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A method for rapid measurement of laser ablation rate of hard dental tissue
Perhavec, Tadej (Avtor), Gorkič, Aleš (Avtor), Bračun, Drago (Avtor), Diaci, Janez (Avtor)

URLURL - Predstavitvena datoteka, za dostop obiščite http://dx.doi.org/10.1016/j.optlastec.2008.08.007 Novo okno

Izvleček
The aim of the study reported here is the development of a new method which allows rapid and accurate in-vitro measurements of three-dimensional (3D) shape of laser ablated craters in hard dental tissues and the determination of crater volume, ablation rate and speed. The method is based on the optical triangulation principle. A laser sheet projector illuminates the surface of a tooth, mounted on a linear translation stage. As the tooth is moved by the translation stage a fast digital video camera captures series of images of theilluminated surface. The images are analyzed to determine a 3D model of the surface. Custom software is employed to analyze the 3D model and to determine the volume of the ablated craters. Key characteristics of the method are discussed as well as some practical aspects pertinent to its use. The method has been employed in an in-vitro study to examine the ablation rates and speeds of the two main laser types currently employed in dentistry, Er:YAG and Er,Cr:YSGG. Ten samples of extracted human molar teeth were irradiated with laser pulse energies from 80 mJ to the maximum available energy (970 mJ with the Er:YAG, and 260 mJ with the Er,Cr:YSGG). About 2000 images of each ablated tooth surface have been acquired along a translation range of 10 mm, taking about 10 s and providing close to 1 million surface measurement points. Volumes of 170 ablated craters (half of them in dentine and the other half in enamel) were determined from this data and used to examine the ablated volume per pulse energy and ablation speed. The results show that, under the same conditions, the ablated volume per pulse energy achieved by the Er:YAG laser exceeds that of the Er,Cr:YSGG laser in almost all regimes for dentine and enamel. The maximum Er:YAG laser ablation speeds (1.2 mm3/s in dentine and 0.7 mm3/s in enamel) exceed those obtained by the Er,Cr:YSGG laser (0.39 mm3/s in dentine and 0.12 mm3/s in enamel). Since the presented method proves to be easy to use and allows quite rapid measurements it may become a valuable tool to study the influence of various laser parameters on the outcome of laser ablation of dental tissues.

Jezik:Angleški jezik
Ključne besede:digitalni sistemi, laserji, zobozdravstvo, tridimenzionalni modeli
Vrsta gradiva:Delo ni kategorizirano (r6)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Leto izida:2008
Št. strani:str. 397-402
Številčenje:Vol. 41, issue 4
UDK:620.111:531.717.2
ISSN pri članku:0030-3992
DOI:10.1016/j.optlastec.2008.08.007 Povezava se odpre v novem oknu
COBISS.SI-ID:10819867 Povezava se odpre v novem oknu
Število ogledov:472
Število prenosov:156
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
 
Skupna ocena:(0 glasov)
Vaša ocena:Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.
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Gradivo je del revije

Naslov:Optics and laser technology
Skrajšan naslov:Opt. Laser Technol.
Založnik:Elsevier
ISSN:0030-3992
COBISS.SI-ID:26072576 Novo okno

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