Dentistry Commons^™

Perceived Stress, Severity Of Xerostomia, And Periodontal Status In Undergraduate Dental Students, Engku Ahmad Muzhaffar, Zurairah Berahim, Norsila Abdul Wahab, Norkhafizah Saddki

Journal of Dentistry Indonesia

Dentistry is a highly stressful program; stress is associated with xerostomia and periodontal disease.

Objective: This study aims to investigate the association of perceived stress, severity of xerostomia, and periodontal status in dental students.

Methods: This was a two-phase cross-sectional study of 245 Universiti Sains Malaysia (USM) undergraduate dental students. Phase 1 involved administration of the Perceived Stress Scale (PSS-10) and Summated Xerostomia Inventory (SXI). In phase 2, the Community Periodontal Index (CPI) was performed on 150 students to determine their periodontal status.

Results: Mean PSS-10 and SXI scores were 19.6 (SD 5.47) and 7.9 (SD 2.04), respectively. …

Probing The Porphyromonas Gingivalis Nitrosative Stress Response Network, Alexandra Galina

Theses and Dissertations

Objective: To persist in the oral cavity, the perio-pathogen Porphyromonas gingivalis must have an efficient nitrosative stress response mechanism. To better understand how P. gingivalis responds to nitrite (NO₂^-) we must determine what genes are involved in the nitrosative stress response network.

Methods: Through genomic screening, a list of genes was generated that were hypothesized to be part of the nitrosative stress response network and believed to be involved in nitrate/nitrite metabolism or redox state of the cells. Protein coding regions were replaced with the ermF sequence by allelic exchange mutagenesis. 15 mutants were created …

Antibacterial And Antibiofilm Efficacy Of Pineapple Hump (Ananas Comosus) On Porphyromonas Gingivalis In Vitro, Abdul Gani Soulissa, Billy Lombardo, Armelia Sari Widyarman

Journal of Dentistry Indonesia

Background: Periodontal disease is one of the most prevalent oral health problems in Indonesia that affects supporting tissues of the teeth. Porphyromonas gingivalis plays an important role in the pathogenesis of periodontal disease. Alternative therapy with natural plant extracts, including pineapple (Ananas comosus) hump extract may inhibit the growth of bacteria that cause periodontal disease. Objective: To determine the effect of pineapple hump extract on bacterial growth and adhesion of Porphyromonas gingivalis biofilms. Method: The bacterial inhibition test was performed by the agar well diffusion method, and biofilm density measurements were made using the biofilm assay method. Results: Pineapple hump …

S. Gordonii-Produced Hydrogen Peroxide Modulates Mir-663a And Ccl20 Expression In Oral Epithelial Cells, Marshall Houston Maynard

Theses and Dissertations--Medical Sciences

The mechanisms through which a persistent recognition of commensal bacteria by oral epithelial cells (OECs) mitigates an uncontrolled inflammatory response of the oral mucosa remain unknown. CCL20 secretion by OECs in response to pathogenic bacteria is regulated by S. gordonii (Sg)-induced miR-663a; nevertheless, the mechanisms involved in these Sg-modulated responses remain to be elucidated. Since Sg is a hydrogen peroxide (H₂O₂) producer, and H₂O₂ has been shown to stimulate miRNA expression, we hypothesized that H₂O₂ could be involved in Sg-induced miR663a and CCL20 responses. Expression of miR663a …

Selenomonas Sputigena: Growth Conditions And Projected Virulence Factors Of An Emerging Oral Pathogen, Kayla A. Keller

Theses and Dissertations

Periodontal diseases are ubiquitous diseases. They can affect people through a chronic infection that happens over a lifetime, but also as an aggressive infection that afflicts the younger population. It not only results in tooth loss and a lower quality of life, but it can also lead to fatal secondary infections like cervical cancer, heart disease, and Alzheimer’s disease. This study looks at Selenomonas sputigena, an emerging oral pathogen, that has been hypothesized to contribute to periodontal disease. It has been linked to fatal septicemia and has been found in increased abundance within the oral biofilm during peak infection. …

Part I: Complete Dentures And Diabetes Correlation, Ibeth Erazo

Publications and Research

Diabetes is one of the most frequent pathologies that dentists encounter, due to its high prevalence worldwide. The aim of this study is to present the correlation between diabetes and complete denture wearers, intending to emphasize the importance of proper control and denture adaptation to oral environment for this type of patient. Within the sphere of the dental office, one of the main complications to consider in this type of patient is periodontal disease, which is their most frequent complication. Other important oral manifestations considered in the research are fungal infections, xerostomia, and burning mouth syndrome. It is common for …

The Role Of Kinases And Phosphatases In The Pathobiology Of Porphyromonas Gingivalis., Sarah Whitmore

Electronic Theses and Dissertations

Periodontal diseases result from the interplay between the dysregulation of the host inflammatory response and the actions of a dysbiotic bacterial community. These chronic inflammatory conditions affect persons on a worldwide scale. P. gingivalis is strongly implicated as a key periodontal pathogen in the more severe manifestations of periodontal diseases such as periodontitis. A core element of P. gingivalis pathogenicity is its dysregulation of innate immunity, including suppression of IL-8 production by gingival epithelial cells. The NF-κB family of related transcription factors plays a central role in regulating many important aspects of innate immune responses. NF-κB RelA/p65 homodimers regulate transcription …

Filifactor Alocis, A Newly Appreciated Oral Pathogen, Fails To Induce The Respiratory Burst Response Of Human Neutrophils., Jacob S. Edmisson

College of Arts & Sciences Senior Honors Theses

Almost 50% of adult Americans suffer from periodontitis which is a bacterially induced inflammation of the tissue that surround and support the tooth. The accumulation of neutrophils, a critical cell component of the innate immune system, in the gingival crevice contributes to tissue damage. Filifactor alocis is a newly appreciated pathogen present in oral biofilms at periodontal disease sites. Studying the interactions between neutrophils and F. alocis will provide valuable information for delineating the role of this bacterium in periodontal disease and enhance our understanding of bacterial strategies to evade leukocytes’ antimicrobial mechanisms. The hypothesis that F. alocis modulates human …

Novel Protective Salivary Peptides And The Chitosan Nanoparticles Delivery System, Flavia Zaidan Cardoso Salina

Electronic Thesis and Dissertation Repository

As a result of its protein composition, saliva performs many essential functions that contribute to oral homeostasis. However, salivary proteins suffer quick degradation in the oral cavity, which decreases the protective potential of that fluid (Chapter 2). Using scanning electron microscopy (SEM), we evaluated the effect of our novel salivary peptides DR9, DR9-DR9, DR9-RR14 and RR14 on the crystallization of calcium oxalate (CaOx). All peptides containing DR9 showed significant inhibitory effect on the crystallization of CaOx, whereas RR14 showed no effect (Chapter 3). Next, we tested the adsorption behavior of our chitosan nanoparticles (CHNP) delivery system to hydroxyapatite (HA) surface …

A Polymerase Chain Reaction Method For The Detection Of Selenomonas Noxia, Arthuro Mehretu

UNLV Theses, Dissertations, Professional Papers, and Capstones

In recent studies, periodontal health has been linked to being overweight and/or obese. Among common oral bacteria, Selenomonas noxia has been implicated in converting periodontal health to disease. Selenomonas spp. have also been found in gastric ulcers, and were misdiagnosed as Helicobacter -like organisms, but no further studies were conducted. The increasing clinical and epidemiological importance of S. noxia necessitates the development of a rapid detection method. In this study, a TaqMan 16S rRNA based real-time Polymerase Chain Reaction (PCR) method was developed, optimized and evaluated for the rapid and specific detection of S. noxia . The 16S PCR assay …