An ontology-based method for secondary use of electronic dental record data.

A key question for healthcare is how to operationalize the vision of the Learning Healthcare System, in which electronic health record data become a continuous information source for quality assurance and research. This project presents an initial, ontology-based, method for secondary use of electronic dental record (EDR) data. We defined a set of dental clinical research questions; constructed the Oral Health and Disease Ontology (OHD); analyzed data from a commercial EDR database; and created a knowledge base, with the OHD used to represent clinical data about 4,500 patients from a single dental practice. Currently, the OHD includes 213 classes and reuses 1,658 classes from other ontologies. We have developed an initial set of SPARQL queries to allow extraction of data about patients, teeth, surfaces, restorations and findings. Further work will establish a complete, open and reproducible workflow for extracting and aggregating data from a variety of EDRs for research and quality assurance.

Human cremation in Mexico 3,000 years ago.

Mixtec nobles are depicted in codices and other proto-historic documentation taking part in funerary rites involving cremation. The time depth for this practice was unknown, but excavations at the early village site of Tayata, in the southern state of Oaxaca, Mexico, recovered undisturbed cremation burials in contexts dating from the eleventh century B.C. These are the earliest examples of a burial practice that in later times was reserved for Mixtec kings and Aztec emperors. This article describes the burial contexts and human remains, linking Formative period archaeology with ethnohistorical descriptions of Mixtec mortuary practices. The use of cremation to mark elevated social status among the Mixtec was established by 3,000 years ago, when hereditary differences in rank were first emerging across Mesoamerica.