science

Root fracture

Root fracture is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Root fracture rather than just read about it. In short: Root fracture of the tooth is a dentine cementum fracture involving the pulp. Traumatic root fracture occurs most often in the middle third of the roots of fully erupted and fully formed teeth.

Key takeaways

Root fracture belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Root fracture to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Root fracture from memory before moving on to harder problems.

Reference excerpt

Root fracture of the tooth is a dentine cementum fracture involving the pulp. Traumatic root fracture occurs most often in the middle third of the roots of fully erupted and fully formed teeth. However, root treated teeth are more susceptible to root fracture, as this involves removing root dentine, thereby weakening the tooth. Objectives of the treatment is to reposition the coronal fragments to allow revascularisation of the tooth, therefore maintaining aesthetics and functional integrity.

Vertical root fracture Vertical Root Fractures are longitudinally orientated fractures of the root. They extend from the root canal to the periodontium. They are usually seen in root filled teeth, however they can also be seen in non-restored teeth. The fractures can involve the whole length of the root or only a section of it. When un-recognised they lead to frustration and inappropriate endodontic therapy. The time between a root filling and a fracture is around 39 months, but they can occur during the treatment. Diagnosis is tricky as there as signs and symptoms are frequently delayed and no single clinical feature indicates a root fracture is present.

Signs and symptoms They often present with discomfort/soreness which may be associated with an infection. Pain is usually mild to moderate in its intensity. Patients may also report a pain on biting. Another characteristic feature is the repetitive and frequent dislodgement of an apparently well-fitting post.

Predisposing factors Root Canal Anatomy: Roots narrower in mesio-distal dimension are more susceptible to fracture. Dentin Characteristics: Dentine of pulpless teeth is stiffer and more susceptible to fracture Corrosion: Corrosion of pins and posts can contribute Use of a spreader: The wedging effect of the spreader during lateral condensation can lead to it.

Treatment A clinician should remember that whilst a root fracture remains, bone around the tooth is continuing to be lost, compromising the success of any future potential implants. Anterior teeth with a vertical root fracture have a very poor prognosis and treatment is mainly extraction. Multi-rooted teeth can be successfully treated by removing the fractured root, either by root amputation or hemisection.

Horizontal root fracture Horizontal root fracture is when the fracture line is perpendicular or oblique to the long axis of the tooth. It can occur in the apical, middle or coronal portion of the root. Horizontal root fracture accounts for only 3% of all dental injuries.

Detection Horizontal root fractures can often be identified by taking a peri-apical radiograph. Now, with the introduction of cone beam computed tomography (CBCT), it is possible to view root fractures three-dimensionally.

Treatment The treatment of horizontally root-fractured teeth involves re-positioning, stabilisation and occlusion adjustment, with a good chance of survival. The exception to this is when the horizontal fracture affects the coronal third of the root, in which case extraction is necessary in 80% of cases. In this case of pulpal necrosis, which occurs in 20-44% of root fracture cases, this can be treated through root canal treatment or endodontic surgery. When the coronal fragment of the tooth is stable, then splinting is unnecessary. However, in the case that the fracture affects the coronal third of the root, is in close-proximity to the cemento-enamel junction, and it is almost impossible to prevent the contents of the oral cavity contacting the fracture, then splinting for at least 2 months is required.

References

Worked examples

Example 1 — a first encounter with Root fracture

Start with the simplest possible case. Write down what Root fracture claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Root fracture before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Root fracture ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Root fracture

In research: Root fracture appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Root fracture in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Root fracture is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dentistry, so understanding it makes those chapters shorter.
In everyday life: Look for Root fracture outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Root fracture in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Root fracture means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Root fracture out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Root fracture in simple terms?

Root fracture of the tooth is a dentine cementum fracture involving the pulp. Traumatic root fracture occurs most often in the middle third of the roots of fully erupted and fully formed teeth.

Why does Root fracture matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Root fracture?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Root fracture.