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2017

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Ferrocene-Bearing Tea Polyphenol Particles As Anticancer Drug Carriers, Punnawich Phaiyarin Jan 2017

Ferrocene-Bearing Tea Polyphenol Particles As Anticancer Drug Carriers, Punnawich Phaiyarin

Chulalongkorn University Theses and Dissertations (Chula ETD)

Ferrocene is a redox moiety that can be positively charged upon being oxidized. Thus, it is possible to use this moiety to make a polymer platform that is redox responsive regarding their water solubility. Here we prepared polymerized EGCG nanoparticles (pEGCG) and polymerized EGCG gum (pEGCG-gum) from tea polyphenol EGCG. Ferrocene was grafted onto the polymerized tea polyphenol and the obtained polymers were allowed to self-assemble into water-insoluble and indispersible sub-micron particles. The water-insoluble ferrocene-bearing particles became water-dispersible particles with nanometer sizes upon being oxidized by hydrogen peroxide. The oxidized particles, Fc-pEG-gum can inhibit growth of HepG2 liver cancer cells …

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Colorimetric Detection Of Cysteine Using Silver-Hydroxyapatite Nanoparticles, Retno Prasetia Jan 2017

Colorimetric Detection Of Cysteine Using Silver-Hydroxyapatite Nanoparticles, Retno Prasetia

Chulalongkorn University Theses and Dissertations (Chula ETD)

Cysteine is a sulphur-containing amino acid that acts as an effective antioxidant in human body. An excessive amount of cysteine leads to cystine formation that causes the stone formation in kidney, bladder, and ureters. A new method was developed for detection of cysteine in urine samples based on the aggregation of silver nanoparticles (AgNPs) on Hydroxyapatite (HAp) in the presence of cysteine. Transmission Electron Microscope (TEM) was used to observe the morphology of prepared HAp and AgNPs on HAp. The presence of cysteine of different concentrations resulted in different cluster sizes of AgNPs on HAp and hence different solid color. …

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Synthesis And Cytotoxicity Evaluation Of Gold Nanoparticles/Pullulan Derivatives For Cancer Treatment, Sakchai Laksee Jan 2017

Synthesis And Cytotoxicity Evaluation Of Gold Nanoparticles/Pullulan Derivatives For Cancer Treatment, Sakchai Laksee

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study focused on the development of multifunctional gold nanoparticles (AuNPs) using pullulan derivatives as a trifunctional reducing, stabilizing and capping agent for targeted delivery of camptothecin (CPT) or doxorubicin (DOX) in order to enhance their efficacy and reduce side effects. The surface of AuNPs was functionalized to contain 3 beneficial components on pullulan as followed: (i) quat188 as a positive charge to increase cellular uptake and activities, (ii) para-aminobenzoic acid (PABA) as a hydrophobic molecule to enhance biocompatibility, and (iii) folic acid (FA) as a targeting ligand to bind with folate receptor on cancerous cell membranes and enhance intracellular …

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Colorimetric Determination Of Thiocyanate Ion Using Modified Polymer Resins, Sujinda Khaosaard Jan 2017

Colorimetric Determination Of Thiocyanate Ion Using Modified Polymer Resins, Sujinda Khaosaard

Chulalongkorn University Theses and Dissertations (Chula ETD)

A new method for thiocyanate determination in milk samples based on the formation of dithiocyanato dipyridine copper(II) [Cu(SCN)2(Py)2] complex on polymer resin surface is proposed. Amberlite XAD-7 resin on was modified with copper-pyridine complex and used as the material for detection. The color of resin changed from blue to green with the increase of thiocyanate concentration. It could be observed by naked-eye and the color intensity used as quantitative data was measured via Image-J software. The effect of various parameters was investigated including Cu2+ concentration, time for resin modification with reagents, sample volume, detection time and pyridine volume. Under the …

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Characterization Of Non-Volatile Compounds In Tom Yum Soup Using High Performance Liquid Chromatography-Tandem Mass Spectrometry, Wanabud Wongbubpha Jan 2017

Characterization Of Non-Volatile Compounds In Tom Yum Soup Using High Performance Liquid Chromatography-Tandem Mass Spectrometry, Wanabud Wongbubpha

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this work, high performance liquid chromatography hyphenated with tandem mass spectrometry (HPLC-MS/MS) was developed and validated for simultaneous determination of 31 targeted non-volatile compounds, such as 2 organic acids, 20 amino acids and 9 phenolic acids, in Tom Yum ingredient, Tom Yum soup made from the fresh ingredients and commercial Tom Yum pastes, where the main Tom Yum ingredients include galangal, lemongrass, kaffir lime leaves, Bird's eye chili, lime juice and fish sauce. The following HPLC-MS/MS conditions were used: a PoroShell C18 column (4.6 x 100 mm, 2.7 µm) using a gradient elution of A:B mobile phase at a …

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Factors Affecting Building Damage And People's Preparedness For Earthquake In Chiang Rai, Narongdej Intaratchaiyakit Jan 2017

Factors Affecting Building Damage And People's Preparedness For Earthquake In Chiang Rai, Narongdej Intaratchaiyakit

Chulalongkorn University Theses and Dissertations (Chula ETD)

On May 5, 2014, an earthquake with a magnitude of 6.3 on the Richter scale occurred in Chiang Rai, Thailand. This earthquake was the strongest earthquake in Thailand at the Mae Lao District region. It also caused building damage and casualties. In this research, 277 participants living in village no.2 and village no.7 of Dong Mada, a sub-district at Mae Lao district in Chiang Rai, were selected. A questionnaire was used to interview these participants, and the data were analyzed by Chi-square, Fisher's exact test, a Mann-Whitney U test, and a Kruskal-Wallis test. The objective of this study was to …

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Mechanisms Of Thai Medicinal Plant Extracts On The Attenuation Of Glutamate-Mediated Neurotoxicity, Anchalee Prasansuklab Jan 2017

Mechanisms Of Thai Medicinal Plant Extracts On The Attenuation Of Glutamate-Mediated Neurotoxicity, Anchalee Prasansuklab

Chulalongkorn University Theses and Dissertations (Chula ETD)

As the world population ages, neurodegenerative diseases, particularly Alzheimer's disease, are becoming a major public health concern with increasing incidence and prevalence worldwide while no cure currently exists. To challenge this situation, herbal medicine may provide a potential alternative treatment as use of natural-derived substances has been proven to be effective in the prevention and/or treatment of several diseases. During the past decades, increasing evidence has implicated excessive glutamate levels in the pathway of neuronal cell death. Thailand is a place known for cultivating a variety of tropical plants and herbs, so far many of them have never been examined …

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Effects Of Plant Extracts On Melanin Biosynthesis And Melanogenetic Gene Expression In B16f10 Melanoma Cells, Moragot Chatatikun Jan 2017

Effects Of Plant Extracts On Melanin Biosynthesis And Melanogenetic Gene Expression In B16f10 Melanoma Cells, Moragot Chatatikun

Chulalongkorn University Theses and Dissertations (Chula ETD)

Ultraviolet radiation from sunlight is a significant environmental factor in skin damage and can induce hyperpigmentation disorder and aesthetic problem. Development of novel whitening phytochemical compounds from natural products has been become trends recently. The purpose of this study was to find some plant extracts that reduce melanin synthesis and melanogenetic gene expression in alpha-MSH-induced B16F10 mouse melanoma cells. To screen total phenolics and flavonoids, antioxidant activity, and anti-mushroom tyrosinase activity, we used 13 plants which were extracted with petroleum ether, dichloromethane and ethanol solvents, subsequently. We found that total phenolic content of 13 plants extracts was found in the …

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Role Of Progesterone Receptor A And B Isoforms In Lung Neuroendocrine Tumors, Teeranut Asavasupreechar Jan 2017

Role Of Progesterone Receptor A And B Isoforms In Lung Neuroendocrine Tumors, Teeranut Asavasupreechar

Chulalongkorn University Theses and Dissertations (Chula ETD)

Lung neuroendocrine tumors (NETs) incidences are increasing in recent years. Women with lung NETs have significantly better survival rates as compared to men suggesting the involvement of sex steroids and their receptors in the progression of lung NETs. Recent data suggested that progesterone receptor (PR) may play a role in the survival of lung NET patients. PR exists as two major isoforms, PRA and PRB. How expression of PR isoforms affects proliferation of lung NETs and patient's survival is not known. To determine the role of PR isoforms in lung NETs, we constructed H727 lung NET cell models expressing PRB …

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Protein Profiling Analysis Of Platelets In Hypercoagulable State Of Β-Thalassemia/Hbe Patients, Puangpaka Chanpeng Jan 2017

Protein Profiling Analysis Of Platelets In Hypercoagulable State Of Β-Thalassemia/Hbe Patients, Puangpaka Chanpeng

Chulalongkorn University Theses and Dissertations (Chula ETD)

β-thalassemia/HbE is an inherited hemolytic anemia caused by defect in β-globin synthesis resulting in accumulation of excess α-globin chains in red blood cells. A hypercogulable state leading to high risk of thromboembolic event is one of the most common complications observed in this disease, particularly in patients with splenectomy. Previous studies suggested that increased platelet activation and coagulation factors in β-thalassemia/HbE intermediate patients promote the hypercoagulable state. However, the hypercoagulable state as well as the molecular mechanism regarding this pathogenesis in β-thalassemia/HbE is not yet well understood. This study aimed to identify proteins related to platelet activation and to hypercoagulable …

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Comparison Between Digital Image Analysis And Visual Assessment Of Immunohistochemical Her2 Expression In Breast Cancer, Morten Ragn Jakobsen Jan 2017

Comparison Between Digital Image Analysis And Visual Assessment Of Immunohistochemical Her2 Expression In Breast Cancer, Morten Ragn Jakobsen

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background: Assessment of HER2 status is considered standard of care in the histopathologic workup of breast cancer and conveys prognostic and predictive information used to guide treatment decisions. The assessment is often carried out in a two-step approach where immunohistochemical expression of HER2 protein is first evaluated by conventional microscopy and equivocal cases are further analyzed by in-situ hybridization techniques to assess gene amplification status. Methods: In this study we compared conventional manual assessment of immunohistochemical HER2 expression with digital image analysis (DIA) and consensus manual assessment by a panel of three pathologists. From our archive we retrieved sections of …

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Histopathologic Difference Between Sinonasal Mucosa And Polyp Tissue For Diagnosing Eosinophilic Chronic Rhinosinusitis, Wanrawee Thaitrakool Jan 2017

Histopathologic Difference Between Sinonasal Mucosa And Polyp Tissue For Diagnosing Eosinophilic Chronic Rhinosinusitis, Wanrawee Thaitrakool

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aims to assess the appropriate site for diagnosing eosinophilic chronic rhinosinusitis (ECRS) by histopathology. Patients with chronic rhinosinusitis with polyps (CRSwNP) were enrolled. Specimens were collected from polyp apex, polyp pedicle, polyp scraping and ethmoid mucosa. Number of tissue eosinophil of the four samples was assessed with intrapersonal comparison for diagnosing ECRS. Correlations with clinical characteristics of ECRS were assessed for each site. Results showed that thirty patients with CRSwNP were enrolled. Polyp apex, polyp pedicle and ethmoid mucosa gave similar results for diagnosing ECRS in 16 patients (53.3%). Median tissue eosinophil was greater in polyp apex (84, …

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Biological-Like Memory Allocation Scheme Simulation, Gasydech Lergchinnaboot Jan 2017

Biological-Like Memory Allocation Scheme Simulation, Gasydech Lergchinnaboot

Chulalongkorn University Theses and Dissertations (Chula ETD)

When Gordon Moore observed the number of transistor increasing pattern while memory bandwidth could not catch up with processing unit performance, this diverging rate kept stretching out to create what eventually transpired to be “Memory Wall.” This consequence becomes a major performance bottleneck. Many bottleneck elimination approaches have been attempted. They incorporate considerable overhead and high complexity. This research proposes a novel memory allocation scheme that employs biological behavioral principles of the living creatures. At the principal construct of their life form lives the cells having limited resources, yet passively operates with little overhead. The proposed method imitates this unicellular …

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Development Of In Situ Gel For Artificial Saliva And Satisfaction Study, Rawi Tishyadhigama Jan 2017

Development Of In Situ Gel For Artificial Saliva And Satisfaction Study, Rawi Tishyadhigama

Chulalongkorn University Theses and Dissertations (Chula ETD)

Xerostomia, the subjective complaint about the dry mouth, may lead to the difficulty in daily living including speaking, swallowing, taste acuity and sleeping. Patients are often advised to drink water or chew ice to moisturize the oral cavity and also recommended to use stimulant or saliva substitute, such as sour candies, chewing gum and artificial saliva. In Thailand, there is no artificial saliva products available in the market and this makes it difficult to access the artificial saliva. Hence, artificial saliva have been developed in the form of solution in many hospitals to dispense for xerostomia patients in the hospitals. …

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Socioeconomic Determinants Of Happiness Of The Elderly In Bhutan, Tashi Duba Jan 2017

Socioeconomic Determinants Of Happiness Of The Elderly In Bhutan, Tashi Duba

Chulalongkorn University Theses and Dissertations (Chula ETD)

Elderly in Bhutan are rising steadily as a proportion of total population. In 2015, population older than 60 constituted about 7.3% of the total population compared to 6.9% in 2010. By 2030, the elderly population is estimated to reach 10.1% of total population. Along with growing numbers of elderly in Bhutan and rapid socioeconomic transformations, the individual-level of happiness decreases with age, the lowest being among the elderly (the Gross National Happiness Index surveys of 2010 and 2015 and Bhutan Living Standard Survey 2012). Nevertheless, there is limited literature exploring factors that are associated with happiness of the elderly. This …

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Tobacco Use, Health Care Utilization, Household Expenditure And Smoking Cessation In China, Changle Li Jan 2017

Tobacco Use, Health Care Utilization, Household Expenditure And Smoking Cessation In China, Changle Li

Chulalongkorn University Theses and Dissertations (Chula ETD)

This dissertation studied the tobacco use impact of on health care utilization, household expenditure, and self-rated health among rural residents in rural China. The 2010-2014 China Family Panel Studies data were employed here. Moreover, this study also conducted the randomized controlled trial and analyzed the cost-effectiveness smoking cessation intervention among college-aged smokers in Inner Mongolia, China. The main findings showed: (1) Current and former smokers use more outpatient care than non-smokers. Moreover, former smokers use more inpatient care than non-smokers in rural China. (2) Long-term quitters decreased the probability of using inpatient care compared with recent and moderate-term quitters in …

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Optimal Sizing, Siting, And Scheduling Of Bess For Mitigatingvoltage Problem In Distribution Utilities With Highpenetration Of Pv Rooftops, Anh Thi Nguyen Jan 2017

Optimal Sizing, Siting, And Scheduling Of Bess For Mitigatingvoltage Problem In Distribution Utilities With Highpenetration Of Pv Rooftops, Anh Thi Nguyen

Chulalongkorn University Theses and Dissertations (Chula ETD)

For ambition of reducing CO2 emission and reliance on fossil fuels, solar power generation has been received special supports and deployed rapidly in many distribution networks. However, with a high presence of solar power generation, power grid control is no longer simple as conventional one due to natural variation of solar power and large space dispersion of solar power systems. The negative impacts comprise power system stability, electric power quality involving frequency and voltage criteria and other potential issues. Among these impacts, voltage problem is most obvious. Many solutions have been proposed to solve the voltage problem whereas battery energy …

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Education Management Reform Strategies For Enhancing The Quality Citizenship In Cambodia, Chuonnaron Hang Jan 2017

Education Management Reform Strategies For Enhancing The Quality Citizenship In Cambodia, Chuonnaron Hang

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research study aimed to 1) study the conceptual framework of education management reform and the quality citizenship; 2) study the current and desirable state of education management reform for enhancing the quality citizenship in Cambodia; 3) find out the needs in education management reform for enhancing the quality citizenship in Cambodia; 4) develop education management reform strategies for enhancing the quality citizenship in Cambodia. This study employed the research and development method (R&D). The data were collected from 710 respondents, consisting of 10 education policymakers, 30 Directors of MoEYS departments, 80 school administrators, 150 teachers, 80 School Support Committee …

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Determination Of Waste Treatment Fee Pricing Mechanism For Municipal Solid Waste By Mechanical Biological Treatment Method Utilising The Public Private Partnership Model In Thailand, Adrian Paul Raj Jan 2017

Determination Of Waste Treatment Fee Pricing Mechanism For Municipal Solid Waste By Mechanical Biological Treatment Method Utilising The Public Private Partnership Model In Thailand, Adrian Paul Raj

Chulalongkorn University Theses and Dissertations (Chula ETD)

Private participation in the development of municipal solid waste treatment projects through public-private partnership models accelerate the implementation of sustainable treatment technologies such as Mechanical Biological Treatment (MBT) facilities within developing countries without creating excessive burden to government infrastructure investment. The introduction of preset pricing mechanism to regulate potential waste treatment fee structure based on pre-determined project internal rate-of-return mitigates multi-party risks, such as the potential developer project losses or the opportunity to profiteer. Research encompasses technical assessment of project requirements for implementation of required technologies, commercial analysis of project capital expenditure (CAPEX), operational expenditure (OPEX) and assessment of revenue …

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Establishing A Luggage Handling Service Company, Anan Prasertrungreung Jan 2017

Establishing A Luggage Handling Service Company, Anan Prasertrungreung

Chulalongkorn University Theses and Dissertations (Chula ETD)

Luggage delivery service has never existed in Thailand officially but already established in another country such as Japan. However, this service has a potential to be a very good service as it could benefit to traveler which Thailand has welcomed more than 30m of them per annum but the model from another country could not be implement directly to Thailand. By developing the model, this service will fit to Thai's market. There are many risks that researcher has to consider before starting the business to avoid or prevent risks into the business. Moreover, this study will not limit only the …

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A Comparative Assessment Of Self-Consumption Support Schemes For Rooftop Pv Systems In Thailand, Kespanerai Kokchang Jan 2017

A Comparative Assessment Of Self-Consumption Support Schemes For Rooftop Pv Systems In Thailand, Kespanerai Kokchang

Chulalongkorn University Theses and Dissertations (Chula ETD)

The growth in the adoption of solar photovoltaic (PV) power generation systems has been accelerating around the world, contributing to the debate about the future of policy and regulation in a high distributed energy resources future. Thailand is one of the leaders in solar investment in Southeast Asia. It has recently shifted its policy framework from subsidizing power export through feed-in tariffs toward a policy that is focused on supporting self-consumption of PV electricity. There are three possible forms of self-consumption support scheme: net metering, net billing, and self-consumption only. Net metering and net billing are electricity policies to assign …

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The Socio-Economic Impact Of Iuu-Fishing And Its Countermeasures On Small Scale Fishermen In Thailand : A Case Study Of Baan Khan Kradai, Ao Noi, Prachuap Kiri Khan, Roman Zwoelfer Jan 2017

The Socio-Economic Impact Of Iuu-Fishing And Its Countermeasures On Small Scale Fishermen In Thailand : A Case Study Of Baan Khan Kradai, Ao Noi, Prachuap Kiri Khan, Roman Zwoelfer

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study investigates the socio-economic effects of Illegal, Unreported and Unregulated fishing (IUU-fishing) on households of small scale fishermen, whose income derives almost entirely from fishing. The research question is "What are the socio-economic impacts of IUU-fishing and government's countermeasures on Thai fishing communities, in particular small scale fishermen's households, before and after 2015?". A mixed quantitative and qualitative approach was chosen to better grasp the complexity of fishing-related changes to household income and by the case study of a small scale fishing community in Ao Noi Subdistrict of Prachuap Kiri Khan Province. This resulted to a general understanding of …

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Drivers And Constraints Of Conversion To Organic Farming In The Kingdom Of Bhutan, Parladh Mahat Jan 2017

Drivers And Constraints Of Conversion To Organic Farming In The Kingdom Of Bhutan, Parladh Mahat

Chulalongkorn University Theses and Dissertations (Chula ETD)

Organic farming is one of the several approaches towards environmental conservation and aims to increase agricultural production and household income for small-scale farmers to enable them to come out of poverty and improve livelihood. The objective is to investigate the key drivers and constraints in conversion to organic farming for domestic organic certified and non-certified but organic farmers and provide policy recommendation to government and relevant agency. The survey data of 146 respondents comprising of certified organic (n=47) and non-certified (n=99) were collected from Gasa district of Bhutan during the month of October 2017. The data analysis includes the use …

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Roles Of Dissimilatory Nitrate Reduction To Ammonium In Biological Nitrogen Removal System, Pokchat Chutivisut Jan 2017

Roles Of Dissimilatory Nitrate Reduction To Ammonium In Biological Nitrogen Removal System, Pokchat Chutivisut

Chulalongkorn University Theses and Dissertations (Chula ETD)

Biological nitrogen removal system is a wastewater treatment process that normally utilizes nitrification-denitrification to convert nitrogen wastes to unharmful gaseous products. However, apart from these two pathways, dissimilatory nitrate reduction to ammonium (DNRA) can also compete with denitrification for nitrate and yield ammonium waste as the end product. The aim of this research is to extend knowledge on the DNRA pathway, including the study on its occurrence and microorganisms responsible for the process. To observe the presence of DNRA, microbial sludge from aquacultures which utilized biological nitrogen removal processes was applied to examine the pathway of DNRA in these systems. …

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Development Of Novel Electrocoagulation Reactor (Ecr) For Turbidity Removal And Decolorization From Textile Industry Wastewater, Penghour Hong Jan 2017

Development Of Novel Electrocoagulation Reactor (Ecr) For Turbidity Removal And Decolorization From Textile Industry Wastewater, Penghour Hong

Chulalongkorn University Theses and Dissertations (Chula ETD)

High concentration of dyes together with turbidity were frequently found in the effluents of textile industry wastewater, which are the toxic substances. To remove these contaminants, the combination between electrocoagulation process (EC) and separation has been proposed in this study. The objective of this present work is to design and evaluate the new electrocoagulation reactor (ECR) for treating dye and turbidity from synthetic textile wastewater. The optimization of electrode configuration and design parameter were examined with the batch column reactor for containing 4 liters of wastewater. The result showed that monopolar arrangement within the inner gap 1.5 cm and current …

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Evaluation Of Push Out Bond Strength Of Glass Fiber Post Related With Ultrasonic Irrigation, Nomjit Vidhyaphum Jan 2017

Evaluation Of Push Out Bond Strength Of Glass Fiber Post Related With Ultrasonic Irrigation, Nomjit Vidhyaphum

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objective This study compared the bond strength of glass fiber post to dentin using different irrigation methods and solutions and to evaluate the bond strength in different regions of the root. Methods One hundred human anterior maxillary teeth were randomly divided into 10 groups (n=10). Root canal filling and post space preparation were carried out followed by diverse final irrigation techniques. Groups 1 to 3 underwent syringe irrigation, groups 4 to 6 irrigation with ultrasonic instrumentation and groups 7 to 9 passive ultrasonic irrigation. Different irrigant solutions were used in each groups as 2.5% NaOCl (groups 1,4,7), 17% EDTA (groups …

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Microleakage Of Enamel Preservation At Gingival Wall Of Class Ii Resin Composite Restorations (Nanofilled Vs Bulk-Fill), Onladda Pisuttiwong Jan 2017

Microleakage Of Enamel Preservation At Gingival Wall Of Class Ii Resin Composite Restorations (Nanofilled Vs Bulk-Fill), Onladda Pisuttiwong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objectives. This in vitro study tested the hypothesis that preserving a thin enamel layer at the gingival margin and using bulk-fill resin composites could minimize microleakage of class II resin composite. Materials and Methods. Thirty-six human third molars were randomly divided into three groups of 12 specimens each: Filtek Bulk Fill Posterior Restorative in Capsules (BFC), Filtek Bulk Fill Posterior Restorative in Syringes (BFS) and Filtek Z350 XT (Z350). Teeth were prepared on two sides for a class II cavity (3 mm buccolingually x 2 mm mesiodistally at occlusal and 1.5 mm at coronal x 4 mm of axial depth) …

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Effect Of Remineralization On Color Change Of Bleached Tooth, Panita Suttisakpakdee Jan 2017

Effect Of Remineralization On Color Change Of Bleached Tooth, Panita Suttisakpakdee

Chulalongkorn University Theses and Dissertations (Chula ETD)

The aim of this in vitro study was to investigate the effect of remineralization and time on the color and microhardness change of teeth bleached using 10% carbamide peroxide (10%CP) or 40% hydrogen peroxide (40%HP). Seventy-two 6x6x2 mm3 enamel slabs were prepared from human premolars. The specimens' color and Vickers' microhardness were recorded at baseline (T0). The specimens were divided into six groups, two groups were treated with 10%CP with or without casein phosphopeptides and amorphous calcium phosphate (CPP-ACP) (10%CP and 10% CP/CPP-ACP, respectively), two groups were treated with 40% HP with or without CPP-ACP (40%HP and 40%HP/CPP-ACP, respectively), one …

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The Overall Esthetic Assessment Of Anterior Single-Tooth Implant Restoration: Modified Objective Criteria, Pongsakorn Komutpol Jan 2017

The Overall Esthetic Assessment Of Anterior Single-Tooth Implant Restoration: Modified Objective Criteria, Pongsakorn Komutpol

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objectives: The aim of this study was to observe the correlation of esthetic outcomes of single-tooth implant restoration when using Pink Esthetic Score/White Esthetic Score and the new modified assessment (Modified Objective Criteria; MOC) Materials and Methods: This crossectional retrospective study, up to 5 years, recruited 26 patients who single implant in maxillary central incisor area was placed. All the implants were recalled. Demographic data, intraoral photograph, dental model, periapical radiograph and CBCT were taken. One examiner assessed the esthetic outcomes by using PES/WES and MOC (gingiva, prosthesis and bone foundation) with 2 weeks between each evaluation. The score of …

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A Comparison Of Taper-Implant Designs And Bone Quality On The Primary Stability: An In Vitro Biomechanical Study, Ratchaya Chayangsu Jan 2017

A Comparison Of Taper-Implant Designs And Bone Quality On The Primary Stability: An In Vitro Biomechanical Study, Ratchaya Chayangsu

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objective To investigate the effect of the taper-implant design and the effect of bone quality on the primary stability in terms of insertion torque test, removal torque test and resonance frequency analysis. Methods Five taper-implant designs were test in artificial bone blocks with four qualities. Five repetitions per implant design were placed in each bone quality started from softest bone block. The implant motor was used to prepared the osteotomy sites and implant insertion according to manufacturers' recommendation. Peak insertion torque values were measured and recorded by implant motor when the platform of the implant flush to the bone level. …

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