At a glance
- Cleidocranial dysplasia (CCD), formerly termed cleidocranial dysostosis, is a rare congenital skeletal dysplasia characterised by abnormal bone development and pronounced dental anomalies.
- Cleidocranial dysplasia is predominantly inherited in an autosomal dominant pattern, meaning a single copy of the altered gene in each cell is sufficient to express the phenotype.
- The dental presentation of cleidocranial dysplasia typically becomes conspicuous in early to mid-childhood, usually around six to eight years of age when the first primary teeth should shed.
- Establishing an accurate diagnosis requires thorough clinical examination paired with specialised radiographic assessment.
- The expression of cleidocranial dysplasia varies widely, even among individuals carrying the exact same genetic mutation within a single family.
Understanding Cleidocranial Dysplasia and Dental Anatomy
Cleidocranial dysplasia (CCD), formerly termed cleidocranial dysostosis, is a rare congenital skeletal dysplasia characterised by abnormal bone development and pronounced dental anomalies. In individuals with this condition, the primary skeletal hallmarks involve delayed closure of cranial sutures (the fibrous joints between skull bones), wide fontanelles, and hypoplasia or complete aplasia of the clavicles (underdeveloped or absent collarbones), which often permits hypermobility of the shoulders. However, the craniofacial and oral manifestations represent some of the most complex clinical challenges that patients encounter throughout childhood and adult life.
Dentally, cleidocranial dysplasia primarily disrupts the normal physiological process of tooth eruption and shedding. The primary dentition (deciduous or baby teeth) fails to resorb and exfoliate at the expected biological intervals. Concurrently, the underlying permanent succedaneous teeth (adult replacement teeth) remain impacted deep within the alveolar bone (jawbone). Furthermore, patients frequently develop multiple supernumerary teeth—extra tooth buds that form predominantly in the premolar and anterior maxillary regions. This overcrowding, combined with dense cortical bone and deficient cementum on tooth roots, creates an anatomical barrier that arrests spontaneous eruption.
Aetiology and Genetic Mechanisms
Cleidocranial dysplasia is predominantly inherited in an autosomal dominant pattern, meaning a single copy of the altered gene in each cell is sufficient to express the phenotype. The condition is caused by heterozygous pathogenic variants (mutations) in the *RUNX2* gene (also historically known as *CBFA1*), located on the short arm of chromosome 6 (6p21.1). The *RUNX2* gene provides critical instructions for producing a master transcription factor essential for osteoblast differentiation (bone-forming cell maturation) and skeletal morphogenesis. In roughly one-third of diagnosed individuals, the condition arises from a *de novo* (spontaneous) mutation with no prior family history.
In the oral cavity, the RUNX2 protein regulates the molecular signalling cascade that directs dental follicle remodelling, epithelial-mesenchymal interactions, and alveolar bone resorption above advancing tooth crowns. When RUNX2 function is reduced, the dental follicle fails to recruit osteoclasts (bone-resorbing cells) efficiently. Without this coordinated resorption of the overlying alveolar bone and deciduous roots, permanent teeth lack a pathway to erupt into the oral cavity. This molecular defect also permits the prolonged proliferation of the dental lamina, resulting in the development of successive waves of supernumerary teeth.
Clinical Presentation and Oral Manifestations
The dental presentation of cleidocranial dysplasia typically becomes conspicuous in early to mid-childhood, usually around six to eight years of age when the first primary teeth should shed. Parents and clinicians observe a prolonged retention of primary teeth, accompanied by severe failure of eruption of the permanent incisors and first molars. This gives the appearance of pseudo-anodontia (false absence of teeth), where the dental arches appear largely edentulous or populated only by diminutive, worn deciduous teeth, despite dozens of developed teeth being present within the jaws.
Craniofacial features often compound these dental issues. Patients frequently exhibit a broad, brachycephalic skull with frontal and parietal bossing (prominent forehead and sides of the head), hypertelorism (widely spaced eyes), and a depressed nasal bridge. The maxilla (upper jaw) is characteristically hypoplastic (underdeveloped) in both transverse and anteroposterior dimensions, whilst the mandible (lower jaw) grows to a relatively normal size. This discrepancy creates a high-arched, narrow palate, severe dental crowding, and a skeletal Class III malocclusion (an underbite or reverse articulation), often complicated by an anterior open bite.
Diagnostic Pathways: Imaging, CBCT, and Differential Diagnosis
Establishing an accurate diagnosis requires thorough clinical examination paired with specialised radiographic assessment. An initial screening begins with a panoramic radiograph (orthopantomogram or OPG), which typically reveals a striking 'cluster' or 'pebble stone' appearance of numerous impacted permanent and supernumerary teeth embedded within both jaws. However, modern cleidocranial dysplasia dental management relies on high-resolution Cone Beam Computed Tomography (CBCT). CBCT provides three-dimensional localisation of crown positions, root morphologies, developmental stages, and proximity to anatomical structures like the inferior alveolar nerve or maxillary sinus.
Differential diagnosis is vital to distinguish cleidocranial dysplasia from other conditions presenting with supernumerary teeth, delayed eruption, or clavicular defects. Clinicians must rule out Gardner syndrome (which features intestinal polyps, osteomas, and epidermal cysts), pyknodysostosis (characterised by osteosclerosis, short stature, and bone fragility), Yunis-Varon syndrome, and isolated primary failure of eruption (PFE). Confirmatory molecular genetic testing for *RUNX2* mutations is recommended to solidify the diagnosis, assist in genetic counselling for the family, and guide long-term systemic screening.
Phenotypic Variations and Clinical Categorisation
The expression of cleidocranial dysplasia varies widely, even among individuals carrying the exact same genetic mutation within a single family. Some patients display the classic skeletal triad of absent clavicles, cranial bossing, and massive hyperdontia (more than 10 to 15 extra teeth), whereas others manifest mild clavicular hypoplasia and only a few unerupted permanent teeth with no supernumeraries. Because of this phenotypic heterogeneity, clinical categorisation is often determined by the chronological stage of dental development and the vertical positioning of impacted teeth relative to the alveolar ridge.
Clinicians broadly categorise cases into early mixed dentition, late mixed dentition, and permanent dentition presentations. Early cases (under 8 years) usually have unresorbed deciduous roots and developing supernumerary tooth buds that have not fully calcified. Adolescent and adult presentations frequently exhibit dense, sclerotic jawbone, dilacerated (severely curved) roots on impacted adult teeth, and secondary dentigerous cysts surrounding the crowns of long-retained teeth. These anatomical categorisations dictate whether an interceptive surgical-orthodontic approach or a restorative-prosthodontic pathway is appropriate.
Treatment Approaches in Cleidocranial Dysplasia Dental Management
Managing cleidocranial dysplasia requires a coordinated, multidisciplinary team comprising paediatric dentists, oral and maxillofacial surgeons, orthodontists, and prosthodontists. There is no single universal protocol, but several established paradigms guide therapy. The traditional Toronto (or combined surgical-orthodontic) approach involves serial extractions of primary teeth, surgical exposure of permanent teeth, and active orthodontic traction to guide them into occlusion. In contrast, the Jerusalem approach advocates for early, radical removal of deciduous teeth and all supernumeraries under general anaesthetic, followed by surgical exposure of underlying permanent teeth without immediate traction, encouraging natural eruption.
Another recognised strategy is the Belfast-Hamburg approach, which uses staged surgical procedures timed with root maturation stages to bring anterior teeth into occlusion first, followed later by posterior segments. When patients present late in adulthood, or where severe root dilacerations and ankylosis (fusion of the tooth root to bone) prevent movement, full surgical-orthodontic rehabilitation may be impossible. In these scenarios, a prosthodontic approach is adopted, which includes retaining stable submerged teeth, extracting infected or cystic units, and fabricating overdentures, fixed bridgework, or zygomatic and standard dental implants.
Step-by-Step Surgical and Orthodontic Journey
The typical active management journey spans several years and involves carefully orchestrated surgical and orthodontic phases. The process begins around age 7 to 9, after permanent root development has initiated. Under general anaesthesia, the maxillofacial surgeon meticulously extracts the retained deciduous teeth and removes all identified supernumerary tooth buds. Special care is taken to preserve the thin overlying cortical bone and to distinguish normal permanent tooth germs from supernumeraries based on pre-operative three-dimensional CBCT mapping.
In the next phase, impacted permanent teeth that fail to erupt spontaneously undergo surgical exposure. The surgeon creates a conservative mucoperiosteal flap, clears the overlying bone around the anatomical crown (coronectomy of overlying bone), and bonds orthodontic brackets or eyelets equipped with small gold chains directly to the enamel. The soft tissue flap is then repositioned or closed (closed eruption technique). Following a short healing period, the orthodontist applies gentle, continuous directional forces via specialised archwires, cantilevers, or temporary anchorage devices (TADs) to guide the impacted teeth vertically into the dental arch over 18 to 36 months.
Postoperative Care, Recovery, and Healing Dynamics
Postoperative recovery following combined extraction and tooth exposure procedures requires structured supportive care. In the immediate 48 to 72 hours, patients experience moderate facial swelling, localised pain, and minor oozing from surgical sites. Analgesia is typically managed with scheduled paracetamol and non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, assuming no systemic contraindications exist. Patients are instructed to maintain a cool, soft-food diet and practice meticulous oral hygiene, avoiding direct brushing over surgical sutures for the first week.
Antiseptic mouthwashes, such as 0.12% chlorhexidine gluconate, are commonly prescribed twice daily to prevent surgical site infections without disturbing mechanical clots. Normal healing features gradual reduction in mucosal inflammation and mucosal epithelialisation within 10 to 14 days. However, healing of the deeper alveolar bone is noticeably slower in patients with cleidocranial dysplasia due to impaired osteoblast and osteoclast signalling. Orthodontists account for this by applying very light, continuous forces, as aggressive traction risks devitalising the tooth or inducing root resorption.
Potential Complications, Risks, and Red Flags
Several complications can arise during the prolonged treatment of cleidocranial dysplasia. The most significant risk is dental ankylosis, in which the periodontal ligament of an impacted tooth obliterates, fusing the root directly to the alveolar bone and making orthodontic movement impossible. Other risks include root resorption of neighbouring teeth, gingival recession around exposed crowns, devitalisation of teeth requiring endodontic therapy, and the formation of dentigerous cysts or odontogenic keratocysts around long-standing unerupted crowns.
Patients and parents must be educated on acute warning signs that demand urgent clinical evaluation. Red flags include sudden, severe facial swelling spreading towards the neck or floor of the mouth (which can compromise the airway), high fever, persistent numbness or altered sensation in the lower lip and chin (paresthesia of the inferior alveolar or mental nerve), or purulent drainage (pus) from surgical wounds. In regions where access to specialist craniofacial teams is limited, or in communities where habits like betel quid, paan, or gutka chewing are prevalent, underlying mucosal health must be rigorously monitored, as chemical trauma severely complicates surgical wound healing.
Evidence and further reading
International consensus among major clinical bodies—including the British Orthodontic Society, the American Association of Orthodontists, the American Academy of Paediatric Dentistry, and the International Association of Oral and Maxillofacial Surgeons—highlights that cleidocranial dysplasia dental management must be initiated early and guided by an interdisciplinary craniofacial team. Research published across leading peer-reviewed literature, such as the *International Journal of Oral and Maxillofacial Surgery*, the *American Journal of Orthodontics and Dentofacial Orthopedics*, and the *Journal of Craniofacial Surgery*, underscores that timely extraction of supernumeraries combined with surgical exposure and orthodontic traction yields predictable functional and aesthetic outcomes.
Long-term retrospective cohort studies confirm that whilst treatment often spans five or more years, preserving natural permanent dentition substantially maintains alveolar bone height and facial vertical dimension compared to late total clearance and complete dentures. Current guidelines from clinical genetics consortia also recommend early molecular testing for *RUNX2* and continuous surveillance for secondary complications, including middle ear effusion, scoliosis, and bone density deficiencies.
Questions patients ask us
- Why do baby teeth fail to fall out on their own in cleidocranial dysplasia?
- In cleidocranial dysplasia, a genetic alteration in the *RUNX2* gene impairs the normal cellular signalling needed for bone and root resorption. As a result, the body does not activate osteoclasts to dissolve the roots of baby teeth. Without natural root breakdown, the primary teeth remain firmly anchored in the jaw, preventing the adult teeth beneath from pushing through.
- At what age should dental treatment for cleidocranial dysplasia begin?
- Initial radiographic assessment typically begins around age 5 to 6. Active surgical and orthodontic intervention is usually timed around age 7 to 9, when the permanent incisor roots have developed at least one-half to two-thirds of their expected length. This developmental stage provides the physical anchor needed for successful orthodontic traction.
- What is a supernumerary tooth, and why must it be removed?
- A supernumerary tooth is an extra tooth bud that develops in addition to the normal 32 permanent teeth. In cleidocranial dysplasia, these extra teeth form physical obstructions directly over normal adult teeth. Maxillofacial surgeons remove them so that the rightful permanent teeth have an unblocked pathway to be guided into the mouth.
- Can adult teeth erupt naturally without surgery in this condition?
- Spontaneous eruption is exceptionally rare in cleidocranial dysplasia, particularly for the premolars and incisors. Because the jawbone above the teeth is unusually dense and lacks natural resorption pathways, minor surgical exposure combined with orthodontic brackets and traction is almost always required to bring impacted teeth into their functional positions.
- How long does the complete orthodontic and surgical process take?
- Because treatment involves multiple sequential steps—extracting baby teeth, removing extra teeth, exposing adult teeth, and slowly moving them through bone—the active dental journey typically takes between 3 to 6 years. Orthodontists deliberately use slow, gentle forces to protect the tooth roots and ensure healthy surrounding bone.
- What happens if cleidocranial dysplasia is diagnosed late in adulthood?
- When diagnosed in adulthood, unerupted teeth may be ankylosed (fused to bone), making orthodontic movement impractical. Management shifts towards a restorative approach: removing problematic or cystic teeth, preserving healthy asymptomatic teeth within the bone, and restoring function using overdentures, conventional bridges, or strategically placed dental implants.
- Are dental implants safe for individuals with cleidocranial dysplasia?
- Yes, dental implants can be successful in adults with cleidocranial dysplasia, provided adequate bone volume exists. However, because jawbone architecture can be altered and unerupted teeth may occupy implant sites, careful 3D planning using CBCT scans is essential. Bone grafting or zygomatic implants may occasionally be considered.
- Are there lifestyle or dietary habits that worsen oral outcomes in this condition?
- Poor oral hygiene increases the risk of gum inflammation around exposed teeth and orthodontic hardware. Additionally, habits common in certain regions, such as chewing paan, gutka, or tobacco, cause severe mucosal irritation and impair postoperative soft tissue healing. Maintaining strict plaque control and avoiding tobacco products are critical for surgical success.
When to see us
Get examined without waiting if any of the following applies to you:
- Facial swelling, fever or refusal to eat or drink in a child — seek same-day care
- Dental injury to a child's tooth, especially if it is displaced or knocked out
- A dark or discoloured tooth, or a lump on the gum above a tooth
Get a written plan and cost before you commit
If this is what you are dealing with, the next step is a consultation with radiographs — children's dentistry cases are seen by the specialist who handles that field. You get a written plan and staged cost before anything begins.
reception@dramitsharmahospital.comThis article is general education and does not replace an in-person examination, radiographs or a diagnosis by a qualified dentist.
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