Beckwith-Wiedemann Syndrome and Orthodontics UK

What is Beckwith-Wiedemann syndrome and how does it affect the mouth and jaws?

Beckwith-Wiedemann syndrome (BWS) is a congenital overgrowth condition caused by disruption of imprinted genes in the 11p15.5 region of chromosome 11, most often an epigenetic change (loss of methylation at KvDMR1) rather than a straightforward inherited mutation. It affects roughly 1 in 10,000 to 1 in 15,000 births. Common features include macrosomia (larger than average birth size), macroglossia, abdominal wall defects such as omphalocele, neonatal hypoglycaemia, ear creases or pits, and asymmetrical overgrowth of one side of the body (hemihyperplasia). Macroglossia is present in the large majority of children with BWS and is the feature with the most direct and lasting impact on orthodontic development. A tongue that is disproportionately large for the oral cavity pushes against the teeth and jaws from infancy, shaping the developing dentition and skeletal pattern years before any orthodontic assessment takes place.

How macroglossia shapes the developing bite

An enlarged tongue resting against the lower incisors and pressing outward against both arches produces a recognisable pattern of dental and skeletal change over time. Anterior open bite is common, as the tongue prevents the front teeth from meeting. Generalised spacing between the lower incisors, and sometimes the upper incisors, develops as the tongue pushes the teeth apart. Mandibular prognathism — a forward-positioned lower jaw — can develop because the tongue posture encourages excessive mandibular growth relative to the maxilla, producing a Class III skeletal tendency in some children. Anterior crossbite may accompany this pattern. The severity of these changes correlates with the degree of macroglossia and how early it was surgically addressed; children who have tongue reduction surgery in early childhood generally show less severe skeletal drift than those whose macroglossia goes unaddressed into the mixed dentition years.

Tongue reduction surgery and its timing

Not every child with BWS-associated macroglossia needs tongue reduction surgery — the decision depends on functional impact (feeding, speech, airway) and the degree of tongue protrusion, and is made by a specialist craniofacial or maxillofacial surgical team, often working alongside GOSH's dedicated macroglossia service or an equivalent regional centre. When surgery is indicated, it is typically performed in early childhood, commonly between around 12 months and 4 years of age, aiming to reduce tongue bulk and improve its resting position within the oral cavity before the permanent dentition begins to establish. Surgical technique varies (anterior wedge, central wedge, or combined reductions) depending on the specific shape of the tongue and functional goals. Timing matters for orthodontics: intervening before the mixed dentition stage gives the developing arches a better chance of settling into a more normal relationship without the ongoing distorting pressure of an oversized tongue, though surgery alone does not correct skeletal or dental changes that have already occurred.

Orthodontic assessment after tongue reduction

Orthodontic review is usually recommended once tongue reduction surgery has healed and any residual swelling has resolved, though early screening (around age 7, in line with general orthodontic guidance) is appropriate to establish a baseline even if active treatment is deferred. Assessment should establish the residual open bite or spacing, whether a Class III skeletal pattern has developed, whether mandibular growth needs monitoring through adolescence, and whether tongue posture and swallowing pattern have normalised or whether a residual tongue thrust habit persists — the latter can undermine orthodontic correction of an open bite if not addressed. Because BWS involves ongoing growth surveillance, orthodontic timing is coordinated with the wider paediatric team rather than following a fixed generic schedule; some children benefit from early interceptive treatment for a significant open bite, while others are best managed by waiting until more of the permanent dentition has erupted.

Hemihyperplasia and dental asymmetry

A subset of children with BWS have hemihyperplasia — asymmetric overgrowth affecting one side of the body more than the other, which can extend to the jaws, teeth, and facial soft tissue. Where present, this can produce an asymmetric bite, delayed or accelerated eruption on the affected side, and a facial midline discrepancy that orthodontic treatment alone cannot fully correct if the underlying skeletal asymmetry is significant. Orthodontic assessment in a child with hemihyperplasia should document facial and dental asymmetry as a baseline, since growth can be unpredictable and orthodontic or orthodontic-surgical planning may need to be revisited as the child grows. In more marked cases, orthognathic surgery once growth is complete may be discussed alongside orthodontics, though most children with BWS-related asymmetry are managed with monitoring and conventional orthodontics.

Wilms tumour surveillance and dental radiography

Children with BWS have an elevated risk of certain embryonal tumours, particularly Wilms tumour (kidney) and hepatoblastoma (liver), concentrated mainly in the first seven to eight years of life. UK surveillance protocols involve regular abdominal ultrasound scans (typically three-monthly) up to around age seven, coordinated by the child's paediatric or genetics team — this is separate from, and does not involve, dental or orthodontic radiography. Parents sometimes ask whether dental X-rays carry any additional risk given the tumour surveillance history; routine dental and orthodontic radiographs (bitewings, a single panoramic image for treatment planning) use a very low, localised dose to the jaws and are not linked to the abdominal tumour risk associated with BWS. As with any child, orthodontic radiographs should still only be taken when clinically justified and kept to the minimum needed for safe treatment planning.

What to expect from NHS orthodontic care with BWS in the UK

NHS orthodontic treatment for children and teenagers is available where the malocclusion meets the IOTN clinical threshold, and a diagnosis of BWS does not exclude a child from this pathway — anterior open bite and Class III patterns associated with macroglossia frequently meet the threshold on functional as well as aesthetic grounds. Because BWS involves multiple specialist teams (paediatric surgery, genetics, sometimes oncology surveillance, and craniofacial services), children with more complex presentations are often referred to a hospital-based or specialist orthodontic unit rather than a general practice orthodontist, particularly where hemihyperplasia or a significant skeletal pattern is present. Sharing the child's full clinical history — including surgical reports from tongue reduction and any ongoing surveillance schedule — with the orthodontic team at the first appointment helps ensure treatment planning accounts for the whole picture rather than the bite in isolation.

Useful related pages

This guide is for general information only. It is not a diagnosis, treatment plan, or substitute for advice from a registered dentist or orthodontist.