Naslov
Optical emission spectroscopy during treatment of hard dental tissue and dental materials

Autori
Bišćan, Marijan ; Šantak, Vedran ; Zaplotnik, Rok ; Popović, Dean ; Tarle, Zrinka ; Milošević, Slobodan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Izvornik
Bioplasmas and Plasmas with Liquids, Book of Abstracts / Vittorio Colombo and Matteo Gherardi - Bolonja, 2015, 108-108

Skup
Bioplasmas and Plasmas with Liquids, COST MP1101 & TD1208 Joint Conference

Mjesto i datum
Bologna, Italija, 13.09.2015. - 16.09.2015

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
atmospheric pressure plasma ; tooth bleaching ; optical spectroscopy

Sažetak
Recently, it was shown that low temperature atmospheric pressure plasma jet (APPJ) could be applicable to therapies in the field of dental medicine [1]. The opportunity to examine and understand interactions between APPJ and hard dental tissue, which include dentin, cementum and enamel, has not been fully exploited particularly at the fundamental level where surface science techniques can provide detailed information [2]. To characterize interaction between APPJ and hard dental tissue, XPS, AFM, OES and contact angle measurements were conducted. This results bring APPJ closer to clinical application in dental medicine [3, 4]. Here we use optical emission spectroscopy during treatment of various hard dental tissues and gels used for tooth whitening in order to develop in situ monitoring method. Plasma needle used in this study consist of a 100 μm thick copper wire inserted in the capillary glass tube (outer diameter 1.5 mm), gas supply and high-frequency voltage generator which is described in more details in Ref. [3]. The mean applied power was 2–4 W, frequency 25 kHz, root mean square voltage of 2.5 kV and the process gas was helium. Argon flow was 2 l/min and the end of capillary tube was typically 1-2 cm from the surface of the tooth. OES spectra were recorded simultaneously by means of two miniature fiber spectrometers (Avantes AvaSpec 3648) with a 3648- pixel CCD detector array, 75 cm focal length and nominal spectral resolution of 0.8 and 0.3 nm in the optical range from 200 to 1100 nm. In order to study influence of plasma-hard dental tissue interaction on optical emission, the light was collected from two regions: perpendicular to the jet on the APPJ exit (spectrometer up) and at an angle of about 45° towards the sample (spectrometer down). Collimating lenses were positioned about 3 cm from the APPJ. The integration time was set to 250 ms and the average was made across 10 collected spectra. Time evolution of optical spectra was recorded, evaluated and compared for different hard dental tissues and tooth whitening gels. Atmospheric pressure plasma jet activates bleaching gel, accelerates OH production and accelerates tooth bleaching [3, 4].

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Dentalna medicina

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