• Carranza's Clinical Periodontology, 10th Edition - Primary source for Box 71-1 classification, crown lengthening parameters, biologic width, ridge augmentation, pontic design, FGG healing, mucogingival/periodontal plastic surgery objectives and techniques
• Newman and Carranza's Clinical Periodontology and Implantology, 14th Edition - Updated SCTA terminology (formerly biologic width), quantified ridge resorption data (29-63% horizontal; 11-22% vertical), Chapter 66 rationale and sequence
• Essentials of Clinical Periodontology and Periodontics (S. Reddy) - Clark's vestibuloplasty steps, frenectomy/frenotomy distinction and types, crown lengthening objectives and technique selection criteria, papilla reconstruction techniques

1. The SCTA (Supracrestal Tissue Attachment) is the current terminology replacing "biologic width" - a frequently tested recent change
2. The four-category classification from Box 71-1 (Carranza's 10th Ed.) is the standard enumeration answer expected
3. Biologic width parameters (2 mm average, 3 mm minimum from margin to bone, 4 mm for caries/fracture cases, 0.5 mm safety zone) are commonly examined numeric values
4. The distinction between frenectomy vs. frenotomy and the four types of frenal attachments are short-answer favorites
5. Clark's vestibuloplasty steps and FGG healing stages with specific time points are frequently tested

LANDMARK RESEARCH ARTICLES: PRE-PROSTHETIC PERIODONTAL SURGERIES

MDS Periodontology Examination-Relevant Literature Review

CATEGORY 1: FOUNDATIONAL / CLASSIC PAPERS (Pre-PubMed Era — Must-Know for Examiners)

Paper 1

• Established the foundational measurements of the dentogingival junction: sulcus depth mean 0.69 mm, junctional epithelium 0.97 mm, connective tissue attachment 1.07 mm
• Total biologic width = ~2 mm (JE + CTA)
• Provided the biological rationale for all crown-lengthening procedures and the concept of minimum 3 mm from restorative margin to alveolar bone crest

Paper 2

• Introduced orthodontic forced eruption as a pre-prosthetic procedure
• Part I: demonstrated coronal movement of bone and soft tissue attachment with tooth extrusion, effectively eliminating infrabony defects
• Part II: extended to non-restorable teeth — extrusion moves the fracture/caries margin coronally so that crown lengthening or direct restoration becomes possible
• Established the concept that orthodontic tooth movement is an alternative/adjunct to surgical crown lengthening for biologic width management

Paper 3

• Introduced the term "mucogingival surgery" to describe surgical procedures for correction of relationships between the gingiva and the oral mucous membrane
• Defined three specific problem areas: attached gingiva, shallow vestibules, and a frenum interfering with the marginal gingiva
• Laid the conceptual framework later renamed "periodontal plastic surgery" at the 1996 World Workshop

Paper 4

• Proposed the term "periodontal plastic surgery" as a replacement for mucogingival surgery
• Broadened the scope to include: crown lengthening, ridge augmentation, root coverage, papilla reconstruction, esthetic surgical corrections around implants
• This terminology was officially adopted at the 1996 World Workshop in Clinical Periodontics

Paper 5

• Introduced the Seibert classification of ridge defects:
  • Class I: Buccolingual loss of tissue width, normal ridge height
  • Class II: Apicocoronal loss of tissue height, normal ridge width
  • Class III: Combination defect — loss of both height and width
• Described full-thickness onlay grafts for ridge reconstruction
• Established the relationship between ridge morphology and pontic design

CATEGORY 2: CROWN LENGTHENING — KEY CLINICAL STUDIES

Paper 6

• Immediately post-surgery: mean clinical crown length gained = 3.7 mm interproximally, 4.1 mm buccally/lingually
• Over 12-month healing: coronal rebound of the gingival margin = 3.2 mm interproximally, 2.9 mm buccally/lingually
• Net available tooth structure at 12 months: only 0.5 mm interproximally and 1.2 mm buccally/lingually
• Coronal rebound was more pronounced in "thick" tissue biotype
• Rebound was influenced by individual healing variation (not age or gender)

Paper 7

• Synthesized evidence on crown-lengthening rationale, surgical principles, contraindications, and wound healing
• Key clinical finding synthesized: average of 3 mm of supragingival soft tissue will rebound coronal to the alveolar crest post-surgery, requiring minimum 3 months to complete vertical growth
• Clinical implication: Final prosthetic treatment should wait at least 3 months; up to 6 months for esthetically important areas
• Addressed: ferrule length, biologic width establishment, indications for gingivectomy vs. apically positioned flap with osseous resection

Paper 8

• Addressed the four critical questions in esthetic crown lengthening: ideal flap design, amount of supporting bone to remove, position of flap margin relative to alveolar bone at surgical closure, and timing/position of provisional restoration during healing
• Described the concept of "crown lengthening in the esthetic zone" as distinct from posterior functional crown lengthening
• Discussed altered passive eruption as a specific indication
• Emphasized integration of provisional restoration position in managing gingival healing outcomes

CATEGORY 3: ALVEOLAR RIDGE PRESERVATION — KEY EVIDENCE

Paper 9

• First high-quality meta-analysis quantifying the benefit of ridge preservation after extraction
• Key findings: ARP effective vs. extraction alone with benefit of:
  • 1.89 mm horizontally (buccolingual)
  • 2.07 mm vertically (midbuccal)
  • 1.18 mm vertically (midlingual)
• Subgroup: flap elevation + membrane + xenograft/allograft associated with superior outcomes
• Confirmed ARP is effective in limiting physiologic ridge reduction

Paper 10

• Updated meta-analysis; 22 RCTs included; 9 different ARP treatment modalities identified
• Pooled result for ARP via socket grafting vs. extraction alone:
  • Horizontal: 1.99 mm (95% CI 1.54–2.44)
  • Vertical midbuccal: 1.72 mm (95% CI 0.96–2.48)
  • Vertical midlingual: 1.16 mm (95% CI 0.81–1.52)
• Sites with buccal bone thickness >1.0 mm showed markedly superior outcomes (3.2 mm difference vs. 1.29 mm in thin-walled sockets)
• Xenogenic or allogenic materials + absorbable collagen membrane/sponge associated with most favourable outcomes

Paper 11

• 16 RCTs, 524 extraction sites, 426 adult participants
• Quantified: xenograft ARP vs. extraction alone shows significant reduction in ridge width loss (MD -1.18 mm, 95% CI -1.82 to -0.54) and height loss (MD -1.35 mm, 95% CI -2.00 to -0.70)
• However: "very low certainty evidence" — did not find significant difference in need for additional augmentation before implant placement
• Key conclusion: ARP reduces dimensional change but does not eliminate the need for augmentation in all cases

Paper 12

• Primary outcome: horizontal bone preservation benefit = 1.86 mm (95% CI 1.44–2.28)
• Identified five clinical factors significantly affecting outcomes:
  1. Type of wound closure
  2. Type of grafting material
  3. Use of barrier membranes
  4. Use of growth factors
  5. Socket morphology (intact vs. compromised walls)
• Provided evidence hierarchy for material and technique selection in ARP

CATEGORY 4: MUCOGINGIVAL / FREE GINGIVAL GRAFT — LANDMARK PAPERS

Paper 13

• Introduced the free gingival graft (FGG) technique in its modern form
• Described the principles of plasmatic circulation, revascularization, and graft take
• Established three phases of FGG healing: initial plasmatic circulation → revascularization (Day 2–3) → organisational phase
• Demonstrated FGG as a reliable method for widening attached gingiva

Paper 14

• Introduced the subepithelial connective tissue graft (SCTG) — the "gold standard" of root coverage and attached gingiva augmentation
• Described harvesting of a connective tissue graft from the palate placed beneath a partial-thickness envelope flap
• Advantages over FGG: superior esthetics (color match), protection of donor site, ability to cover wider and deeper recessions
• Applicable as a preprosthetic procedure around future abutment teeth and implants

CATEGORY 5: RIDGE AUGMENTATION FOR PONTIC/IMPLANT — ADDITIONAL LANDMARKS

Paper 15

• Described staged (two-stage) ridge augmentation before implant placement
• Demonstrated that adequate ridge volume should be established before implant surgery rather than simultaneously in severely deficient ridges
• Supported the concept that predictability of bone formation is better in horizontal than vertical ridge augmentation
• Contributed to the framework for pre-prosthetic hard tissue site development

Paper 16

• Confirmed the mean biologic width of ~2 mm but, critically, reported a range of 0.75 mm to 4.3 mm between individuals
• Demonstrated that biologic width is patient-specific and not uniform
• Established the need for individual "sounding to bone" assessment for each patient before restorative treatment
• Showed that some patients can have biologic width violations even when margins are >2 mm above alveolar bone

QUICK REFERENCE SUMMARY TABLE

EXAMINER'S EXPECTED CITATION PAIRS