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Dentistry Commons™

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2018

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Articles 451 - 458 of 458

Full-Text Articles in Dentistry

Association Between Chronic Periodontitis And Hypertension Among Thai Adults, Ploysiri Rassamee Jan 2018

Association Between Chronic Periodontitis And Hypertension Among Thai Adults, Ploysiri Rassamee

Chulalongkorn University Theses and Dissertations (Chula ETD)

Previous studies suggest that periodontitis may be associated with an increasing risk of hypertension. However, data from large epidemiological studies are limited. The aim of this cross-sectional study was to examine the association between periodontitis and hypertension using data from a cohort study in a Thai population. The study population comprised of 1,378 employees of the Electricity Generating Authority of Thailand (EGAT), aged 53 to 73 years old, were categorized into no/mild, moderate, or severe periodontitis groups. Hypertension was determined as having systolic blood pressure 140 mmHg or more or diastolic blood pressure 90 mmHg or more, or taking antihypertensive …

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Gene Expression Of Bcl2a1 และ Cxcl9 In Soft Tissue Covering Bone Grafting Materials, Borwonluk Taveedach Jan 2018

Gene Expression Of Bcl2a1 และ Cxcl9 In Soft Tissue Covering Bone Grafting Materials, Borwonluk Taveedach

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study was to assess the expression of Bcl2a1 and Cxcl9 genes in soft tissues covering bone grafted with demineralized freeze-dried bone allograft (DFDBA) and deproteinized bovine bone mineral (DBBM) in comparison with ones covering without grafting. The animals were randomly separated into three groups of treatment. Calvarial defect models were created on parietal bones. Bare defect models without bone graft as a control group. After one and three months, animals were sacrificed. Soft tissues covering the defected area were collected by punch technique. RNA was isolated and proceeded to Real-time reverse transcription quantitative polymerase chain reaction (RT-qPCR). Statistical analysis …

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Effect Of Methyl Formate-Methyl Acetate Treatment On Flexural Strength Between Denture Base And Self-Cured Hard Reline Materials, Mongkol Puangpetch Jan 2018

Effect Of Methyl Formate-Methyl Acetate Treatment On Flexural Strength Between Denture Base And Self-Cured Hard Reline Materials, Mongkol Puangpetch

Chulalongkorn University Theses and Dissertations (Chula ETD)

The purpose of this study was to evaluate the effect of methyl formate-methyl acetate (MF-MA) surface treatment on the flexural strength between denture base and hard reline materials. 180 heat-cured acrylic denture base (Meliodent®) specimens were prepared according to ISO 20795-1 (2013) and divided into 18 groups with various autopolymerizing hard reline materials. Group I-III: relined with Unifast Trad®, Group IV-VI: relined with Kooliner® Group VII-IX: relined with Tokuyama® Rebase II Fast (without adhesive, with hardener), Group X-XII: relined with Tokuyama® Rebase II Fast (with adhesive and hardener), Group XIII-XV: relined with Tokuyama® Rebase II Fast (without adhesive and hardener), …

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Color Stability, Water Sorption And Water Solubility Of Various Artificial Acrylic Resin Teeth, Piyaporn Foungfu Jan 2018

Color Stability, Water Sorption And Water Solubility Of Various Artificial Acrylic Resin Teeth, Piyaporn Foungfu

Chulalongkorn University Theses and Dissertations (Chula ETD)

Color stability, water sorption and water solubility of the acrylic resin artificial teeth are the success keys to the appearance and mechanical properties of the denture teeth. The objective of the present study was to compare the color stability, water sorption and water solubility of 3 commercial artificial teeth: linear PMMA (NEW), resin composite (CPX) and cross-linked PMMA (ANT) and 1 color-liked heat-polymerized acrylic resin (MAJ). 80 colume-shaped specimens (9 mm/ 2 mm thickness) were fabricated for color stability test using a spectrophotometer after immersing in water or coffee solution at 1, 7, 28, 56 and 84 days. 40 colume-shape …

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Fracture Resistance Of Non-Ferruled Endodontically Treated Teeth Restored With Different Fiber Post And Core Methods After Five Years Fatigue Loading, Puriwat Malakorn Jan 2018

Fracture Resistance Of Non-Ferruled Endodontically Treated Teeth Restored With Different Fiber Post And Core Methods After Five Years Fatigue Loading, Puriwat Malakorn

Chulalongkorn University Theses and Dissertations (Chula ETD)

The aim of this study was to compare the fracture resistance and failure mode of non-ferruled ETT restored with different fiber post and core methods after five years in vitro fatigue loading. Forty-eight uniradicular lower first premolar teeth were decoronated, endodontically treated and prepared for the post space. The prepared specimens were divided into four groups (n=12): single fiber-reinforced composite (FRC) post and flowable resin composite core (Group I), FRC post with an accessory fiber post and flowable resin composite core (Group II), resin composite relined FRC post and resin composite core (Direct anatomic post)(Group III), and resin composite relined …

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Effect Of Different Polishing Systems, Forces, And Durations On Surface Roughness And Phase Transformation Of Monolithic Zirconia, Songsak Munkongsujarit Jan 2018

Effect Of Different Polishing Systems, Forces, And Durations On Surface Roughness And Phase Transformation Of Monolithic Zirconia, Songsak Munkongsujarit

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aimed to determine the effect of polishing systems, forces and durations on the surface roughness and phase transformation of zirconia. 72 pieces of fully sintered zirconia size 7 x 5 x 4 mm were fabricated with CAD/CAM, then divided into nine groups depending on the polishing systems and forces. All specimens were ground with fine diamond bur as the control, and initial surface roughness (Ra) was measured. The samples were then polished with one of the zirconia polishing systems (Diazircon or Komet ZR) or porcelain polishing system (Ceramaster), with forces at 1, 2 and 3 newtons. The polishing …

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Effect Of Various Curing Conditions In Pressure Cooker On Flexural Strength Of Denture Hard Relining Materials, Thassanee Suwannachote Jan 2018

Effect Of Various Curing Conditions In Pressure Cooker On Flexural Strength Of Denture Hard Relining Materials, Thassanee Suwannachote

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study evaluated the effect of various curing conditions in pressure cooker on flexural strength of hard chairside reline resins (UnifastTM Trad, Tokuyama® Rebase II Fast with and without Hardener®). For each material, 70 specimens were prepared and divided into 7 groups consists of control group and 6 experimental groups: cured in 2 bars air or nitrogen pressure cooker at 55ºC for 10, 15 and 20 min respectively. For Hardener® groups, specimens were soaked in Hardener® for 3 min after curing. The flexural strength was tested using a Universal testing machine. The data were analyzed using Three-way ANOVA, One-way ANOVA …

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Comparison Of The Stem Cell Characteristics Among Periodontium-Derived Human Mesenchymal Stem Cells, Manutsanun Choosiri Jan 2018

Comparison Of The Stem Cell Characteristics Among Periodontium-Derived Human Mesenchymal Stem Cells, Manutsanun Choosiri

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objective: To investigate and compare the characteristics of human mesenchymal stem cells (MSCs) among 3 different stem cell sources in periodontium; periodontal ligament (PDL) tissue, marginal gingival tissue (MG), and supra-crestal gingival connective tissue (SG). Materials and Methods: PDL-MSCs, MG-MSCs, and SG-MSCs were obtained from 4 subjects with healthy periodontal condition. The characteristics of 3 types of MSCs were compared in terms of an expression of MSCs markers, colony-forming ability (CFA), cell proliferation, alkaline phosphatase (ALP) activity, osteogenic and adipogenic potential. Results: Flow cytometry revealed a similar pattern of MSCs marker expression among 3 cells types with positive expression of …

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