Preclinics of Conservative Dental Medicine · MU Sofia
4. Practical application of cavity preparation principles – accessing the carious lesion and removal of carious dentin.
Covers how to open a carious lesion through enamel until the dentino-enamel junction is clean all round, then how to remove carious dentin. It sets out the layers of a dentin lesion in a table, the hardness-based judgement of dentin (soft, leathery, firm, hard), and the contrast between selective and non-selective removal with stepwise options for deep lesions. It closes with instruments, the order of excavation and a list of typical mistakes.
Topic 4 of 53 in the MU Sofia syllabus for Preclinics of Conservative Dental Medicine (Dental Medicine, Year 3). The free AceMed note covers it in 8 sections, about 1,462 words (11 min of reading), with 17 flashcards.
In this note
Introduction
Where these steps fit
Accessing the carious lesion
The dentin lesion: what to remove
How much to remove: selective and non-selective removal
Instruments and technique of excavation
Typical mistakes and their consequences
Key points
Introduction
Two steps take the operator from the tooth surface to the bottom of the lesion: access – opening the carious lesion through enamel – and removal of carious dentin, also called excavation or, in many European textbooks, necrectomy (necrectomia, removal of softened, dead dentin). They decide whether all active caries is reached, whether the restoration seals and whether the pulp stays vital.
Where these steps fit
In Black's sequence the outline, resistance, retention and convenience forms are cut first, and removal of the remaining carious dentin opens the final stage (topic 1). Many European schools describe the same work as opening of the carious cavity → extension → necrectomy → shaping → finishing of the margins → toilet of the cavity. In both, caries deeper than the ideal depth is removed afterwards, and only where it is.
Leaving the deepest caries to the end gives a full view of the lesion, and any exposure then happens in a clean, isolated cavity. When pulp involvement or restorability is in doubt, caries is removed early to decide the treatment.
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