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Articles 181 - 195 of 195
Full-Text Articles in Dentistry
Friction Produced By Esthetic Brackets With Varying Ligation, Christine Knox Abenoja
Friction Produced By Esthetic Brackets With Varying Ligation, Christine Knox Abenoja
All ETDs from UAB
Controlling friction is an important aspect of orthodontics because it allows more predictable tooth movement with less anchorage loss. Friction at the bracket/archwire/ligation interface can reduce the force available for desired tooth movement. Initial stages of orthodontic treatment depend on the ability of the archwire to slide freely through the bracket, making friction an important aspect of all orthodontic brackets in the early phases of orthodontic treatment. The purpose of the present in vitro study was to measure the force to move esthetic brackets over an archwire using different ligation methods. A stainless steel model reproducing the maxillary right dentition …
Potential Iatrogenic Effects On Enamel Treated With A Light Cured Flouride Releasing Filled Resin, Henry G. Griggs Jr
Potential Iatrogenic Effects On Enamel Treated With A Light Cured Flouride Releasing Filled Resin, Henry G. Griggs Jr
All ETDs from UAB
White spot lesions have long been a problem in fixed appliance orthodontic treatment. Various methods of prevention have been used in the past, most requiring patient compliance. The use of non-compliant orthodontic sealants to form a barrier on the facial surface of the tooth has been attempted in the past with limited success due mainly to the inability of composite resins to fully polymerize. Pro Seal(Reliance Orthodontic Products, Inc, Itasca, IL) is new product which claims to fully polymerize and provide protection from white spot lesions during orthodontic treatment. In vitro studies support this claim. The side effects of acid …
Bone Formation Around Implants In Adult Transgenic Mice With Selective Runx2-Ii Deficiency, Jaime Rodrigo Rivera
Bone Formation Around Implants In Adult Transgenic Mice With Selective Runx2-Ii Deficiency, Jaime Rodrigo Rivera
All ETDs from UAB
Titanium-aluminum-vanadium (Ti-6Al-4V) tacks were placed in the tibiae of 10 female wild type (Runx2 flox/+ or Runx2 flox/flox) and heterozygous (Runx2+/-, ColII Cre) mice littermates to examine healing and bone response. Animals were divided into control and test groups of 5 each. A novel generation of Runx2 knock-out mice where the gene is only deleted in chondrocytes was used. Ten days after implant surgery, specimens were recovered and prepared for histological, histomorphometric, and micro-CT morphometric analysis. Histological examination revealed that wild type animals presented larger regions of bone formation and endochondral ossification when compared to heterozygous mice. Micro-CT morphometric analysis …
Success Rates Of Temporary Anchorage Devices Placed In An Orthodontic Clinic, Alex C. Schreiber
Success Rates Of Temporary Anchorage Devices Placed In An Orthodontic Clinic, Alex C. Schreiber
All ETDs from UAB
In recent years, the use of a variety of temporary placed implants to attain absolute anchorage has been described in the orthodontic literature. The use of temporary implants, fixed to bone, overcomes some of the limitations of traditional anchorage and their reliance on patient compliance. The purpose of this study was to evaluate factors relating to the successful placement of miniscrew temporary anchorage devices in an orthodontic clinic. The orthodontic records of patients who had miniscrews placed during their treatment at the University of Alabama at Birmingham School of Dentistry Postgraduate Orthodontic Clinic were selected. After application of the inclusion …
Ca 2+ /Calmodulin-Dependent Protein Kinase Ii Regulates The Growth Of Human Osteosarcoma Cells In Vivo, Hyeran Choo
Ca 2+ /Calmodulin-Dependent Protein Kinase Ii Regulates The Growth Of Human Osteosarcoma Cells In Vivo, Hyeran Choo
All ETDs from UAB
Osteosarcoma is the most predominant primary bone cancer among pediatric patients. The pathogenesis and mechanism of osteosarcoma, however, as yet remains unclear. This study investigated the hypothesis that Ca2+/calmodulin-dependent protein kinase II (CaMK II), activated by Ca2+ and its intracellular receptor, calmodulin, plays a critical role in the growth of human osteosarcoma cells. The inhibition of CaMK II with its pharmacologic antagonist KN-93 was used to investigate the role of CaMK II in the growth of human osteosarcoma cells because our preliminary data showed that =-CaMK II is expressed in several human osteosarcoma cell lines. To examine the in vivo …
The Effect Of Cementation Technique On The Retention Of Adhesively Cemented Prefabricated Posts, Carlos A Polo Montes
The Effect Of Cementation Technique On The Retention Of Adhesively Cemented Prefabricated Posts, Carlos A Polo Montes
All ETDs from UAB
Adhesively cemented prefabricated posts are frequently employed for the restora-tion of endodontically treated teeth. Bonding agents may improve the post and core per-formance. Correct dentin bonding procedures are a critical factor in the bonded post re-tention, but adequate bonding in the canal space has been reported difficult to achieve. The operator is unable to visualize the depth of conditioner gel penetration into the canal, and its removal cannot be easily confirmed. Additional potential problems include excess water removal after rinsing the canal, inadequate primer coverage and/or removal, and poor curing methods for the resin luting agent. A technique to avoid …
Outcome Assessment On Skeletal Stability After Rigid External Distraction Osteogenesis In Cleft Lip And Palate Patients, Julio Enrique Tabarini
Outcome Assessment On Skeletal Stability After Rigid External Distraction Osteogenesis In Cleft Lip And Palate Patients, Julio Enrique Tabarini
All ETDs from UAB
Purpose: Distraction osteogenesis (DO) using an external distraction device in the correction of maxillary hypoplasia (MH) in cleft lip and palate patients has been shown to be an effective and stable technique. The purpose of this study is to determine the outcome of skeletal stability for this procedure using the Rigid External Distraction (RED) System in patients with cleft lip and palate (CLP). Materials and methods: Twenty CLP patients with moderate to severe maxillary hypoplasia were treated between June 2000 and June 2006. Their average age at the time of the surgery was 12.6 years. DO was started after a …
In Vitro Compressive Fracture Resistance Of The Human Maxillary First Premolar With Different Mod Cavity Design And Restorative Materials, Wen-Chou Wu
All ETDs from UAB
Cuspal failures of MOD (mesial-occlusal-distal) restored teeth have been constantly observed in clinic especially those restored with amalgam. As the pulpal depth and isthmus width of the preparation increases, the strength decreases. A number of studies have investigated the adhesive technique which is intended to increase the fracture resistance by bonding the tooth structure. The results of the studies are controversial because of the differences of research design among studies. The purpose of this study is to evaluate the fracture resistance of the human maxillary first premolar restored with condensable composite (Surefil, Dentsply) and CEREC 3D ProCAD leucite-reinforced ceramic inlays …
Barrier Membranes For Ridge Augmentation - Is There An Optimal Pore Size?, Rajesh Gutta
Barrier Membranes For Ridge Augmentation - Is There An Optimal Pore Size?, Rajesh Gutta
All ETDs from UAB
Background: - Alveolar bone loss is often a sequelae of edentulism. However, several reconstruction procedures with bone grafts and barrier membranes are used to restore the lost bony architecture. The value of titanium mesh barriers has been shown to be reliable both in vertical and horizontal ridge augmentation procedures. However, there is a paucity of literature supporting the role of pore size of barrier membranes in preventing soft tissue ingrowth during ridge augmentation procedures. There are multiple reports describing a layer of soft tissue with varying thickness beneath the mesh and adhering to the newly regenerated bone. The objective of …
A Case Series Study Of Vitapex Pulpectomy Treatment In Primary Teeth Ii, Hsin-Ju Hsieh
A Case Series Study Of Vitapex Pulpectomy Treatment In Primary Teeth Ii, Hsin-Ju Hsieh
All ETDs from UAB
Purpose. The aim of this case series study was to conduct a long-term follow-up and review of subjects with previous Vitapex® pulpectomies, to evaluate outcomes clinically and radiographically, and to ascertain whether there was any interference with exfoliation of deciduous teeth or abnormal development of succedaneous teeth. Methods. This case series study was conducted by following target groups of pediatric patients who had received Vitapex® pulpectomies in their primary teeth. Data were collected by reviewing charts, identifying patients who met our criteria, and recalling them for follow-up appointments. After sufficient data were accumulated, survival analysis was applied and presented by …
Surface Reproducibility Of Impression Materials, Amit Shah
Surface Reproducibility Of Impression Materials, Amit Shah
All ETDs from UAB
The inability to absorb or release moisture limits the ANSI/ADA specification 19 stainless steel mold from accurately mimicking tooth structure and oral conditions while evaluating in vitro detail reproduction of elastomeric impression materials. Moreover, studies utilizing this mold have been graduated at room temperature, not normal mouth temperature. Bovine teeth, being similar to human teeth in microstructure and composition, are the closest substitutes that can be used to evaluate surface detail reproducibility of impression materials. The objectives of this study were (1) to develop a new bovine in vitro test model at controlled temperature and humidity in order to simulate …
Vitamin D Receptor Deficiency And Postnatal Tooth Formation, Xueming Zhang
Vitamin D Receptor Deficiency And Postnatal Tooth Formation, Xueming Zhang
All ETDs from UAB
The reduction of caries is one of the major objectives of Healthy People 2010 (USDHHS, 2000). For individuals at risk for caries, early identification and interception before the occurrence of the disease are crucial to preventing the cariogenesis. However, host genetic variants that compromise the mineralization of dental enamel and dentin are unclear. The vdr mutation has been reported to be associated with bone loss. Therefore, it is likely that vitamin D resistance may affect dental enamel and dentin formation. The objective of this study was to investigate the effects of VDR deficiency on postnatal tooth formation in a vdr …
The Impact Of A Community Health Advisor-Based Intervention On Self-Reported Frequency Of Dental Visits In A Rural, Low-Income African American Alabama Community, Stephen J. Clarke
The Impact Of A Community Health Advisor-Based Intervention On Self-Reported Frequency Of Dental Visits In A Rural, Low-Income African American Alabama Community, Stephen J. Clarke
All ETDs from UAB
Oral health disparities are wide and increasing for rural Southern African- Americans. This project trained 13 experienced Community Health Advisors (CHAs) from Uniontown, Alabama, in the basics of oral health, including regular dental visits, and assigned them to spread this information among their fellow community members. We tested whether a 1-year CHA-based oral health education intervention was associated with increased routine/preventive use of available dental services as measured by pre-post self-report, relative to a comparison community. We also hypothesized that any detected association between the intervention and use of dental services was mediated by attitudes toward dental visits. No direct …
Isolation And Characterization Of Human Periodontal Ligament Stem Cells, Isabel C. Gay
Isolation And Characterization Of Human Periodontal Ligament Stem Cells, Isabel C. Gay
All ETDs from UAB
The periodontal ligament (PDL) is thought to include progenitor cells capable of forming fibroblasts, osteoblasts and cementoblasts. However, characterization of PDL stem cell populations (SC) remains undetermined due in part, to the diversity of cell types that conform to the periodontal apparatus. Objective: To isolate and characterize PDLSC and assess their pluripotent capabilities to differentiate into bone, cartilage and adipose cell types. Methods: PDL was scraped from human teeth, enzymatically digested, and cells stained for STRO- 1 (SC marker) using fluorescent immunohistochemistry. Positive cells were FACS sorted and expanded in culture. Human bone marrow SC (BMSC) served as a positive …
Micro-Computed Tomographic Analysis Of Bone Healing Subsequent To Graft Placement, Preeti M. Chopra
Micro-Computed Tomographic Analysis Of Bone Healing Subsequent To Graft Placement, Preeti M. Chopra
All ETDs from UAB
A MicroCT analysis of bone healing subsequent to graft (tri calcium phosphate/TCP) placement in the maxillary sinus prior to dental endosteal implant placement was the objective of the current study. Ten trephined rod shaped human bone cores were obtained three months after the placement of particulate graft material and the samples were stored immediately in 10% neutral buffered formalin. Using a Microcomputed tomography, the samples were evaluated at resolutions of 6 and 20μm. The thresholds for bone and graft material were determined using visual image, intensity (grey level) and histogram analyses. The graft and bone threshold was 235 greylevel and …