Biomedical subjects

G A Bruder

Publications and source records attributed to G A Bruder.

3 recordsLinked to original sources

PubMed1999

Alteration of computer dental radiography images.

This study was designed to determine if digital images stored on the hard drive of a Schick computer dental radiography system could be exported, altered, and then restored to the drive without any visible signs of alteration. Digital images were downloaded from the computer dental radiography system using an I-Omega Zip Drive, 100-MB capacity, and then opened in Corel Photo Paint where images were altered and manufacturer export symbols were edited. The resulting images were printed to a default printer (Fargo Foto Fun). The ease of manipulation of the exported digital images reflects the need for the manufacturer to implement safeguards so that the integrity of digital imaging cannot be compromised. Computer dental radiography has many advantages: conservation of time (instant radiographs), less radiation (50 to 60%), no chemical waste, and many viewing options. However, questions that might be raised regarding the ability of persons with minimal computer expertise, using a commercially available program to alter images should be addressed.

Computer Security↗

PubMed1999

Perforation repairs.

Management of instrument perforations in the periodontal ligament space during endodontic or restorative procedures is an ongoing problem in dentistry. The introduction of microscopes, new instruments and materials has resulted in more controllable and predictable surgical and nonsurgical outcomes. This paper discusses some of the newer techniques and materials used to manage perforations effectively.

Aluminum Compounds↗

PubMed1978

Role of visual familiarity in the word-superiority effects obtained with the simultaneous-matching task.

Three experiments assessed the effect of visual familiarity of words on same-different reaction times (RTs) in a simultaneous-matching task. Visual familiarity was disrupted by using upper- and lowercase letters within sequences. The results for same judgments in Experiments 1 and 2 indicated that visual familiarity was responsible for most of the large word-superiority effect obtained. The third experiment investigated the extent to which the effects obtained with word-frequency and orthographic-regularity manipulations were due to visual familiarity. For same RTs the results indicated both types of familiarity effects were dependent on visual familiarity. With pure-case stimuli, high-frequency words were processed faster than low-frequency words. Low-frequency words and orthographically regular nonwords produced similar reaction times, and both were processed faster than unpronounceable nonwords. These effects were not evident with mixed-case stimuli. All three studies showed visual familiarity to be responsible for differences in slope over sequence length between words and nonwords. Results with different judgments were dissimilar enough from the pattern of results for same judgments to present problems of interpretation, and it was suggested that additional or alternative processes were involved. The implications of these data for models of word processing were discussed.

Awareness↗