction; short, thin roots
- Pulp chambers and canals progressively obliterated (type II); "shell teeth" (type III)
- Periapical radiolucencies may develop in teeth without caries
How do you distinguish Dentinogenesis imperfecta from amelogenesis imperfecta?
- Dentinogenesis imperfecta (DI): enamel chips off defective dentin; radiographs typically show bulbous crowns, short roots, and obliterated pulps. Type III can have enlarged pulps (shell teeth), as described in the Brandywine clinical study.
- Amelogenesis imperfecta (AI): enamel itself is the primary defect; some forms include taurodontism, so pulp shape is not always normal. MedlinePlus Genetics.
For Dentinogenesis imperfecta, what history suggests osteogenesis imperfecta?
- Clues: repeated fractures with little trauma, blue or gray sclera, hearing loss, joint laxity, and short stature.
- Before invasive care: coordinate with the medical team and ask about bisphosphonate therapy.