Kuwait Dental Board Periodontics key terms

A thin, non-keratinized epithelial band that attaches the gingiva to the tooth surface at the base of the sulcus. It forms the epithelial seal and is the first barrier breached in periodontitis.

The insertion of gingival collagen fiber bundles into cementum immediately apical to the junctional epithelium. Its loss, measured clinically as attachment loss, defines periodontal destruction more reliably than pocket depth alone.

The shallow crevice between the free gingival margin and the tooth surface, bounded apically by the junctional epithelium. In health it is generally 1-3 mm and contains gingival crevicular fluid and a commensal biofilm.

The combined supracrestal attachment of junctional epithelium and connective tissue fibers, averaging about 2 mm. It must be respected when placing restorative margins or crown lengthening to avoid chronic inflammation and recession.

A serum-derived transudate or inflammatory exudate that flows from the gingival sulcus. Its volume and biomarker content rise with inflammation, making it a research tool for detecting active periodontal disease.

A structured, surface-adherent microbial community embedded in an extracellular polymeric matrix. Its organized architecture confers antibiotic resistance and protects pathogens from host defenses, making mechanical disruption essential.

A shift in the resident microbial community from a health-compatible composition toward a pro-inflammatory one, driven by environmental changes such as plaque accumulation. It underlies the polymicrobial synergy and dysbiosis model of periodontitis.

A low-abundance organism that can remodel the whole microbial community and trigger disease disproportionate to its numbers. Porphyromonas gingivalis is the classic periodontal example in the polymicrobial synergy and dysbiosis model.

A grouping of three anaerobic bacteria, Porphyromonas gingivalis, Tannerella forsythia, and Treponema denticola, strongly associated with established periodontitis. The concept is historically influential but modern ecology views disease as polymicrobial.

The immune and inflammatory reaction of the patient to subgingival bacteria, including cytokine release, neutrophil recruitment, and matrix metalloproteinase activity. Most collateral tissue destruction in periodontitis results from this response rather than from bacterial enzymes directly.

Enzymes released by neutrophils, macrophages, and fibroblasts that degrade collagen and other extracellular matrix components. Their imbalance relative to tissue inhibitors of metalloproteinases drives connective tissue breakdown in periodontitis.

The distance in millimeters from the gingival margin to the base of the probeable sulcus or pocket. It is recorded at six sites per tooth and interpreted together with the gingival margin level to derive clinical attachment level.

The distance from a fixed reference point, usually the cementoenamel junction, to the base of the probeable pocket. It reflects cumulative attachment loss and is the primary measure of past periodontal destruction.

Bleeding elicited by gentle probing of the sulcus, recorded as a percentage of sites. Its absence is a strong predictor of stability, while persistent bleeding at deep sites signals elevated risk of progression.

The 2017 World Workshop classification framework. Staging describes severity and complexity of management using attachment loss, bone loss, and tooth loss; grading estimates rate of progression using risk indicators such as smoking and glycemia.

Apical displacement of the gingival margin beyond the cementoenamel junction, exposing root surface. It is recorded with its width and depth and may cause hypersensitivity, esthetic concern, or root caries.

Mechanical removal of plaque and calculus above and below the gingival margin, with planing of root surfaces to remove endotoxin and create a biologically compatible surface. It is the foundation of nonsurgical periodontal therapy.

A protocol completing scaling and root planing of all quadrants within 24 hours, combined with chlorhexidine rinsing, tongue cleaning, and irrigation. It aims to prevent reinfection of treated pockets from untreated sites.

A locally or systemically delivered antimicrobial or antiseptic used as an adjunct to mechanical debridement, such as chlorhexidine, doxycycline gel, or minocycline microspheres. Adjuncts never replace adequate debridement.

Pharmacologic alteration of the patient's inflammatory or immune response to reduce tissue destruction, for example subantimicrobial-dose doxycycline inhibiting matrix metalloproteinases. It is adjunctive and requires careful patient selection.

The clinical goal of therapy in which inflamed pocket depth decreases through resolution of edema, epithelial shrinkage, and connective tissue repair after debridement. Residual deep pockets with bleeding indicate need for further or surgical care.

Surgical elevation of a mucoperiosteal flap to allow direct visualization and thorough root debridement, followed by repositioning and suturing. It improves access but does not guarantee regeneration of lost attachment.

Placement of a barrier membrane over a debrided defect to exclude gingival epithelium and connective tissue, allowing slower periodontal ligament and bone cells to repopulate the wound. It aims for true regeneration rather than repair.

The epithelial lining that forms against the root surface after nonsurgical or surgical healing without new connective tissue attachment. It is a repair outcome, not regeneration, and is less resistant to further breakdown.

Reshaping of alveolar bone to reduce or eliminate osseous defects and restore physiologic bone contour. It reduces pocket depth at the cost of supporting bone height and is selected for specific defect morphologies.

Particulate or block material placed into a periodontal or peri-implant defect to provide a scaffold, osteoconduction, or osteoinduction. Autograft, allograft, xenograft, and alloplast differ in resorption and healing behavior.

Direct structural and functional connection between living bone and the surface of a load-bearing implant without intervening soft tissue. Achieved surface topography, primary stability, and controlled loading are key determinants.

Reversible inflammation confined to the soft tissue around an implant, characterized by bleeding on probing without progressive bone loss. It is the implant analog of gingivitis and is treated by biofilm control.

Inflammation of peri-implant mucosa with progressive loss of supporting bone beyond expected remodeling. Risk factors include poor plaque control, a history of periodontitis, and lack of maintenance; treatment is more demanding than for periodontitis.

A graft of subepithelial connective tissue, usually harvested from the palate, used to cover exposed roots or increase keratinized tissue. It is the reference standard for root coverage procedures.

A graft of epithelium and underlying connective tissue completely detached from its donor site, usually the palate, and sutured to a recipient bed. It predictably increases keratinized tissue but offers limited root coverage and esthetics.

Gingiva covered by orthokeratinized epithelium, extending from the mucogingival junction to the free gingival margin. A narrow band is associated with discomfort and recession risk, particularly around implants and restorations.

The clinically visible boundary between attached keratinized gingiva and alveolar mucosa. Its location is used to measure the width of attached gingiva and to plan mucogingival surgery.

The study of bidirectional relationships between periodontal disease and systemic conditions such as diabetes, cardiovascular disease, and adverse pregnancy outcomes. It informs risk assessment and interdisciplinary management.

A patient characteristic or exposure that increases the likelihood of disease onset or progression, such as smoking, poorly controlled diabetes, or genetic predisposition. It is modifiable or non-modifiable and shapes prognosis and treatment planning.

A structured evaluation combining probing depths, bleeding, tooth loss, bone loss, systemic status, smoking, and compliance to estimate the chance of future progression. It guides recall interval and intensity of maintenance.

Supportive periodontal therapy delivered at individualized intervals after active treatment, including reassessment, biofilm removal, and reinforcement of self-care. Its frequency is the strongest modifiable determinant of long-term tooth retention.

A study in which participants are randomly allocated to interventions, minimizing selection bias and supporting causal inference. It is the design of choice for evaluating periodontal therapies and is central to systematic reviews.

A structured synthesis that uses a predefined protocol to identify, appraise, and pool studies addressing a focused question. With meta-analysis it provides the highest level of evidence for clinical decisions.

A range of values likely to contain the true population effect, usually stated at 95 percent. Its width reflects precision, and intervals crossing no effect indicate a non-significant result.

The reciprocal of the absolute risk reduction, indicating how many patients must receive an intervention for one additional favorable outcome. It translates trial results into practical clinical effort.

Clinical decision making that integrates the best available research evidence, clinician expertise, and patient values and preferences. It requires formulating answerable questions and appraising study validity.

A patient's voluntary agreement to treatment after receiving adequate information about diagnosis, options, risks, benefits, and alternatives, and demonstrating capacity to decide. It must be documented and revisited when circumstances change.

The conduct expected of a clinician, including competence, honesty, respect for patient autonomy, confidentiality, and management of conflicts of interest. Breaches may attract regulatory or legal consequences.

Systematic documentation of history, examination findings, diagnoses, treatment, consent, and communications in a legible, contemporaneous, and secure record. It supports continuity of care and is the primary evidence in medico-legal disputes.

Standard precautions and procedures that prevent transmission of pathogens in dental settings, including hand hygiene, personal protective equipment, instrument sterilization, and surface disinfection. They apply to all patients regardless of known status.

A validated process that destroys all microorganisms including bacterial spores on instruments, typically by autoclave. It is distinguished from disinfection and must be monitored with biological indicators.