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Mar 21 2014

Dental Research Seminar

Published by Dental Library under Dentistry
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Date: March 28, 2014 (Friday)

Time: 12:45 p.m. to 1:15 p.m.

Venue: Lecture Theatre II, G/F, The Prince Philip Dental Hospital

 

Presenter: Ms. Epasinghe Don Jeevanie, PhD Candidate

 

Title: Potential Applications of Proanthocyanidin for Reparative Therapies in Dentistry

 

Abstract: In dentistry, repair and restoration of tooth structure to regain its mechanical properties is the ultimate aim of caries management. Since collagen is the major part of dentine it is necessary to strengthen and preserve collagen matrix when repairing lesions involved in dentine. Proanthocyanidin is a naturally derived collagen cross linker which can strengthen and protect the collagen fibers from degradation. The present study aimed to investigate the potential applications of proanthocyanidin in dentistry.

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Mar 20 2014

Dental Research Seminar

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Date: March 27, 2014 (Thursday)

Time: 12:45 p.m. to 1:30 p.m.

Venue: Lecture Theatre II, G/F, The Prince Philip Dental Hospital

                                                          

Presenter: Dr. Leung Yiu Yan, PhD Candidate

 

Title: Prevention and treatment of neurosensory disturbance after lower third molar surgery

 

Abstract: Neurosensory deficit is a well-reported complication after lower third molar surgery. It is useful to know the outcomes of the available treatments for neurosensory deficit after third molar surgery. It is more important to prevent nerve injury from third molar surgery. A study on quality of life and psychological well-being was conducted to investigate their impact on patients with permanent neurosensory deficit after lower third molar surgery. The result of a study on the longitudinal outcome of microsurgical repair after nerve injury from lower third molar surgery will be presented. The long-term safety of coronectomy of lower third molar was investigated and the morbidities and root behavior will be presented.

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Mar 17 2014

Dental Research Seminar

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Date: March 24. 2013 (Monday)
Time: 12:45 p.m. to 1:45 p.m.
Venue: Lecture Theatre II, G/F, The Prince Philip Dental Hospital
 
Presenter: Miss Guo Yan, PhD Candidate (12:45 p.m. to 1:15 p.m.)

Title: Aspects of Charge Generation on Ti Surface using a Triboelectric Approach

Abstract: Titanium and its alloys have been widely used as a material for dental subgingival implants, and one main reason is their unique ability to osseointegrate with the host bone. The rate and quality of osseointegration of a titanium dental implant depends strongly upon its surface properties. A negative charge has been known to promote the osseointegration of titanium. The current investigations revealed that sandblasting can generate a negative charge on the surface of Ti substrates, due to the triboelectric effect. The same was observed with Ti and stainless steel mini orthodontic implants studied.

The results of the current study suggested that sandblasting could generate static charges on titanium and stainless steel surfaces. However, such charges gradually dissipate into the atmosphere. The amount, polarity, and the decay rate of the charge depend on many factors tested in the experiments. These obtained results might help explaining the beneficial effects of sandblasting on the osseointegration of titanium implants.

 
Presenter: Mr. Liu Dan, PhD Candidate (1:15 p.m. to 1:45 p.m.)

Title: Some Surface Treatments for Improving the Durability of Zirconia-Based Restorations

Abstract: Although zirconia has been increasingly used in modern dental practice, the application of zirconia-based dental restorations is still constrained by the relatively weak bonding. This includes porcelain to zirconia bonding, and resin to zirconia bonding. The current laboratory study was aiming to evaluate the effects of some new modified surface treatments on the adhesion durability of dental zirconia.

It was found that porcelain zirconia bonding could be effectively enhanced by applying both sandblasting and a new laser irradiation approach. Laser irradiation might be a potential approach as a surface treatment for improving the quality of porcelain zirconia bonding. Strong and reliable resin zirconia integration could not be achieved without appropriate surface pre-treatment. The new coating treatment is a promising approach for strengthening resin to zirconia adhesion.

No responses yet| 84 views

Mar 12 2014

Dental Research Seminar

Published by Dental Library under Dentistry
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Date: March 19, 2014 (Wednesday)
Time: 12:45 p.m. to 1:45 p.m.
Venue: Lecture Theatre II, G/F, The Prince Philip Dental Hospital

 

Presenter: Mrs. Gao Wenling, PhD Candidate (12:45 p.m. to 1:15 p.m.)

Title: The Diversity of Subgingival Microbiota in Periodontal Pockets

Abstract: Periodontal disease is a spectrum of infectious inflammatory diseases of the periodontium, which result from an inappropriate interaction between the subgingival microbes and adjacent tissues. It has a highly complex etiology, as the composition of microbial biofilms is vast and highly variable. Many microbes in subgingival plaque cannot yet be cultivated, and so molecular approaches are widely considered to be the most effective methods for analyzing its composition. This study aims to use contemporary molecular-based approaches, such as high throughput DNA sequencing, to investigate subgingival bacteria diversity within subjects with chronic and aggressive forms of periodontitis, gingivitis compared to those with good periodontal health. Particular focus will be given to oral spirochetes, such as the red complex bacterium Treponema denticola, which has consistently been observed to be prevalent within diseased periodontal pockets.

 
Presenter: Mr. Hui Xiang, PhD Candidate (1:15 p.m. to 1:45 p.m.)

Title: Periodontal resident cell autophagy modulated by LPS pattern recognition and tissue hypoxia

Abstract: Periodontitis is a gram-negative microbes-induced chronic inflammation that destroys tooth-supporting structures. The mechanism of disease initiation remains not fully understood. Autophagy is a conserved cellular process essential for development and inflammation. The role, if any, of autophagy in periodontitis pathogenesis was not clear. This study aims to investigate the role of autophagy in periodontal resident cell, including endothelial cell, in growth, survival, differentiation and migration with special emphasis on relationship between TLR4 signaling and/or hypoxia.

No responses yet| 58 views

Feb 17 2014

Dental Research Seminar

Published by Dental Library under Dentistry
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Date: February 24, 2014 (Monday)
Time: 12:45 p.m. to 1:45 p.m.
Venue: Lecture Theatre II, G/F, The Prince Philip Dental Hospital

 

Presenter: Ms. Rao Ninajing, PhD Candidate (12:45 p.m. to 1:15 p.m.)

Title: Study on the pathogenesis of Bisphosphonate-related Osteonecrosis of the jaws

Abstract: Bisphosphonate-related osteonecrosis of the jaws (BRONJ) is a rare but severe clinical complication related with Bisphosphonates (Bps) therapy, which is widely used for management a series of conditions accompanied by pathologically high bone resorption, such as Paget’s disease, osteoporosis and bone metastasis. And so far the underlying pathogenesis of BRONJ is still unknown. According to the relevant researches, multiple correlating factors might get involved in the development of BRONJ, including the efficacy and cumulative amount of Bps, dental surgical procedures as well as dental infection. The aim of the present  study is 1) to assess the significance of periapical infection in the development of Bisphosphonate-related osteonecrosis of the jaws and further explore its underlying pathophysiological mechanisms; 2) To assess the significance of Actinomyces onto the development of BRONJ. 80 12-weeks-old female C57BL/6N ovariectomized mice will be used in the study, 20 animals in each group. Clinical examination, Micro-CT scanning, immunohistochemistry will be used to observe morphological and histopathologic changes of jaw bones in this study.

 
Presenter: Mr. Huo Lei, PhD Candidate (1:15 p.m. to 1:45 p.m.)

Title: Effect of bisphosphonate on periodontal condition in compromised host

Abstract: Bisphosphonate related osteonecrosis of the jaw (BRONJ) has been reported as a serious complication on the patients received bisphosphonate treatment. The usage of this drug is mainly 1) low dose to enhance bone strength in postmenopausal women and aged people; 2) high dose to prevent and treat malignant skeletal complications in cancer patients. Although it is widely accepted that high-dose bisphosphonate is a high-risk factor in inducing osteonecrosis, some studies demonstrated  potential advantage of low-dose bisphosphonates in inhibiting alveolar bone resorption in progressive periodontitis. The objectives of this study are to investigate the effect of high and low doses bisphosphonates on periodontal condition using an ovariectomized rat model, and the risk of high/low doses bisphosphonates in inducing osteonecrosis in compromised host with progressive periodontitis. Clinical examination, Micro-CT, TUNEL staining, histology, immunohistochemistry and immunofluorescence labeling will be used to investigate morphological and histopathologic changes of jawbones under various experimental conditions.

No responses yet| 118 views

Jan 30 2014

Dental Research Seminar

Published by Dental Library under Dentistry
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Date: February 6, 2014 (Thursday)
Time: 12:45 p.m. to 1:30 p.m.
Venue: Lecture Theatre II, G/F, The Prince Philip Dental Hospital 

 

Presenter: Miss Dai Ruoxi, PhD Candidate

Title: A randomized clinical trial on the effect of powered toothbrushing and an antimicrobial mouthrinse on dental plaque, pathogenic microorganisms and health of stroke survivors during rehabilitation

Abstract: A combination of motor, sensory, and cognitive deficits often occurs after stroke and has sustained impacts on activities of daily living. Due to compromised abilities after stroke, an individual is unable to perform oral self-care to a satisfactory level. Stroke-associated orofacial deficits affect the ability to clear food debris out of the oral cavity and exacerbate poor oral hygiene. Consequently, increased dental plaque result in oral cavity acting as a reservoir not only for oral infections, but also systemic health problems such as aspiration pneumonia, which is one of the most common post-stroke infections. Recent evidence suggests a link between aspiration pneumonia and oral hygiene. Powered toothbrushing is likely to be more effective than conventional manual toothbrushing for disabled patients in attaining adequate oral hygiene. Chlorhexidine gluconate is considered to be the most effective chemical agent in dental plaque control. A combination of mechanical and chemical interventions has proven efficacy in reducing dental plaque and associated oral pathogens. Acknowledging the importance of oral health after stroke, we are now conducting a randomized clinical trial to evaluate the effectiveness of powered tooth brushing and a chlorhexidine anti-microbial mouthrinse in reducing dental plaque accumulation and oral pathogens among stroke patients during out-patient rehabilitation.

No responses yet| 115 views

Jan 16 2014

Dental Research Seminar

Published by Dental Library under Dentistry
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Date: January 22, 2014 (Wednesday)

Time: 12:45 p.m. to 1:45 p.m.

Venue: Lecture Theatre II, G/F, The Prince Philip Dental Hospital

 

 

Presenter: Mr. Pei Tao, PhD Candidate (12:45 p.m. to 1:15 p.m.)

Title: Dentoalveolar Development during Adolescence

Abstract: Dentoalveolar development, especially during adolescence, is of particular interest for treatment planning and post-treatment stability management in orthodontics. However, the accuracy and reliability of conventional plaster model analyses in determining dentoalveolar patterns and development have limitations compared to digital model analyses. Furthermore, understanding of changes in dentoalveolar development is scant, which in part relates to reliance on cross-sectional data of relatively small samples, and limited studies/data of a longitudinal nature. Using three-dimensional digital models, this proposed study aims to investigate dimensional changes and spatial displacement of dentoalveolar and bi-maxilla differential development during adolescence in the Hong Kong population. 

 

Presenter: Dr. Choi Wing Shan Winnie, PhD Candidate (1:15 p.m. to 1:45 p.m.)

Title: Effects of Ketamine in Post-operative Pain and Recovery Outcomes in Bilateral Third Molar Surgery under General Anaesthesia: A Randomised Clinical Trial

Abstract: Ketamine is an anesthetic drug that interacts with a number of receptor systems in the body and exhibits several clinical effects such as anesthesia, pain relief and positive effects on depressive mood. It has been shown to influence inflammatory response and limit the exacerbation of systemic inflammation without affecting the local healing processes. The aim of this study is to compare the postoperative pain and recovery outcomes in patients after surgical removal of wisdom teeth under general anaesthesia with or without receiving a single low dose of ketamine before incision. The magnitude of the effect will be compared with a positive control and a placebo injection. The amount of postoperative facial swelling will be measured using three dimensional laser surface scanning technique. Other postoperative outcomes and complications such as time to first painkiller request, total painkiller consumption, infection rate, adverse effects and patients’ satisfaction will also be compared.

 

 

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Jan 02 2014

Dental Research Seminar

Published by Dental Library under Dentistry
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Date: January 9, 2014 (Thursday)

Time: 12:45 p.m. to 1:30 p.m.

Venue: Lecture Theatre II, G/F, The Prince Philip Dental Hospital

                                                          

Presenter: Miss Wei Chenxuan, MPhil Candidate

 

Title: Investigation of Biofilm Formation on Dental Restorative Materials

 

Abstract: Teeth are a very important functional part of the human body, and greatly impact one’s appearance and physical well-being. Unfortunately, there are numerous reasons that may cause tooth loss, such as, dental caries and periodontal diseases.  Replacement of missing tooth structure with dental restorative materials a necessary part of appearance and function. Currently GIC and Resin composite are the most common selected material for clinical procedures in dental outcome. However, the adhesion of pathogenic biofilms can even be a significant reason that causes the failure of restorations, and may further aggravate dental caries or periodontal disease. At present not a lot is known about the growth of periodontal pathogenic bacteria on the surface of dental biomaterials. This study aims at investigating the formation of periodontal pathogenic biofilms along with cariogenic biofilm on different kinds of restorative materials.

 

In this seminar, a thorough introduction of the current research evidences and progress of the present study will be introduced, and then, the expected outcomes and implications will be presented.

No responses yet| 167 views

Dec 13 2013

Dental Research Seminar

Published by Dental Library under Dentistry
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Date: December 23, 2013 (Monday)

Time: 12:45 p.m. to 1:30 p.m.

Venue: Lecture Theatre II, G/F, The Prince Philip Dental Hospital

 

Presenter: Mr. Wen Yifeng, PhD Candidate

Title: Longitudinal photogrammetric analyses of the soft tissue facial features among Hong Kong adolescents

Abstract: Facial appearance greatly impacts one’s psychological well-being. Soft tissue facial analysis emerged in the 1900s, but it remained overshadowed by standardized cephalometric analysis. Until the1950s, it regained vitality since its irreplaceable role in orthodontic treatment planning was re-emphasized. Photogrammetric facial analyses have been performed among a variety of ethnics including Anatolian Turkish, North Americans, and Han Chinese, etc. However, most of these current studies are performed in adults and cross-sectional in nature. The present study aims at investigating the longitudinal growth changes of facial features among Hong Kong adolescents.In this seminar, a thorough literature review will be given first to highlight the current research status; then, the materials and methods of the present study will be introduced; finally, expected outcomes and their implications will be presented

No responses yet| 141 views

Nov 20 2013

Dental Research Seminar

Published by Dental Library under Dentistry
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Date: November 21, 2013 (Thursday)

Time: 12:45 p.m. to 1:15 p.m.

Venue: Lecture Theatre II, G/F, The Prince Philip Dental Hospital

Presenter: Dr. Acharya Aneesha, MPhil Candidate

Title: Periimplant Mucosistis in Indian Subjects as related to Periodontal Status

Abstract: Periimplant mucositis is highly prevalent and factors resulting in its progression to periimplantitis are unclear. Risk profiling of for progressive periimplant disease  is of clinical importance.This presentation will describe the background, a hypothesis regarding risk assement using combination of clinical and laboratory variabels in periimplant mucositis and present related data from a cohort of Indian subjects.

No responses yet| 136 views

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