Ankylosed Teeth: The One Tooth Aligners Cannot Move

What it is

An ankylosed tooth is fused to bone, no orthodontic force will move it, and every case must be screened before staging.

How it works

The underlying mechanism combines a diagnostic input, a planning decision and a delivery mechanism. Each is covered separately in the ClinCheck planning and clear aligners biomechanics explainers.

When it applies

Not every case is a candidate. Screening involves the iTero scan, a periodontal check, and, for skeletal cases, a cephalometric analysis.

Evidence

Published aligner literature (AJO-DO, Angle Orthodontist) informs the numbers in this article. Where a specific figure is cited, it reflects a systematic review or a manufacturer-published multi-centre study.

What to ask your orthodontist

• Is this the right option for my specific malocclusion?
• What are the alternatives, and their pros/cons?
• What does my refinement plan look like?
• What does retention look like for my case?

See also: invisible braces pillar, treatment cost drivers.

The full picture

An ankylosed tooth is fused to bone, no orthodontic force will move it, and every case must be screened before staging. The evidence base draws from peer-reviewed orthodontic literature (AJO-DO, Angle Orthodontist, European Journal of Orthodontics), Align Technology's multi-centre outcomes data, and clinic audit records. Three realities shape the topic in Indian practice: predictability varies by movement, compliance is the hidden multiplier on every timeline, and retention is chosen at planning, never after debond.

Read this alongside the aligner movement predictability table, because the honest limits of what aligners can move are the honest limits of what this article can promise. Compliance and hygiene are covered in the 22-hour wear rule explainer.

Decision framework

1. Diagnostics first. Full records, intra-oral photos, radiographs, iTero scan, periodontal chart, precede any commitment.
2. Biomechanical feasibility. The predictability table is the reference for what aligners will and will not deliver in this case.
3. Cost and time envelope. Treatment cost drivers sets the vocabulary; the specific case sets the number.
4. Retention plan. Fixed vs removable retention has evidence on both sides; case biomechanics decide.
5. Written scope. Refinement policy, retainer replacement policy, and progress-check cadence, all in writing before treatment starts.

Phase	What happens	Time cost	Risk if skipped
Records	Photos, scans, radiographs, charting	45–60 min	Plan built on stale data
Consent	Written scope, refinements, retention	20–30 min	Downstream cost disputes
Delivery	First tray, chewie coaching, hygiene brief	30–45 min	Week-1 compliance drop
Review	Progress vs ClinCheck at trays 10 / 20 / 30	15–20 min each	Late tracking failure
Debond & retention	Attachment removal, polish, retainers	90–120 min	Relapse within 12 months

Signals of a good decision

• The clinician can defend the choice in one paragraph without jargon.
• The refinement policy is written before treatment starts.
• The retention protocol matches the biomechanics of the case.
• Cost, time, and compliance expectations are documented in the patient record.

Common pitfalls

• Skipping records. A ClinCheck built on a stale scan is a plan built on a guess.
• Optimistic staging. More movement per tray is not faster treatment, it's more refinement.
• Undocumented scope. Verbal commitments become disputes at month 18. Write it down.
• Retention as an afterthought. The plan for month 24 belongs on the page you sign in month 0.

Frequently asked questions

How does this apply to my case?

Every aligner case is different, the same principle can produce different sequencing depending on crowding, bite class, and periodontal status. Book a records appointment for a case-specific answer.

How long does the process take end-to-end?

Most aligner cases run 12, 24 months from delivery to debond, with a further 12+ months of active retention. The article's specific topic can shorten or extend that envelope.

Is Dr. Rockson Samuel accepting new patients?

Yes, Indira Dental Clinic is currently accepting aligner consultations. Message +91 70106 50063 or use the assessment quiz to start.

Peer-reviewed sources

• Rossini G, et al. Efficacy of clear aligners in controlling orthodontic tooth movement: a systematic review. Angle Orthodontist, 2015.
• Papageorgiou SN, et al. Clinical effectiveness of Invisalign orthodontic treatment: a systematic review and meta-analysis. European Journal of Orthodontics, 2020.
• Kravitz ND, et al. How well does Invisalign work? A prospective clinical study. AJO-DO, 2009.
• Robertson L, et al. Effectiveness of clear aligner therapy: A systematic review. Orthodontics & Craniofacial Research, 2020.

Medical disclaimer

This article is educational and does not substitute a chairside diagnosis. Aligner suitability, sequencing, and cost depend on records, radiographs, and clinician judgement. Book an in-person or teleconsultation before acting on anything you read here.

Talk to a clinician

WhatsApp Dr. Rockson Samuel's team on +91 70106 50063 for a personalised consultation at Indira Dental Clinic, 3rd Floor, 54, Katpadi Road, Vellore.

Message on WhatsApp · Book an assessment · See pricing

Related reading

• Clear aligners primer
• ClinCheck treatment planning
• Aligner movement predictability table
• Refinement rounds explained
• Retention protocols
• Invisible braces pillar

Clinically reviewed by

Dr. Rockson Samuel, B.D.S (RGUHS), Founder, Indira Dental Clinic, Vellore. 15+ years of general dentistry, 5,000+ patients guided through orthodontic and restorative treatment. Reviewed on 2026-07-22.