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Articles 301 - 330 of 1270
Full-Text Articles in Dentistry
Fracture Resistance Of Non-Ferruled Endodontically Treated Teeth Restored With Different Fiber Post And Core Methods After Five Years Fatigue Loading, Puriwat Malakorn
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 …
Fracture Resistance Of Occlusal Ceramic And Composite Molar Onlay Comparing To Lithium Disilicate Molar Crown, Jatuporn Luekiatpaisarn
Fracture Resistance Of Occlusal Ceramic And Composite Molar Onlay Comparing To Lithium Disilicate Molar Crown, Jatuporn Luekiatpaisarn
Chulalongkorn University Theses and Dissertations (Chula ETD)
Purpose: This in vitro study evaluated fracture strengths and failure modes of thin occlusal onlays fabricated from direct resin composite, CAD/CAM polymer-infiltrated ceramic-network, and CAD/CAM lithium-disilicate glass ceramic under compressive loading. Materials and Methods: Forty extracted maxillary molars were prepared, including occlusal enamel and dentin removal, leaving two dentin slopes with peripheral enamel. Thirty teeth were restored with 0.6-mm-thick occlusal onlays using direct resin composite (Premise), CAD/CAM polymer-infiltrated ceramic-network (Vita Enamic), and CAD/CAM lithium-disilicate glass ceramic (IPS e.max CAD). Others were restored with IPS e.max CAD crowns. All restored teeth were loaded vertically by means of a universal testing machine. …
The Dislodgement Of The Sponge Head Of Novel Thai-Produced Sponge Brushes, Nawachat Meechumna
The Dislodgement Of The Sponge Head Of Novel Thai-Produced Sponge Brushes, Nawachat Meechumna
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objective. To perform an in vitro investigation on the dislodgement of sponge head of different manufactured sponge brushes (Sakura shape, Sunstar BUTLER, Japan, and 4 novel Thai-produced sponge brushes; combination of two shapes (round and Leelawadee) and two textures (soft and hard), King Dental Innovation Foundation; KDIF , Thailand. Methods. In order to evaluate the dislodgement of sponge head, strength test measurement was performed according to ISO 20126:2012(E). Five types of polyurethane foam were characterized using Fourier transform infrared spectroscopy (FTIR). The density of the foam was evaluated as the weight of foam in the air per unit volume of …
Development Of Graphene Oxide/Silver Nanocomposite Coating On Niti Alloy For Biomedical Applications, Dinesh Rokaya
Development Of Graphene Oxide/Silver Nanocomposite Coating On Niti Alloy For Biomedical Applications, Dinesh Rokaya
Chulalongkorn University Theses and Dissertations (Chula ETD)
The study aimed to evaluate the surface, mechanical, and biological properties of graphene oxide/silver nanocomposite (GO/Ag) coated NiTi alloy. Substrates were coated using the electrophoretic deposition at 30 V for 1, 5, and 10 min, and were characterized by scanning electron microscope, Raman spectroscopy, energy dispersive spectroscopy, surface profilometer, and atomic fluoroscope force microscopy (AFM). Hardness, modulus of elasticity, and friction were done and surface adhesion was measured from AFM. Biocompatibility testing was done on human gingival fibroblasts using 3-[4,5-dimethylthiazol-2-yl]-2, 5-diphenyltetrazolium bromide (MTT) assay. Data were analyzed using SPSS 16; One-way ANOVA with post hoc Scheffe Test (P = 0.05). …
Effects Of Blood Contamination On Chemical Composition And Ion Releasing Of Calcium Silicate-Based Materials, Nareerat Thanavibu
Effects Of Blood Contamination On Chemical Composition And Ion Releasing Of Calcium Silicate-Based Materials, Nareerat Thanavibu
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study assessed the effects of blood contamination on the chemical composition and ion release of calcium silicate-based materials. ProRoot MTA (WMTA), Biodentine and TotalFill BC RRM putty (TRRM) were investigated. Materials were exposed to blood (blood-contaminated condition) or normal saline (non-blood-contaminated condition) for 24 hours. Three samples of each group were analysed for chemical composition using X-ray diffractometer and an energy-dispersive X-ray spectoscope with a scanning electron microscope after immersed in phosphate-buffered saline for 1, 7, 14 and 28 days. Five samples of each group were used to measure pH and ion release using a pH meter and inductively …
Effectiveness Of Different Root Canal Disinfection Protocols On The Reduction Of Bacteria In Large Root Canals, Parnwad Sasanakul
Effectiveness Of Different Root Canal Disinfection Protocols On The Reduction Of Bacteria In Large Root Canals, Parnwad Sasanakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Introduction: The aims of this study were to evaluate the effectiveness of disinfection methods and determine the most promising irrigation protocol for regenerative endodontics in teeth with large root canals. Methods: Sterilized root samples with 0.8-mm wide apical foramen (n=94) were prepared from human mandibular premolars. Ninety-two samples were infected with E. faecalis for 21 days and biofilm formation was verified using scanning electron microscopy (n=2). The 90 infected samples were randomly assigned into 9 groups: no intervention (initial), 1.5% NaOCl irrigation (1.5N), 2.5% NaOCl irrigation (2.5N), 1.5N + intermittent passive ultrasonic irrigation (PUI), 1.5N + intermittent canal brushing with …
Comparison Of The Accuracy Between Digital And Conventional Impression In Different Multiple Implant Angles At Posterior Mandibular Region Using Innovation 3d Super Imposition Software Program; In Vitro Study, Arisa Hongsopa
Chulalongkorn University Theses and Dissertations (Chula ETD)
Statement of problem: This study aims to compare the accuracy of three-dimensional changes in position and angulation between digital and conventional impression techniques in different angulated implants at the mandibular partial edentulous area with the use of a mandibular partial edentulous reference model with 4 dental implants in different angulations (15 degrees buccally,lingually, mesially, and distally). Conventional and digital impression techniques were used for master model and fabricated 15 conventional master casts and 15 three dimensional printing models. Each scan body was connected with implant or analog to transfer implant positions. All of the master model, master casts, and printing …
Using Of Low Modulus Of Elasticity Base In High C-Factor Resin Composite Restoration: An In Vitro Study, Jomnang Yoohun
Using Of Low Modulus Of Elasticity Base In High C-Factor Resin Composite Restoration: An In Vitro Study, Jomnang Yoohun
Chulalongkorn University Theses and Dissertations (Chula ETD)
This in vitro study aims to investigate whether or not using a resin modified glass ionomer as a base or intermediate layer would improve marginal integrity of a high C-factor class V resin composite restoration. Eighty non-carious human third molars were used. A box-shaped, 5x3x2.5 mm3, Class V cavity preparation was placed on buccal surface at the cementoenamel junction. Teeth were then randomly assigned to 8 experimental groups (n=10): group 1, Resin composite (FiltekTM Z350 XT); group 2, FiltekTM Bulkfill; groups 3 and 4, resin composite with FiltekTM Z350 XT Flowable as base; groups 5 and 6, resin composite with …
Comparison Of Three Dimensional Accuracy For Surgical Guided Template Fabrication Using Two Different Implant Planning Software Programs, Natchaya Thitaphanich
Comparison Of Three Dimensional Accuracy For Surgical Guided Template Fabrication Using Two Different Implant Planning Software Programs, Natchaya Thitaphanich
Chulalongkorn University Theses and Dissertations (Chula ETD)
Statement of problem: Static computer-assisted implantation system (s-CAIS) has been introduced to implant dentistry for decades. According to previous studies, they were recognised the inaccuracies of actual implant position placed via using static computer-assisted implantation system. These inaccuracies result from an accumulation of every step in the workflow from planning to accuracy assessment. Recently, there are multiple implant planning softwares available. coDiagnostiXTM software and Implant StudioTM software are widely used third-party implant planning softwares which claimed to provide predictable implant placement outcome. However, the effect of softwares used on accuracy of guided surgery in anterior maxilla region has not been …
Fracture Resistance Of Endodontically Treated Premolars With Deep Cervical Lesion Restored With And Without Post In Different Restorations, Phrohphrim Suebsawadphatthana
Fracture Resistance Of Endodontically Treated Premolars With Deep Cervical Lesion Restored With And Without Post In Different Restorations, Phrohphrim Suebsawadphatthana
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objectives: The purpose of this study was to evaluate the effects of fiber posts and different restorations on the fracture resistance of endodontically treated maxillary premolars with cervical cavities. Methods: In forty extracted human first maxillary premolars, cervical cavities were prepared simulating cervical lesions and randomly divided into four groups (n=10): COM-NP, endodontically treated teeth (ETT) restored with resin composite without fiber posts; ON-NP, ETT restored with CAD/CAM ceramic onlays without fiber posts; COM-P, ETT restored with resin composite and fiber posts; and CR-P, ETT restored with CAD/CAM ceramic crowns and fiber posts. After the fiber posts and restorations had …
Comparison Of Microtensile Bond Strength Of Universal Adhesives Utilizing Various Application Methods: An In Vitro Study, Suthatta Jeansuwannagorn
Comparison Of Microtensile Bond Strength Of Universal Adhesives Utilizing Various Application Methods: An In Vitro Study, Suthatta Jeansuwannagorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
Purpose: To investigate microtensile bond strength (μTBS) of a conventional three-step etch and rinse, and universal adhesive systems with etch and rinse mode utilizing various application methods at 24 hour and after 6 month water-storage. Material and methods: Seventy-two extracted human third molars were cut to expose a flat dentin surface. Optibond FL (OFL; Kerr, USA), Single Bond Universal (SU; 3M ESPE, USA), Clearfil Universal Bond Quick (CU; Kuraray Noritake Dental Inc., Japan), G-Premio BOND (GP; GC Corporation, Japan), Prime&Bond Universal (PB; Dentsply, Germany) were used in etch and rinse mode following the manufacturers' instruction and double application method. Subsequently, …
Relationship Between Maxillary Anterior Alveolar Arch Form And Tooth Root Axis In Class I Occlusion: A Cone Beam Computed Tomography Study, Suweera Petaibunlue
Relationship Between Maxillary Anterior Alveolar Arch Form And Tooth Root Axis In Class I Occlusion: A Cone Beam Computed Tomography Study, Suweera Petaibunlue
Chulalongkorn University Theses and Dissertations (Chula ETD)
Purpose: This study determined the relationships of the angulation between tooth root axis and alveolar bone axis to the anterior alveolar (AA) arch forms and the sagittal root position (SRP) classification in anterior esthetic region using cone-beam computed tomography (CBCT) images.
Materials and Methods: CBCT images which met the inclusion and exclusion criteria were classified according to a novel classification of AA arch forms (Bulyalert 2018) and a SRP classification (Kan 2011). Then, the angulations of the root axis and the alveolar bone axis were measured using the mid-sagittal CBCT images of each tooth. The relationship of the angulations in …
Assessment Of Attitudes And Knowledge Of General Dental Practitioners In Providing Implant Maintenance, Aimwalee Rudeejaraswan
Assessment Of Attitudes And Knowledge Of General Dental Practitioners In Providing Implant Maintenance, Aimwalee Rudeejaraswan
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study aimed to survey the attitudes and knowledge of Thai general dental practitioners (GDPs) in proving dental implant maintenance care. The online questionnaire was sent to Thai GDPs who graduated between 2000 and 2016. Of the returned 435 questionnaires, 429 completely filled were included for analysis. 76% of the participants were female and 24% were male. Half of the participants were aged 28-33 years old and 78% of the participants have been working as a GDP 10 years or below. There were 64.3% and 59.4% of the participants who agreed that dental implant surgery and restoration should only be …
Comparison Of The Implant Deviation Between Implants Placed Using Static And Dynamic Computer Assisted Surgery Methods, Dechawat Kaewsiri
Comparison Of The Implant Deviation Between Implants Placed Using Static And Dynamic Computer Assisted Surgery Methods, Dechawat Kaewsiri
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objectives: The aim of this study was to compare the accuracy of implant placement in terms of deviations related to the virtual plan between static and dynamic computer assisted implant surgery (CAIS) systems in single tooth space. Materials & Methods: 60 single implants were randomly placed using two difference CAIS systems by one surgeon. Preoperative CBCT transferred to implant planning software were used to plan the virtual implant position. Implants were placed using either stereolithographic guide template for static CAIS group (n = 30) or implant navigation system for dynamic CAIS group (n = 30). Postoperative CBCT were taken to …
Perceptions, Expectations, And Satisfaction Of Patients Undergoing Dental Implant Therapy In The Faculty Of Dentistry, Chulalongkorn University, Khunsiri Sermsiripoca
Perceptions, Expectations, And Satisfaction Of Patients Undergoing Dental Implant Therapy In The Faculty Of Dentistry, Chulalongkorn University, Khunsiri Sermsiripoca
Chulalongkorn University Theses and Dissertations (Chula ETD)
The aims of this study were to evaluate patient's perception before and after receiving dental implant therapy and to investigate patient's perception, expectation, and satisfaction of dental implant treated by postgraduate dental students and faculty members. This study was designed with a quantitative cross-sectional technique. The data were collected by 3 questionnaires, from patients who intended to receive dental implant treatment during September 2017 to February 2019. Two hundred and fifty participants participated in this study. Most of them were female, aged 55-64 years, graduated bachelor's degree, and facial and teeth appearance did not affect their career. The proportion of …
Comparative Study Of The Accuracy Of Single Tooth Implants Placed Between Static And Mental Computer Assisted Surgery, Palita Smitkarn
Comparative Study Of The Accuracy Of Single Tooth Implants Placed Between Static And Mental Computer Assisted Surgery, Palita Smitkarn
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objective: This randomized controlled clinical trial aimed to compared the accuracy of implant position between static and mental Computer Assisted Implant Surgery (CAIS) in single tooth gap. Materials and methods: 52 patients who received 60 implants in single tooth gap, randomized equally into static or mental CAIS. In static CAIS group, data from CBCT scan and data from intraoral or model scan were utilised for the three dimensional virtual planning implant positioning and desiring of a three dimensional surgical guide in implant planning software. Implant bed preparation and implant insertion were done through the three dimensional surgical guide. Implants in …
Comparison Of Single-Dose And Multi-Dose Antibiotic Prophylaxis In Orthognathic Surgery: A Retrospective Cohort Study, Teeraphat Pochana
Comparison Of Single-Dose And Multi-Dose Antibiotic Prophylaxis In Orthognathic Surgery: A Retrospective Cohort Study, Teeraphat Pochana
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objective: (1) to compare the prophylactic effect of a single versus a multiple dose antibiotic regimens and (2) to determine factors related to surgical site infection in orthognathic surgery. Materials and methods: Medical records of patients underwent orthognathic surgery in the Faculty of Dentistry, Chulalongkorn University between 2014 and 2016 were extracted for medical data including demographic data, American Society of Anesthesiologists (ASA)-classified past medical history, orthognathic surgical procedures and complications, prophylactic antibiotic regimen, and surgical site infection. The records also contained 30-day follow-up information, according to the Centers for Disease Control and Prevention (CDC) diagnostic criteria for surgical site …
Comparative Study Between Vitamin B 1-6-12 And Vitamin B 12 For Neurosensory Recovery After Bilateral Sagittal Split Ramus Osteotomy, Worawee Trising
Comparative Study Between Vitamin B 1-6-12 And Vitamin B 12 For Neurosensory Recovery After Bilateral Sagittal Split Ramus Osteotomy, Worawee Trising
Chulalongkorn University Theses and Dissertations (Chula ETD)
A major complication from Bilateral Sagittal Split Ramus Osteotomy (BSSRO) is inferior alveolar nerve injured that manifest as neurosensory disturbance (NSD) on the lower lip, chin. Although the NSD is not a life-threatening problem but it impacts the patient's daily life. Vitamin B is commonly used to treat peripheral neuropathy but it is only few study for NSD from BSSRO. The aim of this study was to evaluate the effect of oral vitamin B1-6-12 and vitamin B12 on NSD after BSSRO. The study design was as a randomized, single blinded control trial of 75 patients who were NSD from BSSRO …
Pd-1 Expression On Immune Cells In Sepsis Mouse Model And The Susceptibility To Secondary Fungal Infection, Chau Tran Bao Vu
Pd-1 Expression On Immune Cells In Sepsis Mouse Model And The Susceptibility To Secondary Fungal Infection, Chau Tran Bao Vu
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objectives: This study aimed to i) determine the kinetic changes of immune cell phenotypes, including an exhaustion marker PD-1, in spleens of murine sepsis ii) investigate the susceptibility against secondary fungal infection after sepsis, and iii) investigate the efficacy of an anti-PD-1 treatment in post-sepsis fungal infection. Methods: Cecal ligation and puncture (CLP) was used as a sepsis model and splenocytes post-CLP were assessed by flow cytometry. In addition, secondary post sepsis systemic fungal infections by Candida albicans or Aspergillus fumigatus administration at 5-day post-CLP were performed. Moreover, secondary aspergillosis was treated with Amphotericin B with or without anti-PD-1 to …
Tlr3 Signaling Modulates Immunomodulatory Property Of Human Periodontal Ligament Stem Cells., Daneeya Chaikiawkeaw
Tlr3 Signaling Modulates Immunomodulatory Property Of Human Periodontal Ligament Stem Cells., Daneeya Chaikiawkeaw
Chulalongkorn University Theses and Dissertations (Chula ETD)
Toll like receptor 3 (TLR3) is a member of TLR family functions to recognizes double-stranded RNA (dsRNA) produced by positive-strand RNA viruses and DNA virusesand generate signaling that stimulate body immune system against virus infection. However, recent evidence suggests that TLR3 signaling may also play a role in initiating the immunosuppressive property of the cells. Study on skin regeneration has shown the anti-inflammatory responses of keratinocytes required for wound healing andthe increasing number of hair follicle formation after TLR3 signaling was activated by fragment of RNA released from damaged cells. Moreover, activation of TLR3 signaling have shown to elicit a …
Effect Of Cyclic Tensile Force On The Expression Of Bone Morphogenetic Protein 9 And Interleukin 6 In Human Periodontal Ligament Cells, Yanee Tantilertanant
Effect Of Cyclic Tensile Force On The Expression Of Bone Morphogenetic Protein 9 And Interleukin 6 In Human Periodontal Ligament Cells, Yanee Tantilertanant
Chulalongkorn University Theses and Dissertations (Chula ETD)
Periodontium is a specialized tissue laying between tooth and surrounding bone. It functions as force cushion. In particular stimulation including mechanical force, periodontal ligament (PDL) cells which are mechanosensitive cells have the ability to secrete specific cytokines and proteins. PDL cells also have the potential to differentiate into osteoblast-like cells or fibroblast-like cells. PDL cells perceive combination of force in oral cavity in which major component is cyclic tensile force (CTF). CTF play an essential role in modulating PDL cells to maintain both hard and soft tissue integrity. Here, we demonstrated that CTF was able to stimulate the expression of …
The Effect Of Disking Technique On Proximal Caries Of Primary Upper Incisors In Tribal Preschool Children Attending Child Development Centers Of Mae Fah Luang District, And Doi Tung Development Project, Chiang Rai, Niwat Thanaboonyang
Chulalongkorn University Theses and Dissertations (Chula ETD)
Aim: To evaluate the effect of disking technique and resin modified glass ionomer cement (RMGI) restoration on proximal caries of primary upper incisors in tribal preschool children, aged 3-5 years, attending child development centers of Doi Tung Development Project, Chiang Rai. Methods: Twenty tribal preschool children were enrolled in this match-paired design study. Twenty-six proximal carious surfaces were randomized for RMGI restoration (control group), and 26 proximal carious surfaces were randomized for disking technique (experimental group). Fluoride varnish was applied in both groups after treatment. At 6-month interval, the treatment success was evaluated including retention of restoration, marginal integrity, no …
Association Between Chronic Periodontitis And Hypertension Among Thai Adults, Ploysiri Rassamee
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 …
Effect Of Methyl Formate-Methyl Acetate Treatment On Flexural Strength Between Denture Base And Self-Cured Hard Reline Materials, Mongkol Puangpetch
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), …
Effect Of Citric Acid On Color Stability And Surface Roughness Of Translucent Monolithic Zirconia With Different Staining Techniques, Panisa Rinthong
Effect Of Citric Acid On Color Stability And Surface Roughness Of Translucent Monolithic Zirconia With Different Staining Techniques, Panisa Rinthong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Background and rationale: Translucent monolithic zirconia is developed to solve the problem of esthetic in the conventional generation of zirconia with high opacity. When these materials are used for anterior restoration in the oral cavity, they can contact with foods and beverages that are acidic, which may affect the color stability and surface roughness of the material at different levels. Objective: The objective of this study was to determine the effects of citric acid on color stability and surface roughness of translucent monolithic zirconia with different staining techniques. Materials and Methods: A total of 80 disc specimens of VITA YZ® …
Comparison Of The Efficacy Of Chemical Cleaning Methods In Removing Candida Albicans From Polymethyl Methacrylate, Thanaporn Thanamee
Comparison Of The Efficacy Of Chemical Cleaning Methods In Removing Candida Albicans From Polymethyl Methacrylate, Thanaporn Thanamee
Chulalongkorn University Theses and Dissertations (Chula ETD)
The proper denture hygiene is important to reduce the risk of denture stomatitis. Mechanical cleaning is not sufficient to remove the dental plaque from acrylic denture base, accordingly chemical cleaning is needed. The purpose of this study was to compare the efficacy of chemical cleaning methods in removing Candida albicans from polymethyl methacrylate (PMMA) by comparing the remaining viable cells after cleaning. The total of 120 specimens were prepared. Candida albicans was cultured in broth to log phase. All specimens were randomly placed in 24-well tissue culture plate with 1 ml of Candida albicans cultured for biofilm formation at 37 …
Effect Of Various Curing Conditions In Pressure Cooker On Flexural Strength Of Denture Hard Relining Materials, Thassanee Suwannachote
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 …
ผลของกาวติดฟันเทียมต่อประสิทธิภาพการบดเคี้ยวและแรงบดเคี้ยวสูงสุดในผู้ป่วยที่ใส่ฟันเทียมทั้งปาก, หยาดฝน พลศรี
ผลของกาวติดฟันเทียมต่อประสิทธิภาพการบดเคี้ยวและแรงบดเคี้ยวสูงสุดในผู้ป่วยที่ใส่ฟันเทียมทั้งปาก, หยาดฝน พลศรี
Chulalongkorn University Theses and Dissertations (Chula ETD)
วัตถุประสงค์เพื่อศึกษาผลของกาวติดฟันเทียมต่อประสิทธิภาพการบดเคี้ยว (masticatory performance) และแรงบดเคี้ยวสูงสุด (maximum occlusal force) ของผู้ป่วยฟันเทียมทั้งปาก ผู้ป่วยสันเหงือกว่างที่ใส่ฟันเทียมทั้งปากบนและล่างจำนวน 65 คน อายุเฉลี่ย 68.9±7.2 ปี เป็นเพศชาย 39 คน เพศหญิง 26 คน มีคุณภาพฟันเทียมอยู่ในระดับที่ยอมรับได้ (กลุ่ม A) และยอมรับไม่ได้ (กลุ่ม UA) จำนวน 44 และ 21 คน ตามลำดับ มีลักษณะของเนื้อเยื่อรองรับฟันเทียมตามระบบของ American College of Prosthodontists กลุ่ม I, II, III และ IV จำนวน 19 30 11 และ 5 คนตามลำดับ ผู้ป่วยเข้ารับการทดสอบประสิทธิภาพการบดเคี้ยวด้วยการเคี้ยวถั่วลิสงจำนวน 20 รอบวงเคี้ยว ถั่วลิสงที่ผ่านการเคี้ยวแล้วจะถูกร่อนผ่านเครื่องสั่น ด้วยตะแกรงทดสอบมาตรฐานจำนวน 12 ชั้น เพื่อวิเคราะห์หาขนาดอนุภาคกลางของถั่วลิสง (median particle size) และเข้ารับการทดสอบแรงบดเคี้ยวสูงสุดด้วยการกัดแผ่นฟิล์มที่อ่อนไหวต่อความดัน (pressure sensitive film) โดยวางแผ่นฟิล์มระหว่างด้านบดเคี้ยวของฟันเทียมบนและล่างในตำแหน่งสบสนิทที่สุด (maximum intercuspal position) วิเคราะห์และแปรผลด้วยโปรแกรมสถิติสำเร็จรูป เพื่อเปรียบเทียบประสิทธิภาพการบดเคี้ยวและแรงบดเคี้ยวสูงสุดระหว่างก่อน (T1) และหลังการใช้กาวติดฟันเทียมอย่างต่อเนื่องเป็นระยะเวลา 1 เดือน (T2) สถิติที่ใช้ในการทดสอบคือ paired t-test ที่ระดับความเชื่อมั่นร้อยละ 95 ผลการศึกษาพบว่าเมื่อเปรียบเทียบก่อนและหลังการใช้กาวติดฟันเทียม ประสิทธิภาพการบดเคี้ยวเพิ่มขึ้นอย่างมีนัยสำคัญในกลุ่ม A (P = 0.035) แต่ไม่มีความแตกต่างอย่างมีนัยสำคัญทางสถิตในกลุ่ม UA (P = 0.313) แรงบดเคี้ยวสูงสุดลดลงอย่างมีนัยสำคัญในกลุ่ม A (P = 0.020) แต่ไม่มีความแตกต่างอย่างมีนัยสำคัญทางสถิติในกลุ่ม UA (P …
ประสิทธิภาพของซิลเวอร์ไดเอมีนฟลูออไรด์ในการคืนแร่ธาตุในรอยผุชั้นเนื้อฟัน: การวิจัยเชิงทดลองในห้องปฏิบัติการ, กันตพร คุณพนิชกิจ
ประสิทธิภาพของซิลเวอร์ไดเอมีนฟลูออไรด์ในการคืนแร่ธาตุในรอยผุชั้นเนื้อฟัน: การวิจัยเชิงทดลองในห้องปฏิบัติการ, กันตพร คุณพนิชกิจ
Chulalongkorn University Theses and Dissertations (Chula ETD)
การศึกษานี้มีวัตถุประสงค์เพื่อเปรียบเทียบประสิทธิภาพของซิลเวอร์ไดเอมีนฟลูออไรด์ที่มีจำหน่ายในท้องตลาด ในการคืนแร่ธาตุในรอยผุชั้นเนื้อฟันของฟันน้ำนม การศึกษานี้เป็นการศึกษาในห้องปฏิบัติการโดยใช้ชิ้นฟันตัวอย่างจากฟันกรามน้ำนมที่มีรอยผุตามธรรมชาติชั้นเนื้อฟันจำนวน 36 ชิ้น วัดความหนาแน่นแร่ธาตุของรอยผุเริ่มต้นด้วยเครื่องถ่ายภาพรังสีคอมพิวเตอร์ระดับไมโครเมตรแล้วนำมาคำนวณความลึกรอยผุและความหนาแน่นแร่ธาตุเฉลี่ย แบ่งชิ้นฟันเป็น 3 กลุ่ม กลุ่มที่ 1 ทา Saforide® (Toyo Seiyaku Kesei, Japan) กลุ่มที่ 2 ทา Advantage ArrestTM (Elevate Oral Care, USA) และกลุ่มที่ 3 ทาน้ำปราศจากไอออน (กลุ่มควบคุม) นำไปผ่านกระบวนการสลับกรด-ด่างโดยใช้เชื้อแบคทีเรียเพื่อจำลองสภาวะในช่องปากเป็นเวลา 5 วัน จากนั้นนำมาวัดความหนาแน่นแร่ธาตุหลังการทดลองด้วยเครื่องถ่ายภาพรังสีคอมพิวเตอร์ระดับไมโครเมตร คำนวณความลึกรอยผุ ความหนาแน่นแร่ธาตุเฉลี่ยและร้อยละการเปลี่ยนแปลงความหนาแน่นแร่ธาตุหลังการทดลอง ผลการทดลองพบว่าชิ้นฟันตัวอย่างกลุ่มที่ทา Saforide® และ Advantage ArrestTM มีความลึกรอยผุหลังการทดลองลดลงอย่างมีนัยสำคัญทางสถิติ (p= 0.033 และ 0.021 ตามลำดับ) และมีความหนาแน่นแร่ธาตุเฉลี่ยหลังการทดลองเพิ่มขึ้นอย่างมีนัยสำคัญทางสถิติ (p= 0.002 และ 0.002 ตามลำดับ) พบว่าร้อยละการเปลี่ยนแปลงความหนาแน่นแร่ธาตุระหว่างกลุ่มทดลองทั้งสองกลุ่มไม่แตกต่างกันแต่แตกต่างจากกลุ่มควบคุมอย่างมีนัยสำคัญทางสถิติ (p< 0.001) สรุปได้ว่า Saforide® และ Advantage ArrestTM มีประสิทธิภาพในการคืนแร่ธาตุในรอยผุชั้นเนื้อฟันของฟันน้ำนมใกล้เคียงกัน
การวิเคราะห์การเรืองแสงเชิงปริมาณด้วยการใช้แสงกระตุ้นในบริเวณชิดแถบรัดฟันซึ่งยึดด้วยซีเมนต์, ชวลิต เพียรมี
การวิเคราะห์การเรืองแสงเชิงปริมาณด้วยการใช้แสงกระตุ้นในบริเวณชิดแถบรัดฟันซึ่งยึดด้วยซีเมนต์, ชวลิต เพียรมี
Chulalongkorn University Theses and Dissertations (Chula ETD)
การศึกษานี้มีวัตถุประสงค์เพื่อเปรียบเทียบผลของซีเมนต์ชนิดซิงค์ฟอสเฟตซีเมนต์ (ZC) ซิงค์โพลีคาร์บอกซิเลตซีเมนต์ (ZPC) กลาสไอโอโนเมอร์ซีเมนต์ชนิดดั้งเดิม (GI) เรซินมอดิฟายด์กลาสไอโอโนเมอร์ซีเมนต์ชนิดผงและน้ำ (RMGI-P/L) เรซินมอดิฟายด์กลาสไอโอโนเมอร์ซีเมนต์ชนิดสองหลอด (RMGI-P/P) และโพลีแอซิดมอดิฟายด์คอมโพสิตเรซิน (PMCR) ต่อการยับยั้งการสูญเสียแร่ธาตุที่ผิวเคลือบฟันบริเวณขอบของแถบรัดฟัน เป็นการศึกษาในห้องปฏิบัติการโดยใช้ฟันกรามน้อยแท้ของมนุษย์จำนวน 70 ซี่ ทำการขัดผิวเคลือบฟัน และสร้างช่องหน้าต่างทดลองบริเวณกึ่งกลางของด้านไกลกลางขนาด 1 x 2 ตารางมิลลิเมตร แบ่งฟันเป็น 7 กลุ่ม เพื่อยึดด้วย; (1) ZC (Zinc Cement Improved®), (2) ZPC (Hy-Bond Polycarboxylate Cement®), (3) GI (Hy-Bond Glasionomer CX®), (4) RMGI-P/L (GC Fuji Ortho LC®), (5) RMGI-P/P (GC Fuji Ortho Band Paste Pak®), (6) PMCR (Ultra Band-Lok®) และ (7) กลุ่มควบคุมที่ไม่ได้ยึดแถบรัดฟัน (Control) จากนั้นจำลองภาวะอุณหภูมิร้อนเย็นในช่องปาก 24 ชั่วโมง และภาวะการสูญเสียและคืนกลับแร่ธาตุ 21 วัน ทำการรื้อแถบรัดฟันและกำจัดซีเมนต์ก่อนนำชิ้นงานทั้งหมดวัดค่าร้อยละการสูญเสียฟลูออเรสเซนส์บริเวณช่องหน้าต่างทดลอง (∆F), ค่าร้อยละการสูญเสียฟลูออเรสเซนส์สูงสุดบริเวณช่องหน้าต่างทดลอง (∆Fmax) ค่าพื้นที่ที่เกิดการสูญเสียฟลูออเรสเซนส์ (Area) และปริมาตรของเคลือบฟันที่สูญเสียแร่ธาตุ (∆Q) ด้วยเทคนิควิเคราะห์การเรืองแสงเชิงปริมาณด้วยการใช้แสงกระตุ้นชนิดดิจิตอล จากการวิเคราะห์ด้วยสถิติ Kruskal-Wallis test พบความแตกต่างของค่าเฉลี่ย ∆F, ∆Fmax, Area และ ∆Q ของซีเมนต์แต่ละกลุ่มอย่างมีนัยสำคัญทางสถิติ (P<0.001) เมื่อหาความแตกต่างทางสถิติในแต่ละคู่โดยใช้สถิติ Pairwise comparisons ไม่พบความแตกต่างกันอย่างมีนัยสำคัญทางสถิติของค่าเฉลี่ย ∆F, ∆Fmax, Area และ ∆Q เมื่อจับคู่เปรียบเทียบระหว่างกลุ่ม Control:PMCR, ZP:ZPC, ZP:GI, ZP:RMGI-P/L, ZP:RMGI-P/P, ZPC:GI, ZPC:RMGI-P/L, ZPC:RMGI-P/P, GI:RMGI-P/L, GI:RMGI-P/P, RMGI-P/L:RMGI-P/P และ RMGI-P/L:PMCR แต่พบความแตกต่างอย่างมีนัยสำคัญทางสถิติเมื่อจับคู่เปรียบเทียบระหว่างกลุ่ม Control:ZP, Control:ZPC, Control:GI, Control:RMGI-P/L และ Control: RMGI-P/P, PMCR:ZC, PMCR:ZPC, PMCR:GI และ PMCR:RMGI-P/P การศึกษาในครั้งนี้พบว่าฟันซึ่งยึดแถบรัดฟันด้วย ZC, ZPC, GI และ RMGI-P/P ไม่เกิดการสูญเสียแร่ธาตุที่ผิวเคลือบฟันบริเวณขอบของแถบรัดฟัน ส่วนกลุ่ม RMGI-P/L, PMCR และกลุ่มควบคุมเกิดการสูญเสียแร่ธาตุที่ผิวเคลือบฟัน โดยที่กลุ่ม RMGI-P/L เกิดการสูญเสียแร่ธาตุน้อยกว่ากลุ่มควบคุม แต่กลุ่ม PMCR เกิดการสูญเสียแร่ธาตุไม่แตกต่างจากกลุ่มควบคุม