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Role of dental plaque,saliva and periodontal disease in Helicobacter pylori infection

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World Journal of Gastroenterology 2014年第19期20卷 5639-5653页

作者： Pradeep S Anand Kavitha P Kamath Sukumaran Anil Department of Periodontics People’s College of Dental Sciences and Research CentreBhopalMadhya Pradesh 462037India Department of Oral Pathology People’s Dental AcademyBhopalMadhya Pradesh 462037India Department of Periodontics and Community Dentistry College of DentistryKing Saud UniversityRiyadh 11545Saudi Arabia

Helicobacter pylori (H. pylori) infection is one of the most common bacterial infections in humans. Although H. pylori may be detected in the stomach of approximately half of the world’s population, the mechanisms of transmission of the microorganism from individual to individual are not yet clear. Transmission of H. pylori could occur through iatrogenic, fecal-oral, and oral-oral routes, and through food and water. The microorganism may be transmitted orally and has been detected in dental plaque and saliva. However, the role of the oral cavity in the transmission and recurrence of H. pylori infection has been the subject of debate. A large number of studies investigating the role of oral hygiene and periodontal disease in H. pylori infection have varied significantly in terms of their methodology and sample population, resulting in a wide variation in the reported results. Nevertheless, recent studies have not only shown that the microorganism can be detected fairly consistently from the oral cavity but also demonstrated that the chances of recurrence of H. pylori infection is more likely among patients who harbor the organism in the oral cavity. Furthermore, initial results from clinical trials have shown that H. pylori-positive dyspeptic patients may benefit from periodontal therapy. This paper attempts to review the current body of evidence regarding the role of dental plaque, saliva, and periodontal disease in H. pylori infection.

关键词： Helicobacter pylori dental plaque Saliva Oral cavity Periodontitis Periodontal therapy

dental plaque Segmentation and Quantification using Histogram-aided Fuzzy C-Means Algorithm

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Dental Plaque Segmentation and Quantification using Histogra...

Effects of Adjunctive Daily Blue Light Toothbrushing on dental plaque and Gingival Inflammation—A Randomized Controlled Study

第二十九届中国控制会议

作者： KANG Jiayin 1,2,JI Zhicheng 1 1.School of Communication and Control Engineering,Jiangnan University,Wuxi 214122,P.R.China 2.School of Electronics Engineering,Huaihai Institute of Technology,Lianyungang 222005,P.R.China

There is need to quantify the dental plaque in order to keep fit and prevent vital diseases’*** plaque quantification is very crucial to patients,dentists as well as *** paper presented a method to automatically quantifying the dental plaque in digital tooth images using fuzzy c-means（FCM）clustering algorithm associated with images’histogram *** proposed approach was applied to a clinical database consisting of 30 *** experimental results indicate that the proposed method provides accurate quantitative measurement of dental plaque compared with that of dental plaque indices.

关键词： dental plaque Quantification Fuzzy C-Means Image Segmentation Histogram

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Open Journal of Stomatology 2018年第10期8卷 287-303页

作者： Nadja Bjurshammar Sebastian Malmqvist Gunnar Johannsen Elisabeth Bostrom Jonas Fyrestam Conny Ostman Annsofi Johannsen Department of dental Medicine Division of Oral DiseasesKarolinska InstitutetHuddingeSweden Department of Chemistry-BMC Uppsala UniversityUppsalaSweden Department of Environmental Science&Analytical Chemistry Division of Analytical ChemistryStockholm UniversityStockholmSweden

Phototherapy with blue light emitting diodes (LEDs) is gaining interest because of the efficient antimicrobial benefits reported in several studies in the last decade. The aim in this study was to investigate if a toothbrush with incorporated blue light used in daily oral care can reduce dental plaque and gingival inflammation. An 8-week single-blinded randomized controlled clinical study including 48 subjects compared effects of toothbrushes with/without 450 nm blue LED light emission, on clinical parameters (plaque index, gingival index, bleeding on probing), and on inflammatory markers in saliva and gingival crevicular fluid. Significant reductions in dental plaque and gingival inflammation (p dental plaque was reduced with 57%, and a reduction in gingival inflammation was demonstrated by a decrease in gingival index (GI) with 46% and in bleeding on probing (BOP) with a decrease of 15%. No significant differences were found between the groups at a level of p = 0.05. However, the amount of plaque was reduced by 62% in the blue light group and 51% in the control group, a difference established at a level of p = 0.058. A toothbrush with a 450 nm LED did not show any statistical significant adjunctive effect of toothbrushing regarding reduction in measurements of dental plaque and gingival inflammation.

关键词： Phototherapy Antimicrobial Blue Light dental plaque Gingival Inflammation Toothbrushing

Clinical Assessment of a Pharmaceutical Polyphenol Fruit Extract Gel to Inhibit dental plaque

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Pharmacology & Pharmacy 2021年第9期12卷 177-189页

作者： Steven P. Goh David M. Goh E. Russell Vickers Suite 1 76A Archer St Chatswood NSW 2067 Australia Clinical Stem Cells Sydney Australia

Oral bacteria (e.g. Porphyromonas gingivalis) are associated and potentially co-causative in several medical conditions including Alzheimer’s disease and increased cardiovascular risk. Naturally occurring polyphenols are a developing class of antimicrobial pharmaceutical agents. The use of plant-based polyphenol compounds is an attractive area of medical and dental research due to their high safety factor from their presence in vegetables and fruits. This preliminary study evaluated polyphenols found in berries to reduce bacterial dental plaque accumulation. The study was an in vivo single blind randomized controlled trial of seven subjects with a novel tooth gel using validated measurements. Results showed a significant reduction in plaque accumulation (p = 0.005) and a non-significant trend to reduce gingivitis (p = 0.08). The bioactive gel showed no local or systemic adverse effects and was well tolerated by subjects.

关键词： dental plaque Gingivitis Polyphenol Quercetin Randomized Controlled Trial

Segmentation and Quantification of dental plaque using Modified Kernelized Fuzzy C-Means Clustering Algorithm

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Segmentation and Quantification of Dental Plaque using Modif...

The oral microbiome of pregnant women facilitates gestational diabetes discrimination

2010 Chinese Control and Decision Conference

作者： Jiayin kang~(1,2),Zhicheng Ji~1,Chenglong Gong~2 1.School of Communication and Control Engineering,Jiangnan University,Wuxi 214122,China 2.School of Electronics Engineering,Huaihai Institute of Technology,Lianyungang 222005,China

＜正＞This paper presented an approach for automatically quantifying the dental plaque based on modified kernelized fuzzy *** proposed approach was applied to a clinical database consisting of 30 *** experimental results show that the proposed method provids accurate quantitative measurement of dental plaque compared with that of traditional manual measurement indices of the dental plaque.

关键词： dental plaque Segmentation Kernelized Fuzzy C-Means Kernel-Induced Distance

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Journal of Genetics and Genomics 2021年第1期48卷 32-39页

作者： Xiaoqing Li Jiayong Zheng Xiuling Ma Bing Zhang Jinyang Zhang Wenhuan Wang Congcong Sun Yeping Wang Jianqiong Zheng Haiying Chen Jiejing Tao Hai Wang Fengyi Zhang Jinfeng Wang Hongping Zhang Wenzhou People’s Hospital/Wenzhou Maternal and Child Health Care Hospital/The Third Clinical Institute Affiliated to Wenzhou Medical University Wenzhou 325000China Computational Genomics Lab Beijing Institutes of Life ScienceChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

The oral microbiota plays an important role in the development of various diseases,whereas its association with gestational diabetes mellitus (GDM) remains largely *** aim of this study is to identify biomarkers from the oral microbiota of GDM patients by analyzing the microbiome of the saliva and dental plaque samples of 111 pregnant *** find that the microbiota of both types of oral samples in GDM patients exhibits differences and significantly varies from that of patients with periodontitis or dental *** bacterial biomarkers from the oral microbiota,GDM classification models based on support vector machine and random forest algorithms are *** area under curve (AUC) value of the classification model constructed by combination of Lautropia and Neisseria in dental plaque and Streptococcus in saliva reaches 0.83,and the value achieves a maximum value of 0.89 by adding clinical *** findings suggest that certain bacteria in either saliva or dental plaque can effectively distinguish women with GDM from healthy pregnant women,which provides evidence of oral microbiome as an informative source for developing noninvasive biomarkers of GDM.

关键词： Gestational diabetes mellitus Oral microbiome Saliva dental plaque Classification model

Characterization of oral bacterial diversity of irradiated patients by high-throughput sequencing

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International Journal of Oral Science 2013年第1期5卷 21-25页

作者： Yue-Jian Hu Qian Wang Yun-Tao Jiang Rui Ma Wen-Wei Xia Zi-Sheng Tang Zheng Liu Jing-Ping Liang Zheng-Wei Huang Department of Endodontics Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghai Key Laboratory of Stomatology Department of Endodontics The Affiliated Stomatology Hospital of Tongji University Tongji University School of Stomatology

The objective of this study was to investigate the compositional profiles and microbial shifts of oral microbiota during head-and-neck *** analysis based on 16S rRNA gene pyrosequencing was performed to assess the diversity and variation of oral microbiota of irradiated *** patients with head and neck cancers were involved in this *** each patient, supragingival plaque samples were collected at seven time points before and during radiotherapy.A total of 147 232 qualified sequences were obtained through pyrosequencing and bioinformatic analysis,representing 3 460 species level operational taxonomic units(OTUs) and 140 genus level *** variations were observed across different time points and supported by cluster analysis based on weighted UniFrac ***,the low evenness of oral microbial communities in relative abundance was revealed by Lorenz *** study contributed to a better understanding of the detailed characterization of oral bacterial diversity of irradiated patients.

关键词： dental plaque head-and-neck radiotherapy microbial diversity oral microbiota pyrosequencing

A Study of plaque Adhesion during Implant Treatment of Missing Molars

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Open Journal of Stomatology 2022年第3期12卷 96-102页

作者： Yuka Hasegawa Yu Kishimoto Yasunori Kanemitsu Toshiichiro Tanabe Kuniteru Nagahara Tetsuji Nakamoto Department of Maxillofacial Implant School of Dentistry Asahi University Mizuho Japan Medical and dental Center Asahi University Mizuho Japan

Purpose: In implant treatment, the abutments and superstructures form a transmucosal area. In addition to providing appropriate cleaning instructions to patients, its material properties must be carefully considered. It is not clear how much plaque adhesion occurs at each site during treatment process, and the effect of materials on plaque adhesion. Methods: In this study, 33 patients, 13 maxillary cases and 20 mandibular cases, who had implants placed in the missing molars were evaluated for the plaque adhesion of provisional restorations made of acrylic resin and monolithic zirconia final restoration after a period of more than 4 weeks. In addition, oral hygiene instructions were thoroughly given for 12 cases at the time of staining after the provisional restorations, and re-evaluated in 4 weeks. Results: About 20% of the buccal-lingual area of the prosthetic device fabricated with acrylic resin showed plaque staining, whereas about 40% of the area of the mesial and distal. On the other hand, for the zirconia final restorations, the percentage of staining was about 5% for buccal and lingual surface and 10% for mesial and distal surface. The stained area ratio of the provisional restoration correlated with the zirconia superstructure area ratio. Even with careful oral hygiene, it became clear that the amount of plaque adhesion due to the difference in materials could not be overcome. Conclusion: The zirconia superstructure is extremely good from the viewpoint of plaque adhesion, but cases with a large stained area at the time of provisional restoration should be carefully followed up.

关键词： Superstructure dental plaque Yttria-Stabilized Zirconia Polymethyl Methacrylate

Characterizing Diversity of Lactobacilli Associated with Severe Early Childhood Caries: A Study Protocol

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Advances in Microbiology 2015年第1期5卷 9-20页

作者： Yihong Li Silvia Argimón Catherine N.Schon Prakaimuk Saraithong Page W.Caufield Department of Basic Science and Craniofacial Biology College of DentistryNew York UniversityNew YorkUSA Department of Cariology and Comprehensive Care College of DentistryNew York UniversityNew YorkUSA

Lactobacilli have been consistently associated with dental caries for decades;however, knowledge of this group of bacteria in the etiology of the disease is limited to quantitative elucidation. Nowadays, explicit identification of oral Lactobacillus species is possible, despite their taxonomic complexity. Here we describe a combined approach involving both cultivation and genetic methods to ascertain and characterize the diversity and abundance of the Lactobacillus population in the oral cavities of children with severe early childhood caries (S-ECC). Eighty 3- to 6-year-old children (40 S-ECC and 40 caries free) who were seeking dental care at the Pediatric dental Clinic of Bellevue Hospital in New York City were invited to participate in this study. Clinical data on sociodemographic information and oral health behavior were obtained from the primary caregiver. The data included a detailed dental examination, children’s medical history, and a questionnaire survey. Combined non-stimulated saliva and supragingival plaque samples were collected from each child and cultivated on selective media for quantitative measures of lactobacilli levels. The procedure for Lactobacillus species screening will include the random selection of 50 colonies per plate, ex- traction of DNA from each colony, and genotyping by arbitrarily primed polymerase chain reaction (AP-PCR). Each unique Lactobacillus AP-PCR genotype will be selected for taxonomic assessment by 16S rRNA gene sequencing analysis. Lactobacillus species will be identified by comparing the 16S rRNA sequences with the Ribosomal Database and the Human Oral Microbiome Database. Meanwhile, the same set of clinical samples will be independently subjected to genomic DNA isolation, 16S rRNA amplification with Lactobacillus genus-specific primers, sequencing, and taxonomic identification, both at genus and species levels with a customized pipeline. The distribution and phylogenetic differences of these Lactobacillus species will

关键词： Lactobacilli Early Childhood Caries Bacterial Diversity 16S rRNA AP-PCR Saliva dental plaque