Analytical, Diagnostic and Therapeutic Techniques and Equipment Commons^™

An Animal Model For Development Of Pulpal Inflammation, John W. Masters

Loma Linda University Electronic Theses, Dissertations & Projects

Several animal models have been proposed to develop pulpal inflammation. Procedures recommended in these models have many variables and have not produced consistent results. The purpose of this study was to create pulpal inflammation using the Nd:YAG laser.

Forty-five cuspids of 12-18 month old beagle dogs were lased at 5, 7.5, and 10 watts (W) for 20 seconds with a 600 micron contact probe. Five cuspids were not lased but were used as controls. Following laser application, the teeth were extracted at intervals of 3, 7, and 30 days. They were then fixed in 10% formalin, decalcified, sectioned, and stained …

Update - July 1996, Loma Linda University Center For Christian Bioethics

Update

In this issue:

-- Stress and Distress in Pediatric Nurses: The Hidden Tragedy of Baby K
-- Ethics Grand Rounds: The Year in Review
-- CEJA Reverses Its Stance on Using Anencephalic Neonates as Live Organ Donors
-- AMA Council's Ethics Overwhelmed by Public Sentiment

Treatment Effects Of The Edgewise Bioprogressive Herbst Appliance, Bernard C. Chang

Loma Linda University Electronic Theses, Dissertations & Projects

The effect of the Edgewise Bioprogressive Herbst appliance, as described by Dr. Terry Dischinger, was investigated on 24 Class II, Division 1 malocclusions. Mean pretreatment age of this sample was 11.2 months. All patients were treated by Dischinger with a Bioprogressive Herbst appliance. Lateral cephalographs taken before, after Herbst appliance therapy, and after edgewise treatment were traced, then digitized into Quick Ceph™. Measurements were computed by the computer software. The following results were found: 1) Average treatment time was 9 months. 2) An overcorrected Class I relationship was achieved. 3) Class II malocclusion was corrected by 4.5 mm skeletal alteration …

The Accuracy Of Computer Video Imaging Prediction : Just Prior To Surgical Mandibular Advancement/Genioplasty Orthognathic Cases, Jason T. Chiakowsky

Loma Linda University Electronic Theses, Dissertations & Projects

The accuracy of the computer video imaging treatment prediction was investigated using Quick Ceph Image.™ Thirty one surgical mandibular advancement/genioplasty orthognathic cases were examined to determine if the soft tissue profile prediction was representative of the actual result. All patients were over the age of 18. Lateral cephalographs and slides were taken immediately pre-surgically, and six months post-surgically. The slides were duplicated into 4X6 photographs. The cephalographs were digitized and the photographs captured by video on the Quick Ceph Image software program. A line drawing and computer video image treatment prediction were generated using the actual surgical change that had …

Mutagenecity Of Formocresol, Glutaraldehyde, Ferric Sulfate And Aluminum Chloride : Materials Used In Therapeutic Pulpotomies, Adolfo Barrera

Loma Linda University Electronic Theses, Dissertations & Projects

Ferric sulfate (Astringedent) and aluminum chloride (Hemodent) have been proposed as possible medicaments for use in primary teeth for therapeutic pulpotomies.

There is little information in the literature about the biologic properties of these medicaments.

The purpose of this study was to evaluate the mutagenic response of the ferric sulfate and aluminum chloride and compare them with glutaraldehyde (1.5%, 1% and 0.5% concentration) and formocresol (2%, 0.75%, 0.01% and 0.005% concentration). TA98 and TA1535 strain were used in the Ames test to assess mutagenecity. Neither ferric sulfate nor aluminum chloride exhibited mutagenic potential, in comparison with glutaraldehyde and formocresol, which …

Mandibular Asymmetry In Unilateral Class Ii Malocclusion : A Cephalometric Study, Raed Z. Moussa

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this study is to evaluate skeletal and dental asymmetry in unilateral class II malocclusion. A study group of 25 unilateral subdivision patients was compared to 25 class I malocclusion patients serving as the control group. Submento-vertical and frontal radiographs were used for the evaluation. Symmetry was evaluated by comparing measurements between right and left sides for both groups and matching the middle points with the midsagittal axis. Statistical paired and simple t-test were used to evaluate the difference between the two sides for both groups. The measurements showed no significant skeletal and dental asymmetries except for three …

Update - October 1995, Loma Linda University Center For Christian Bioethics

Update

In this issue:

-- Managed Care: Challenges Facing Interdisciplinary Health Care Teams
-- Anencephalic Neonates as Live Organ Donors: AMA and CEJA
-- Can Evil Even End?

Alveolar Bone And Cementum Regeneration Following Periodontal Reconstructive Therapy : A Review Of Histologic Observations In Man And Experimental Animals, Karen E. Rodden

Loma Linda University Electronic Theses, Dissertations & Projects

Periodontal regeneration includes the formation of both alveolar bone and cementum. Studies reporting histologic evidence of healing following periodontal reconstructive therapy were reviewed to determine whether regeneration of these structures improves with increasing healing interval, and whether they regenerate independently or whether regeneration of one structure is dependent upon regeneration of the other. Additionally, the review addresses whether specific reconstructive modalities predictably yield increased amounts of regeneration. Differences in regenerative potential between humans, nonhuman primates, and canines were also examined. Results of over a decade of studies of periodontal reconstructive therapy were tabulated by family (human, nonhuman primate, and canine) …

Update - July 1995, Loma Linda University Center For Christian Bioethics

Update

In this issue:

-- Gender Discrimination in the Medical Community

[ Responses to the American Medical Association of the Use of Anencephalic Neonates as Organ Donors ]
-- Maintain the "Dead Donor Rule"
-- Stairway to Hell
-- Let Parents Choose
-- Revisiting the Issues

The Rotations Of Maxillary Molars, Mandibular Molars, And Maxillary First Premolars In Acceptable Occlusions, G. Kristian Hansen

Loma Linda University Electronic Theses, Dissertations & Projects

The rotation of the maxillary molars is considered important in the orthodontic treatment of malocclusions. In this study a computer analysis program was developed to examine the rotations of maxillary molars, mandibular molars, and maxillary first premolars in casts of permanent dentitions with acceptable occlusions. Ninety three sets of untreated "acceptable occlusion" models from the collection of the Foundation for Orthodontic Research (FOR) were scanned on a flat bed scanner at 600 dots per inch (dpi). The images were analyzed using custom software on a computer. Measurements were made by relating maxillary first permanent molars to the midline, the archform, …

The Effects Of Rapid Palatal Expansion Therapy On The Periodontal Tissues Of The Central Incisors, Richard Gutierrez

Loma Linda University Electronic Theses, Dissertations & Projects

The periodontal structures around the maxillary central incisors in thirty-nine post-orthodontically treated patients, twenty-five of these patients had experienced Rapid Palatal Expansion (RPE), were examined to determine the periodontal consequences associated with two ways of managing the resultant diastema. In fourteen patients the diastema closure was assisted by elastomeric chain and in eleven patients the diastema closure was not assisted. Fourteen non-RPE orthodontically treated patients served as controls. Height of attached gingiva, gingival sulcus depth, attachment level, and alveolar bone level were recorded. One examiner, using calibrated techniques, performed all the measurements. The RPE groups and the control group all …

A Pilot Study Comparing The Forces Applied : Using A Chin Cup And Three Types Of Protraction Headgear, Daniel Miles Beisiegel

Loma Linda University Electronic Theses, Dissertations & Projects

A pilot study comparing force distributions of a chin cup, the Great Lakes reverse pull headgear (RPHG), Ormco's adjustable dynamic RPHG, and Grummons RPHG was done. A skull from a 69 year old female which demonstrated a Class III malocclusion was used to perform the tests of force. Forces applied to and generated on the skull were measured using a water-filled balloon system. This method was tested and found to be reliable and accurate.

Repeated measurements of force were recorded for each of the areas of stress (forehead, cheeks, chin, and condyles, as well as the posterior and superior portions …

Effects Of Furosemide And Oleic Acid On Thyroxine Binding To Isolated Pairs Of Thyroxine Binding Serum Proteins, Deborah Hustead

Loma Linda University Electronic Theses, Dissertations & Projects

Dosage dependent binding inhibition and redistribution of thyroxine (T₄) between three pairs of thyroxine binding serum proteins, TBG-TTR, TBG-albumin and TTR-albumin, by furosemide (0.0 to 1.0 mol/L) and oleic acid (0.0 to 0.10 mol/L) were studied using equilibrium dialysis with purified binding proteins at concentrations 1/200 of levels in normal human sera, separated across the dialysis membrane and competing for T₄.

Furosemide (1.0 mol/L) reduced TBG bound T₄ in both the TBG-TTR system and TBG-albumin system (>90% decrease) and inhibited T₄ binding to TTR in the TTR-albumin system (68% decrease) and to albumin …

An In Vitro Quantitative Evaluation And Comparison Of A Custom And A Popular Stock Orthodontic Appliance, Richard Scott Anderw Schalo

Loma Linda University Electronic Theses, Dissertations & Projects

An in vitro performance evaluation and comparison of a patient individualized appliance (Elan, Ormco Corporation, Glendora, California) and a Roth prescription appliance ("A"- Company, San Diego, California) was made using the Ideal Tooth Relationship Index (ITRI).

The sample consisted of 19 duplicated sets of models for a total sample of 38. For each pair of models one set was bonded with an Elan appliance and a duplicated set was bonded with a Roth appliance. Bracket placement followed the manufacturers recommendations. The bracketed teeth from these models were sectioned out individually and the appliances allowed to fully express themselves on full …

Load Deformation Test Of Mini Twin Metal Brackets : A Comparative Study, Karl D. Peach

Loma Linda University Electronic Theses, Dissertations & Projects

The trend toward more esthetic brackets has led to smaller brackets being used by orthodontists. The purpose of this study was to determine the force required to deform these smaller brackets and calculate the stress in the metal by using a torsional wire bending force. Ten types of brackets were tested and the results analyzed to determine how bracket geometry, manufacturing method, or material selection affected the strength of brackets. Results showed a significant difference between manufacturing methods, material used, and bracket geometry. Brackets made of 17-4 PH SS and 303 SS withstood higher stress than 316 SS, and all …

An Assessment Of Three Different Forms Of Sterlization And Clinical Usage On Various Orthodontic Pin And Ligature Cutters : A Pilot Study, Warren L. Creed

Loma Linda University Electronic Theses, Dissertations & Projects

With an awareness of cross infection in dentistry and of AIDS (acquired immune deficiency syndrome), sterilization in the dental office has been brought to the public's attention by the news media. Much work has been done on which sterilization methods are acceptable but little has been written about the effects of sterilization procedures on the instruments themselves. In this study, 36 pin and ligature cutters were sterilized 250 cycles using three different methods of sterilization following the guidelines given by the Center for Disease Control (CDC). The cutters were examined for changes in lateral hinge movement, visual appearance and ordinal …

Reproducibility Of Periodontal Probing, Su-Fang Wang

Loma Linda University Electronic Theses, Dissertations & Projects

This study evaluated reproducibility of periodontal probing by conventional manual and automated force-controlled electronic probes. A total of 1206 sites (6 sites per tooth including maxillary and mandibular incisor/canine, premolar, and molar sites) in 15 patients with history of moderate or advanced chronic periodontal disease were examined. Probings included probing pocket depths (PD), as well as probing attachment levels (PAL) from a reference stent. Measurements were recorded to the nearest 0.5 mm with both methods. Patients were examined twice, 7 to 10 days apart. At each visit, all sites were probed first with the conventional probe and then with the …

Update - September 1993, Loma Linda University Center For Christian Bioethics

Update

In this issue:

-- Abortion in Context: Individual, Family, and Community
-- Abortion Guidelines, Seventh-day Adventist Church, October 12, 1992
-- Holding Values in Tension: The 1992 Abortion Guidelines
-- Adventist Abortion Guidelines: A Clinical Ethicist's Perspective

[ Behind the Scenes: Development of the Abortion Guidelines ]

Evaluation Of Trismus Associated With Mandibular Fractures As It Relates To The Need For Direct Laryngoscopy And Intubation : A Prospective Study, Stephen T. Goei

Loma Linda University Electronic Theses, Dissertations & Projects

Trismus associated with mandibular fractures is thought to increase the risks of general anesthesia. Nasotracheal intubation is necessary since the dental arches will be occluded at the end of the procedure. To establish an airway, an awake nasal intubation or fiberoptic endoscopy is required if direct laryngoscopy cannot be performed due to trismus. A prospective analysis of fifty-one patients with various types of mandibular fractures indicated that trismus was for the most part due to two factors, pain induced guarding and infection. In this series, direct laryngoscopy was easily performed after induction and paralyzation in cases without infection. Direct laryngoscopy …

Update - September 1992, Loma Linda University Center For Christian Bioethics

Update

In this issue:

-- Euthanasia in the Netherlands - Excepts from an interview with Rob Willem Treep

[ Kevorkian and Assisted Suicide ]
-- Thoughts Provoked by Dr. Kevorkian's Suicide Machine
-- Because Laws Against Euthanasia Send a Broader Signal, Experiments Must be Careful
-- Act of Murder or Active Compassion?

Update - May 1992, Loma Linda University Center For Christian Bioethics

Update

In this issue:

[ Faith, Medicine, and Religious Liberty - Part 2, Christian Science ]
-- Spiritual Healing for Children
-- Religious Liberty, Spiritual Healing, and the Health Care of Children
-- Spiritual Healing, Laws, and Constitutional Free Exercise of Religious Rights
-- Baby Theresa: Parental Choice Must Reign in the Case of Brain-Absent Newborns
-- Anencephalic Infants as Organ Donors: Do We Follow Rules or Emotions?

Update - February 1992, Loma Linda University Center For Christian Bioethics

Update

In this issue:

[ Faith, Medicine, and Religious Liberty - Part 1, Jehovah's Witnesses ]
-- Blood Transfusions: A Patient's Right to Refuse
-- Jehovah's Witnesses and Blood Transfusion
-- Blood Transfusions: A Patient's Right to Refuse
-- A Patient's Right to Refuse Blood Transfusions: The Legal Rights of Privacy, Autonomy, and Free Exercise of Religion

-- [ Second National Conference on Health Care for the Elderly Co-sponsored by the Center for Christian Bioethics and Multidisciplinary Geriatric Council - March 1 & 2 ]

Update - December 1991, Loma Linda University Center For Christian Bioethics

Update

In this issue:

-- The Physician as an Agent of God: An Idea Whose Time Has Come

-- [ Medical Futility: A Value-Dependent Concept ]

The Fracture Strength Of Ceramic Brackets : An Update And Comparison, Christian P. Manley

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this study was to compare the fracture strength of ceramic brackets which are currently on the market with ceramic brackets tested in a previous study at Loma Linda. Fracture strengths of standard edgewise ceramic brackets vs. pre-torqued ceramic brackets and bicuspid ceramic brackets vs. central incisor ceramic brackets were also compared.

A total of 160 Polycrystalline brackets, 8 categories in groups if 20, were tested for fracture strength. Each bracket was tested using the same testing model that was used in the previous study at Loma Linda. The brackets were tested by torquing a wire within the …

The Accuracy Of Sonographic Imaging (Dolphintm Digigraph) And Standard Lateral Cephalometric Radiographs : A Comparative Study, Michael D. Teichman

Loma Linda University Electronic Theses, Dissertations & Projects

Radiation due to x-ray exposure is a concern, and the development of the Dolphin™ DigiGraph represents an attempt to limit this exposure. The purpose of this paper was to compare measurements (using Ricketts analysis) obtained from conventional radiographic cephalometric tracings with those obtained by computerized digitizing with the DigiGraph. Forty-six patients from the Loma Linda University School of Dentistry graduate orthodontic clinic were digitized, and the results were compared to the x-ray tracings of these patients. The results showed that seven of the twenty-one variables examined exhibited a statistical similarity between the two methods (DigiGraph and x-ray tracing). An examination …

The Use Of Corrected Occlusal X-Ray For Determination Of Ald : A Comparative Study, Merlin D. Ekvall

Loma Linda University Electronic Theses, Dissertations & Projects

In this study arch length discrepancy or ALD was studied in 50 untreated patients. The measurements obtained from Hilgers' corrected occlusal x-ray using his Occlusal Paralleling Instrument or O.P.I, were compared with those derived by four conventional methods, - "Eye balling," digital caliper determination, conventional mandibular x-ray, and the Rocky Mountain Data Systems computer analysis (31 cases). When using the OPI, results give a higher negative ALD as it takes into consideration the space required to level a curve of Spee.

Measurements were made by the author and 3 faculty members using the above methods. Statistical analysis of the means …

Update - December 1990, Loma Linda University Center For Christian Bioethics

Update

In this issue:

-- The euthanasia debate in the Netherlands: Biolegal, bioethical and biotheological considerations

[ In Vito Fertilization and Divorce ]
-- What Can We Learn?
-- A Legal Perspective
-- Some Thoughts Regarding Frozen Embryos and Devorce

The Long Term Stability Of The Dental Arches Following Rapid Palatal Expansion, Robert C. Stockdale

Loma Linda University Electronic Theses, Dissertations & Projects

The rapid palatal expander is an appliance which has been used to laterally expand the maxillary dental arch, with subsequent mandibular dental arch expansion.

The purpose of this study was to evaluate and quantify long term post treatment changes in the length and width of both dental arches following rapid palatal expansion.

Plaster models from eleven patients treated with rapid palatal expansion were obtained seven or more years after treatment. The dental arches were intact anterior to the first molars and no retreatment had taken place.

Maxillary and mandibular canine, premolar and molar arch width, arch length, arch circumference, and …

Evaluation Of Headgear Safety : A Comparative Study, William J. Pritchard

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this study was to determine the relative safety of headgear safety straps. Samples from five different safety headgear straps simulated orthopedic and orthodontic use and data were collected from a series of pulls on an Instron machine. The straps were compared by the distance the face bow traveled before the safety mechanism released, the force built into the face bow at safety release and the force required to remove the inner bow out of the molar tube. The conclusions are as follows: (1) the distance a face bow can travel from the molar tube and still be …

A Modified Nance Unilateral Molar Distalizer, Tracy J. Reiner

Loma Linda University Electronic Theses, Dissertations & Projects

This clinical study evaluated a modified Nance appliance designed by the author to distalize molars unilaterally for Class II correction. This fixed appliance did not rely upon extraoral traction or intraoral elastics. Twelve unilateral Class II patients aged 13 to 17 were treated nonextraction with the appliance. Pretreatment and posttreatment photographs were taken of the palatal soft tissue and did not reveal any untoward changes as a result of the Nance acrylic button. All molars were corrected to an Angle's Class I relationship. Molar correction was evaluated visually and molar distalization was measured using an acrylic jig fitted to the …