Forums › Nd:YAG lasers › General Nd:YAG Forum › Interesting article
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Glenn van AsSpectatorThought Bob, and others would enjoy this topic that appeared in the lit for me today……..cool result.
Glenn
Arch Oral Biol. 2006 Feb 2; [Epub ahead of print] Related Articles, Links
A comparison between the occluding effects of the Nd:YAG laser and the desensitising agent sensodyne on permeation through exposed dentinal tubules of endodontically treated teeth: An in vitro study.
Al-Azzawi LM, Dayem RN.
Department of Oral Pathology, College of Dentistry, University of Baghdad, Baghdad, Iraq.
OBJECTIVE: Dentine hypersensitivity may occur due to loss of covering enamel and/or loss of cementum after gingival recession, resulting in exposure of cervical dentine and patency of dentinal tubules. The effect of thermally cooled pulsed neodymium:yttrium-aluminium-garnet (Nd:YAG) laser on the permeability and structural appearance of the root canal wall was investigated in vitro. The aim of this study was to compare the occluding effect of Nd:YAG laser with that of sensodyne on exposed dentine. MATERIAL AND METHODS: Forty freshly extracted human maxillary anterior teeth were collected at random. Root canal obturations were performed using master apical file no. 60 k-type for obturated teeth. All teeth were stored in 100% humidity at 37 degrees C for 48h to allow time for the sealer to set. Dentine of 35 teeth was exposed by removing the cementum, and the remaining five teeth represented a negative control group. Specimens were examined using stereomicroscopy to show the surface topography of the dentine substrate before and after treatment with Nd:YAG laser or sensodyne. RESULTS: A double-blind technique was used when taking measurements of ink penetration (in mm) for each group. Teeth treated by Nd:YAG laser showed the least ink penetration, followed by teeth treated by sensodyne. The positive control group demonstrated complete ink penetration and the negative control group showed no ink penetration. Stereomicroscopic examination of specimens treated with Nd:YAG laser showed deposition on the dentinal surface, and specimens treated with sensodyne showed partial deposition. Untreated specimens were free of deposition and the tubules remained patent. CONCLUSION: There is no significant difference in the occluding effect of Nd:YAG laser and sensodyne toothpaste. Both treatments have a promising effect on the reduction of permeation through exposed dentinal tubules. However, the occluding effect of Nd:YAG laser occurs within seconds whereas that of sensodyne takes at least 3 weeks.
Robert Gregg DDSSpectatorThanks Glenn,
Yes, very interesting. The results is not much of a surprise, but the origins of the research is………
I mean, when was the last time we saw any research come from Bagdad?
Bob
dlawlerSpectatorBob, what settings would you suggest with the Periolase to eliminate dentinal sensitivity?
David
Robert Gregg DDSSpectatorStart with 2.0 watts, 100usec, 20 Hz and at several inches distance to establish comfort. Then 200 to 400 joules per tooth.
To etch dentin, and occlude tublues, use the Dentin Etch setting.
Bob
etienneSpectatorHi Bob
Do you remain several inches from the tooth?Do you treat in contact with tooth structure when you etch dentin? Can you suggest a clinical situation where you would want to do that? Any restoration? Care to share the dentin etch setting?
Thanks
Etienne(Edited by etienne at 3:42 pm on June 6, 2006)
Robert Gregg DDSSpectatorHi Bob
Do you remain several inches from the tooth?
No, I attempt to move in.
Do you treat in contact with tooth structure when you etch dentin?
Yes.
Can you suggest a clinical situation where you would want to do that? Yes. Any restoration? Yes. Care to share the dentin etch setting?
On your laser? The shortest PD (150 I think) and 300 mj/pulse. Can you get that much mj per pulse?
Thanks
EtienneSure. Bob
etienneSpectatorHi Bob
Cut another notch in your (laser)gun! I tried your desensitising settings last week on a patient where Sensodyne had failed. Saw her again today for a follow up and sensitivity is gone!!
Thanks for your help (again…)
Take care
Etienne
Robert Gregg DDSSpectatorEtienne,
Another awesome result with a FR pulsed Nd:YAG!
Well done!
Bob
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