Orthodontic Treatment After Jaw Fracture

Types of jaw fracture relevant to orthodontics

Jaw fractures are classified by anatomical location, and the location determines how and when orthodontic treatment can proceed. Condylar fractures affect the joint head or neck of the mandible and are the most common mandibular fracture type; they can alter the bite directly by changing the condyle's seating position within the glenoid fossa. Symphyseal and parasymphyseal fractures affect the midline and front of the lower jaw — an area where lower incisor brackets sit — and may require a period of intermaxillary fixation or rigid internal fixation with plates and screws. Le Fort fractures affect the midface at one of three levels: Le Fort I through the maxilla above the tooth roots, Le Fort II through the nose and orbital floor, and Le Fort III through the zygomatic arch and orbital rims. Le Fort I and II fractures directly involve the tooth-bearing segment of the upper jaw and have the most direct relevance to subsequent orthodontic treatment planning.

Healing timelines: bony union and remodelling

Bone healing follows a predictable sequence but the timelines matter enormously for treatment planning. Primary bone bridging or clinical union — where the fracture is no longer mobile and begins to consolidate — typically occurs within six to eight weeks for most mandibular fractures. However, true bony consolidation where the fracture site can resist orthodontic forces without risk of displacement takes longer, generally considered complete at around three months. Full bone remodelling, where the architecture of the repair approaches normal bone density and trabecular pattern, takes six months or more and may extend to twelve months for larger or more displaced fractures. Orthodontic tooth movement applies forces to teeth and transmits them through the periodontal ligament into the alveolar bone — initiating treatment before adequate healing risks delayed union, fibrous union, or displacement of imperfectly healed segments.

How fixation hardware affects bracket placement

Open reduction and internal fixation is the standard surgical approach for displaced fractures. Titanium miniplates and screws are placed on the outer cortex of the jaw, typically along the lower border of the mandible or across fracture lines in the maxilla. This hardware is usually left in place permanently unless it causes symptoms such as thermal sensitivity or infection, in which case removal is considered after twelve months. The plates and screws themselves rarely directly obstruct bracket placement on teeth, since they sit below the gingival margin on bone. However, inflammation and scarring in the soft tissue overlying fixation hardware can affect periodontal health in that region, and any area of compromised periosteum requires more conservative bracket bonding and force application. TADs or miniscrews placed as temporary anchorage devices for orthodontics must be positioned to avoid existing fixation hardware, which requires cone beam CT planning in complex cases.

Why orthodontic treatment is deferred after fracture

Most orthodontists defer initiating or resuming active treatment for three to six months following jaw fracture fixation. This deferral serves several purposes. First, the fracture site must achieve adequate consolidation before orthodontic forces are applied to teeth in or adjacent to the fracture region; premature loading risks non-union or malunion. Second, post-fracture swelling, trismus (restricted jaw opening), and soft tissue healing make bracket bonding technically difficult and clinically uncomfortable in the early weeks. Third, the bite itself is often temporarily altered by swelling, condylar remodelling, and muscle splinting; taking orthodontic records before the occlusion has stabilised produces an inaccurate baseline from which to plan treatment. Many fracture patients are already in orthodontic treatment when injury occurs, in which case archwires are typically reduced to passive stainless-steel wires or removed entirely during the healing phase, with a bonded retainer or simple removable retainer used to maintain position.

Pre-surgical orthodontics for planned osteotomies after fracture

Patients who sustain jaw fractures that result in significant malocclusion not fully correctable by fracture reduction alone — particularly condylar fractures causing an anterior open bite, or comminuted fractures causing significant arch discrepancy — may eventually require orthognathic surgery as a planned secondary procedure once healing is complete. In these cases, pre-surgical orthodontic treatment follows the standard orthognathic orthodontics protocol: decompensation of tooth positions, arch alignment, and coordination, followed by surgery and post-surgical finishing. The difference from primary orthognathic cases is that the baseline anatomy has been altered by the fracture, requiring joint planning between the orthodontist and oral and maxillofacial surgeon using updated CBCT imaging to account for any post-fracture skeletal changes including condylar remodelling.

TMJ damage from condylar fractures and bite impact

The condyle is the part of the lower jaw that forms the temporomandibular joint, and condylar fractures are uniquely relevant to bite and orthodontic outcomes. In subcondylar fractures where the condylar head remains within the joint capsule, management is often conservative: soft diet, physiotherapy, and monitoring. However, healing may result in condylar shortening, deviation of the lower jaw to the fractured side, and a posterior open bite on the opposite side. In children, a condylar fracture can affect subsequent jaw growth since the condyle is a growth centre of the mandible — potentially causing progressive facial asymmetry. Orthodontic treatment planning for post-condylar fracture patients must account for the altered joint anatomy; in cases with significant condylar resorption or remodelling, total joint replacement by the OMFS team may precede or be combined with orthognathic surgery before definitive orthodontic finishing.

Occlusal rehabilitation after complex fractures

Complex jaw fractures — particularly panfacial fractures involving multiple Le Fort levels combined with mandibular fractures — can leave patients with significant residual malocclusion even after anatomically accurate surgical reduction. Post-fracture occlusal rehabilitation requires a multidisciplinary approach: orthodontics to align the dental arches, restorative dentistry to address damaged or missing teeth, and in some cases secondary osteotomy or distraction osteogenesis to correct residual skeletal discrepancy. The goals of rehabilitation are restoring functional occlusion for eating and speech, achieving acceptable aesthetic outcomes, and providing a stable long-term result. Realistic expectations must be established early; perfect occlusion is not always achievable after severe comminuted fractures, and the treatment plan must balance what is surgically possible with the patient's overall recovery.

UK maxillofacial unit referral pathway

In the UK, jaw fractures are managed by oral and maxillofacial surgery (OMFS) units, most of which are based at NHS teaching hospitals and district general hospitals with a trauma unit. Patients admitted via A&E with suspected jaw fractures are assessed and, if confirmed on CT imaging, either admitted for immediate surgery or listed for semi-elective repair once swelling has subsided — typically within five to seven days. Referral for orthodontic input after fracture usually comes from the OMFS team, either from the combined orthodontic-OMFS clinic at the treating hospital or via referral to a specialist orthodontist. In England and Wales, combined orthognathic and orthodontic treatment arising from traumatic jaw fracture is eligible for NHS funding where there is a clear functional indication, as it falls within the clinical rationale for jaw surgery rather than purely elective cosmetic treatment.

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.