Medicine and Health Sciences Commons^™

An In Vitro Study Comparing The Conventional Step-Back Instrumentation Technique To A Combination Step-Back/Ultrasonic Technique, James A. Eberhardt

Loma Linda University Electronic Theses, Dissertations & Projects

Cleaning and shaping the root canal system is an important phase of endodontic therapy, and must be performed thoroughly and completely if successful root canal therapy is to be expected. A number of investigators have compared different methods of cleaning and shaping of the root canal system. The purpose of this study was to compare the effectiveness of the conventional step-back technique with that of a combination step-back/ultrasonic technique. This combination technique is a modification of the conventional step-back technique using an ultrasonic instrument alternately with hand instrumentation. Utilizing 40 canals from extracted human mandibular molar teeth with a curvature …

Dentalgram - Vol. 06, No. 12, Loma Linda University School Of Dentistry

Dentalgram

In this issue:

• "The Race"
• Growing Ioan fund
• Junior/senior conference
• Student conduct
• IDP camping trip
• Students at La Vida
• Adopt-a-child
• Dental Sabbath school outing and schedule
• New library service
• SD applications
• Dean's Circle dinner
• New class at La Sierra
• Christmas breakfast
• Loss in the family

Dentalgram - Vol. 06, No. 11, Loma Linda University School Of Dentistry

Dentalgram

In this issue:

• Executive Committee information
• Student presentation
• Dental Family Fellowship
• Student research
• Faculty doings
• Courtyard dedication
• Computer comfort
• Christmas breakfast
• Parking lot sale

Dentalgram - Vol. 06, No. 10, Loma Linda University School Of Dentistry

Dentalgram

In this issue:

• Great classes pass rate
• Funding increase
• Research laboratory open
• ReTREAT a success
• DH gets challenge
• From the dean
• Students in service
• Juniors, seniors to have retreat
• IDP visits Yosemite
• Slogan contest winner
• Students attend conference
• SS class has outing
• Rideshare benefit
• Recruiting activity
• Hawaii adventure
• Employee Association activities

Dentalgram - Vol. 06, No. 09, Loma Linda University School Of Dentistry

Dentalgram

In this issue:

• Annual Fund goal exceeded
• New residents in endodontics
• Student reflections on Sabbath retreat
• Student volunteers recognized by ADA
• New journals at library
• Upcoming graphic slide seminar
• New dental Sabbath school schedule
• Blood drive update

Transforming Growth Factor-Beta 1 Expression In Developing Ovine Teeth As Visualized By In Situ Hybridization, Søren Jepsen

Loma Linda University Electronic Theses, Dissertations & Projects

Recently we demonstrated that human dentin contained relatively high amounts of transforming growth factor beta (TGF-ß) and proposed that dentin TGF-ß originated from odontoblasts. Because of the suggested role of TGF-ß in mediating cellular interactions in dental cell development by paracrine mechanisms, we studied the expression of TGF-ß message in developing teeth by in situ hybridization. 5 µm serial sections of neonatal sheep mandibular third molars that had been fixed in glutaraldehyde and paraffin-embedded were used for in situ analysis. An [³⁵S]-labeled cRNA probe, complementary to TGF-ß1 mRNA, was constructed from human TGF-ß1 cDNA. Northern analysis of total …

Development Of Periapical Lesions In Immunosuppressed Rats, Phillip A. Waterman Jr.

Loma Linda University Electronic Theses, Dissertations & Projects

The pathogenesis of periapical lesions is the interaction of the oral flora with the existing host defenses. The role of bacteria has been established in endodontic disease but the contribution of the host defenses in periapical lesion formation is less clear. The purpose of this study was to compare periapical lesion development in immunosuppressed rats with that in normal rats. Thirty-five, eight-week old Sprague-Dawley rats were equally divided into seven groups. Groups 1, 2, and 3 were given weekly injections of Cytoxan, an immunosuppressive agent. Groups 4, 5, and 6 received no immunosuppressive therapy. Group 7 served as a control, …

Antibacterial Effects Of Various Endodontic Irrigants And Medicaments On Selected Anaerobic Bacteria, Patrick K. Ohara

Loma Linda University Electronic Theses, Dissertations & Projects

This study was undertaken to determine the antibacterial effects of various endodontic irrigants and medicaments against six selected anaerobic bacteria. In part 1, the organisms were mixed separately with dilutions of six irrigants in tubes containing fluid thioglycolate broth and allowed to remain in contact for specific time periods before being evaluated for growth. In part 2, the vapors of six medicaments were tested using agar plates streaked with the bacteria.

For part 1, the six irrigants were ranked as to their ability to inhibit bacterial growth. Statistical analysis showed that chlorhexidine and hydrogen peroxide were significantly more effective as …

Retrofilling Materials : The Effects Of Two Setting Times On The Degree Of Dye Leakage Of Retrograde Filling Materials, Robert K. Higa

Loma Linda University Electronic Theses, Dissertations & Projects

Sealing of the root canal system is usually accomplished by the conservative endodontic approach. Cases where it is impossible to treat nonsurgically are usually treated surgically by an apicoectomy and retrofill. There is a lot of controversy in the literature over which retrofilling material is closest to ideal. Presently, the most popular materials seem to be Amalgam, Super EBA, and IRM. For this reason, these materials were chosen for this study to evaluate the leakage potential at two different time intervals to see if setting time of the material had any influence on the amount of leakage.

Seventy extracted single …

A Pilot Study On The Evaluation Of Short Term Effects Of Jasper Jumper Therapy, Eric D. Fraser

Loma Linda University Electronic Theses, Dissertations & Projects

Lateral cephalometric radiographs were obtained for ten patients treated with Jasper Jumper appliances from three locations. Pre and post-appliance measurements were compared to determine the cephalometric effects seen in this group of patients. All patients in this study exhibited mesofacial to brachyfacial growth patterns and were all of growing age. All patients were treated to Class I along the complete buccal segment. The results yielded the following conclusions: 1) the facial axis did not open and the lower face height did not increase significantly for this group of patients, 2) there is an intrusive effect delivered to the upper first …

A Shear Bondstrength Evaluation Of Five Orthodontic Light-Cured Adhesives, Perry M. Unruh

Loma Linda University Electronic Theses, Dissertations & Projects

In this study, the shear bondstrengths of five commercially available orthodontic light-cured adhesives were evaluated with respect to two types of curing lights and various cure-times. A total of 160 Transcend brackets (mechanical retention) were utilized. The brackets were individually bonded to knurled stainless steel testing rings via the respective adhesives. Each bracket was sheared from the testing ring using an Instron machine. For each adhesive a 2, 5, 10, and 20 second cure-time, and an immediate, 5 minute, 20 minute, and 24 hour shear test time was employed. The adhesives were cured using high intensity and low intensity visible …

Dentalgram - Vol. 06, No. 08, Loma Linda University School Of Dentistry

Dentalgram

In this issue:

• School of Dentistry retreat is upon us
• DH surpasses fund-raising goal
• Join new dentistry Sabbath school
• Japanese educators visit Loma Linda
• Researchers return from Scotland
• Lock your clinic carts
• Handpieces to be sterilized between each patient
• Dental employee wins travel certificate
• Give blood at School blood drive

Dentalgram - Vol. 06, No. 07, Loma Linda University School Of Dentistry

Dentalgram

In this issue:

• CDA student rep speaks at conference
• Student table clinic presented in Scotland
• New graduate student accepted
• Department busy over the summer
• Update on handpiece sterilization
• ADA director retires
• Peace Corps recruits
• New location for Dentalgram drop-off
• Seminar to be held at Veterans Hospital

Ability Of Cylindrical Root Form Implants To Withstand Controlled Lateral Forces, Silvio Emanuelli

Loma Linda University Electronic Theses, Dissertations & Projects

The ability of root form implants to withstand lateral forces has been investigated in animal model. Two new techniques for quantification of forces generated by a loading device have been developed and tested. The strain gages bonded to the loading device were calibrated either intraorally by a micro load cell, or in laboratory by Instrom Machine.

Preliminary results indicate that laterally applied continuous forces up to 6,000 grams do not elicit failure of root form implants.

New In Vivo And In Vitro Techniques For Quantification Of Lateral Force Levels That Cause Implants To Fail : A Progress Report On Monkey Research, V. Leroy Leggitt

Loma Linda University Electronic Theses, Dissertations & Projects

Two new techniques for quantification of forces generated by an expansion screw apparatus placed between pairs of cylindrical endosseous titanium implants are described, along with preliminary data gained from their use in Macaca rhesus monkeys. Strain gages were bonded to the expansion apparatus and were calibrated either directly by micro load cell, or indirectly by Instron Machine to reflect the applied force.

Immediate loads of up to 6 kilograms have been applied to the implants with no increase in mobility as verified by a Periotest device. No previous studies on the orthodontic uses of implants have evaluated in vivo forces …

Soft Tissue Changes Of The Upper Lip Following Isolated Le Fort I Osteotomies, Kendall E. James

Loma Linda University Electronic Theses, Dissertations & Projects

Pre-operative (T-1) and post-operative (T-3) radiographs were obtained and traced for fifty-one non-growing patients who had undergone isolated Le Fort I osteotomies. These tracings were then digitized with the results arranged in a data file and subjected to statistical analysis. The purpose of this study was to establish ratios for certain hard to soft tissue movements that could be used to aid the clinician in post-surgical soft tissue profile prediction. The results showed that even though a large sample was used, individual patient variability remained high particularly in the horizontal directions. Most ratios found in this study were consistent with …

Condylar Angulations As Related To Submental-Vertex Radiographs, Jady L. Chiakowsky

Loma Linda University Electronic Theses, Dissertations & Projects

Pretreatment submental-vertex radiographs were obtained for 637 adolescent patients (307 males, 330 females) who had presented themselves for orthodontic treatment. The purpose of this study was to: (1) determine the relationship between condylar angulations and depth of cut with the variables: age, sex, and race, and (2) establish normative values for the categories studied. The results indicated that no significant differences existed between the condylar angulations for the variables measured. However, significant differences did exist between the depth of cut for the variables measured and there was significant interaction between age and race with respect to the depth of cut. …

An Evaluation Of Surface Enamel Damage Following The Debonding Of Ceramic Brackets : A Follow-Up Study, B. Scott Hood

Loma Linda University Electronic Theses, Dissertations & Projects

To evaluate surface enamel damage after debonding ceramic brackets using their manufacturer's recommended methods, sixty four bicuspid teeth were bonded with three different types of ceramic brackets and one type of metal bracket. All the brackets tested utilized mechanical retention only. The brackets were debonded in the mouth seven to ten days after bonding, extracted and evaluated with a scanning electron microscope. The study concluded that: 1) all brackets alter the surface enamel, 2) there is a significant difference in surface enamel damage between the metal bracket and the ceramic brackets utilizing a tensile debonding method, 3) there is no …

Predicting Post-Treatment Maxillary Lip Position : A Comparison Of Two Techniques, Kevin J. Andrews

Loma Linda University Electronic Theses, Dissertations & Projects

The objective of this study was to compare the "drape" technique as proposed by Economides with the Holdaway technique in predicting post-treatment maxillary lip position and to determine which method was more accurate. Pre and post-treatment lateral cephalograms were traced for ninety (Caucasian) cases equally divided by sex into three treatment groups: a) non-extraction with at least 4mm of upper incisor retraction, b) extraction of upper first bicuspids only, and c) extraction of all first bicuspids. VTO's were constructed as outlined by Economides (drape) and Holdaway for prediction of post-treatment maxillary lip position. The predicted lip positions were compared to …

Commencement Program 1992, Loma Linda University

Commencement Programs

CONTENTS

2 | 1992 Events of Commencement

3 | Academic Procession

4 | The Speakers

8 | The Honorees

16 | The Zapara Awards

Order of Programs

• School of Medicine, 18
• School of Dentistry, 25
• Graduate School, 32
• School of Nursing, 40
• School of Public Health, 44
• School of Allied Health Professions, 51

Dentalgram - Vol. 06, No. 06, Loma Linda University School Of Dentistry

Dentalgram

In this issue:

• Commencement report
• Senior candids
• School of Dentistry has new Sabbath school
• ReTREAT plans unfold
• New signs for Prince Hall
• Students to spend summer in mission outreach
• Students conduct committee reports
• Department faculty busy
• Library has new serials, book
• LSU holding business seminar
• Alumni request help

Dentalgram - Vol. 06, No. 05, Loma Linda University School Of Dentistry

Dentalgram

In this issue:

• School has physical therapy clinic
• Students accepted for coming school year
• Jobs available for students
• Professional appearance to be maintained on clinic floor
• Students covered by insurance for Boards
• Last call for mission
• A reTREAT has been planned for you
• Faculty present, publish papers
• Benefits Fair to be held
• Pageant of the Masters tickets available
• Three inducted into Sigma Xi

Dentalgram - Vol. 06, No. 04, Loma Linda University School Of Dentistry

Dentalgram

In this issue:

• School departments make top 10 list of national magazine
• Faculty, students attend meeting in Boston
• Research clinics accepted for Glasgow, Scotland
• Faculty travel far and wide
• School of Dentistry Retreat is coming
• Tips on committee chairing given
• Conference on older adults to be held

The Periodontal Intraosseous Defect Following Root Conditioning With Citric Acid And Wound Closure Including A Ptfe Membrane : An Experimental Study, Betty Glaser Kersten

Loma Linda University Electronic Theses, Dissertations & Projects

Treatment of the intrabony or intraosseous periodontal defect has rendered much attention over the last few decades. Numerous approaches have been advocated; however, overall comparisons between treatments do not exist. This review summarizes and discusses outcomes of therapeutic modalities in the intrabony periodontal lesion from controlled clinical studies. The modalities reviewed include scaling and root planning, gingival flap surgery, gingival flap surgery including wound closure with interdental denudation, root-biomodification, placement of autologous, allogenic, or xenogeneic bone grafts, placement of alloplastic grafts, and placement of tissue guiding barrier membranes. In addition histologic observations of healing in the intrabony periodontal lesion are …