Operative Dentistry 1 Comprehensive Review

Extension for Prevention

A historical concept by G.V. Black stating cavity margins should be moved away from proximal contact points and into self-cleansing zones (cleansed by the tongue, teeth, and saliva) to prevent recurrence of decay.

Conservation of Tooth Structure

The practice of minimizing tooth preparation to reduce biological trauma, maximize mechanical integrity, and improve long-term restorative outcomes through reduced microleakage and increased retention.

Protective Barrier Techniques

Infection control methods, such as plastic wraps and rubber dams, that act as an isolating boundary to prevent dental personnel and patients from contacting infectious materials.

Enamel Lamella

A thin, leaf-like structural defect containing organic matter that extends from the enamel surface toward the Dentinoenamel Junction (DEJ) and can act as a pathway for bacteria.

Dead Tracts

Empty dentinal tubules resulting from the death of odontoblasts due to trauma, attrition, or caries; they appear black under transmitted light.

Enamel Rod Orientation (Permanent Teeth)

Generally aligned perpendicularly to the tooth surface and DEJ, except at the cervical third where they incline slightly in an apical direction.

Amelogenin

The principal organic matrix protein responsible for directing the development and mineralization of enamel prisms.

Cementum

A completely avascular tissue that forms the outer covering of the root and receives nourishment from the periodontal ligament (PDL).

Dentinoenamel Junction (DEJ)

The most sensitive part of the tooth due to the dense branching of odontoblastic processes and concentration of nerve terminals at this interface.

Reparative (Tertiary) Dentin

Dentin rapidly produced by newly differentiated odontoblast-like cells in response to localized noxious stimuli, injury, or moderate-level irritants like caries.

Sclerotic (Transparent) Dentin

Dentin characterized by the calcification and obliteration of tubules with peritubular dentin, resulting from aging or mild irritation, giving a glass-like appearance.

Complex Class I Cavity

A cavity involving three surfaces (buccal, occlusal, and lingual) entirely restricted to the pits and fissures of a posterior tooth.

Streptococcus macacae

A specific non-human primate strain of bacteria isolated from dental plaque in monkeys, used in experimental animal caries studies.

Mount and Hume Classification 2.3

A categorization where Site $2$ corresponds to proximal contact areas and Size $3$ denotes an enlarged cavity that has significantly weakened tooth structures.

Body of the Lesion

The largest zone in enamel caries, showing the greatest degree of demineralization and making the surface porous.

Zone of Bacterial Invasion

A zone in dentin caries characterized by widened, distorted tubules filled with bacteria and irreversibly denatured collagen.

Micro-mechanical Bonding

An adhesion mechanism where fluid resin monomers flow into acid-etched microporosities and polymerize to form resin tags.

Acid Etchant

Typically $37\%$ phosphoric acid, used to create an irregular, high-energy surface by selectively dissolving enamel rod structures or removing the dentin smear layer.

Hybrid Layer

An interdiffusion zone formed by the infiltration of hydrophilic primer/adhesive monomers into the exposed, demineralized collagen network of dentin.

Adherend

The structural solid substrate material, such as enamel, dentin, metal, or ceramic, to which an adhesive is applied.

Outline Form

The final external shape and boundary path of the cavity preparation, based on the location and spatial configuration of the carious lesion.

Resistance Form

The shape and relationship of cavity walls designed to protect the tooth and restoration from fracture under masticatory forces.

Toilet of the Cavity