Cavity preparation in permanent teeth is often slightly different to that carried out in deciduous teeth. Which one of the following may occur during cavity preparation in a deciduous tooth only?

During cavity preparation in deciduous teeth, incomplete removal of deep caries may occur due to the unique characteristics of primary teeth. Deciduous teeth have thinner enamel and dentin compared to permanent teeth, which makes them more susceptible to pulp exposure when deep caries are aggressively removed. Additionally, the deep decay in primary teeth can be more closely monitored, as these teeth are expected to be replaced by permanent ones relatively soon. Therefore, dentists may opt to leave some carious tissue to minimize the risk of pulpal exposure or to preserve tooth structure, relying on the natural process of the tooth eventually exfoliating.

In contrast, the processes involved with administration of local anaesthetic, use of temporary filling material, and use of glass ionomer are not restricted to deciduous teeth and can also be applied in treating permanent teeth. Local anaesthetic is employed based on the patient's needs and comfort rather than the tooth type, while temporary fillings and glass ionomer materials are used in both pediatric and adult dentistry for various reasons, such as managing deep caries or providing a base for restorative procedures. Thus, the distinctive feature of cavity preparation in deciduous teeth is the tendency for incomplete removal of deep caries, reflecting a more conservative approach to treatment.