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Biomedical subjects

E O Williams

Publications and source records attributed to E O Williams.

18 recordsLinked to original sources
PubMed1994

Common errors in panoramic radiography of edentulous patients.

PURPOSE: Instructions for patient positioning during panoramic radiography usually describe positioning dentate patients, and errors in patient positioning are commonly identified by distortion of the dentition. The purposes of this study were to identify common errors in panoramic radiography of edentulous patients, describe the image distortions that can be expected with positioning errors in edentulous patients, and review quality assurance methods that improve the diagnostic value of panoramic films. MATERIALS AND METHODS: Panoramic films were randomly selected from the inactive files of 75 edentulous patients seen at the dental school for complete denture construction. The radiographs were numbered and reviewed by a board-certified oral and maxillofacial radiologist trained to identify errors in panoramic radiography. RESULTS: Of the 75 panoramic radiographs examined, only 6 films (8.0%) were free of errors, and 67 films (89.3%) had one or more errors in patient positioning and 33 films (44.0%) had one or more technical errors. The most common positioning errors were positioning the chin too high (32 films, 41.3%) and positioning the patient too far forward (26 films, 34.7%). CONCLUSIONS: Without modification, manufacturer's instructions for positioning dentate patients during panoramic radiography may result in positioning errors on the panoramic radiographs of edentulous patients. Proper training and appropriate attention to detail while exposing and developing panoramic films are required to ensure maximum diagnostic benefits for edentulous patients.

Chin↗
PubMed1992

Panoramic radiographs: necessary for edentulous patients?

With recent concern about the cumulative effects of radiation exposure, routine radiographic examination of edentulous patients is being questioned. While the present study reports a lower incidence of positive findings than previous panoramic surveys, we still find potentially complicating conditions. Radiographic examination of new edentulous patients still appears warranted.

Female↗
PubMed1989

Olfaction through oral tracheal breathing tube.

Cancer of the larynx has approximately a 90% cure rate if detected early. Advanced lesions are treated surgically by removing the larynx and creating a stoma that joins the trachea. Although speech can be learned, the patient's ability to smell is permanently interrupted. This technique article describes fabrication of a simple device that permits olfaction by a laryngectomee.

Equipment Design↗
PubMed1989

Implant transfer coping verification jig.

Osseointegrated implants provide a treatment modality that should be considered for the edentulous and partially edentulous patient because of the high predictability of success. This technique article describes the fabrication of a verification jig that holds the transfer copings together in the same spatial relationship. The transfer copings can be splinted on the working cast and returned to the mouth to confirm the accuracy of the working cast.

Dental Abutments↗
PubMed1989

Stabilized record base for maxillary removable partial denture obturator.

Accurate maxillomandibular jaw relation records are enhanced by a stabilized framework used to support the occlusal rim and recording medium. Stability of the framework is often lost on the defect side because of the size of the surgical defect and/or number of missing teeth. This article introduces a technique that uses a record base stabilized with a soft resilient material that permits easy removal and replacement of the framework on the altered master cast without damage.

Acrylic Resins↗