A5049524155- Endodontics and Root Canal Treatments
- Dental Radiography and Imaging
- Dental materials and restorations
- Occupational health in dentistry
- Drilling and Well Engineering
- Dental Anxiety and Anesthesia Techniques
- Oral microbiology and periodontitis research
- Bacterial biofilms and quorum sensing
- Infective Endocarditis Diagnosis and Management
- Cardiac Valve Diseases and Treatments
- Dental Trauma and Treatments
- Dental Erosion and Treatment
- Dental Research and COVID-19
- Bone Metabolism and Diseases
- Engineering Technology and Methodologies
- Cardiac pacing and defibrillation studies
- Cardiac Structural Anomalies and Repair
- Inflammatory mediators and NSAID effects
- Nosocomial Infections in ICU
- Medical Malpractice and Liability Issues
- Advanced Sensor Technologies Research
- Engineering and Environmental Studies
- Antimicrobial agents and applications
- Dental Education, Practice, Research
- Laser Applications in Dentistry and Medicine
University of Hong Kong
2015-2024
University of Hong Kong - Shenzhen Hospital
2021-2024
Chinese University of Hong Kong
2002-2023
Prince Philip Dental Hospital
1994-2021
Prince of Wales Hospital
2017-2021
Faculty (United Kingdom)
2018-2020
Hong Kong College of Technology
2019
Castle Peak Hospital
2019
Hong Kong Baptist University
2010-2016
Rigshospitalet
2013-2015
The mechanism responsible for hydrogenperoxide- or sodium-hypochlorite-induced reductions in dentin bond strength is unknown. This vitro study tested the hypothesis that these oxidizing agents were by attempting to reverse effect with sodium ascorbate, a reducing agent. Human was treated oxidants before after being acid-etched and without post-treatment ascorbate. They bonded either Single Bond Excite. Hydrogen peroxide reduced strengths of both adhesives, while hypochlorite produced...
Oxygen inhibits polymerization of resin-based materials. We hypothesized that compromised bonding to bleached enamel can be reversed with sodium ascorbate, an anti-oxidant. Sandblasted human specimens were treated distilled water (control) and 10% carbamide peroxide gel or without further treatment ascorbate. They bonded Single Bond (3M-ESPE) Prime&Bond NT (Dentsply DeTrey) restored a composite. Specimens prepared for microtensile bond testing transmission electron microscopy after immersion...
Abstract Aim To investigate the mode of failure a brand nickel‐titanium instruments separated during clinical use, by detailed examination fracture surface. Methodology A total 122 ProTaper S1 were discarded from an endodontic clinic at stomatological school in China over period 17 months; 28 had fractured. These fractured ultrasonically cleaned, autoclaved and then examined under scanning electron microscope. From lateral view was classified into ‘torsional’ or ‘flexural’. The specimens...
Instrument fracture can be an unpleasant mishap during non‐surgical root canal treatment. While most stainless‐steel instruments appear to fail by excessive amounts of torque, the combined action torsional stress and cyclic loading (i.e. fatigue, as a result rotational bending, or repeated torsion) is responsible for breakage NiTi rotary files in use. Factors affecting incidence mode failures include instrumentation technique, use torque‐controlled motor, dimension surface condition...
We show that gecko microspinules (hairs) and their equivalent replicas, bearing nanoscale tips, can kill or impair surface associating oral pathogenic bacteria with high efficiency even after 7 days of repeated attacks. Scanning Electron Microscopy suggests there is more than one mechanism contributing to cell death which appears be related the scaling type hair arrays accessibility underlying nano-topography hierarchical surfaces.
Abstract Aim To investigate the new tissues growing into pulp space of immature dog teeth that were infected, disinfected and filled with blood clot ( BC ), dental cells DPC s), platelet‐rich plasma PRP ) or a combination s in apical periodontitis. Methodology Fifty‐six roots from mandibular premolars four beagles divided experimental groups n = 40) two control groups. After induction periodontitis, root canals Na OC l irrigation tri‐antibiotic paste medication. The then different materials...
To investigate the incidence of and factors associated with pulpal necrosis in vital teeth restored metal-ceramic crowns (CMCs) or crowned as part a fixed-fixed bridge.Patients who had CMC bridge retainer (BR) placed on tooth no previous history root canal treatment from 1981 to 1989 were retrieved computer records. The collated patients randomly selected their clinical records examined. Those satisfied inclusion criteria contacted offered review. After examination, long-cone paralleling...
To compare and evaluate the stress distribution of three NiTi instruments various cross-sectional configurations under bending or torsional condition using a finite-element analysis model.Three files (ProFile, ProTaper Universal) were scanned Micro-CT to produce three-dimensional digital model. The behaviour instrument loads was analysed mathematically in software (ABAQUS V6.5-1), taking into consideration nonlinear mechanical characteristic material.ProFile showed greatest flexibility,...