NBDHE key terms

The band of collagen fibers and connective tissue that anchors each tooth's cementum to the surrounding alveolar bone, cushions chewing forces, and carries sensory signals about bite pressure.

The terminal portions of periodontal ligament collagen bundles that calcify as they insert into cementum on one side and alveolar bone on the other, holding the tooth in its socket.

The boundary where coronal enamel meets root cementum. It serves as the fixed reference point for measuring clinical attachment and becomes visible when gingival recession occurs.

The shallow space between the free gingival margin and the tooth surface, typically 1 to 3 mm deep when healthy; its depth and bleeding tendency are assessed during periodontal probing.

An organized community of bacteria attached to tooth surfaces and embedded in a self-produced polysaccharide matrix; it is the primary cause of caries and inflammatory periodontal disease.

Mineralized plaque that forms above or below the gingival margin. Its rough, porous surface retains biofilm and cannot be removed by toothbrushing, requiring professional instrumentation.

The part of the maxilla and mandible that forms the tooth sockets and supports the roots; it resorbs when periodontal inflammation destroys attachment.

The hard, acellular outer layer of the crown, made mostly of hydroxyapatite crystals. Because it has no living cells, mineral lost to acid cannot be replaced by the tooth itself.

The dissolution of calcium and phosphate from tooth mineral when acids produced by plaque bacteria lower the local pH; it can be reversed if minerals are restored before the surface collapses.

The pH at which plaque fluid becomes unsaturated with respect to tooth mineral, about 5.5 for enamel; below this value demineralization outpaces remineralization.

The millimeter distance from the gingival margin to the base of the sulcus or pocket, recorded with a periodontal probe; it does not by itself show how much attachment has been lost.

The distance from the cementoenamel junction to the base of the pocket, calculated from probing depth and the position of the gingival margin; it measures cumulative periodontal support loss.

Bleeding elicited by gently probing the sulcus, recorded as a sign of active gingival inflammation; its consistent absence suggests periodontal stability.

Attachment loss extending into the space between the roots of a multirooted tooth, graded I through IV according to how far a probe can penetrate beneath the crown.

Nonsurgical periodontal therapy that removes biofilm and calculus from crown and root surfaces and smooths the root, usually done by quadrant and often with local anesthesia.

An area-specific hand instrument with a curved blade offset from the shank, designed to remove subgingival deposits from a particular tooth surface; only the lower edge is sharpened to cut.

A hand instrument with a triangular, pointed blade and two cutting edges per tip, intended for removing heavy supragingival calculus; it is not designed for subgingival use.

Continuing professional care after active periodontal therapy, with recall intervals set by risk, including reassessment, deposit removal, and reinforcement of home care.

A structured review of disease indicators and risk factors, such as existing caries, diet, fluoride exposure, and salivary flow, used to plan preventive and restorative treatment.

A concentrated fluoride lacquer painted on tooth surfaces that adheres briefly and releases fluoride over hours, used to prevent caries and reduce root sensitivity.

An injection near the mandibular foramen that anesthetizes the inferior alveolar nerve, numbing mandibular teeth, lip, and chin on one side; it is the most common mandibular block.

The highest amount of a drug, such as a local anesthetic, that may be safely given to a patient, based on body weight and health status; exceeding it can cause toxicity.

Infection-control measures applied to every patient regardless of diagnosis, including hand hygiene, gloves, masks, eye protection, and safe handling of sharps and contaminated items.

A process that destroys all microorganisms, including bacterial spores, on reusable instruments; steam autoclaving is the most common method in dental offices.

The number of new cases of a condition arising in a defined population during a stated period. It measures the risk of developing the disease.

The proportion of a population that has a condition at one point in time or during a period, counting both new and existing cases; it reflects total disease burden.

The proportion of people who truly have a condition and are correctly classified as positive by a test; a highly sensitive test produces few false negatives.

The proportion of people who do not have a condition and are correctly classified as negative by a test; a highly specific test produces few false positives.

An experimental study in which participants are randomly assigned to treatment or control groups, reducing bias and allowing the strongest causal inference among study designs.

An observational study that follows exposed and unexposed groups over time and compares how often outcomes occur; it can estimate relative risk but is open to confounding.

An observational study that compares people with a disease to similar people without it, looking back at past exposures; efficient for rare diseases but vulnerable to recall bias.

A range computed from sample data that is likely to contain the true population value, with the confidence level stated; a narrower interval indicates a more precise estimate.

A summary count of decayed, missing, and filled permanent teeth for an individual or population; the lowercase dmft version is used for primary teeth.

A framework holding that people adopt a health behavior when they perceive themselves as susceptible, believe the condition is serious, see benefits, face few barriers, and receive a cue to act.

Indirect protection against an infectious disease that arises when a large share of a population is immune, so transmission chains break and unimmunized people are less exposed.

The conditions of daily life, including income, education, housing, food security, and access to care, that shape health and explain differences between population groups.

Adjusting the fluoride level of a community water supply to the concentration that best prevents caries, about 0.7 mg/L in the United States.