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Full-Text Articles in Medicine and Health Sciences
Performance Of Melamine Modified Urea-Formaldehyde Microcapsules In A Dental Host Material, Noor Hayaty Abu Kasim Abu Kasim N.H.
Performance Of Melamine Modified Urea-Formaldehyde Microcapsules In A Dental Host Material, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Urea-formaldehyde (UF) microcapsules filled with dicyclopentadiene (DCPD) show potential for making self-healing dental restorative materials. To enhance the physical properties of the capsules, the urea was partially replaced with 0-5% melamine. The microcapsules were analyzed by different microscopic techniques. DSC was used to examine the capsule shell, and the core content was confirmed by (1)H NMR spectroscopy. Capsules in the range of 50-300 mu m were then embedded in a dental composite matrix consisting of bisphenol-A-glycidyl dimethacrylate (Bis-GMA) and triethylene-glycol dimethacrylate (TEGDMA). Flexural strength, microhardness, and nanoindentation hardness measurements were performed on the light-cured specimens. Optical microscopy (OM) examination showed …
Human Platelet Lysate Permits Scale-Up Of Dental Pulp Stromal Cells For Clinical Applications, Noor Hayaty Abu Kasim Abu Kasim N.H.
Human Platelet Lysate Permits Scale-Up Of Dental Pulp Stromal Cells For Clinical Applications, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Background aims. Dental pulp stromal cells (DPSC) are considered to be a promising source of stem cells in the field of regenerative therapy. However, the usage of DPSC in transplantation requires large-scale expansion to cater for the need for clinical quantity without compromising current good manufacturing practice (cGMP). Existing protocols for cell culturing make use of fetal bovine serum (FBS) as a nutritional supplement. Unfortunately, FBS is an undesirable additive to cells because it carries the risk of transmitting viral and prion diseases. Therefore, the present study was undertaken to examine the efficacy of human platelet lysate (HPL) as a …
Porosity Reduction Model In Titanium - Hydroxyapatite Fgm Composites Using Shrinkage Measurement, Noor Hayaty Abu Kasim Abu Kasim N.H.
Porosity Reduction Model In Titanium - Hydroxyapatite Fgm Composites Using Shrinkage Measurement, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
A multilayered titanium (Ti)‐hydroxyapatite (HA) functionally graded material was produced via pressureless sintering at 1100°C. The initial and final porosities were determined via shrinkage measurements. The final porosity verification was carried out by the Archimedes method. The experimental porosity measurements were compared with two proposed models. The macroscopic and microstructure features and the measured porosities confirmed that the volume fraction porosity was associated with both matrix and reinforcing particles in all cases. The percolation threshold was observed at x = 0·75 in the xTi+(1−x)HA mixture.
Differentiation Of Dental Pulp Stem Cells Into Islet-Like Aggregates, Noor Hayaty Abu Kasim Abu Kasim N.H.
Differentiation Of Dental Pulp Stem Cells Into Islet-Like Aggregates, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
The post-natal dental pulp tissue contains a population of multipotent mesenchymal progenitor cells known as dental pulp stromal/stem cells (DPSCs), with high proliferative potential for self-renewal. In this investigation, we explored the potential of DPSCs to differentiate into pancreatic cell lineage resembling islet-like cell aggregates (ICAs). We isolated, propagated, and characterized DPSCs and demonstrated that these could be differentiated into adipogenic, chondrogenic, and osteogenic lineage upon exposure to an appropriate cocktail of differentiating agents. Using a three-step protocol reported previously by our group, we succeeded in obtaining ICAs from DPSCs. The identity of ICAs was confirmed as islets by dithiozone-positive …
Structural And Compositional Characterization Of Silverfil Amalgam, Noor Hayaty Abu Kasim Abu Kasim N.H.
Structural And Compositional Characterization Of Silverfil Amalgam, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
SilverFil (Silverfildental Products, Malaysia) is another commercially available dental amalgam; however it is based on silver and mercury only. It is claimed that upon amalgamation, there is no excess mercury in SilverFil. Objectives: The objectives of this study were to determine the structural state and chemical composition of the starting materials and presence of mercury in the resulting amalgam. Methods: All the starting materials of SilverFil and the SilverFil amalgam specimens were characterize using Field Emission Scanning Electron Microscopy (FESEM-EDX), X-Ray Diffraction (XRD) and X-Ray Photoelectron Spectroscopy (XPS). Results: The FESEM images of the amalgam shows silver-mercury (Ag-Hg) clusters. The …
Optimization Of Microencapsulation Process For Self-Healing Polymeric Material, Noor Hayaty Abu Kasim Abu Kasim N.H.
Optimization Of Microencapsulation Process For Self-Healing Polymeric Material, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
A series of poly(urea-formaldehyde) (PUF) microcapsules filled with dicyclopentadiene (DCPD) was successfully prepared by in situ polymerization. The effect of diverse process parameters and ingredients on the morphology of the microcapsules was observed by SEM, optical microscopy (OM) and digital microscopy. Different techniques for the characterization of the chemical structure and the core content were considered such as FT-IR and (1)H-NMR as well as the characterization of thermal properties by DSC. High yields of free flowing powder of spherical microcapsules were produced. The synthesized microcapsules can be incorporated into another polymeric host material. In the event the host material cracks …
Thermo-Mechanical Stress In Multilayered Dental Post Due To Temperature Gradient, Noor Hayaty Abu Kasim Abu Kasim N.H.
Thermo-Mechanical Stress In Multilayered Dental Post Due To Temperature Gradient, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Objective: To analyse thermo-mechanical stress in endodontically treated teeth restored with Multilayered Structured Dental Posts (MSDPs) under cold and hot conditions using Finite Element Analysis (FEM). Methods: Three MSDPs of multilayer design of xTi-yHA composition added to a zirconia layer (model A), an alumina layer (model B) and a titanium layer (model C) were compared with zirconia (model D) and titanium (model E) posts. The fractions of Ti and HA was varied gradually. Changes in temperature of an endodontically restored tooth model were calculated as a result of hot and cold response. The resulting thermo-mechanical stresses were analysed and compared …
Alcohol Use And Psychosocial Correlates Among Aborigines In Central Penisular Malaysia, R. Abd Rashid, W.A. Irnee, M.M.A. Zahari, A.S.A. Nordin, Noorzurani Robson Associate Prof. Dr., A.H. Sulaiman, R.A. Kadir, D. A. A. Rahim, H. Peters, M. A. Said, H. Habil
Alcohol Use And Psychosocial Correlates Among Aborigines In Central Penisular Malaysia, R. Abd Rashid, W.A. Irnee, M.M.A. Zahari, A.S.A. Nordin, Noorzurani Robson Associate Prof. Dr., A.H. Sulaiman, R.A. Kadir, D. A. A. Rahim, H. Peters, M. A. Said, H. Habil
Associate Prof. Dr. Noorzurani Robson
To determine the prevalence of alcohol abuse/dependence, psychiatric morbidity and psychosocial correlates among Malaysian aborigines.
Cytotoxicity Of Polyurethane Dimethacrylate Derived From Palm Oil Polyol., Noor Hayaty Abu Kasim Abu Kasim N.H.
Cytotoxicity Of Polyurethane Dimethacrylate Derived From Palm Oil Polyol., Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Objective: The aim of this study was to investigate the cytotoxicity effect of polyurethane dimethacrylate monomer derived from palm oil polyol (PUDMA) and 2 experimental composite resins based on these monomer PUDMA- based composites) compared to an experimental Bis-GMA/TEGDMA-based composite and EsthetX flowable composite (Dentsply, Caulk, USA). Methods: The experimental composite resins were prepared by mixing 0.25% and 0.75% by weight camphorquinone and ethyl (4-dimethyl amino) benzoate with 60% filler for each of the following monomer systems; I) PUDMA monomer (PUDMA-based composite resin), II) Bis-GMA/TEGDMA at ratio of 75:25 by weight, III) PUDMA/BisGMA-TEGDMA at ratio of 50:50 by weight. Eight …
Surface Reproduction Of Elastomeric Materials: Viscosity And Groove Shape Effects, Noor Hayaty Abu Kasim Abu Kasim N.H.
Surface Reproduction Of Elastomeric Materials: Viscosity And Groove Shape Effects, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Objective: To evaluate the effect of viscosity and type of grooves on surface detail reproduction of elastomeric impression materials. Methods: Express putty/light-, Impregum medium- and heavy/light-bodied and Aquasil medium- and putty/light-bodied elastomeric impression materials were chosen for this study. Five impressions were made using a cylindrical aluminum reference block with U- and V- shaped grooves and to produce 35 master dies. Each master die was immersed in distilled water at 370 C for 5 minutes prior to the impression making on moist surfaces. Surface topography of the dies and impressions were captured using Alicona Imaging System. The mean difference in …
A Finite Element Study Of The Multilayered Structured Dental Post, Noor Hayaty Abu Kasim Abu Kasim N.H.
A Finite Element Study Of The Multilayered Structured Dental Post, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Ideally, dental post should have stiffness that is similar to the crown at the coronal part and stiffness similar to the dentine at the apical part. This will reduce stress concentration at either coronal or the apical parts of the dentine and minimize the chance of interfacial loosening and enhance the reliability of post. Objective: To investigate the biomechanical behaviour of Multilayered Structured Dental Posts (MSDPs) using finite element analysis (FEA). Methods: Two models of MSDPs consist of multilayer design of xTi-yHA composition added to a zirconia layer (model A) and the same compositions added to alumina layer (model B) …
The Current Status Of The Case Report: Terminal Or Viable, Noor Hayaty Abu Kasim Abu Kasim N.H.
The Current Status Of The Case Report: Terminal Or Viable, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
The case report, which has a long history in medicine, has seen its fortune wax and wane with time. We discuss the challenges facing the continued survival of the case report, including the inability of journals to cope with the increased load and increased cost of publication, ethical issues, the impact factor and the rise of evidence-based medicine. We highlight the important role that the case report will continue to play in medical research and education, as a means of sharing information and detecting novelty through observations. Most importantly, the case report serves as a stepping stone for young physicians …
Modification Of Pmma Dental Resin With Palm Oil Based Polyol, Noor Hayaty Abu Kasim Abu Kasim N.H.
Modification Of Pmma Dental Resin With Palm Oil Based Polyol, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Objectives: This study is an attempt to enhance the properties of conventional PMMA denture material by incorporation of a polyfunctional polyol derived from palm oil by copolymerization with methyl methacrylate monomer to overcome the low fatigue resistance property of PMMA. Methods: A series of copolymerizations of palm oil polyol with MMA was performed in solution. The polyol was added from 40-20 %, MMA from 20-40% , benzoyl peroxide as initiator was at 0.04% and toluene used as solvent was at 60 % of the total weight. The copolymerization was carried out in a 500ml-round-bottom reaction flask, equipped with a magnetic …
Conversion Of A New Monomer For Dental Resin Application, Noor Hayaty Abu Kasim Abu Kasim N.H.
Conversion Of A New Monomer For Dental Resin Application, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Objective: The aim of this study was to investigate the degree of conversion and cross-linking of polyurethane dimethacrylate (PUDMA), derived from palm oil polyol, for dental resin application. Methods: Polyurethane dimethacrylate was synthesized by reacting excess amount of Methylene diphenyl diisocyanate (MDI) with palm oil polyol. The resulting isocyanate polyurethane prepolymer was then acrylated using hydroxymethacrylate (HEMA). Fourier transform infrared spectroscopy was used to ascertain the formation of PUDMA, and to determine the degree of conversion (DC) of: I) PUDMA, II) Bis-GMA, III)Bis-EMA,IV) Bis-GMA/TEGDMA (3:1), V) Bis-GMA/TEGDMA(3:1)/Bis-EMA (3:1), VI) PUDMA/Bis-EMA (3:1), VII) Bis-GMA/TEGDMA(3:1)/PUDMA (1:1), and VIII) Bis-GMA/TEGDMA(3:1)/PUDMA/Bis-EMA (1-1-1). The photo …
Flexural Strength Of Pmma Modified With Palm-Oil Based Polyol, Noor Hayaty Abu Kasim Abu Kasim N.H.
Flexural Strength Of Pmma Modified With Palm-Oil Based Polyol, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Objectives:Biocompatibility is an important desirable property for a dental polymer and it can be achieved by utilizing more materials from natural sources. The flexural strength of an experimental polymer prepared from MMA monomer modified with palm-oil polyol was compared to two commercial resins,namely the Lucitone 199® (Dentsply Trubyte, USA) and Impact (Ivoclar Vivadent, Liechtenstein). Methods: The experimental polymer was prepared by copolymerizing MMA monomer and palm oil polyol. The resulting polymer was cast into a plate form and sectioned using a precision diamond saw (Buhler, Germany) to form 10 specimens of dimension, 65mm x 11mm x 5mm. These specimens were …
Demineralization Potential Of Qat Extracts At Composite Restoration Interface, Noor Hayaty Abu Kasim Abu Kasim N.H.
Demineralization Potential Of Qat Extracts At Composite Restoration Interface, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Objective: To evaluate the demineralization potential of qat extracts at composite restoration interface. Methods: Class V cavities were prepared on the buccal surface of thirty extracted sound premolars and were restored with a nanohybrid composite (Grandio, VOCO, Germany). Specimens were subsequently coated with nail varnish exposing 2mm of enamel around the restoration margin. The specimens were divided into three equal groups of 10 and were then immersed in acid gel and qat extracts (10% and 20%) for 4 weeks. All specimens were removed and washed using deionized water and later examined by direct vision and stereomicroscope prior to sectioning. Specimens …
Rolling Ball Contact As A Method For Testing Surface Fatigue Of Resin Based Restorative Materials, Noor Hayaty Abu Kasim Abu Kasim N.H.
Rolling Ball Contact As A Method For Testing Surface Fatigue Of Resin Based Restorative Materials, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
It has been recognised that compressive, tensile and flexural strength do not accurately determine the durability of dental restorations and that fatigue induced failure plays an important role. Fatigue caused by cyclic loading is thought to be responsible for the failure of composites restorations described by chipping, localized or generalized wear and fracture. The main aim of this work is to develop and evaluate the rolling ball contact as a method for testing surface fatigue of resin-based restorative materials. The results showed that material loss during the testing period mimic that of a fatigue failure process occurring in rolling elements. …
Fabrication Of 316l Stainless Steel Parts By Injection Moulding For Biomedical Application Using A Novel Binder, Noor Hayaty Abu Kasim Abu Kasim N.H.
Fabrication Of 316l Stainless Steel Parts By Injection Moulding For Biomedical Application Using A Novel Binder, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
This paper focuses on the usage of a novel binder system base on palm oil product to produce sintered parts of stainless steel 316L produced by vertical injection molding technique for biomedical application. The stainless steel 316L powder was mixed using z-blade mixer with the thermoplastic binder system comprising of polyethylene, paraffin wax, stearic acid and palm stearin which was derived from palm oil at different volume percent (%). The feedstock then was studied in term of viscosity and shear rate using capillary rheometer. The feedstock was molded using vertical injection molding machine. After molding, the green molded part was …
Effect Of Mouthrinses On Surface Microhardness Of Selected Dental Composites, Noor Hayaty Abu Kasim Abu Kasim N.H.
Effect Of Mouthrinses On Surface Microhardness Of Selected Dental Composites, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Objective: To compare the surface microhardness of composites(Spectrum®TPH, Filtek™Z350, Ceram•X mono and Ceram•X duo-enamel shade) before and after immersion in alcohol containing mouthrinses (Listerine), alcohol-free mouthrinses (Oral-B) and experimental herbal mouthrinses based on plant extract (mouthrinses X, Y and Z). Methods: 60 disc-shaped specimens of approximately 10mm x 2mm were perpared from various composites using perspex split mould and was cured for 40 seconds. The irradiated surface was polished using Sof-Lex pop-on polishing discs. The specimens were randomly divided to 6 groups. Microhardness was recorded before immersion (control group) using a load of 200g for 15 seconds using Vickers microhardness …
Shear Bond Strength Of Orthodontic Adhesives On Different Tooth Types: An In Vitro Study, Noor Hayaty Abu Kasim Abu Kasim N.H.
Shear Bond Strength Of Orthodontic Adhesives On Different Tooth Types: An In Vitro Study, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Introduction: Owing to the variety of materials and methods employed, comparison of the results and findings from bonding studies is difficult. Until recently, several types of teeth have been used in published research papers as a substrate in orthodontic bonding research including bovine incisors, fresh and rebonded human premolars. Objectives: The purpose of this study was to compare the shear bond strength of an adhesive bonded to different tooth surfaces (human premolar, bovine incisor and rebonded human premolar). Methods: Two groups of thirty premolar teeth and one group of bovine incisors had brackets attached in a standardized manner using Transbond …
Multiple Intelligences And Academic Performance Among Malaysian Undergraduate Dental Students, Noor Hayaty Abu Kasim Abu Kasim N.H.
Multiple Intelligences And Academic Performance Among Malaysian Undergraduate Dental Students, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Objectives: To identify the nature of multiple intelligences among dental students and investigate the relationship between these intelligences and performance in the various skill areas of dentistry. Methods: Sixty-one final year dental students at the Faculty of Dentistry, University of Malaya in Malaysia were administered a Multiple Intelligence Inventory [(MII), David Larear, 1991)] after their final written examinations. MII comprised 80 4-point likert items assessing eight types of multiple intelligences: Verbal/Linguistic, Visual Spatial, Logical Mathematical, Musical Rhythmic, Intra Personal, Body Kinesthetic, Inter Personal and Naturalist. These intelligences were correlated with six academic performance scores: Amalgam Class II, Composite, Crown & …
Investigating Examiner Consistency In Criterion-Based Assessment Using Rasch Measurement, Noor Hayaty Abu Kasim Abu Kasim N.H.
Investigating Examiner Consistency In Criterion-Based Assessment Using Rasch Measurement, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
In the implementation of criterion-based assessment some disparities in the interpretation of the assessment criteria have been observed.Therefore it is essential that a standardization exercise be carried out to ensure equitable and fair assessment. Objectives: The purpose of the study was to evaluate inter-examiner variability and examiners' internal consistency in applying a criterion-based assessment. Method: The subjects consisted of 9 full-time staff of the Department of Conservative Dentistry, University of Malaya, 4 part-time staff and 2 postgraduate students. One buccally-approached and one palatally-approached Class III cavity preparation were assessed according to a set of criteria developed by the department. Both …
The Effects Of Oxygen-Based Disinfectant On Dimensional Accuracy Of Alginates, Noor Hayaty Abu Kasim Abu Kasim N.H.
The Effects Of Oxygen-Based Disinfectant On Dimensional Accuracy Of Alginates, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Objective: This study evaluated the effect of an active oxygen based disinfectant, 2% Perform® (Schulke & Mayr, Germany) on the dimensional accuracy of four alginates, Alginoplast (Heraeus Kulzer, Holland), Kromopan (LASCOD, Italy), Alginmax (MAJOR, Italy) and Duplast (Dentsply, China). Method: A cobalt chromium master model with four cylindrical studs representing 2 canines and 2 molars was constructed. A total of 40 impressions for each alginates were taken and treated in 4 different conditions, Immediate pour (control); 10 minutes immersion in distilled water; 10 minutes immersion in 2% Perform® and 30 minutes in 2% Perform®. The impressions were then poured in …
Cleaning Ability Of Disinfectants For Dental Steel Burs, Noor Hayaty Abu Kasim Abu Kasim N.H.
Cleaning Ability Of Disinfectants For Dental Steel Burs, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Dental burs are a source of bacterial contamination due to its direct contact with carious teeth, saliva and blood. Objective: The aim of this study was to evaluate the disinfecting and cleaning ability of selected commercially available disinfectants on dental burs. Method: Size 5 round stainless steel burs were used to excavate caries from freshly extracted human molars. The burs were then immediately immersed in Grotanat Drill Bath (Shülke & Mayr, Germany), Micro 10 (Unident, Swizerland), Gigasept FF (Shülke & Mayr, Germany), Lysetol AF (Shülke & Mayr, Germany) and 70% Isopropyl alcohol (J.Y. Baker, USA) according to the manufacturer's instructions. …
Dental Students' Perception Towards Effective Clinical Feedback And Assessment, Noor Hayaty Abu Kasim Abu Kasim N.H.
Dental Students' Perception Towards Effective Clinical Feedback And Assessment, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Supervised practice in the dental clinic is one of the teaching tools in preparing a good dental practitioner. Teachers who are efficient in helping students learn in these settings improve this process. The ability to impart good feedback and carry out proper assessment is an important measure of effectiveness. Objective: The purpose of this study was to investigate the perception of students from the Faculty of Dentistry, University of Malaya towards effective clinical feedback and assessment from the staff of the Dept. of Conservative Dentistry. Method: A 4-point Likert-type scale questionnaire was formulated according to Myers, 1977 (J.Dent.Edu 41:68-76). Aspects …
Clinical Evaluation Of A Compomer In The Restoration Of Class I And Ii Cavities In Permanent Posterior Teeth: 1-Year Results, Noor Hayaty Abu Kasim Abu Kasim N.H.
Clinical Evaluation Of A Compomer In The Restoration Of Class I And Ii Cavities In Permanent Posterior Teeth: 1-Year Results, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
The clinical performances of a compomer (Dyract AP") is combination with a non-rinse conditioner (K-0100”) and self-priming adhesive (K-0 I07”) were compared with a hybrid composite resin (Spectrum TPH”) in combination with a 36% phosphoric acid conditioner (DeTrey Conditioner”) and self-priming adhesive (K-0107”) in a randomized controlled split-mouth model. 23 patients with bilateral occlusal and/or interproximal caries had their teeth restored with Dyract AP in one quadrant and Spectrum TPH in the opposite quadrant by either one of the 2 evaluators. Removal of tooth structure was as dictated by caries and access. All non-caries fissures were sealed with either a …
Thermocycling As A Means Of Inducing Mechanical Fatigue In Dental Composites, Noor Hayaty Abu Kasim Abu Kasim N.H.
Thermocycling As A Means Of Inducing Mechanical Fatigue In Dental Composites, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
The effect of thermocycling on the fatigue behaviour of 5 commercially available dental composites; P50(P)1, Silux Plus(S)2, Heliomolar(H)3, Clearfil Photo Posterior-light activated(CLA)4 and Clearfil Posterior-chemically activated(CC)5 was investigated. One hundred and ten rectangular bar specimens were prepared for each materil and divided into 11 groups of 10 each. Test groups 1-6 were subjected to 0, 250, 500, 750, 1000 and 1000 thermal cycles respectively. Each thermal cycle consisted of 1 minute immersion time of 50 seconds per change. The control groups 7-11 were stored in distilled water at 370c for the equivalent time to complete 250, 500, 750, 1000 and …
The Radiopacity Of Dental Prostheses (Fixed And Removable) On Plain Radiographs-An Experimental Study, Noor Hayaty Abu Kasim Abu Kasim N.H.
The Radiopacity Of Dental Prostheses (Fixed And Removable) On Plain Radiographs-An Experimental Study, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
The impaction of dental prostheses in either the airway or esophagus is an under-recognized problem which may result in severe morbidity or even mortality. The radio-opacity and the size of fixed and removable dental prostheses in an animal carcass was investigated. Prostheses were placed one at a time in the oro-laryngopharynx or in tho trachea and the esophagus. Lateral radiographs were taken for each prosthesis in site. The radio-opacity and size of the prostheses on the radiograph was graded. Most of the prostheses investigated were radio-opaque though the removable prostheses were more likely to be radiolucent and differ in size. …
Effect Of Thermocycling On The Fracture Toughness Of Composites, Noor Hayaty Abu Kasim Abu Kasim N.H.
Effect Of Thermocycling On The Fracture Toughness Of Composites, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Fracture toughness has been recognised to be one of the most important mechanical property for retorative materials. It is the aim of this study to investigate the effect of thermocycling an fracture toughness of a range of dental composites; P50(P)1 , Silux Plus(S)2, Heliomolar(H)3, Clearfil Photo Posterior-light activated(CLA)4 and Clearfil Posterior-chemically activated(CC)3. 110 rectangular pre-notched specimens was prepared for each material utilising a stainless steel mould. The specimens were divided into 11 groups of 10 each. Test groups 1-6 were subjected to 0, 250, 500, 750, 1000 and 10,000 thermal cycles respectively. All specimens were subjected to a 3 point …
Microleakage Testing, Noor Hayaty Abu Kasim Abu Kasim N.H.
Microleakage Testing, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Microleakage testing has been used to determine the possible clinical performance of a restorative material. Many microleakage testing materials have been developed and performed through the years. There has been no agreement as to which testing methodology would give the most accurate results. Attempts have been made to simulate the oral conditions and to give a more quantitative representation of micro leakage. The different micro leakage testing methodologies are presented in this paper.