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GINGIVAL RECESSION: ETIOLOGY, PATHOLOGY, PREVALENCE AND MANAGEMENT

Post-Graduate University Theory Examination Answer (50 Marks)

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SECTION I: DEFINITION AND CLASSIFICATION (3 marks)

• Class I: Marginal tissue recession not extending to the mucogingival junction (MGJ); no loss of interdental bone or soft tissue. Complete root coverage predictable.
• Class II: Marginal tissue recession extending to or beyond the MGJ; no loss of interdental bone or soft tissue. Complete root coverage predictable.
• Class III: Recession extending to or beyond MGJ; loss of interdental bone/soft tissue or tooth malposition. Only partial coverage expected.
• Class IV: Recession extending to or beyond MGJ; severe loss of interdental bone/soft tissue or severe tooth malposition. Root coverage not predictable. (Miller 1985, cited in Wennstrom & Zucchelli, Lindhe Chapter 46)

• RT1: Buccal tissue recession with no loss of interproximal attachment.
• RT2: Buccal tissue recession with interproximal attachment loss less than or equal to buccal attachment loss.
• RT3: Buccal tissue recession with interproximal attachment loss greater than buccal attachment loss. (Cairo et al. 2011, cited in Wennstrom & Zucchelli, Lindhe Chapter 46)

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SECTION II: ETIOLOGY OF GINGIVAL RECESSION (10 marks)

• Trauma-induced (mechanical/iatrogenic)
• Bacterial (plaque-induced) (Zucchelli, "Etiology of Gingival Recession," uploaded reference)

A. Trauma-Induced Gingival Recession

• The most common cause is damage induced by brushing, either due to an unsuitable brushing technique or use of hard-bristled brushes.
• Main features: abraded or ulcerated, usually painless soft tissue lesions and/or cervical hard tissue abrasion.
• Soft tissue trauma may lead to ulcerous destruction of the entire keratinized tissue zone.
• Traumatizing toothbrushing and tooth malposition are the factors most frequently associated with marginal tissue recession (Sangnes 1976; Vekalahti 1989; Checchi et al. 1999; Daprile et al. 2007, cited in Lindhe).
• Use of hard toothbrushes is associated with higher prevalence of recession (Khocht et al. 1993, cited in Lindhe). (Zucchelli, Etiology reference; Wennstrom & Zucchelli, Lindhe Chapter 46)

• Mechanical trauma to tooth surfaces after onset of recession.
• Affects both crown (enamel) and root cementum/dentin.
• May make it impossible to locate the CEJ, complicating treatment planning.
• Abraded area appears darker due to dentin exposure; crown and root dentin are chromatically indistinguishable. (Zucchelli, Etiology reference)

• Incorrect flossing - pulling floss into soft tissue rather than gliding over convex interproximal surface - causes narrow fissure-like gingival lesions (Stillman clefts).
• These were historically attributed to occlusal trauma, but there is no scientific proof of this causal relationship.
• Clefts may remain incomplete (confined to keratinized tissue) or become complete (extending to MGJ), at which point pockets form in alveolar mucosa. (Zucchelli, Etiology reference)

• Intraoral and perioral piercing causes gingival lesions resembling clefts, most commonly in the mandibular incisor region.
• Lip studs cause labial gingival recession; tongue jewelry causes lingual recession.
• Narrow cleft shape prevents adequate hygiene; bacterial superinfection spreads lesion toward apex.
• Lingual lesions may spread rapidly to the floor of the mouth, compromising tooth vitality. (Zucchelli, Etiology reference)

• Labial tooth movement may create areas of bone dehiscence, the path of least resistance for onset of recession.
• Continued labial movement may tear soft tissues, causing cleft-like lesions.
• Orthodontic treatment may act as an etiologic factor (direct bone dehiscence/root movement outside buccal bone wall) or as a predisposing factor (tooth malposition + thin gingiva + brushing trauma).
• Tooth malposition in buccal dislocation, related brushing trauma, and bacterial superinfection all contribute to extensive areas of deep recession.
• Melsen & Allais (2005) found gingival inflammation and thin gingival biotype as significant predictors for recession during orthodontic therapy.
• Yared et al. (2006) reported 93% of teeth developing recession had gingival thickness <0.5 mm. (Zucchelli, Etiology reference; Wennstrom & Zucchelli, Lindhe Chapter 46)

• Occlusal trauma (precontacts, parafunction) is NOT a causal factor for gingival recession.
• No scientific documentation proves a cause-effect relationship.
• Exception: deep bite cases where incisal edges of maxillary anterior teeth directly traumatize facial gingival margin of mandibular anteriors ("traumatic occlusion"). (Zucchelli, Etiology reference)

• Frenal or muscle attachments encroaching on marginal gingiva can distend the sulcus, creating an environment for plaque accumulation.
• This increases the rate of periodontal recession and contributes to recurrence after treatment.
• More common on facial surfaces but may also occur lingually. (Takei, Scheyer et al., Carranza Chapter 65)

• Related to restorative and periodontal treatment procedures (Lindhe & Nyman 1980; Valderhaug 1980, cited in Lindhe).
• Subgingival restorative margins, improper prosthetic preparation.

B. Bacterial/Inflammatory Recession

• Generalized forms of destructive periodontal disease cause recession not only at facial aspects but also at proximal sites (Wennstrom & Zucchelli, Lindhe).
• An inflammatory lesion developing in response to subgingival plaque in thin, delicate gingiva can engage the entire connective tissue portion, leading to proliferation of epithelial cells and subsidence of the epithelial surface, clinically manifesting as recession (Baker & Seymour 1976, cited in Lindhe).
• Resolution of periodontal lesions following treatment (surgical or non-surgical) causes apical shift of the soft tissue margin.

• Thin or absent buccal bone plate predisposes to recession.
• Roots covered with thin bony plates pose a hazard in mucogingival surgery; even minimally invasive partial-thickness flap creates risk of bone resorption on the periosteal surface (Takei et al., Carranza Chapter 65).
• Alveolar bone dehiscences are a recognized local predisposing factor (Bernimoulin & Curilivic 1977; Lost 1984, cited in Lindhe).

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SECTION III: PATHOLOGY OF GINGIVAL RECESSION (4 marks)

• Type 1 - Mechanical factors: Predominantly toothbrushing trauma. Clinically healthy gingiva with abrasion defects on exposed roots.
• Type 2 - Inflammatory: In areas where alveolar bone is thin or absent (dehiscence) and gingival tissue is thin. Plaque-induced inflammatory lesion engages entire connective tissue. Epithelial proliferation from oral and dentogingival epithelium causes subsidence of epithelial surface = recession.
• Type 3 - Generalized periodontal disease: All tooth surfaces affected; proximal sites involved; more pronounced at single-rooted teeth than molars.

• In thin, delicate gingiva, the entire connective tissue portion can be destroyed by inflammatory infiltrate.
• Proliferation of epithelial cells into the degraded connective tissue causes a subsidence of the epithelial surface.
• This clinically manifests as recession of the tissue margin (Baker & Seymour 1976, cited in Wennstrom & Zucchelli, Lindhe Chapter 46).
• The thickness of the marginal soft tissue (not the width/height) is the determining factor for recession development, particularly during orthodontic movement (Wennstrom et al. 1987, cited in Lindhe).

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SECTION IV: PREVALENCE OF GINGIVAL RECESSION (3 marks)

• Marginal tissue recession is a common feature in populations with high standards of oral hygiene (Sangnes & Gjermo 1976; Murtomaa et al. 1987; Loe et al. 1992; Serino et al. 1994, cited in Lindhe).
• In these populations, loss of attachment and marginal tissue recession are predominantly found at buccal tooth surfaces and frequently associated with wedge-shaped defects in the crevicular area.

• Also common in populations with poor oral hygiene (Baelum et al. 1986; Yoneyama et al. 1988; Loe et al. 1992; Susin et al. 2004, cited in Lindhe).
• In periodontally untreated populations, all tooth surfaces are affected, with higher prevalence and severity at single-rooted teeth than at molars (Loe et al. 1978; Miller et al. 1987, cited in Lindhe).

• Recession in young individuals is predominantly associated with toothbrushing trauma.
• Periodontal disease is the primary cause in older adults.
• Cross-sectional data shows correlation between recession depth and reduced gingival height, but this is likely a consequence, not a cause of recession (Wennstrom & Zucchelli, Lindhe Chapter 46).

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SECTION V: FACTORS AFFECTING SURGICAL OUTCOME (3 marks)

• The difficulty in locating the anatomical CEJ in teeth with recession and local factors limiting root coverage necessitates a method to predetermine the root coverage line.
• This "clinical CEJ" (cCEJ) represents the level of Maximum Root Coverage (MRC) achievable with mucogingival surgery. (Zucchelli 2006, Journal of Periodontology 77(4), cited in "Predetermining Root Coverage" reference)

• The CEJ point angle (CPA) is the point where the CEJ intersects the facial line angle.
• Ideal papilla height (X) = distance between mesial or distal CPA and the contact point.
• MRC is plotted by projecting ideal papilla height vertically (apically) from anatomical papilla tips and projecting horizontally onto the gingival margin. (Zucchelli 2006, cited in Factors Influencing reference)

• Level of interdental periodontal support is of greatest significance.
• Residual flap tension significantly reduces root coverage: sites without tension achieved 87% coverage vs 78% at sites with tension (Pini Prato et al., cited in Lindhe).
• For 100% predictability of complete root coverage in Miller class I recessions, the flap margin must be positioned at least 2 mm coronal to the CEJ at time of suturing (Pini Prato et al. 2005, cited in Lindhe).
• Graft thickness of ~2 mm is recommended for free graft procedures (Borghetti & Gardella 1990, cited in Lindhe).

• Poor oral hygiene negatively influences success (Caffesse et al. 1987, cited in Lindhe).
• Toothbrushing technique must be corrected prior to surgery.
• Smoking: treatment outcome is usually less favorable in smokers (Trombelli & Scabbia 1997; Zucchelli et al. 1998; Martins et al. 2004, cited in Lindhe).

• Labially tilted or rotated teeth have thinner labial bone, leading to recession.
• Orthodontic correction is indicated before mucogingival surgery on malposed teeth. (Takei, Scheyer et al., Carranza Chapter 65)

• Pedicle flap has better blood supply than a free graft.
• Bilaminar techniques (sandwich-type) maximizing blood supply from both the cover flap and recipient periosteal bed give the best predictability (Takei et al., Carranza Chapter 65).

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SECTION VI: PRINCIPLES OF MANAGEMENT OF GINGIVAL RECESSION (2 marks)

• Esthetic/cosmetic demands (most common).
• Root sensitivity.
• Improving topography for plaque control. (Wennstrom & Zucchelli, Lindhe Chapter 46)

• Surgical site free of biofilm, calculus, and inflammation.
• Meticulous scaling, root planing, and biofilm removal before any surgery.
• Thorough scaling and root planing must precede surgery; inflamed, edematous tissue does not permit meticulous precise incisions and flap reflection (Takei et al., Carranza Chapter 65).
• Correction of brushing technique is mandatory.

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SECTION VII: CLASSIFICATION OF ROOT COVERAGE PROCEDURES (3 marks)

1. Rotational flap procedures: Laterally sliding flap, double papilla flap, oblique rotated flap.
2. Advanced flap procedures: Coronally repositioned flap, semilunar coronally repositioned flap.
3. Regenerative procedures: Above + GTR barrier membrane or enamel matrix proteins.

1. Epithelialized free gingival graft (two-stage or single-stage).
2. Free connective tissue graft:
   • Combined with coronally advanced flap (bilaminar technique).
   • "Envelope" technique.
   • "Tunnel" technique.

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SECTION VIII: BILAMINAR TECHNIQUES FOR SINGLE RECESSION DEFECTS (8 marks)

• Bilaminar techniques = root coverage surgical techniques comprising a connective tissue graft (CTG) partially or totally covered with a pedicle flap.
• Primary aim: improve root coverage predictability compared to free gingival grafting, due to further blood supply from the cover flap.
• Secondary aim: improve esthetic outcome by hiding the white scar appearance and uneven MGJ typical of post-healing epithelium-connective tissue grafts. (Zucchelli, "Bilaminar Techniques for Single Recession Defects," uploaded reference)

• (A) Original bilaminar technique (CTG partially covered - original design, now considered suboptimal).
• (B) CAF + CTG coronal to CEJ - indicated when camouflage of prosthetic/implant metal margin or pigmented root is needed.
• (C) CAF + CTG at the CEJ - standard technique for most single recession defects.
• (D) CAF + CTG apical to CEJ - variation when augmentation of tissue apical to recession is primary aim. (Zucchelli, Bilaminar Techniques reference)

• The CTG must always be covered entirely by the pedicle flap.
• Complete coverage: (i) maximizes blood supply from the cover flap; (ii) optimizes esthetic outcome by reducing risk of graft exposure and avoiding white scar appearance.
• Since the graft is covered completely, it must be completely deepithelialized (= pure connective tissue graft).
• The most suitable cover flap is the coronally advanced flap (CAF). (Zucchelli, Bilaminar Techniques reference)

1. Apical or lateral keratinized tissue of inadequate quantity.
2. Need for gingival thickness augmentation.
3. Camouflage of prosthetic/implant metal borders or pigmented roots.
4. Single recession defects with insufficient adjacent gingival tissue for a pure CAF. (Zucchelli, Bilaminar Techniques reference)

• Flap design: Trapezoidal flap with two horizontal incisions 3 mm long at distance from anatomical papilla tips equal to recession depth + 1 mm; two diverging vertical incisions extending into alveolar mucosa.
• Flap elevation: Split-thickness elevation in the papilla area; full-thickness periosteal elevation over the denuded root, switching to split-thickness apical to bone level using knife parallel to bone plane; superficial muscle fibers cut to permit passive coronal repositioning.
• Root preparation: Mechanical debridement with curettes; conditioning with 24% EDTA for 2 minutes; pigmented endodontically treated roots may require more aggressive debriding.
• CTG dimensions: Mesiodistal width = recession width + 6 mm; height = recession depth + 1 mm; thickness >1 mm.
• CTG placement: Secured at CEJ with two interrupted sutures at base of papillae or two vertical mattress sutures.
• Flap advancement: CAF advances coronally to completely cover the CTG; interrupted sutures along releasing incisions; final sling suture anchored behind palatal cingulum. (Zucchelli, Bilaminar Techniques reference)

• In the original technique, the graft covered the entire periosteal bed lateral and apical to root exposure, creating an obstacle to vascular exchange between the cover flap and recipient bed.
• Flap stability depended entirely on vascular exchange between surgical papillae and deepithelialized anatomical papillae.
• Insufficient papilla height led to premature flap dehiscence and graft exposure.
• Post-healing appearance was similar to free gingival graft: white scar, uneven MGJ, "patchwork" appearance.
• Modification: graft only covers exposed root as far as buccal bone crest, leaving periosteum apical to dehiscence free to act as vascular bed for cover flap. (Zucchelli, Bilaminar Techniques reference)

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SECTION IX: MANAGEMENT OF SINGLE RECESSION IN DIFFERENT SEXTANTS (5 marks)

• Coronally Advanced Flap (CAF): Basic procedure for maxillary single recessions (Wennstrom & Zucchelli, Lindhe Chapter 46).
• Technique: trapezoidal flap with two horizontal and two diverging vertical incisions; split-full-split thickness elevation; de-epithelialization of adjacent papillae; sling suture coronally.
• If tissue quality apical to recession is inadequate: combine with CTG (bilaminar technique).
• Laterally Moved, Coronally Advanced Flap (for cases with sufficient adjacent tissue): vertical incision 3 mm from lateral edge; split-thickness pedicle from adjacent tooth; rotated 45° and secured. (Wennstrom & Zucchelli, Lindhe Chapter 46)

• Coronally advanced flap remains the technique of choice for maxillary posterior teeth.
• The laterally moved coronally advanced flap is illustrated at the maxillary first molar for root sensitivity as indication (Wennstrom & Zucchelli, Lindhe, Fig. 46-37).
• If keratinized tissue apical to recession is inadequate in height, bilaminar CTG + CAF is indicated.

• In the mandible, thin mucosa apical to the recession and frequent presence of multiple frenula make the coronally advanced flap unsuitable as a standalone procedure.
• Preferred technique: Free CTG with "envelope" or "tunnel" preparation (Wennstrom & Zucchelli, Lindhe Chapter 46).
• Envelope technique:
  • Sulcular epithelium eliminated by internal beveled incision.
  • "Envelope" prepared apically and laterally to recession by split incisions, 3-5 mm depth in all directions, extending beyond MGJ.
  • CTG harvested using "trap-door" approach from palatal premolar region.
  • CTG inserted into envelope and positioned to cover exposed root.
  • Crossed sling suture may advance mucosal flap coronally.
• Tunnel technique: Similar subperiosteal tunnel preparation without vertical incisions; CTG threaded through tunnel.
• For a localized single recession of moderate depth: rotational (lateral sliding) flap may be used if sufficient keratinized mucosa is available laterally. (Wennstrom & Zucchelli, Lindhe Chapter 46)

• Split-thickness flaps mobilized from both sides of recession (mesial and distal papillae).
• Sutured together over the exposed root.
• Illustrated for maxillary canine with single recession.
• Can be combined with a free CTG placed beneath the double papilla flap. (Wennstrom & Zucchelli, Lindhe Chapter 46; Fig 46-31, 46-44)

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SECTION X: CORONALLY ADVANCED ENVELOPE FLAP FOR MULTIPLE RECESSION DEFECTS (8 marks)

1. Permit treatment of recession defects on adjacent teeth in a single procedure.
2. Be effective and predictable in obtaining complete (where possible) root coverage of all defects treated.
3. Use existing gingival tissue near recession defects.
4. Maintain or augment marginal facial keratinized tissue.
5. Not leave unesthetic scarring.
6. Guarantee good color and thickness match.
7. Be minimally invasive with limited postoperative discomfort. (Zucchelli, "Coronally Advanced Envelope Flap for Multiple Recession Defects," uploaded reference)

• Described in Journal of Periodontology, 2000.
• Comprises two variations: (i) Lateral approach (originally described) - for recession defects affecting an entire quadrant (central incisor to mesial root of first molar), and (ii) Frontal approach - for simultaneous treatment of recession defects affecting central and lateral incisors of both sides of an arch.
• Choice of approach: When the canine has a recession depth ≥1 mm, the lateral approach is indicated. When recession mainly affects incisors with the canine healthy (or recession <1 mm), the frontal approach is used. If both sides have recession affecting incisors and canines, two lateral approaches are performed simultaneously. (Zucchelli, CAF for Multiple Recessions reference; Wennstrom & Zucchelli, Lindhe Chapter 46)

• Envelope flap type - NO vertical releasing incisions.
• The flap extension depends on the number of recession defects, type of tooth, and depth of recessions at mesial and distal ends.
• General rule: extend flap at both ends to include one tooth beyond the recession defect area.
• Exceptions:
  • Maxillary central incisor = always the most mesial tooth; flap never crosses to contralateral central.
  • First molar = always the most distal tooth; no need to extend to second molar.
  • If most mesial or distal tooth has shallow recession (1 mm): not required to extend to next healthy tooth. (Zucchelli, CAF reference)

• When the envelope flap is advanced coronally, all surgical papillae undergo not only coronal advancement but also a lateral shift - creating a rotational movement.
• In the lateral approach, the flap's axis of rotation nearly always passes through the center of the facial surface of the canine (the tooth in the area of natural arch curvature).
• Surgical papillae distal to the canine rotate distally; those mesial to the canine rotate mesially.
• Rotational factor increases toward mesial and distal extremities: coronal advancement decreases and lateral movement increases proportionally. (Zucchelli, CAF reference)

• Rather than a single continuous incision, the horizontal incision consists of a series of oblique paramarginal incisions in the interdental area.
• These are connected with intrasulcular incisions at the gingival margins mesial and distal to each recession.
• All oblique incisions converge toward the flap's axis of rotation (the canine facial surface).
• Each surgical papilla tip is designed at a distance from the anatomical papilla tip equal to recession depth + 1 mm.
• This ensures: when the gingival margin apical to the recession reaches a position 1 mm coronal to CEJ, the surgical papilla tips cover their corresponding anatomical papillae without keratinized tissue loss. (Zucchelli, CAF reference)

• Begin with incisions mesial and distal to the canine (the axis tooth).
• Canine recession depth + 1 mm plotted along distal margin of papilla mesial to canine AND mesial margin of papilla distal to canine = endpoints of oblique paramarginal incisions.
• Proceed to first premolar: recession depth + 1 mm plotted apically from papilla distal to first premolar.
• Then second premolar: recession depth + 1 mm from papilla distal to second premolar.
• Then lateral incisor: recession depth + 1 mm plotted along distal margin of papilla mesial to lateral incisor.
• For central incisor: apical sulcus left untouched; intrasulcular incision made along distal margin of interincisal papilla without reaching the tip (tip preserved as coronal peak for flap stabilization during suturing). (Zucchelli, CAF reference)

• No incision is made with the knife blade at the apical margin of recession defect (to avoid thinning keratinized gingiva apical to root exposure, which is used for root coverage).
• If probing depth apical to recession exists, periosteal elevator is inserted into sulcus to preserve entire facial gingival thickness.
• Split-thickness dissection at the interdental areas.
• Full-thickness flap elevation apical to root exposures (to preserve maximum soft tissue thickness for root coverage).
• Periosteum incised at most apical portion of flap followed by dissection into vestibular lining mucosa to eliminate all muscle tension.
• Flap must passively reach a level coronal to the CEJ at each single tooth in the surgical field. (Zucchelli, CAF reference; Wennstrom & Zucchelli, Lindhe)

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SECTION XI: MANAGEMENT OF MULTIPLE RECESSIONS BY SEXTANT (5 marks)

• Used when recession affects central and lateral incisors of both sides with canine healthy or recession <1 mm.
• Envelope flap without vertical incisions, extending across the midline.
• If quality of mucosa apical to recessions is inadequate: CAF combined with placement of a CTG (Lindhe).
• Bilaminar technique (CAF + CTG) suitable if keratinized tissue augmentation is simultaneously needed.

• When recession affects lateral incisor (≥2 mm), canine, first premolar, second premolar (≥2 mm): flap extends from central incisor to furcation area of first molar.
• When all six teeth (central incisor to second premolar ≥2 mm) are affected: flap from central incisor to first molar furcation.
• When recession involves mesial root of first molar: flap extends from central incisor to distal root of first molar. (Zucchelli, CAF reference - all clinical scenarios documented)

• CAF described by Zucchelli & De Sanctis (2000) is also applied to the mandible with anatomical modifications.
• Thin mucosa, short vestibule, and multiple frenula in the mandible require careful flap elevation.
• When mucosa apical to recessions is thin or inadequate: CTG placed via tunnel technique beneath the advancing flap (bilaminar approach).
• Envelope/tunnel technique with CTG is the preferred approach for multiple shallow mandibular anterior recessions (Wennstrom & Zucchelli, Lindhe).

• Posterior mandibular recessions are treated with rotational flaps when keratinized tissue of sufficient dimensions is available lateral to recession.
• For multiple posterior mandibular recessions: connective tissue graft via envelope or tunnel preparation is preferred over pure pedicle flap due to thin mucosa and lack of adjacent donor tissue.
• GTR with bioresorbable membrane may be used as an adjunct; however, membrane exposure during healing remains a problem and does not improve outcomes vs CAF alone (Trombelli et al. 1995; Chambrone et al. 2009, cited in Lindhe).
• Adjunctive CTG or enamel matrix proteins with CAF show estimated mean absolute improvement of 15-25% for complete root coverage vs CAF alone (Cairo et al. 2008; Chambrone et al. 2009; Buti et al. 2013, cited in Lindhe).

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SECTION XII: POSTSURGICAL CARE (2 marks)

• Mucogingival surgery seldom leads to postsurgical complications; patient morbidity is generally very limited.
• Potential complications: infection and hemorrhage.
• Palatal wound infection occurs more frequently in patients undergoing CTG in case of primary flap dehiscence or necrosis.
• To prevent infective complications, antibiotics are routinely prescribed for patients undergoing mucogingival surgery involving palatal grafts: 1g amoxicillin + clavulanic acid regimen.
• Facial surgical wound infections are extremely rare.
• Oral hygiene: Mechanical tooth cleaning is avoided during first 3-4 weeks; patients rinse twice daily with chlorhexidine solution as infection control method.
• When mechanical cleaning is re-instituted, instructions in a toothbrushing technique creating minimal apically directed trauma are given. (Zucchelli, "Postsurgical Medication and Oral Hygiene for Patients Undergoing Mucogingival Surgery," uploaded reference; Wennstrom & Zucchelli, Lindhe Chapter 46)

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SUMMARY REFERENCE TABLE

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