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Full-Text Articles in Dental Public Health and Education
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.
A Rolling-Ball Device For Producing Surface Fatigue And Its Application To Dental Materials, Noor Hayaty Abu Kasim Abu Kasim N.H.
A Rolling-Ball Device For Producing Surface Fatigue And Its Application To Dental Materials, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
A new method of producing and evaluating surface fatigue using a rolling-ball device has been developed. The method involves constraining a rolling ruby ball between the ''v'' groove of a rotor and the test specimen. The ball applies a compressive stress to the surface of the test material whilst it rolls in a circular pattern across the specimen surface. The fatigue life is defined as the time taken for surface degradation to begin to occur. The method is simple and reproducible and allows fatigue data to be gathered using a relatively small number of specimens. A series of model dental …
The Ball Mill As A Means Of Investigating The Mechanical Failure Of Dental Materials, Noor Hayaty Abu Kasim Abu Kasim N.H.
The Ball Mill As A Means Of Investigating The Mechanical Failure Of Dental Materials, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
Objective: The main purpose of this paper is to present a new method of predicting clinical performance using mechanical loading in a ball mill. Methods: A series of four experiments (two involving a hybrid composite and one each on orthodontic brackets and bands) is described in which the ball mill was used to subject specimens to mechanical fatigue. Results: A reproducibility study using composite beam specimens showed no significant difference between the Mean Survival Time (MST) in all the three experimental runs (P = 0.42). When subjected to thermal cycling, the MST of the cycled group was 155.0 min compared …
The Effect Of Thermocycling On The Fatigue Behavior Of Dental Composites, Noor Hayaty Abu Kasim Abu Kasim N.H.
The Effect Of Thermocycling On The Fatigue Behavior Of 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 2 microfilled composites; Silux Plus3 and Heliomolar2 and 3 hybrid composites; P502, Cleafil Photo Posterior3 (both light-activated) and Cleafil Posterior3 (chemically-activated) was investigated using a ball mill. Ninety specimens (2 x 2 x 25mm) of each material were used. The specimes were divided into 3 groups of 30 and were stored for 24 h in water at 37oC (Group A), subjected to 104 thermal cycle over 45 days (Group B) and stored in water at 37oC for 45 days (Group C). Ten specimens of each material were tested in a 0.5 …
Impact Strength Of An Experimental Polyurethane-Based Polymer, Noor Hayaty Abu Kasim Abu Kasim N.H.
Impact Strength Of An Experimental Polyurethane-Based Polymer, Noor Hayaty Abu Kasim Abu Kasim N.H.
Noor Hayaty Abu Kasim Abu Kasim N.H.
The impact strength of a newly developed experimental polyurethane-based polymer which is derived from palm oil (Experimental PU) was compared with denture polymers; heat-cured and self cured polymethyl methacrylate (PMMA) and Eclipse®, light-activated urethane dimethacrylate prosthetic resin system. Ten specimens were prepared using heat-cured PMMA (Meliodent® Heat Cure, Heraeus Kulzer, Germany), self cured PMMA (Meliodent® Rapid Repair, Heraeus Kulzer, Germany), Eclipse® baseplate resin (Dentsply, USA) and Experimental PU material. Specimens were prepared following manufacturer’s instructions except for the Experimental PU material where it was prepared in bulk and sectioned to the desired dimension, 64 x 6 x 4 mm. A …