Island Mak - (26/07/2012 12.27)

It is interesting to learn that there is a glory hole at the matrix during preparation in order to make the class II restoration contacting tightly with the adjacent teeth. However, I am not sure whether the dental floss can pass through the interproximal area or not. It doesn't show at the lecture that the floss can pass through the interproximal area. or not.

Alaa Qari - (25/10/2010 15.09)

very useful lecture thanks.. I like it so much..

Glenn van As - (14/03/2010 13.19)

[quote=gordon west]Glenn,
Nice overview of the sectional ring systems, I too like the V3. Which bonding system and composite are you using? Do you have any research to back the use of laser on the dentin? Thanks again and nice job.
[/quote]

Hi Gordon, thanks for the compliment. Yes there is a study that looked at bacterial disinfection of 20 preps using ErYAG and bacterial growth vs 20 preps not using the laser.

In all but one of the 20 preps using the laser - no bacterial growth were observed.

Here is a study that showed dentin bacterial reduction up to 500 microns. Lasers will disinfect well, that has been shown in both perio and endo research. The aim is not to improve bonding but more to disinfect and open up the dentin for bonding.

Glenn

Lasers Med Sci. 2009 Jan;24(1):75-80. Epub 2007 Nov 20.
Decontamination of deep dentin by means of erbium, chromium:yttrium-scandium-gallium-garnet laser irradiation.
Franzen R, Esteves-Oliveira M, Meister J, Wallerang A, Vanweersch L, Lampert F, Gutknecht N.

Department for Conservative Dentistry, Periodontology and Preventive Dentistry (ZPP), RWTH Aachen University, Aachen, Germany. rfranzen@ukaachen.de
The aim of this in vitro study was to evaluate the depth of effectiveness of erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser irradiation on microorganism reduction. From human roots, dentin slices of 100 microm to 1,000 microm thickness were prepared. These specimens were sterilized and then inoculated with 1 microl of Enterococcus faecalis suspension. The backs of the specimens were then irradiated with Er,Cr:YSGG radiation at a pulse energy of 3.13 mJ, delivered at an incidence angle of 5 degrees to the dentin slice surface. A control group was left without irradiation. The remaining bacteria were collected in 1 ml sterilized NaCl solution, serially diluted and seeded in Columbia-Agar plates. Despite the low pulse energy of 3.13 mJ, the Er,Cr:YSGG laser irradiation resulted in significant bacterial reduction up to a dentin thickness of 500 microm (P < 0.05). Scanning electron microscopy (SEM) micrographs of the contaminated and irradiated surfaces showed the absence of a smear layer and opened dentinal tubules.

gordon west - (28/02/2010 9.29)

Glenn, Nice overview of the sectional ring systems, I too like the V3. Which bonding system and composite are you using? Do you have any research to back the use of laser on the dentin? Thanks again and nice job.

Carlos A. Ramirez Schleske - (02/01/2010 9.51)

Excelent for everyday practice. Great tips . Five stars

Steven Chou - (29/11/2009 10.39)

Very practical videos for daily restorative dentistry. Five stars