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Archive for March 17th, 2014

Mar 17 2014

Dental Research Seminar

Published by Dental Library under Dentistry
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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.

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