Preventing gingival recession during orthodontic treatment

Preventing gingival recession during orthodontic treatment — DentoLink

Recession in the orthodontic context
Pathophysiological mechanisms
Risk factors
Preventive diagnosis: angles and measurements
Planning within the bony envelope
Plaque control during treatment
Preventive mucogingival surgery
Monitoring and interception
Managing established recession
Practical summary

Recession in the orthodontic context

Gingival recession is the apical migration of the marginal gingiva beyond the cemento-enamel junction, exposing the root surface. In orthodontics it is among the best-documented periodontal adverse effects, yet it is by no means an unavoidable outcome of treatment.

Available systematic reviews show that orthodontic treatment may be associated with a small but statistically significant increase in the prevalence and severity of recession, particularly at the mandibular incisors. The mean effect remains modest at population level but becomes clinically major at individually vulnerable sites — hence the value of a risk-screening approach rather than a generalized fear of the procedure.

The current reference is the Cairo classification (RT1, RT2, RT3), integrated into the 2018 international classification, which is based on the interproximal attachment level rather than on the purely mucogingival landmarks of the older Miller classification.

Type (Cairo)	Interproximal attachment	Coverage prognosis
RT1	No interproximal loss	Complete root coverage achievable
RT2	Interproximal loss ≤ buccal recession	Complete coverage possible but uncertain
RT3	Interproximal loss > buccal recession	Complete coverage not predictable

Terminology

The term "periodontal phenotype" (gingival thickness + keratinized tissue width + bone thickness) replaced "biotype" after the 2017 World Workshop. Unlike biotype, the phenotype can be modified — notably by grafting — which opens the door to surgical prevention.

Pathophysiological mechanisms

Orthodontically related recession fundamentally results from tooth movement that drives the root out of the alveolar bony envelope. When the buccal bone plate is thin, the movement creates a dehiscence or a fenestration: the gingiva, deprived of bony support and exposed to inflammation or trauma, then migrates apically.

1. Movement beyond the bony envelope

Proclination or buccal tipping thins and then perforates the buccal cortical plate, creating a bony dehiscence — the anatomical substrate of future recession.

2. Gingiva without underlying bone support

Over a dehiscence the gingival tissue becomes vulnerable. A thin phenotype and a narrow band of keratinized tissue compound this fragility.

3. Trigger: inflammation or trauma

Plaque accumulation around the brackets, or traumatic brushing, converts anatomical vulnerability into attachment loss and marginal migration.

This three-stage model explains why recession sometimes appears during treatment but also later, in the retention phase: the bony dehiscence that has been created persists and remains a sensitive site for years after debonding.

Key concept

It is not orthodontics in itself that causes recession, but moving a root out of its bony corridor on a thin and inflamed periodontium. Prevention therefore acts on three levers: keeping movement within the bony envelope, thickening an unfavorable phenotype, and controlling inflammation.

Risk factors

Identifying risk factors — before and during treatment — drives the entire preventive strategy. They fall into anatomical, biomechanical and patient-related categories.

Thin phenotype

Translucent gingiva through which the probe is visible; low tissue thickness. The primary vulnerability factor.

Narrow keratinized tissue

Reduced band of attached gingiva (< 2 mm), no barrier against trauma and inflammation.

Pre-existing dehiscence / fenestration

Thin or already deficient buccal bone plate, common at mandibular incisors and canines.

Mandibular incisor proclination

Increased IMPA and buccal tipping: the movement most frequently associated with recession.

Arch expansion

Excessive buccal expansion of the posterior segments driving roots against a thin cortical plate.

Pre-existing recession

Any recession already present may worsen under the combined effect of movement and inflammation.

High frenal attachment

Labial or lingual frenum pulling on the marginal gingiva, especially where keratinized tissue is insufficient.

Inadequate plaque control

Poor hygiene around the appliance, converting anatomical vulnerability into attachment loss.

The most closely watched movement

Mandibular incisor proclination remains the movement most often correlated with recession in the literature. Any plan involving a marked increase in IMPA on a thin phenotype should trigger a prior periodontal assessment.

Preventive diagnosis: angles and measurements

Prevention is decided at the diagnostic stage. The goal is not merely to record the periodontal status but to quantify the risk: to set the intended tooth position (cephalometric angles) against the available anatomical reserves (periodontal and bony measurements). A movement that is "safe" on a thick periodontium becomes hazardous on a thin one — only the measurements can settle the question.

4.1 — Cephalometric angles of the mandibular incisor

The mandibular incisor is the epicenter of risk. Three parameters are measured on a lateral cephalogram: the baseline value (T0), the value targeted by the plan, and above all the change imposed by treatment (Δ).

Parameter	Definition	Reference norm	Caution threshold
IMPA	Long axis of the incisor / mandibular plane (Go-Me)	90° ± 5 (Tweed); up to ~95°	Final IMPA > 95° caution
ΔIMPA	Treatment-induced change in IMPA (T1 − T0)	—	Proclination ≥ 10° high risk
L1-NB (angle)	Lower incisor / Na-B line	25°	> 25° = buccal tipping
L1-NB (distance)	Incisal edge / Na-B line	4 mm	Increase = buccal advancement
FMIA	Incisor / Frankfort plane (Tweed triangle)	65°	Decrease = proclination

The 10° rule

Proclining the mandibular incisor by 10° or more (relative to the Go-Me plane) significantly increases the risk of recession, particularly lingual — an approximately 17-fold increase in the work of Antonarakis et al. A plan imposing a ΔIMPA ≥ 10° on a thin periodontium should prompt reconsideration of the mechanics (extraction, anchorage, an alignment compromise) or trigger a preventive graft.

An important caveat

Proclination per se is not a strong, consistent predictor at population level: several cohorts (including Morris & Buschang) found no significant excess of recession beyond an IMPA of 95°. The real danger arises from the combination: marked proclination + thin buccal bone + thin phenotype + inflammation. This is why angles are never read in isolation, but always against the periodontal and bony measurements below.

4.2 — Periodontal and bony measurements

The anatomical determinant of recession is the bony dehiscence: without loss of buccal bone support, recession does not occur. Three measurements objectify the fragility of a site before any movement.

Measurement	Method	Unfavorable threshold	Interpretation
Gingival thickness (GT)	Probe transparency (transgingival/TRAN method) or direct measurement	≤ 1 mm / probe visible through gingiva thin	Thin phenotype = first-order vulnerability
Keratinized tissue width (KTW)	Marginal gingiva to mucogingival junction	< 2 mm insufficient (cut-offs ~2.2–2.7 mm reported)	Weak barrier against trauma and traction
Crestal buccal bone (LBT-crest)	CBCT, cortical thickness at the crest	< 1 mm (cut-off ~0.7 mm reported) thin	Risk of dehiscence under buccal movement

The transparency (TRAN) test

A periodontal probe is inserted into the buccal sulcus: if its metallic outline is visible through the marginal gingiva, the phenotype is thin (≤ ~1 mm). This is the simplest and most reproducible chairside screening step, requiring no additional equipment.

4.3 — Chairside assessment protocol

Phenotype measurement

Probe transparency test (TRAN) at each at-risk site. Record gingival thickness (thin if ≤ 1 mm) and keratinized tissue width (insufficient if < 2 mm).

Predictive cephalometric analysis

On the lateral cephalogram: baseline IMPA, L1-NB and FMIA, then estimate the ΔIMPA the plan will impose. Any plan with ΔIMPA ≥ 10° or final IMPA > 95° is classified "at risk."

Mapping of existing recessions

Site-by-site charting per the Cairo classification (RT1/2/3) with reference photographs. Essential documentation for objective follow-up and medico-legal traceability.

Assessment of inflammation

Plaque and bleeding indices. Active gingivitis must be resolved before bonding: never band an inflamed periodontium.

Targeted bony analysis (CBCT)

For the "at-risk" cases flagged at step 2: measure buccal cortical thickness (LBT-crest thin if < 1 mm) and identify pre-existing dehiscences and fenestrations. CBCT is not routine but reserved for these situations.

Frena and traction examination

Identify high frenal attachments pulling on the marginal gingiva, set against the available keratinized tissue.

The logic of preventive diagnosis

Risk is read not from a single figure but from the crossover of angle (planned movement) and measurement (anatomical reserve):

Favorable angle + thick periodontium → safe movement, simple monitoring.
ΔIMPA ≥ 10° or IMPA > 95° + GT ≤ 1 mm or bone < 1 mm → high-risk site: revise the mechanics or graft first.
Documented bony dehiscence at a site to be moved buccally → preventive graft mandatory.

Orthodontics–periodontics coordination

A joint orthodontist–periodontist consultation is ideal for cases quantified as "at risk," formalized by a sequencing decision: disinfection, possible preventive graft, then appliance placement.

Planning within the bony envelope

Biomechanical prevention means keeping roots within their bony corridor. It is the first line of defense, before any surgical consideration.

Limiting high-risk movements

Controlled incisor proclination: restrain the increase in IMPA, especially on a thin phenotype. Sometimes prefer strategic extractions or skeletal anchorage over excessive compensatory proclination.
Reasoned expansion: distinguish skeletal expansion (sutural, by disjunction in a growing patient) from purely dentoalveolar expansion, which carries greater risk of driving roots against the cortical plate.
Cautious buccal root torque: avoid pressing the root against a thin bone plate.

Bone protection strategies

In borderline cases, some approaches aim to create or preserve bone around the moved root: surgically assisted techniques (corticotomy-assisted orthodontics with particulate buccal bone grafting) or "decelerated" orthodontics respecting biology. These options fall within a multidisciplinary decision.

The pitfall

Trying to "align everything" through expansion and proclination to avoid extractions, on a patient with a thin phenotype and thin cortical plates.

The fix

Assess the bony envelope on CBCT, accept an alignment compromise or resort to extraction/anchorage, and plan a preventive graft if buccal movement remains essential.

Plaque control during treatment

The fixed appliance is a plaque trap. At an anatomically vulnerable site, inflammation is the final trigger of recession. Biofilm control is therefore a preventive pillar in its own right.

Initial education and motivation

Demonstration of a brushing technique adapted to the appliance, interdental brushes and an orthodontic brush. Brushing must be effective yet non-traumatic at thin sites.

Targeted chemical adjuncts

Chlorhexidine (CHX) mouthrinse as a short course during acute inflammatory phases, with no chronic use because of staining. Daily fluoride solutions for peri-bracket caries prevention.

Close periodontal maintenance

Scaling and re-evaluation at shorter intervals than in the general population throughout treatment, with systematic re-check of the at-risk sites mapped at baseline.

Traumatic brushing

Vigorous horizontal brushing with a hard brush worsens recession on a thin phenotype. Recommend a soft brush and a gentle technique, and correct traumatic habits from the initial assessment.

In the Algerian setting, chlorhexidine mouthrinse (generic CHX, Bétadine mouthwash) and fluoride toothpastes are widely available. Interdental and orthodontic brushes should be explicitly prescribed, as their spontaneous use remains uncommon.

Preventive mucogingival surgery

When the phenotype is unfavorable and buccal movement is unavoidable, thickening the phenotype before the movement is the most robust preventive strategy. The terrain is modified so it can support the movement.

Indications for a preventive pre-orthodontic graft

Very thin phenotype combined with planned buccal movement at the site.
Insufficient keratinized tissue (< 2 mm) with frenal or muscular traction.
Documented bony dehiscence at a site to be moved buccally.
Incipient recession likely to worsen under treatment.

Techniques

Subepithelial connective tissue graft (CTG)

The reference for thickening the phenotype and increasing keratinized tissue while preserving esthetics. Preferred in visible anterior segments.

Free gingival graft (FGG)

Reliably increases keratinized tissue height. Less favorable esthetic result, more suited to the posterior mandibular segment or non-visible zones.

Timing

The preventive graft is ideally performed before appliance placement, or failing that before the phase of buccal movement involving the site. The thickened tissue then protects the root throughout displacement.

Algerian setting

Access to a periodontist and a surgical facility remains concentrated in major urban centers and the private sector. For at-risk cases, anticipating referral and sequencing is essential, as the availability of an operator trained in periodontal plastic surgery is not uniform across the country.

Monitoring and interception

During treatment, monitoring the mapped sites allows an incipient recession to be intercepted before it becomes established.

Regular photographic re-check

Comparison with the reference images at at-risk sites, at every periodontal re-evaluation.

Early warning sign

A thinning marginal band, slight cemental exposure, root sensitivity, or persistent inflammation localized to a thin site.

Interception decision

Faced with a beginning recession: slow down or redirect the buccal movement, intensify plaque control, and consider a graft before worsening.

Early interception, at an RT1 stage with no interproximal loss, offers the best prognosis for stabilization — and even partial spontaneous coverage if the root can be repositioned within its bony corridor.

Managing established recession

Once recession is established, the decision depends on the Cairo type, the patient's demand and the stage of treatment.

Phase 1 — Decision and stabilization

Identify the cause (movement, trauma, inflammation), correct it, and stabilize the periodontium. A stable, asymptomatic RT1 recession may simply be monitored.

Phase 2 — Root coverage

For RT1 (and selected RT2) recessions that are esthetically bothersome or symptomatic, periodontal plastic surgery offers a good prognosis:

Coronally advanced flap (CAF) + subepithelial connective tissue graft — the gold standard of coverage.
Tunnel technique + connective tissue for multiple recessions.

Phase 3 — Maintenance

Whatever the procedure, durability depends on inflammation control, cessation of brushing trauma and regular periodontal maintenance. Orthodontic retention must be compatible with effective hygiene.

RT3 and interproximal loss

When there is interproximal attachment loss (RT3), complete coverage is not predictable. The objective becomes stabilization and management of sensitivity rather than full esthetic coverage.

Practical summary

The seven preventive reflexes

Systematically examine the periodontal phenotype before any expansion or proclination plan.
Map and photograph recessions and at-risk sites before bonding.
Resolve any inflammation before banding.
Plan the movement within the bony envelope (CBCT in borderline cases).
Thicken the phenotype by grafting before buccal movement on an unfavorable site.
Control plaque throughout treatment, with close maintenance.
Monitor, intercept early, and coordinate orthodontics with periodontics.

Frequently asked questions

Does orthodontics always cause recession? →

No. The mean population effect is small. Recession occurs mainly at individually vulnerable sites — thin phenotype, thin cortical plate, buccal movement and inflammation. It is this combination that must be screened for and prevented.

Should grafting be done before or after orthodontics? →

For a site with an unfavorable phenotype that will undergo buccal movement, a preventive graft before the movement is the most robust strategy: it protects the root throughout displacement. An already established recession, on the other hand, can be treated after stabilization.

Is a CBCT mandatory for every patient? →

No, it is reserved for at-risk cases: marked expansion or proclination, thin phenotype, suspected dehiscence. Clinical examination of the phenotype and keratinized tissue remains the first-line filter.

Can chlorhexidine be prescribed continuously during treatment? →

No. CHX is used in short courses during inflammatory episodes, because of staining and taste alteration with prolonged use. Long-term prevention rests on mechanical control and fluoride.

References

meta-analysisJoss-Vassalli I, et al. Orthodontic therapy and gingival recession: a systematic review. Orthod Craniofac Res. 2010.
reviewRenkema AM, et al. Gingival recessions and the change of inclination of mandibular incisors during orthodontic treatment. Eur J Orthod. 2013.
classificationCairo F, et al. The interproximal clinical attachment level to classify gingival recessions. J Clin Periodontol. 2011.
consensusJepsen S, Caton JG, et al. Periodontal manifestations of systemic diseases and developmental/acquired conditions — World Workshop 2017/2018. J Clin Periodontol. 2018.
reviewWennström JL. Mucogingival considerations in orthodontic treatment. Semin Orthod. 1996.
reviewBollen AM, et al. The effects of orthodontic therapy on periodontal health: a systematic review. J Am Dent Assoc. 2008.
reviewCardaropoli D, Gaveglio L. The influence of orthodontic movement on periodontal tissues level. Semin Orthod. 2007.
cohortAntonarakis GS, et al. Gingival recessions of lower incisors after proclination by orthodontics — a 10° limit beyond which lingual recession risk increases. 2017.
reviewMorris JW, Campbell PM, Tadlock LP, et al. Prevalence of gingival recession after orthodontic tooth movements (IMPA ≥ 95°). Am J Orthod Dentofacial Orthop. 2017.
studyCut-off values for KTW and crestal buccal bone thickness (LBT-crest) associated with post-orthodontic recession. BMC Oral Health. 2026.