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Retrieving a fractured abutment screw: a step-by-step clinical approach

Thu, 15 Oct 2026 08:21:22 +0530

A fractured abutment screw is one of the more stressful complications in implant prosthodontics. The implant itself is usually still integrated and healthy, yet the restoration cannot be retained until the fragment is out of the internal thread. How the fragment is removed often decides whether the implant can be restored again in the usual way or whether the internal connection is damaged. This article sets out, for dentists and dental students, a calm, stepwise approach to broken abutment screw removal, from assessment to prevention.

Why abutment screws loosen and fracture

Screw loosening and screw fracture are recognised mechanical complications of implant-supported restorations. Systematic reviews of implant prosthodontic complications report that screw loosening is more common than screw fracture, and that fracture is often preceded by a period of repeated loosening that was not noticed or not addressed.

The underlying mechanism is usually a loss of preload. When a screw is tightened to the manufacturer's torque value, it stretches slightly and holds the abutment against the implant platform. Settling of the mating surfaces, micromovement under load and cyclic loading can reduce this preload over time. Once the joint opens, the screw is exposed to bending and fatigue loads it was not designed to carry. Factors associated with this include:

Inadequate or unverified tightening torque, or no retightening after initial settling where the manufacturer recommends it.
Occlusal overload, parafunction such as bruxism, and cantilevers or wide occlusal tables.
A poorly fitting or non-passive framework.
Non-original or mismatched components.
Reuse of a screw that has already been tightened and removed several times.

Initial assessment

Before any instrument touches the fragment, take time to understand the situation:

Confirm the cause. A mobile crown on an implant may mean a loose screw, a fractured screw, a fractured abutment or, rarely, a failing implant. A periapical radiograph shows the level of the fracture line and whether the fragment sits above or below the top of the implant.
Identify the implant system. Check the patient's records, implant card or the original treating clinician's notes. The connection type, screw size and the availability of the manufacturer's retrieval instruments affect every later step.
Assess access. Note the angulation, the mouth opening and whether the fragment can be seen directly under magnification.
Explain the situation to the patient. Discuss that retrieval is often possible, that some cases need a different solution, and what the alternatives would be if the internal thread is damaged.

A stepwise approach to retrieval

The principle throughout is to begin with the least invasive method and escalate only when needed. Magnification and good illumination help at every stage.

Step 1: Remove the restoration and expose the fragment

Remove the crown and the coronal part of the abutment. Irrigate the screw channel to clear cement, debris and any fluid so that the top of the fragment is visible. Assess whether the fragment is loose or tight in the thread.

Step 2: Counter-clockwise rotation with a fine instrument

In many cases, once the load is removed, the fragment is not bound tightly. A sharp explorer, a fine probe or a small endodontic instrument can be placed against the edge of the fragment and moved in a counter-clockwise direction to rotate it out. Ultrasonic instruments used gently, with light pressure and irrigation, can help to loosen a fragment by vibration. Avoid contact with the internal threads of the implant.

Step 3: Manufacturer retrieval kits

When the fragment is bound, most major implant systems offer dedicated rescue or retrieval kits. These typically include a guide that centres a reverse-cutting drill or a fragment remover on the screw, so that the instrument engages the fragment rather than the implant threads. Using the drill at low speed with irrigation, as the kit instructions describe, is safer than improvising freehand. A guide sleeve matched to the implant system is the main safeguard against damaging the platform.

Step 4: Creating a slot

If no kit is available and the fragment is visible, some clinicians create a narrow slot in the top of the fragment with a fine bur under magnification, then use a small flat-bladed instrument to unscrew it. This carries a real risk of cutting into the internal connection, so it calls for care, steady support and a clear view.

Step 5: When retrieval is not possible

If the fragment cannot be removed, or the internal thread is damaged, options include thread repair with a manufacturer-specific tap where one exists, a custom post-retained restoration that does not rely on the original screw thread, leaving the implant submerged ("sleeping") or, as a last resort, removal of the implant and replacement. Referral to a colleague with experience in implant complications is a reasonable choice at this stage.

After retrieval

Once the fragment is out:

Inspect the internal thread under magnification and, where possible, test it with a new screw by hand.
Use a new original screw. Do not reuse the fractured screw's partner components without checking them.
Tighten to the manufacturer's recommended torque with a calibrated torque wrench, and retighten after a few minutes if the manufacturer advises it.
Check the fit of the abutment and the restoration radiographically.
Review the occlusion carefully, including excursive contacts, and adjust if needed.

Preventing recurrence

A screw fracture is often a sign of a mechanical problem in the restoration as a whole. Review the cause before replacing the components:

Is the occlusal scheme and the size of the occlusal table appropriate?
Is there parafunction, and would an occlusal splint help?
Is the framework passive, or does it need to be remade?
Were original components and the correct torque used?
Would shorter recall intervals help to pick up early signs of loosening?

Recording the implant system, components used and torque values in the patient's notes makes any future maintenance easier, for the treating clinician or for a colleague.

Frequently asked questions

Can a fractured abutment screw be removed without damaging the implant? Often, yes, particularly when the fragment is not bound and can be rotated out with a fine instrument. The risk of damage rises when drills or burs are needed, which is why system-specific guides are preferred.

Should I use a new screw after retrieval? Yes. A new original screw from the implant manufacturer, tightened to the recommended torque, is the general recommendation.

Is screw loosening a warning sign? Repeated loosening suggests that preload is being lost, and is worth investigating before a fracture occurs.

Learning implant complication management with ADC

Managing implant complications is one of the areas taught at the ADC E-Learning Hub, the online training platform for dentists, dental students and clinicians run by Dr. Mohit Dhawan and Dr. Rosy Dhawan. On training.theadc.dental Dr. Mohit Dhawan's teaching includes troubleshooting strategies for hardware and prosthetic complications, and the site refers to a lecture on Rescue of Broken Abutment Screws. Lessons are video-based with downloadable notes, a digital certificate is awarded for each completed lecture and module, and offline clinical classes are also offered, with pre-enrolment online. Browse courses at All courses.

This article is general clinical education for dental professionals. It does not replace the implant manufacturer's instructions for use, formal training or individual clinical judgement.

Dental implant complications and how to avoid them

Tue, 10 Feb 2026 22:43:30 +0530

Dental implants are a well-established way to replace missing teeth, and most implants heal and work well for many years. Like any surgical treatment, though, dental implant complications can happen. Some appear in the first weeks after surgery, others years later. Knowing what can go wrong, the early warning signs and the steps that lower your risk helps you protect your implant. This guide covers peri-implantitis, infection, implants that do not fuse with the bone, nerve and sinus problems and wear-and-tear problems, and explains how to avoid implant failure.

Early and late dental implant complications

Implant complications are often grouped by when they appear:

Early (in the first weeks and months): infection at the surgical site, an implant that does not fuse with the bone, and nerve or sinus problems linked to where the implant was placed
Late (after the implant has healed and the tooth is fitted): inflammation of the gum and bone around the implant (peri-implant mucositis and peri-implantitis), and mechanical problems such as a loose screw or a chipped crown

Most of these are easier to manage when they are found early, which is why check-ups matter even when the implant feels fine.

Peri-implant mucositis and peri-implantitis

The most common long-term problem is inflammation caused by plaque around the implant. It has two stages (Berglundh and colleagues, 2018):

Peri-implant mucositis: the gum around the implant is red, swollen or bleeds when brushed, but the bone is not affected. It can usually be reversed with professional cleaning and better daily cleaning.
Peri-implantitis: the inflammation has spread to the bone, and bone around the implant is being lost. The gum may bleed, look swollen or release pus, and the gum line may recede. Without treatment, the implant can lose so much support that it becomes loose.

Illustration: a healthy implant, inflamed gum without bone loss (peri-implant mucositis) and inflammation with bone loss (peri-implantitis). Simplified side view. Not a patient photograph.

People with a history of gum disease, poor plaque control or irregular check-ups, and people who smoke, have a higher risk of peri-implantitis (Derks and Tomasi, 2015; Herrera and colleagues, 2023). If you have bleeding gums around an implant, see our loose implant and gum disease pages.

Implant infection signs after surgery

Some swelling, bruising and soreness are normal for a few days after implant surgery. An infection is more likely if:

pain or swelling gets worse after the first few days instead of better
there is pus, a bad taste or a bad smell from the site
you have a fever or feel generally unwell
the gum stays very red or the stitches come apart early

Contact your dentist promptly if you notice any of these. Follow the instructions you are given after surgery, and read FAQs after dental implant surgery.

When an implant does not fuse with the bone

After placement, the bone grows onto the implant surface, a process called osseointegration. The bone usually takes about two to six months to heal around the implant, depending on the bone and the site. Occasionally the bone does not bond, and the implant stays mobile. This is more likely with poor bone quality or quantity, smoking, poorly controlled diabetes, infection, or too much pressure on the implant while it heals.

An implant that has not fused cannot be tightened. It is usually removed, the site is allowed to heal, sometimes with bone grafting, and a new implant may be placed later. Read stages of dental implant osseointegration, why healing time matters and failed dental implant: care, replacement and prevention.

Nerve and sinus complications

These depend on where the implant is placed:

Lower jaw: a nerve runs inside the lower jaw, supplying feeling to the lower lip and chin. If an implant is placed too close to it, the lip or chin can feel numb, tingly or painful. Tell your dentist straight away if numbness does not wear off after the anaesthetic should have worn off.
Upper jaw: the sinus sits above the upper back teeth. If there is not enough bone below it, an implant can enter the sinus unless the bone is built up first. Read what to expect during a sinus lift and our sinus lift page.

Careful planning with a 3D CBCT scan shows the position of the nerve, the sinus and the available bone before surgery, which helps avoid these problems.

Mechanical problems: loose screws and chipped crowns

Implants and their crowns are subject to the same biting forces as natural teeth. Over time:

the small screw that holds the crown can loosen, so the tooth feels slightly loose or clicks
the porcelain on the crown can chip
rarely, parts of the implant can wear or break

Heavy biting and grinding of the teeth increase these risks. A loose crown should be checked soon, because a loose screw can damage the parts if it is left. If you grind your teeth, ask about a night guard; see our bruxism page.

How to avoid implant failure and complications

Illustration: steps before surgery, at surgery and after treatment that lower the risk of implant complications. Simplified checklist. Not a patient photograph.

Before surgery

Tell your dentist about your medical history and all your medicines, including blood thinners and bone medicines
Have any gum disease and decay treated first
Stop smoking, or cut down as much as possible; smoking is linked with more implant failures (Chrcanovic and colleagues, 2015). Read smoking and dental implants
If you have diabetes, aim to keep it well controlled
Expect a full examination and a CBCT scan, so the bone, nerve and sinus can be assessed

At surgery and during healing

The implant position is planned from the scan, with a surgical guide where needed
Bone grafting or a sinus lift is planned if there is not enough bone; read dental implants with bone loss
Follow your after-surgery instructions, avoid chewing on the implant while it heals and keep the site clean
The final tooth is fitted only when the implant is stable

After the tooth is fitted

Brush twice a day and clean around the implant every day with interdental brushes or floss; read home care tips for healthy dental implants
Keep up regular check-ups and professional cleaning at the intervals your dentist advises
Wear a night guard if you grind your teeth
Report bleeding, swelling, a bad taste or looseness early; do not wait for pain

Dental implants at ADC, Chandigarh

At ADC – Centre for Restorative and Implant Dentistry, dental implants are placed by Dr. Mohit Dhawan, ITI Fellow, ITI Section India (2026), and ADC has placed over 6000 dental implants. Treatment is planned with CBCT scans and surgical guides where needed, the Straumann implant system is used, and implant stability is measured with an ISQ device before the final tooth is fitted. Learn more on our dental implants in Chandigarh page, in are dental implants safe? Myths and facts and in how to choose an implant specialist. The clinic is in Sector 21, Chandigarh, within easy reach of Mohali, Panchkula and Zirakpur.

For dentists

If you would like to learn more about implant planning, osseointegration and managing hardware problems, see the ADC Basic Implantology Course, Beyond Osseointegration and Hardware Complications in Dental Implants on the ADC E-Learning Hub.

Frequently asked questions

What is the most common dental implant complication?
Inflammation around the implant caused by plaque is the most common long-term problem. In its early form (peri-implant mucositis) only the gum is affected and it can usually be reversed; if it reaches the bone, it is called peri-implantitis.

What are the signs of a failing implant?
Bleeding or swelling of the gum around the implant, pus or a bad taste, the gum line receding, pain on biting, or an implant or crown that feels loose. See your dentist promptly if you notice any of these.

Can peri-implantitis be treated?
Yes. Treatment depends on how much bone has been lost. It can include professional cleaning around the implant, improving daily cleaning, and in some cases surgery to clean the implant surface and, where possible, rebuild bone. The earlier it is found, the better.

Is a loose implant crown the same as a failed implant?
Not always. Often the screw holding the crown has loosened and can be retightened or replaced. A loose implant in the bone is more serious and needs prompt assessment.

Can I have implants if I smoke or have diabetes?
Often yes, but the risks are higher. Stopping smoking and keeping diabetes well controlled lower the risk. Your dentist will discuss this with you at your consultation.

How long does an implant take to heal?
The bone usually takes about two to six months to heal around the implant, depending on the bone and the site. Instalment and financing options are available; ask our team for details.

Book an implant consultation in Chandigarh

This article is general information, not advice for any individual. Please speak with your dentist about your own situation. If you are planning implants or are worried about an implant you already have, you are welcome to book a consultation with Dr. Mohit Dhawan at ADC – Centre for Restorative and Implant Dentistry:

Online booking: ADC Zoho Bookings
Phone: +91-708-780-0016
Email: help@theadc.dental
Clinic: ADC- Centre for Restorative and Implant Dentistry, 1197, Sector 21B, Sector 21, Chandigarh, 160022, India

Mon–Fri 10:00 AM–6:30 PM; Sat 10:00 AM–5:00 PM; Sunday closed. You can also request a consultation online.

Reviewed by Dr. Mohit Dhawan, MDS (Prosthodontics, Crown & Bridge and Implantology).

References

Berglundh T, Armitage G, Araujo MG, et al. Peri-implant diseases and conditions: Consensus report of workgroup 4 of the 2017 World Workshop on the Classification of Periodontal and Peri-Implant Diseases and Conditions. J Clin Periodontol. 2018 — PubMed 29926491
Derks J, Tomasi C. Peri-implant health and disease. A systematic review of current epidemiology. J Clin Periodontol. 2015 — PubMed 25495683
Herrera D, Berglundh T, Schwarz F, et al. Prevention and treatment of peri-implant diseases — the EFP S3 level clinical practice guideline. J Clin Periodontol. 2023 — PubMed 37271498
Chrcanovic BR, Albrektsson T, Wennerberg A. Smoking and dental implants: a systematic review and meta-analysis. J Dent. 2015 — PubMed 25778741
Cleveland Clinic. Dental implants — clevelandclinic.org