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Mechanical Evaluation Of Mandibular Defects Restored With Rhbmp-2: A Finite Element Model, Jelson Yalung 2012 Loma Linda University

Mechanical Evaluation Of Mandibular Defects Restored With Rhbmp-2: A Finite Element Model, Jelson Yalung

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: The utilization of recombinant human Bone Morphogenetic Protein-2 (rh- BMP2) to form new bone has been shown to be a promising alternative to autogenous bone grafts. Understanding the biomechanical properties of rhBMP-2 restored mandibular defects would provide useful knowledge in the future success of orthopedic and dental treatment in patients who have had restoration of mandibular defects with rhBMP-2. The aim of the study was to evaluate and compare the biomechanical characteristics of rhBMP-2 regenerated bone in mandibular defects using 2 different concentrations of rhBMP-2 with a given carrier in non-human primates Material and Methods: Critical-sized defects (approximately 2 ...


Dental And Buccal Bone Stability After Rapid Maxillary Expansion And Fixed Orthodontic Treatment, Allison Milliner 2012 Loma Linda University

Dental And Buccal Bone Stability After Rapid Maxillary Expansion And Fixed Orthodontic Treatment, Allison Milliner

Loma Linda University Electronic Theses, Dissertations & Projects

The objective of this study was to quantitatively evaluate, via CBCT, the dental and osseous effects of patients who had completed comprehensive orthodontic treatment with rapid maxillary expansion (RME) in conjunction with Ricketts prescription brackets. Thirty consecutive patients (16 males, 14 females; mean age = 13.9  1.9 years) who required RME as part of their orthodontic treatment and had pre-RME (T1), post-RME (T2) and final orthodontic (T3) CBCT images were included in the study. Thirteen patients had 2-banded, while 17 had 4-banded appliances. Measurements of interdental distance (ID), interdental angle (IA), buccal bone thickness (BBT) and buccal marginal ...


Influence Of Outdoor Air Quality On Maxillofacial Growth And Development, Ryan Rudd 2012 Loma Linda University

Influence Of Outdoor Air Quality On Maxillofacial Growth And Development, Ryan Rudd

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: Mild to moderate deviations from normal facial types can significantly change orthodontic treatment modalities. Studies linking ambient air pollution with respiratory problems, as well as craniofacial morphology with respiratory problems are well established.1-19 In this study we aimed to determine if there was a correlation between ambient air pollution and maxillofacial growth and development. We also wanted to determine if further research should be done in this area, and if so how can the study be improved. Materials and Methods: We selected Santa Maria, CA and Upland, CA as sample areas due to their significant differences in air ...


Effect Of Dehydration On In-Office Bleaching Color Changes, Natalia Restrepo-Kennedy 2012 University of Iowa

Effect Of Dehydration On In-Office Bleaching Color Changes, Natalia Restrepo-Kennedy

Theses and Dissertations

Objective: The aim of this pilot study is the evaluation and measurement of color stability from baseline until stabilization of color associated with bleaching and the dehydration and rehydration process of the teeth.

Method: Six extracted intact human third molars were randomly selected, cleaned, and stored in artificial saliva at 370C. A custom positioning jig was fabricated for each tooth for reproducible color measurement. A baseline shade was recorded according to the Commission Internationale de l'Eclairage L*a*b* (CIE-L*a*b*) using a Minolta Chromameter CR-(200). Color measurement for all testing was taking at baseline, 15 min ...


Analysis Of Periapical Biopsies Submitted For Histopathological Evaluation: A Retrospective Study, Abdullah I. Alqaied 2012 University of Connecticut

Analysis Of Periapical Biopsies Submitted For Histopathological Evaluation: A Retrospective Study, Abdullah I. Alqaied

Master's Theses

Apical periodontitis is the most common pathological process in the periapical region. Disciplined clinical and radiographic evaluations and appropriate diagnostic tests can detect lesions related to apical periodontitis. Aside from this, lesions mimicking pulp-related pathology but unrelated to pulpal infection and necrosis are occasionally discovered in the periapical region. The objective of this study was two-fold: (1) to determine the prevalence of diverse periapically located pathological entities, and (2) to apply that information to evaluate the rationale for routine submission of surgically obtained tissue for histological examination and diagnosis. Methods: A 5-year retrospective analysis of pathology reports from the UCONN ...


Remarkable Resilience Of Teeth (How Are Teeth So Brittle Yet So Resilient), Paul J. Constantino 2012 Marshall University

Remarkable Resilience Of Teeth (How Are Teeth So Brittle Yet So Resilient), Paul J. Constantino

Biological Sciences Faculty Research

Tooth enamel is inherently weak, with fracture toughness comparable with glass, yet it is remarkably resilient, surviving millions of functional contacts over a lifetime. We propose a microstructural mechanism of damage resistance, based on observations from ex situ loading of human and sea otter molars (teeth with strikingly similar structural features). Section views of the enamel implicate tufts, hypomineralized crack-like defects at the enamel–dentin junction, as primary fracture sources. We report a stabilization in the evolution of these defects, by ‘‘stress shielding’’ from neighbors, by inhibition of ensuing crack extension from prism interweaving (decussation), and by self-healing. These factors ...


The Long-Term Effects Of Water Fluoridation On The Human Skeleton, Debbie Chachra, H. Limeback, T. Willett, Marc Grynpas 2012 Franklin W. Olin College of Engineering

The Long-Term Effects Of Water Fluoridation On The Human Skeleton, Debbie Chachra, H. Limeback, T. Willett, Marc Grynpas

Debbie Chachra

Municipal water fluoridation has notably reduced the incidence of dental caries and is widely considered a public health success. However, ingested fluoride is sequestered into bone, as well as teeth, and data on the long-term effect of exposure to these very low doses of fluoride remain inconclusive. Epidemiological studies suggest that effects of fluoride on bone are minimal. We hypothesized that the direct measurement of bone tissue from individuals residing in municipalities with and without fluoridated water would reveal a relationship between fluoride content and structural or mechanical properties of bone. However, consonant with the epidemiological data, only a weak ...


Effect Of Finishing And Polishing Direction On The Marginal Adaptation Of Resin-Based Composite Restorations In Vitro, Laurie St-Pierre 2011 University of Iowa

Effect Of Finishing And Polishing Direction On The Marginal Adaptation Of Resin-Based Composite Restorations In Vitro, Laurie St-Pierre

Theses and Dissertations

Objective: To assess the effect of finishing and polishing direction on the marginal adaptation of resin-based composite restorations.

Methods: Forty human molars were collected and sectioned along their mesio-distal axis. Buccal and lingual enamel surfaces were flattened and a triangular preparation (0.87mm deep and 3mm wide) representing two 30° bevels was achieved. Specimens (n=20/per group) were randomly assigned in groups and restored with two resin-based composite materials: a nanofilled (Filtek Supreme Ultra)(FSU) and a microhybrid (Point4)(PT4) and two finishing/polishing techniques: a series of Sof-Lex discs (SL) and a sequence of diamond bur/dark-orange SL ...


A Retrospective Review Of Clinical International Normalized Ratio Results And Their Implications, Thomas Radmer, Moawia Kassab, James Glore 2011 Marquette University

A Retrospective Review Of Clinical International Normalized Ratio Results And Their Implications, Thomas Radmer, Moawia Kassab, James Glore

Thomas W Radmer

Warfrin is a key element in therapy for atrial fibrillation, deep venous thrombosis (DVT), stroke (cerebrovascular accident and cardiac valve replacement . The authors searced 16,017 active clinical charts for active patients of record for the years 2009-2010. The authors found that 1.96 percent of total Marquette University Dental Clinic patients had a history of warfrin use. INR values for a significant number of dental patients are not within the therapeutic range for their medical conditions. The patients physcian was contacted for warfrin dose regulation prior to invasive dental procedures.


Human Platelet Lysate Permits Scale-Up Of Dental Pulp Stromal Cells For Clinical Applications, Govindasamy Vijayendran, Ronald Veronica Sainik, Abdullah Aimi Naim, Nathan Kavitha R. Ganesan, Aziz Zeti Adura Che Abdul, Abdullah Mariam, Zain Rosnah, Abu Kasim Noor Hayaty, Musa Sabri, Bhonde Ramesh R. 2011 University of Malaya

Human Platelet Lysate Permits Scale-Up Of Dental Pulp Stromal Cells For Clinical Applications, Govindasamy Vijayendran, Ronald Veronica Sainik, Abdullah Aimi Naim, Nathan Kavitha R. Ganesan, Aziz Zeti Adura Che Abdul, Abdullah Mariam, Zain Rosnah, Abu Kasim Noor Hayaty, Musa Sabri, Bhonde Ramesh R.

Sabri Musa

Background aims. Dental pulp stromal cells (DPSC) are considered to be a promising source of stem cells in the field of regenerative therapy. However, the usage of DPSC in transplantation requires large-scale expansion to cater for the need for clinical quantity without compromising current good manufacturing practice (cGMP). Existing protocols for cell culturing make use of fetal bovine serum (FBS) as a nutritional supplement. Unfortunately, FBS is an undesirable additive to cells because it carries the risk of transmitting viral and prion diseases. Therefore, the present study was undertaken to examine the efficacy of human platelet lysate (HPL) as a ...


Cone-Beam Computed Tomography And Orthodontics: Awareness Assessment, Warren D. Libby 2011 Loma Linda University

Cone-Beam Computed Tomography And Orthodontics: Awareness Assessment, Warren D. Libby

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: The purpose of this study was to evaluate a specific orthodontic community's knowledge and understanding of Cone-Beam Computed Tomography (CBCT) technology as well as awareness of the implications of CBCT use, including risk assessment, radiation dose estimation, diagnostic utility, and issues of informed consent. It is incumbent on the profession to understand how practitioners view this technology as it gains popularity and ease of use. Materials and Methods: A 21-question survey with 13 additional demographic questions was distributed to several different populations affiliated with Loma Linda University School of Dentistry: 1) undergraduate dental students, 2) students in specialty ...


Profile Attractiveness In Borderline Class Iii Surgical/Orthodontic Cases, Melina Adamian 2011 Loma Linda University

Profile Attractiveness In Borderline Class Iii Surgical/Orthodontic Cases, Melina Adamian

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: This study evaluated differences between laypersons and orthodontists in rating facial attractiveness in borderline class III surgical/orthodontic cases. The purpose was to determine whether orthognathic surgery or camouflage is a better alternative for observable esthetic improvement in borderline Class III surgical/orthodontic patients. This study will aid the orthodontist in recommending treatment options to enhance profile attractiveness of borderline Class III surgical/orthodontic patients. Materials and Methods: Thirty profile images of treated borderline class III surgical/orthodontic cases were selected. Fifteen of the profile images were of cases that had been treated by orthodontics alone, and fifteen images ...


Sleeping Tongue Posture And Its Relationship To Craniofacial Morphology, Brent J. Tingey 2011 Loma Linda University

Sleeping Tongue Posture And Its Relationship To Craniofacial Morphology, Brent J. Tingey

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: There exists good consensus in the literature supporting the notion that resting tongue posture is an important factor in dental arch development and maintenance as well as airway control. What has yet to be quantitatively measured is the duration of time that a subconscious, resting tongue posture is maintained and whether such posture differs among various craniofacial morphologies. Quantifiable measurements might allow for prediction of tongue-posture-related problems specific to certain facial types. Purpose: The objective of this study was to record sleeping tongue posture over time in 27 subjects and to compare findings with craniofacial morphology determined by cephalometric ...


Accuracy Of Unsegmented Cbct In Mesial-Distal Tooth Measurements, Todd Wesslen 2011 Loma Linda University

Accuracy Of Unsegmented Cbct In Mesial-Distal Tooth Measurements, Todd Wesslen

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: Cone-beam computed tomography (CBCT) scans may be used to measure mesial-distal (MD) tooth width for orthodontic diagnosis and treatment planning. Purpose: The objective of this study was to determine if MD tooth measurements from unsegemented CBCT scans in the axial, sagittal, and coronal planes or from a panoramic reconstruction correlate and agree with respective measurements made on study models. Material and Methods: Using stone models of 30 subjects, reference MD tooth measurements were made using digital calipers. From CBCT scans, five different methods of measuring MD width were used and compared to the reference: (1) points chosen from orthogonal ...


Comparison Of The University Of Iowa's Community-Based And University-Based Pediatric Dental Clinics, Deise Cruz Oliveira 2011 University of Iowa

Comparison Of The University Of Iowa's Community-Based And University-Based Pediatric Dental Clinics, Deise Cruz Oliveira

Theses and Dissertations

The Muscatine Pediatric Dentistry Clinic (MPDC) at the Muscatine Center for Social Action (MCSA) was established January 4th, 2005. It is a partnership between the MCSA and The University of Iowa's Department of Pediatric Dentistry. MPDC operates Tuesdays (care provided by senior dental students) and Thursdays (care provided by pediatric dentistry residents). Students and residents are supervised by a pediatric dentistry faculty member. MPDC's mission is to provide dental care to low income children residing in Muscatine and Louisa counties, in Iowa. Care includes diagnostic, preventive, restorative, and emergency services. MPDC targets a population that has been traditionally ...


The Effect Of Valproic Acid On Histone Acetylation In Fadu-Luc Head And Neck Squamous Cell Carcinoma Cells, Ali Pourian 2011 University of Iowa

The Effect Of Valproic Acid On Histone Acetylation In Fadu-Luc Head And Neck Squamous Cell Carcinoma Cells, Ali Pourian

Theses and Dissertations

No abstract provided.


Bitewing Radiographic Evaluation Of Interproximal Carious Lesions On Permanent First Molars In 6 And 12 Year-Olds In The Public Health System Of Chile, Rodrigo Alejandro Haristoy Dr. 2011 Health Center

Bitewing Radiographic Evaluation Of Interproximal Carious Lesions On Permanent First Molars In 6 And 12 Year-Olds In The Public Health System Of Chile, Rodrigo Alejandro Haristoy Dr.

Master's Theses

No abstract provided.


Consumers' Choice Of Dentist: How And Why People Choose Dental School Faculty As Their Oral Care Provider, MyungJoo Kim 2011 University of Iowa

Consumers' Choice Of Dentist: How And Why People Choose Dental School Faculty As Their Oral Care Provider, Myungjoo Kim

Theses and Dissertations

This study is aimed to better understand how and why people choose dental school faculty as their oral healthcare provider. Increasing financial constrains in the U.S. dental schools has led dental schools to find an alternative funding sources and revenues from dental school faculty practice can be one of them. To effectively promote faculty practice, it is necessary to understand how and why people choose dental school faculty as their oral care provider. In addition, it is important to differentiate characteristics of comprehensive care patients and limited care patients since dental school faculty practices have a higher proportion of ...


The Relationship Of Hydrogen Peroxide Exposure Protocol To Bleaching Efficacy, So Ran Kwon 2011 University of Iowa

The Relationship Of Hydrogen Peroxide Exposure Protocol To Bleaching Efficacy, So Ran Kwon

Theses and Dissertations

Objectives: To compare two in-office bleaching methods with respect to tooth color change and level of hydrogen peroxide penetration into the pulp cavity, and evaluate relationships between penetration level and color change. Methods: 80 extracted canines were sectioned above the CEJ and pulp tissue removed. Tooth thickness was measured from the outer labial surface to the outer boundary of the pulp cavity at the cross-sectioned root 3mm below the CEJ using a digital caliper. Baseline color was measured spectrophotometrically; acetate buffer was added into the cavity. Teeth were mounted and exposed to two different bleaching regimens (conventional versus sealed bleaching ...


Relative Translucency Of Ceramic Systems For Porcelain Veneers, Karine Tenorio Landim Barizon 2011 University of Iowa

Relative Translucency Of Ceramic Systems For Porcelain Veneers, Karine Tenorio Landim Barizon

Theses and Dissertations

Objective: To compare the translucency of six different porcelains indicated for veneers, with various shades and opacities.

Methods: 13mm diameter and 0.7mm thickness discs were fabricated for the following porcelains (A1 shade; n=5): Empress Esthetic (EE), e.maxPress (EP), InLine (IL) (Ivoclar Vivadent); VITA PM9 (VPM), Vitablocks MarkII (VMII) (Vita Zahnfabrik); Kavo Everest G-Blank (KEG) (KaVo Dental GmbH) and Lava Zirconia (LZ) (3M ESPE). IL and LZ respectively served as positive and negative controls. Groups with different shades (BL2, BL4, A1, B1), as well as high (HT) and low translucencies (LT), were fabricated for e.maxPress. The luminous ...


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