Vertical parallax radiology to localize an object in the anterior part of the maxilla

An evaluation has been made of four techniques of assessing, from radiographs, the position of unerupted maxillary teeth, using radio-opaque markers placed in various positions on the maxilla of a dried skull. Application of the parallax principle in a vertical plane, for which only two radiographs are needed, was found to produce as many correct conclusions as other methods.