Mark W Johnston

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The purpose of this study was to determine whether anterior and inferior displacement of the maxilla seen with rapid palatal expansion when done with a banded rapid palatal expansion appliance is significantly different from an occlusally bonded rapid palatal expansion appliance. It was hypothesized that the bonded appliance would limit unwanted(More)
Computerized video imaging techniques that enable superimposition of cephalometric radiographs and tracings on the image of the soft tissue profile are presented. This superimposition allows visualization of the underlying skeletal and dental hard tissues as they relate to the profile and permits surgical planners to be more cognizant of the limitations(More)
With the advancements of computer knowledge today, treatment planning and counseling are becoming more efficient by means of video imaging. Using a video image of a patient, esthetic and functional decisions can be made by the surgeon, orthodontist, and patient in a consensus manner. Distortion characteristics of video hardware, software, and the video(More)
Diagnostic treatment planning of Class III malocclusion is complicated due to the interaction of development, timing, dental pattern, and skeletal relationships. Historically, the treatment of adult Class III malocclusions has tended to be seen primarily as cases of mandibular prognathism. As diagnostic acumen and surgical skills improve and merge,(More)
Computerized video imaging is a valuable adjunct for communication with patients and planning orthognathic surgical treatment. The incorporation of adjunctive soft tissue procedures to enhance the final aesthetic result of orthognathic surgery is a valuable addition to the orthodontic and orthognathic treatment plan. This paper presents the use of video(More)
Ethical decision making in sales organizations has been explored using a variety of approaches. A review of personal selling and sales management literature reveals that research has mainly focused on individual and organizational factors that influence ethical decision making (McClaren 2000). Individual factors include gender, age, education, job tenure,(More)
It has previously been established that there is a significant history of thyroid disorders in families of patients with Hashimoto's struma or chronic thyroiditis. In the present study, 99 relatives of 20 patients with Hashimoto's struma or chronic thyroiditis were studied with regard to the incidence of circulating thyroid autoantibodies; 42 of these 99(More)