Orthodontics and Orthodontology Commons^™

Electromyographic Analysis Of The Temporal And Masseter Muscles During The Para-Retentional Period In Orthodontic Patients, Thomas L. Thompson

Loma Linda University Electronic Theses, Dissertations & Projects

This study was initiated to compare electromyographically the activity of the masseter and temporal muscles during the early retentional period in orthodontic patients. Electromyographic recordings were taken at the following times: (1) before typical edgewise appliance was removed, (2) at time of retainer insertion, (3) after eight to twelve weeks of retainer wearing, and (4) one day following occlusal equilibration. Electromyograms from the orthodontic group of subjects were compared with electromyograms from a group of subjects with normal occlusion, and a group of subjects with untreated Class II, Division 1 malocclusions. There was a total of thirteen subjects studied: five …

The Physiological Aspects Of The Piezoelectric Phenomenon And Its Application In Biologic Bone, Virgil V. Heinrich

Loma Linda University Electronic Theses, Dissertations & Projects

The relationship between stress and bony architecture has long been recognized, but the actual cellular machanism which causes the alteration is still somewhat vague. Piezoelectric properties and bioelectric potentials have been proposed as partial answers.

It is the purpose of this investigation to better understand and correlate the relationship of electric potentials or bioelectric potentials to the formation and transformation of physiologic bone.

It is very likely that the crystallites of bone possess the physical properties that would allow them to exhibit the piezoelectric phenomenon.

In the technique of this work a direct current and a pulsating current across the …

Occlusal Patterns And Tooth Morphology In The Navajo Indians Of Monument Valley, Utah, Leroy C. Trnavsky

Loma Linda University Electronic Theses, Dissertations & Projects

The occlusal patterns and morphology of the dentition of the Navajo Indians were studied and compared to those of populations of known Mongoloid ancestry. Thirteen dento-anthropomorphic characteristics were studied from plaster casts obtained from fifty-four Navajo Indians from the Monument Valley area of Utah. The thirteen characteristics included were:

1. Degree of shovel-shape of the maxillary centrals and laterals.
2. Presence of a winged appearance in the maxillary centrals.
3. Mesiodistal crown diameters of the maxillary centrals and laterals.
4. Type of lingual tubercle on the maxillary centrals and laterals.
5. Cusp pattern of mandibular molars.
6. Cusp pattern of maxillary molars.
7. Frequency of cusp of …

Masseter And Temporal Muscle Adaptability To Interproximal Contact Disruption : An Electromyographic Study, Robert E. French

Loma Linda University Electronic Theses, Dissertations & Projects

In this study an attempt was made to determine the amount of interproximal contact disruption necessary to initiate an electromyographically discernable deviation in the masticatory musculature. Ten adult subjects with adjudged normal occlusions were used. An additional study was under taken to determine the time necessary for the right and left temporal and masseter muscles to accommodate this disruption. Myographic recordings were taken of the subjects while closing firmly in centric occlusion and chewing Dentyne gum first on the right side, then on the left.

Contact disruption was accomplished with a metal shim of .003 inch thickness and later in …

A Cephalometric Evaluation Of The Navajo Indian, Robert L. Cole

Loma Linda University Electronic Theses, Dissertations & Projects

A random sampling of 54 Navajo Indians was examined and a selective group of 20 subjects presenting harmonious facial profiles and good occlusions were taken from this random sampling for specific comparison with Caucasian and other ethnic groups.

The methods used in this study are as follows: Plaster casts of Maxillary and Mandibular dental arches, profile photographs and lateral cephalometric X-rays. The cephalometric X-rays were traced in the standard manner on both Downs' and Riedel's analyses. The mean values for the Navajo group were compared with the mean values established for Caucasians by Downs and Riedel. The comparison was subjected …

The Incidence Of Dental Caries, Periapical Root Resorption, And Alveolar Bone Loss Among The Navajo Indians Of Monument Valley, Utah, Ronald J. Fasano

Loma Linda University Electronic Theses, Dissertations & Projects

In a pilot anthropometric study of 52 Navajo Indians of Monument Valley, Utah, the incidence of dental caries, permanent tooth periapical root resorption, and alveolar bone loss was assessed. The relationship of tooth malpositioning to the specific parameter was subsequently determined.

The sample was divided into arbitrary age groups.

Periapical roentgenograms were taken of each subject and were used in the assessment of dental caries, periapical root resorption, and alveolar bone loss. Data from a specially prepared examination sheet augmented the findings from the roentgenograms.

Tooth malpositioning and arch relationships were determined from the study casts. Occlusion was then classified. …