This class represents a dental treatment plan or the results of a dental examination. It is equivalent to VistA File 228.2. In order to accomodate the need to transmit this information using HL7 version 2 messages, this class represents only one observaton or plan-element "transaction" at a time. For example, filling of two teeth during an encounter would result in two instances of this class - one per tooth. Thus one instance is designated the "master" transaction, and any others will point to it.