CASE-034 · Fixed Orthodontics

Severe Crowding with a Blocked-Out Upper Canine and Anterior Edge Wear

Severe upper and lower crowding with an upper canine blocked out of the arch, rotated premolars, an irregular incisal plane and early edge wear — a case where space had to be created in a defined order before any alignment could be attempted.

Findings: 05
Options: 03
Stages: 06

Fixed OrthodonticsComplex CasesDigital Planning

Clinical records · drag to compare

Post-treatment frontal intraoral view with aligned arches and a level incisal plane

Pre-treatment frontal intraoral view showing severe crowding and a blocked-out upper canine

BEFOREAFTER

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Clinical challenge

Creating space for a fully blocked-out canine without proclining an anterior segment that was already showing edge wear from an unfavourable contact pattern.

Outcome

Canine brought into the arch, crowding resolved without extractions, incisal plane levelled and hygiene access restored.

Diagnostic findings

Upper canine displaced buccally and blocked out of the arch
Severe crowding with overlapping and rotated anterior teeth
Irregular incisal plane with early attrition on the upper incisal edges
Rotated and imbricated premolars with contact points not in line
Marginal gingival inflammation around the crowded contacts

Problem list

Arch space deficit greater than the alveolus could absorb by expansion alone
Crowding maintaining plaque stagnation and gingival inflammation
Edge wear indicating the anterior teeth were carrying load they were not positioned for

Treatment objectives

Create space in a sequence, not all at once
Bring the canine into the arch along a controlled path
Level the incisal plane and relieve the anterior load
Restore access for hygiene at the crowded contacts

Options weighed

Expansion and alignment only
Insufficient space for the measured deficit; would push roots outside the alveolus.
Extraction of the blocked-out canine
Fast space gain; sacrifices the tooth best suited to guidance.
Staged space creation then canine alignment
Longest route; the only option that keeps the canine and respects the bony envelope.

The decision

Staged space creation — posterior derotation and measured transverse gain first, interproximal reduction second, canine alignment last.

Clinical reasoning

The crowding was the symptom; the sequence was the treatment. Rotated premolars were occupying more arch length than their true width, so derotation returned space that would otherwise have been bought with proclination. Only after that ledger was settled did the canine have a path that did not run through the adjacent roots.

Strategy

Fixed appliances with a staged space ledger: derotate the posterior segments, gain transverse width within the CBCT-verified limit, apply staged IPR, then engage the canine on a light continuous archwire with an open coil holding its space.

Biomechanics

Light continuous forces throughout; the canine was left unengaged until its space was measurably present, then brought in with an open coil and a piggyback wire to keep the adjacent roots from tipping into the gap.

Treatment sequence

01Hygiene phase and baseline records
02Posterior derotation and transverse gain
03Staged interproximal reduction
04Canine engagement and alignment
05Levelling, torque control and finishing
06Fixed lingual retention

Digital workflow

Alveolar width mapping set the expansion ceiling and an arch-length audit quantified how much space derotation would return before any IPR was scheduled.