Dentistry Commons^™

Determination Of Lead Content In Apical Tissue Following Root Canal Obturation With Sargenti's Formula, G. Merle Hickok

Loma Linda University Electronic Theses, Dissertations & Projects

Four Stump-tail monkeys were used to help determine if the lead in Sargenti's formula diffuses out into the apical tissue while confined entirely within the root canal. In each animal two teeth were filled with Sargenti's formula 1-2 millimeters short of the radiographic apex, and two teeth were filled with gutta percha and Proco-Sol sealer for controls, making a total sample size of sixteen. The time ranged from 48 hours to 120 days. Lead analysis using the spectrophotometric method showed a higher lead content in the teeth filled with Sargenti's formula than with the gutta percha controls.

Growth Augmentation With Activators, John R. Sibley

Loma Linda University Electronic Theses, Dissertations & Projects

This research was performed to determine if bony changes could be effected by activator treatment and how stable this treatment is.

From a sample of twenty-seven cases with before activator treatment cephalometric radiographs. Rocky Mountain Data Systems provided growth projections, with and without edgewise treatment, for the period of time each patient was in treatment. These forecasts were compared to the post-treatment cephalograms to analyze the orthopedic effects of activator treatment with normal growth and with edgewise therapy.

Nine of the twenty-seven case treated sample responded to recall for post-treatment cephalograms and were analyzed for relapse.

It was apparent that …

The Uses Of Pins For Retention In Restorative Dentistry : An Independent Learning Program, Ali M. Asad

Loma Linda University Electronic Theses, Dissertations & Projects

Although pins have been used since the 1800's for retention of dental restorations, their widespread use had been limited because supporting techniques such as impression, die materials, better handpieces and drills have only been perfected in the last two decades.

The pin technique allows for greater retention of restorative materials which otherwise might require considerable reduction of sound tooth substance; this is particularly paramount when insufficient coronal tooth structure is present. Also, the placing of pins in divergent directions gives excellent retention. Pin-retained castings reduce the need for deep cavity preparation in some cases.

Pins are useful in stabilizing hypermobile …

Commencement Program 1975-B (School Of Dentistry), Loma Linda University

Commencement Programs

CONTENTS

2 | Dentistry Class of 1975-B

3 | Program

4 | The Pledge

An Analysis Of Blood Cortisol Levels In Oral Surgery Patients Under Various Levels Of Intravenous Medication, Fred L. Bunch

Loma Linda University Electronic Theses, Dissertations & Projects

This study was designed to objectively evaluate each pharmacological component of the Loma Linda intravenous sedation technique. The results were evaluated as a function of stress as measured by plasma cortisol levels.

The study was conducted on fifty patients in groups of ten. Blood samples were taken at set procedure intervals during dental extraction of third molar teeth. A component of the Loma Linda technique was deleted from each of the groups to ascertain its role in sedation and relief of stress.

Results show a trend toward reduction of plasma cortisol levels as the procedure progresses, indicating a measure of …

Commencement Program 1975, Loma Linda University

Commencement Programs

CONTENTS

2 | 1975 Events of Commencement

3 | Conferring of Degrees

7 | Candidates for Degrees

25 | Awards

26 | Academic Costume

29 | Waymarks

A Clinical Comparison Of The Effectiveness Of Two Intracanal Medicaments, Xp-7/Prednisolone And 1% Pcp/Prednisolone, In Reduction And Duration Of Post-Treatment Pain, Kenneth G. Whitnack

Loma Linda University Electronic Theses, Dissertations & Projects

This study was undertaken to determine which intracanal medication, 1% aqueous parachlorophenol with prednisolone or XP-7 with prednisolone was the most effective in reducing the severity and duration of post-treatment pain following initial, conventional endodontic therapy. The investigation was conducted by five endodontists in their private offices and utilized a double-blind technique.

The postoperative reactions of 343 patients were examined statistically. It was shown that there was no statistically significant difference in the reduction or duration of post-treatment pain with either drug. Other factors such as sex, age, location of tooth and presence of a radiographic lesion were statistically significant …

A Computerized Study Of The Behavior Of The Facial Axis During Treatment And Post-Retention, Gary Cornforth

Loma Linda University Electronic Theses, Dissertations & Projects

A computerized cephalometric study of mandibular rotation was made of one hundred and eight patients that were treated by Drs. Ricketts and Bench of Pacific Palisades, California. These treated cases are on file at Rocky Mountain Data Systems in Sherman Oaks, California. The Ricketts computerized cephalometric analysis was utilized with each case.

Chin behavior during treatment and post-retention has always been of considerable interest to the clinical orthodontist and it was therefore decided to divide the patients into four groups according to the behavior of the chin during treatment and post-retention. Group 1 consisted of those patients that experienced a …

Developing A Periodontal Screening Examination, Jeffrey R. Morgulis

Loma Linda University Electronic Theses, Dissertations & Projects

Periodontal disease is the primary cause of tooth loss in the adult, and therefore, early diagnosis of periodontal disease by the general practitioner is important in terms of prevention as well as treatment. The present study was designed to develop a periodontal screening examination which would fulfill the following requirements:

1. It should utilize precise and easily understood criteria.
2. It should take a short period of time.
3. It should enable the practitioner to accurately place patients into various disease categories.
4. It should enable the practitioner to easily and quickly relate these disease categories to treatment.

A "comprehensive" periodontal examination was performed …

The Effect Of Chlorhexidine Or Oxytetracycline Irrigation On The Subgingival Microbiota, George M. Whitehead

Loma Linda University Electronic Theses, Dissertations & Projects

Inflammation of the connective tissue adjacent to the periodontal pocket may depend on the continuous presence of bacteria. Following periodontal treatment, subgingival plaque accumulation may interfere with healing. The purpose of this study was to determine the effect of irrigation with chlorhexidine or oxytetracycline on the cultivable bacteria in standardized chronic periodontal pockets in dogs. Chronic periodontal pockets were irrigated with either 5 ml. of 2 percent chlorhexidine or 250 mg. of oxytetracycline in 5 ml. distilled water. The pockets were irrigated dally for two days and were sampled on the first, fourth, seventh, fourteeth, twenty-first, thirty-fifth and forty-second days …

A Cephalometric Study Of Post-Retention Relapse In Mandibular Expansion Of Cuspids And Molars, Randall J. Schuler

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this research was to determine if the advancements of cephalometrics and the capacity of the computer to quantify skeletal relationships could help the orthodontist recognize those cases where arch length could be gained through buccal expansion with little risk of relapse. To determine the stability of orthodontic treatment changes, the mandibular arches of 72 patients were studied. The cases were treated by Drs. Bench and Ricketts and were selected on the basis that each case must include three complete sets of frontal and lateral headplates, before and after treatment, and a minimum of two years out of …

An Evaluation Of A Precipitation Hardened Stainless Steel Alloy As An Alternate To Chrome Cobalt Alloys For Orthodontic Purposes, Joseph M. Caruso

Loma Linda University Electronic Theses, Dissertations & Projects

The intent of this paper was to evaluate a precipitation hardenable stainless steel (Alloy I) as an alternate to chromium cobalt alloys (Alloy II) for orthodontic purposes.

After evaluating several heat treatments of alloy I it was determined that solution treatment produced a wire that was soft initially and had similar properties found with alloy II. After solution treatment of alloy I a 330 gram load was required to deform the wire 1.0 mm which proved to be similar to the 295 gram force required for alloy II for the same deformation and only an 11% increase in resistance of …

An Evaluation Of The Cytotoxicity Of Root Canal Filling Materials On Tissue Culture Cells In Vitro: Grossman's Sealer, N2 Permanent, Rickert's Sealer, And Cavit, Donald D. Antrim

Loma Linda University Electronic Theses, Dissertations & Projects

An in vitro study using radioactively-labeled tissue culture cells was conducted over a seven-month period on Grossman's sealer, Rickert's sealer, N₂ Permanent, and Cavit to determine the lasting and relative tissue toxicity of these materials.

From this study it was observed that all materials possess lasting tissue toxicity. When relative toxicity is considered, Grossman's is the most toxic, followed by N₂, Rickert's and Cavit in descending order of toxicity. Both Grossman's and N₂ would be considered highly toxic, with Rickert's displaying moderate toxicity. Cavit would be considered mild to moderate in toxicity.

The use of radioactively-labeled …

A Correlation Study Of Selected Teeth By Circumferential Measurement, Steven W. Campbell

Loma Linda University Electronic Theses, Dissertations & Projects

A correlation was established among the circumferences of teeth in a given set. This is the first step in constructing a band numbering system so that the fitting of one band (the predictor tooth) would give you the band sizes for the remaining teeth in the set. This would make possible improved efficiency for the orthodontist during band selection.

Individual sets of teeth from impressions of patients starting orthodontic treatment were measured by the use of the dentometer. The upper second bicuspid was chosen as the predictor tooth after the correlation matrices were computed.

It was concluded that 48% of …

A Post-Retention Study Of The Stability Of Lower Incisors Evaluated Cephalometrically, Robert W. Allen

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this research was to determine if forward movement of the lower incisor in a horizontal plane during active treatment affected the post-retention stability. The post-active treatment position of the lower incisor in relation to APo plane, NB plane and mandibular plane was also studied to determine if it affected the post-retention stability.

To determine where the lower incisors were moved during treatment, the beginning cephalometric tracings were superimposed over the end of active treatment tracings on the Corpus Axis at Supra-Pogonion. The amount of change in the incisal edge was measured to the nearest millimeter on a …

The Development Of A Means Of Applying Extraoral Pressure To The Buccal Arch Positioner, David C. Hobson

Loma Linda University Electronic Theses, Dissertations & Projects

A problem common to all of the full-banded orthodontic techniques currently in use is the delivery of an optimum force to each tooth without disrupting the forces on other teeth. This problem becomes especially acute during finishing. It arises out of Newton's third law, which states that for every action, there is an equal and opposite reaction. Thus, in full-banded techniques, a force on one tooth gives rise to generally undesirable reactive forces on other teeth in its vicinity.

The theory behind the buccal arch positioner (BAP) is dissipation of the force on any one tooth over every other tooth …

Commencement Program 1974, Loma Linda University

Commencement Programs

CONTENTS

2 | 1974 Events of Commencement

3 | The Academic Procession

4 | Conferring of Degrees

6 | Candidates for Degrees

24 | Awards

26 | Academic Costume

29 | Waymarks

Verrucous Carcinoma Of The Oral Cavity, Lane C. Thomsen

Loma Linda University Electronic Theses, Dissertations & Projects

This paper describes 39 cases of oral verrucous carcinoma. This study reports on 20 cases from the San Diego Tumor Group and 19 cases from the Oral Pathology Service which showed the characteristic features of verrucous carcinoma. Twenty three patients were men and 16 were women. In the majority of the cases the lesion was exophytic and had a papillary surface. The buccal mucosa and gingiva were the sites most frequently involved. The characteristic histologic pattern consisted of keratinized well-differentiated epithelium exhibiting irregular folds. In addition there was an inward projection of bulbous rete ridges. Surgical excision was the treatment …

Bone Regeneration Over Submerged Dental Roots In Dogs, Roger Lee Plata

Loma Linda University Electronic Theses, Dissertations & Projects

Nonendodontically treated roots were submerged 1.5 to 2.0 mm. below the alveolar crest in three dogs. Twelve roots were treated in this manner. Regeneration of alveolar bone can be seen in three weeks with complete bone coverage in five weeks. A complete lamina dura can be seen around the amputated roots.

Bone failed to regenerate over two of the twelve roots. In one case there was delayed healing due to the early loss of some sutures. A sinus tract developed connecting the oral environment with the contents of the pulp. This led to bone resorption and a necrotic pulp. In …

A Cephalometric Study Of Mandibulo-Facial Disostosis In Monozygotic Twins Using Computerized Methods, Lyn M. Lamberton

Loma Linda University Electronic Theses, Dissertations & Projects

An investigation using computerized cephalometrics has been conducted to consider the cephalometric factors responsible for the characteristic appearance evident in individuals afflicted with Mandibulo-Facial Dysostosis. A pair of Negro monozygotic affected twins were studied using the other 10 non-affected members of the family as a control to minimize the environmental and hereditary factors. The Rocky Mountain Data System was utilized to analyze the lateral and frontal cephalometric radiographs of each individual using Ricketts Analysis and the data were subjected to statistical tests to determine the factors contributory to the syndrome. Age and size were considered and adjustments were made to …

Heat Treatment Of Chrome Cobalt Alloy Orthodontic Wire, Galen M. Fillmore

Loma Linda University Electronic Theses, Dissertations & Projects

Chrome cobalt alloy orthodontic wire may be heat treated to increase spring performance and efficiency. This study was designed to quantify the effects that several heat treatment temperatures have upon the ability of .016" x .022" type 1 chrome cobalt wire to resist permanent deformation. In addition, the changes in resistance to permanent deformation due to heat treatment at 900° F were studied in .018" stainless steel wire and chrome cobalt wire of all four tempers.

When compared to untreated wire, .016" x .022" type 1 chrome cobalt wire exhibited a maximum increase of approximately 174 percent in resistance to …

Histological Comparison Of Human Pulpal Tissue Reactions After Vital Partial Pulpectomies Using N-2, Dycal And Zoe Paste, David P. Clark

Loma Linda University Electronic Theses, Dissertations & Projects

A histological comparison of forty-four human teeth in which vital partial pulpectomies were performed, and the pulp stumps covered with dycal, N-2 and ZOE was carried out. The time interval at which the teeth were extracted for study was ten, twelve and fourteen weeks. These teeth were on patients twelve through seventeen years of age and were to he extracted for orthodontic purposes. The teeth were caries free, vital and asymptomatic. The percent retaining vital tissue, time intervals and type of paste were as follows:

• 14 week, dycal 75%
• 14 week, N-2 100%
• 12 week, ZOE 30%
• 12 week, N-2 …

A Screening Psychological Evaluation Of Patients With Temporomandibular Joint Dysfunction Or, Let's Evaluate The Personality Along With The Radiographs, William A. Woods

Loma Linda University Electronic Theses, Dissertations & Projects

In this study a lateral transcranial oblique TMJ radiographic series and a psychometric test were used in the initial diagnosis of twenty four patients presenting with pain and dysfunction of the TMJ area. It was found that the two diagnostic tests could be done practically in the dental office. The results of the two tests combined with history, and clinical findings gave the doctor the ability to make a more discriminating diagnosis. The doctor then had increased insight into the patients' expected response to treatment. He could also predict problem patients on the basis of their personality type. This gave …

Cephalometric Norms For The Mexican Population Using The Ricketts, Steinar, And Tweed Analyses, Eduardo A. Velarde

Loma Linda University Electronic Theses, Dissertations & Projects

In order to investigate the characteristics of the facial complex of the Mexican and to compare them with the Caucasian, a sample of 40 subjects, 31 males and nine females, of Latin American origin from Chihuahua, Chihuahua, Mexico, with a mean age of 16.6 years, were selected for this study. The criteria for selection were visual and only individuals with clinical normal, Angle Class I occlusion were chosen.

Lateral head Roentgenograms were obtained and cephalometric evaluation of the Skeletal and Dental Pattern was carried out using the Ricketts, Steiner, and Tweed Analyses.

The mean values for the Mexican were compared …

The Lasting Antimicrobial Qualities Of Three Root Canal Sealing Materials : Grossman's Sealer, Rickert's Sealer, And N2 Permanent, Lee R. Ingersoll

Loma Linda University Electronic Theses, Dissertations & Projects

An in vitro study using polyethylene tubes filled with Grossman's sealer, Rickert's sealer, and N2 permanent was conducted over a six month period in an effort to determine their lasting antimicrobial properties against eight different microorganisms.

From the study it was observed that N2 permanent possesses a long-lasting antimicrobial effect, but this effect appears to diminish greatly with time. Further investigation is needed to determine whether or not the effect is actually permanent in nature. The N2 permanent was also shown to have broader antimicrobial effectiveness against the eight microorganisms tested. N2 permanent produced zones of inhibition against five of …

Histologic Comparison Of Apical Tissue Response To Endodontic Overfills With Gutta Percha And Grossman's Sealer Vs. Sargenti Method (N₂), Donald L. Brewer

Loma Linda University Electronic Theses, Dissertations & Projects

This study compared endodontic overfills of N₂ and gutta percha-Grossman's Sealer from a histopathological basis. The study employed four male rhesus monkeys and a sample of 31 teeth.

The most obvious difference between the samples filled with N₂ and the gutta percha-Grossman's Sealer samples was the recurring presence of ankylosis in the N₂-treated teeth. Results also included bone necrosis, inflammation and root and bone resorption.

The N₂ samples were considered to have evidenced greater violence of reaction apically.

A Computerized Roentgenographic Cephalometric Study Of Hydrocephalus, Charles R. Henry Jr.

Loma Linda University Electronic Theses, Dissertations & Projects

A preliminary roentgenographic cephalometric investigation of twelve hydrocephalics has been conducted to consider the effects of increased intracranial pressure and enlarged neural mass on the craniofacial complex.

The Ricketts computerized analysis, utilizing both posterior-anterior and lateral cephalograms, and the Steiner and Tweed analyses, utilizing the lateral cephalogram, were used to compare the hydrocephalic to the norm.

The anterior cranial base was found to be significantly increased in length possibly due to the effects of hydrocephalus. The effects of hydrocephalus on the facial measurements were questionable in view of the fact that the significant findings of: 1) excessive inclination and protrusion …

Commencement Program 1973, Loma Linda University

Commencement Programs

CONTENTS

3 | The Academic Procession

4 | Conferring of Degrees

6 | Presentation of Diplomas

7 | Candidates for Degrees

26 | Awards

29 | Academic Costume

31 | Waymarks

The Theoretical Distribution Of Forces In The Rigid Component Of The Buccal Arch Positioner, Dennis H. Teruya

Loma Linda University Electronic Theses, Dissertations & Projects

The distribution of an applied force to the rigid component of the Buccal Arch Positioner was determined with a theoretically formulated model. The rigid component was assumed to be a free body without the semi-rigid attachments and was evaluated at four points for the force distribution. The summation of the forces and the moments were equated to zero and were utilized to derive equations to solve for the unknown forces. The unknown forces at each point of the rigid component were solved for in terms of the given force applications.

A laterally directed force application at one of the posterior …

Development And Analyses Of A New Ideal Finishing Appliance, Robert M. Asatani

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this paper is to introduce a new theoretical finishing appliance which should reduce the problems encountered during finishing with the present appliances. Maxillary and mandibular Buccal Arch Positioner appliances were constructed on a model that could deliver custom-designed force magnitude and direction to each tooth.

The mean force and displacement of 1 mm. for each flexible component were quantitated individually while all other flexible components were in a passive bracket position to see if the force magnitude to each tooth was constructed properly. Various hypothetical situation were quantitated. Unilateral mesial vectors caused skewing and labial displacement of …