Medicine and Health Sciences Commons^™

An Analysis Of Orthodontic Treatment Results, William S. Asano

Loma Linda University Electronic Theses, Dissertations & Projects

A study of orthodontic treatment results was made on forty patients treated by the graduate students Loma Linda University. The purpose of the study was to determine the treatment changes in patients treated in the graduate clinic. The study was based on the findings of the cephalometric and full mouth radiographs. The distribution of the malocclusions were similar to those found in other studies. The group of forty patients was divided for paired comparisons of type of malocclusion, length of treatment, and extraction of teeth. Statistical correlations were computed on every change investigated in this study.

The Steiner Analysis and …

The Piezoelectric Effect Of Bone In Vitro, Lloyd E. Gauntt

Loma Linda University Electronic Theses, Dissertations & Projects

The mechanism of bone deposition and resorption, under stress, is incompletely understood. The direct piezoelectric properties of bone have been suggested as playing an active role in the internal morphology of bone tissue.

This study was designed to fabricate an apparatus and develop a technique to measure, quantitatively, the direct piezoelectric effect of the crystallites of bone.

In vitro studies were done with bone samples taken from bovine femur. The samples were subjected to stress loading and were observed to exhibit a pressure-induced electrical phenomenon. The amplitude of the potentials generated was dependent upon the magnitude of the bony deformation. …

Development Of A Positioning Device For Use In Conjunction With Panoral Radiography, Ray M. Hymer

Loma Linda University Electronic Theses, Dissertations & Projects

A cephalometric positioning device has been developed for use on the XRM Panorex X-Ray machine. Tests have demonstrated that the variability in producing serial radiographs with this device is comparable to, or less than, that currently accepted in conventional radiographic cephalometry.

Two procedures for obtaining serial radiographs were employed. Two patients were used for the first procedure and three patients were used in the second procedure.

In the first procedure each patient was positioned in the device and two radiographs were taken in sequence without disturbing the patient.

In the second procedure three clinic patients were used as subjects and …

Mayo Dental Morphology, Val K. Artress

Loma Linda University Electronic Theses, Dissertations & Projects

The Mayo Indian of Sonora, Mexico, was selected for a study of dental morphology. The objectives of the investigation were to determine the extent to which the Mayo conformed to the four criteria of the Mongoloid dental master pattern, and to compare eight other specific tooth morphologic characteristics with like studies on Mongoloid and non-Mongoloid peoples. Plaster casts were made on a sample of forty-one Mayos.

The results of the study indicate that Mayos exhibit a 46 percent frequency of shovel-shape maxillary incisors, classifying "moderate shovel" and "shovel" together. The maxillary central-lateral width difference of 1.5 mm is small compared …

Mandibular Resting Posture : An Electromyographic Evaluation, Carroll L. Bright

Loma Linda University Electronic Theses, Dissertations & Projects

Mandibular resting posture is the positional expression of cranial-facial morphology and the myotatic reflex of its contiguous musculature.

Alteration of sensory input to the main sensory, mesencephalic and motor nucleus of the Fifth nerve in a myotalic reflex system, theoretically should result in changes or alteration in motor response.

The purpose of this study was then to examine post interference phenomena as noted by amplitude variations within muscles during centric occlusion and cyclic chewing and to block its expression via mandibular nerve anesthesia.

A Faraday cage was utilized to completely enclose the experimental subject and a 5P5 polygraph was used …

A Cephalometric Comparison Of The Chamula, Mayo And Navajo Indians, Norman C. Bunker

Loma Linda University Electronic Theses, Dissertations & Projects

Lateral head x-rays were obtained on selected samples of 24 Chamula, 29 Mayo and 39 Navajo Indians for cephalometric comparison.

Cephalometric evaluation was carried out by means of the Bjork analysis. Mean values for each of the Indian groups were determined and compared with each other and with the mean values of a group of Swedish conscripts studied by Bjork. The mean values were statistically analyzed and and subjected to the Student's "t" test to determine the significant levels of differences.

Results revealed that in comparing the three Indian groups significant differences do appear. They are few and general concordance …

The Facial Complex Of The Mayo Indian: A Radiographic Cephalometric Study, David G. Webster

Loma Linda University Electronic Theses, Dissertations & Projects

In order to investigate the characteristics of the facial complex of the Mayo Indian and to make comparisons between the facial complex of the Mayo Indian and the facial complex observed in other ethnic groups, measures of facial angles and linear relationships were obtained from a group of Mayo Indians in the state of Sonora, Mexico.

A simple of thirty subjects, seventeen boys and thirteen girls, with a mean age of 18.3 years was selected for this study. The criteria for selection was based on the integrity of the dental arches, occlusion and tooth morphology. Plaster casts and cephalometric x-rays …