Final answer:
The most appropriate index to measure dental caries on this child is the Decay, Missing, Filled Teeth (DMFT) Index. Other indices mentioned, such as the Plaque Index, Gingival Index, and Periodontal Index, are used to assess different aspects of oral health.
Step-by-step explanation:
The most appropriate index to measure dental caries on this child is the Decay, Missing, Filled Teeth (DMFT) Index. This index measures the prevalence of dental caries by counting the number of decayed, missing, and filled teeth in a specific population.
Other indices mentioned, such as the Plaque Index, Gingival Index, and Periodontal Index, are used to assess different aspects of oral health, such as plaque accumulation, gingival inflammation, and periodontal disease.
However, for specifically measuring dental caries, the DMFT Index is the most appropriate choice.