Final answer:
Deciduous (primary) posterior restorations are common in adults and address issues in baby teeth by replacing the decayed or damaged part of a baby tooth with a dental filling.
Step-by-step explanation:
Deciduous (primary) posterior restorations are restorations that are common in adults and address issues in baby teeth. These restorations involve replacing the decayed or damaged part of a baby tooth with a dental filling. The purpose of these restorations is to prevent further decay and to maintain the stability and function of the tooth until the permanent tooth erupts.