Dentistry Commons^™

The Effects Of The Quadhelix Appliance On The Dentition And Adjacent Buccal Bone, Shannon Hilgers

Loma Linda University Electronic Theses, Dissertations & Projects

Maxillary palatal expansion has long been used in orthodontics as a means of correcting constricted and collapsed dental arches. The quadhelix appliance, developed by Drs. Robert Ricketts and Ruel Bench, expands buccal segments and causes distobuccal rotation in upper first molars. The objective of this study was to assess the direct effects that the quadhelix appliance on the surrounding dentition and buccal bone in the maxillary premolar and molar areas in a finite, measurable manner. This assessment was made using the NewTom 3G. The pre-quadhelix and post-quadhelix NewTom 3G images of twenty patients treated in the Graduate Orthodontic Clinic at …

Immediate Implant Placement In Extraction Sites With Periapical Lesions: A Retrospective Study, Yuan-Lung Hung

Loma Linda University Electronic Theses, Dissertations & Projects

Immediate implant placement into fresh extraction sites has become a relatively routine clinical procedure with a favorable prognosis. However, immediate placement into extraction sockets with lesions has not been extensively documented in humans. Therefore, the purpose of this study was to retrospectively determine the survival rate of implants placed into extraction sockets with visible periapical lesions.

Patient charts of 544 immediately placed implants from Loma Linda University School of Dentistry, Center for Prosthodontics and Implant Dentistry were examined. Eighty-six of the 544 implants had been placed immediately into extraction sockets with periapical lesions and they were included in this study. …

Distraction Of Heterotopic Bone Formed With Bmp-2 In A Rat Model: The Technique, Stacie Dawn Fenderson

Loma Linda University Electronic Theses, Dissertations & Projects

Multiple studies have shown that ectopic bone forms when bone morphogenic proteins (for example BMP-2 and BMP-7) and a collagen matrix are surgically placed in a rat model either orthotopically or heterotopically. Bone begins to form by the 14 day, and is at it maximum calcified state by the 21st day. The purpose of this study is to observe and quantify the effect of distraction osteogenesis on the ectopic bone. First, a preliminary procedure was performed by surgically placing a titanium cage into the back of a rat just caudal to the thoracic vertebrae. The anterior corners were sutured to …

The Skeletal Effects To The Maxilla After Rapid Maxillary Expansion Using Cbct, Brett J. Garrett

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this study was to use cone beam computed tomography (CBCT) to quantitatively evaluate and compare skeletal expansion and alveolar tipping of the maxilla at the maxillary canine (Cl), first premolar (PI), second premolar (P2) and first molar (Ml) after rapid maxillary expansion (RME). Transverse effects to the maxillary suture, nasal width and maxillary sinus were also assessed. Included in the study were thirty consecutive patients (17 males and 13 females; mean age = 13.8 + 1.7 years) requiring RME using Hyrax appliances as part of their comprehensive orthodontic treatment. The pre-RME and post-RME measurements of palatal and …

The Effect Of Mtad On Eight Strains Of E. Faecalis In Contaminated Root Canals, Bradley M. Newberry

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this investigation was to determine the antimicrobial effect of Biopure MTAD (a mixture of a tetracycline isomer, an acid, and a detergent) as a final irrigant on eight strains of Enterococcus faecalis (E. faecalis) in contaminated root canals of extracted human teeth. In addition, the Minimum Inhibitory Concentration (MIC) and Minimum Lethal Concentration (MLC) of MTAD were also measured on the same strains of bacteria. Two-hundred and forty extracted human teeth were instrumented using 1.3% NaOCl followed by 17% EDTA to remove the smear layer. The teeth were randomly contaminated with one of eight strains of E. …

Detection Of Simulated Apical Root Resorption Using Three Cone Beam Ct Machines, Marcus Paulson

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this study was to determine orthodontists' ability to discriminate small differences of simulated apical root resorption (SARR) on extracted teeth, using the output from three cone beam computed tomography (CBCT) machines. Twenty-four unrestored maxillary anterior teeth exhibiting normal morphology, were collected. The teeth were scanned by three CBCT machines: 1) the NewTom 3G (AFP imaging, USA), 2) the iCAT (Imaging Sciences, USA) 3) and the MicroCAT II (Siemens Medical, USA). Using a sandblaster the apical portion of each tooth was reduced in 0.5 mm increments up to a total reduction of 1.5 mm. Each root modification was …

Comparison Of Laser And Phosphoric Acid Etching On Sealant Shear Bond Strength, Seth David Latimer

Loma Linda University Electronic Theses, Dissertations & Projects

PURPOSE: To compare the effect of traditional phosphoric acid etching with Er,Cr:YSGG laser enamel etching on the shear bond strength of sealant material.

METHODS: Extracted healthy third molars were mounted in acrylic exposing the flattest surface available. Three groups of twenty teeth were used to evaluate traditional acid etching with 37% phosphoric acid as a control group as well as two different laser settings. The sealant material was attached using specialized jigs and then subjected to shear bond strength testing utilizing the ultradent method (MTS machine). Statistical methods employed were the Kruskal-Wallis rank test and the Mann-Whitney U test.

RESULTS: …

A Microleakage Study Of Cements With Stainless Steel Crowns, Heidi Joy Apuy

Loma Linda University Electronic Theses, Dissertations & Projects

PURPOSE: To compare the ability of newer adhesive resin cements and traditional glass ionomer cements to prevent microleakage under stainless steel crowns on extracted permanent third molars.

METHODS: All teeth were hand prepared and stainless steel crowns were cemented according to manufacturers' instructions. The specimens were thermocycled for 500 cycles and immersed in 2% methylene blue dye solution for 8 hours. Each tooth was imbedded in resin and cut into I mm thick sections by a slow speed diamond saw. The amount of microleakage was measured in microns under a traveling microscope. The measurements of each section of a tooth …

Salivary Characteristics In 3 And 4 Year-Old Children With And Without Visible Caries, Gloria Yañez

Loma Linda University Electronic Theses, Dissertations & Projects

PURPOSE: To compare salivary characteristics in 3 and 4 year-old Head Start children with and without visible caries.

METHODS: This case-control study was performed on 84 healthy 3 and 4 year-old Head Start children. After consent and inclusion criteria were met, each child was screened and assigned to one of two test groups based on their caries status. Group 1 consisted of children with no visible evidence of caries, although non-visible caries may have been present. Group II consisted of children with visible evidence demonstrating three or more carious lesions. Each child's unstimulated and stimulated whole saliva samples were collected …

Commencement Program 2007, Loma Linda University

Commencement Programs

CONTENTS

2 | 2006 Events of Commencement

3 | The Academic Procession

4 | Significance of Academic Regalia

5 | The Good Samaritan

6 | The Speakers

13 | The University Honorees

21 | The School Honorees

33 | The Program

• School of Medicine, 34
• School of Pharmacy, 45
• School of Dentistry, 50
• School of Science and Technology and School of Religion, 60
• School of Nursing, 68
• School of Allied Health Professions - Physical Therapy, 75
• School of Allied Health Professions, 82
• School of Public Health, 91

Detoxification Of Lipopolysaccharide By Endodontic Sealers, Dominic Côté

Loma Linda University Electronic Theses, Dissertations & Projects

Bacterial lipopolysaccharide (LPS) has been implicated in the pathogenesis of pulpal and periapical diseases. Several studies have evaluated the ability of various medicaments and irrigants used during root canal therapy to chemically detoxify LPS. The purpose of this study was to evaluate the ability of some endodontic sealers to detoxify LPS. This investigation compared the quantities of TNF-α released by human monocytes exposed to LPS or LPS pre-treated with sealers. The sealers tested were: Pulp Canal Sealer EWT (PCS), AH Plus (AH), and Sealapex (SA). Ca(OH)₂ and water (H2O) were respectively used as the positive and negative control materials. …

Effect Of Polishing Brushes On Dental Composite Resins, Robert Shun-I Wang

Loma Linda University Electronic Theses, Dissertations & Projects

PURPOSE: The effectiveness of many commercially available composite finishing and polishing devices have been studied and compared. However, no studies have directly compared the effectiveness among the polishing brushes. This study set out to (1) investigate the surface roughness reduction and gloss value increase of two universal dental composites polished by three polishing brushes and two well-studied finishing and polishing systems, and (2) to evaluate resulting surface morphology using scanning electron microscopy (SEM).

METHODS: 10 specimens were fabricated for each of five polishing groups for both composite resins, one microhybrid (Herculite XRV) and one nanofilled composite (Filtek Supreme Plus). Each …

Reproducibility Of Two Non-Consecutive Scans Using A Newtom 3g; In Vitro Model, Hyoung Jin Park

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: The aim of this study was to evaluate the reproducibility of mineral density measurement expressed in Hounsfield Units (HU) using a phantom device with known mineral densities and the NewTom 3G Cone Beam Computerized Tomography (CBCT).

Materials and Methods: A phantom device made of 21 HA cylindrical disks with known densities was fabricated. The phantom was scanned in 6, 9, and 12 inch fields of view using a NewTom 3G CBCT. The scans were repeated at non-consecutive sessions. Volumetric data in each of the scans were formatted to DICOM images. HU values of the regions of interest were retrieved …