Osteogenesis Imperfecta and Orthodontics UK

What is osteogenesis imperfecta and how does it affect teeth?

Osteogenesis imperfecta is a group of heritable connective tissue disorders caused by mutations in collagen type I genes (predominantly COL1A1 and COL1A2), resulting in bone fragility. The condition is classified into types I through IV based on severity, with type I being the mildest and type III the most severe. Approximately 80% of OI patients also have dentinogenesis imperfecta type I (DI-I), in which the dentine matrix is abnormally mineralised, producing teeth that appear amber, blue-grey, or opalescent. DI-I teeth have weaker enamel-dentine bonds and increased susceptibility to attrition and fracture under orthodontic or dietary loading. Not all OI patients have dental involvement — type I (mild OI) often presents without dentinogenesis imperfecta — but dental assessment should be part of initial OI management in all cases.

Bracket bonding challenges with fragile enamel in OI

Bonding orthodontic brackets to enamel in OI patients requires careful assessment because the enamel may be structurally compromised, thin, or poorly mineralised depending on the OI type and presence of dentinogenesis imperfecta. Standard acid-etch bonding (37% phosphoric acid) can be used but the etch response may be atypical, producing irregular or reduced etching patterns on DI-I enamel. Some clinicians use self-etching primers which apply a milder acid and may be preferable where enamel structure is uncertain. Bracket selection should prioritise smaller base area to reduce the peel force at debond. Lingual fixed appliances should be avoided on DI-I teeth because the increased loads from torquing mechanics on weakened enamel are harder to predict. Removable clear aligners are often preferred in OI as they distribute forces more diffusely, do not require direct bonding, and allow easy removal if complications arise. Where fixed braces are clinically necessary, an experienced orthodontist working within a specialist craniofacial centre is recommended.

Debonding and fracture risk — the peel-off technique

The debond appointment carries the highest fracture risk in orthodontic treatment for OI patients. Standard bracket removal using debonding pliers applies a peel stress concentrated at the bracket base, which can fracture the enamel surface or, in DI-I teeth, cause a deeper fracture through weakened dentine. The peel-off technique minimises this risk: a scaler or probe is used to lift the bracket from the gingival margin edge first using minimal lateral and peeling force rather than direct debonding plier force. The bond strength should be checked throughout treatment — if brackets debond spontaneously during treatment without significant impact, this may indicate the bond is appropriate for the enamel quality. Post-debond, remaining adhesive should be removed using a fine tungsten carbide bur at low speed with water cooling rather than aggressive polishing, to minimise surface enamel loss on already fragile surfaces. Clinical photographs and written consent documentation of the pre-treatment enamel condition are advisable in case of disputed fractures.

Bisphosphonate therapy and orthodontic tooth movement

Many patients with moderate-to-severe OI are treated with bisphosphonates — particularly pamidronate (intravenous) in children and alendronate or risedronate (oral) in adults — to increase bone mineral density and reduce fracture frequency. Bisphosphonates work by inhibiting osteoclast activity, which is the cellular mechanism that removes bone on the pressure side of orthodontic tooth movement. Inhibited osteoclast activity slows or may halt tooth movement. Clinical studies in OI patients on bisphosphonate therapy have shown significantly reduced rates of orthodontic tooth movement compared with non-bisphosphonate controls, with some patients showing near-complete resistance to movement during active treatment. The implications are: treatment time may be substantially extended; tooth movement goals may need to be reduced in ambition; and anchorage demands change because anchoring teeth are also less likely to move. There is also a risk of medication-related osteonecrosis of the jaw (MRONJ) if extractions are needed during orthodontic treatment — the risk is lower with bisphosphonates used for OI (low cumulative dose) than in cancer patients on high-dose regimens, but it is not zero. Extraction decisions should be made conservatively and with haematology or metabolic medicine input. Bisphosphonate holiday (drug cessation before extractions) may be discussed with the prescribing team, though the evidence for this in OI patients specifically is limited.

Skeletal Class III from maxillary retrusion in OI

OI types III and IV often present with midfacial hypoplasia — underdevelopment of the maxilla relative to the mandible — producing a skeletal Class III malocclusion. This presents differently from the Class III seen in conditions such as Crouzon or Apert syndromes, but the functional consequences of an anterior crossbite with reduced overjet are similar: restricted incisor guidance, increased risk of anterior tooth wear, and potential temporomandibular joint loading. In growing children, early orthopaedic intervention with facemask (reverse pull headgear) may be considered to stimulate maxillary forward growth, though the fragility of the facial skeleton in moderate-to-severe OI limits the forces that can safely be applied. In adult OI patients, the definitive correction of a skeletal Class III requires orthognathic surgery — Le Fort I osteotomy to advance the maxilla and/or bilateral sagittal split osteotomy to set back the mandible. Surgical planning in OI requires close liaison between the orthognathic surgeon and metabolic medicine, and pre-operative bisphosphonate management, bone densitometry, and fracture risk assessment are standard.

Jaw fracture risk during orthodontic treatment and extractions

In severe OI, the mandible and maxilla may themselves be fragile, and jaw fracture has been reported following routine dental procedures including extractions, deep scaling, and, rarely, prolonged mouth opening for dental appointments. Practical measures to reduce risk include: limiting appointment duration to 30–45 minutes for complex procedures; using a bite block or mouth prop to avoid excessive mouth opening forces; ensuring the patient is positioned comfortably before any intraoral work; performing all extractions (if unavoidable) under specialist care with appropriate anaesthetic cover; and having a clear pathway for urgent maxillofacial review if jaw fracture is suspected post-procedure. The anaesthetic considerations for OI patients are substantial — prone positioning is contraindicated, suxamethonium is avoided, and all handling during general anaesthesia requires specific OI protocols. Orthodontic treatment under general anaesthesia (bonding records, debond) should only be undertaken in specialist centres with anaesthetic experience of OI.

Staged orthodontic-restorative rehabilitation and NHS pathway

For OI patients with significant dental involvement (multiple worn or fractured teeth, missing teeth, or severe malocclusion), the most appropriate approach is a coordinated orthodontic-restorative rehabilitation plan. This typically involves: stabilising active dental disease first (treating abscesses, carious teeth, and gum disease); orthodontic pre-restorative space creation or alignment; followed by restorative dentistry to restore severely worn or fractured teeth using composite, ceramic, or implant-supported restorations as appropriate. In the UK, patients with OI are typically managed under the NHS complex needs pathway through a specialist craniofacial centre or dental hospital with paediatric dentistry, orthodontics, restorative dentistry, and oral and maxillofacial surgery working in coordination. A referral from the GP or community dentist to the craniofacial MDT is the appropriate starting point for children. For adults, a referral to a dental hospital consultant in special care dentistry or restorative dentistry will coordinate the OI-specific treatment plan. Online orthodontic photo assessments can help patients and families understand likely options before their specialist appointments.

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.