Vedran Santak1, Rok Zaplotnik1, Slobodan Milosevic2, Eva Klaric3, Zrinka Tarle3. 1. Community Health Center, Runjaninova 4, 10000 Zagreb, Croatia Institute of Physics, Bijenicka 46, 10000 Zagreb, Croatia. 2. Institute of Physics, Bijenička 46, 10000 Zagreb, Croatia. 3. Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia.
Abstract
OBJECTIVE: To study the effect of atmospheric pressure plasma (APP) jet as a potential accelerator of the degradation of hydrogen peroxide in bleaching gels which could lead to better and faster bleaching. MATERIAL AND METHODS: 25 pastilles of hydroxylapatite were colored in green tea for 8 hours and were randomly divided into five groups (n = 5). The bleaching process was performed with 30% and 40% hydrogen peroxide (HP) gel alone and in conjunction with helium APP jet. During the bleaching treatment, optical emission spectroscopy and non-contact surface temperature measurement using pyrometer were performed. Color of the pastilles was determined by a red-green-blue (RGB) colorimeter. PH values of bleaching gels were measured before and after the plasma treatment on additional 10 pastilles using a pH meter with contact pH electrode. RESULTS: The color measurements of pastilles before and after the treatment showed that treatment with APP jet improved the bleaching effect by 32% and 15% in the case of 30% and 40% HP gel. Better results were obtained approximately six times faster than with a procedure suggested by the bleaching gel manufacturer. Optical emission spectroscopy proved that plasma has a chemically active role on the gel. After the APP treatment, pH values of bleaching gels dropped to about 50-75% of their initial value while the surface temperature increased by 8-10˚C above baseline. CONCLUSION: The use of plasma jet provides more effective bleaching results in a shorter period of time without a significant temperature increase which may cause damage of the surrounding tissue.
RCT Entities:
OBJECTIVE: To study the effect of atmospheric pressure plasma (APP) jet as a potential accelerator of the degradation of hydrogen peroxide in bleaching gels which could lead to better and faster bleaching. MATERIAL AND METHODS: 25 pastilles of hydroxylapatite were colored in green tea for 8 hours and were randomly divided into five groups (n = 5). The bleaching process was performed with 30% and 40% hydrogen peroxide (HP) gel alone and in conjunction with helium APPjet. During the bleaching treatment, optical emission spectroscopy and non-contact surface temperature measurement using pyrometer were performed. Color of the pastilles was determined by a red-green-blue (RGB) colorimeter. PH values of bleaching gels were measured before and after the plasma treatment on additional 10 pastilles using a pH meter with contact pH electrode. RESULTS: The color measurements of pastilles before and after the treatment showed that treatment with APPjet improved the bleaching effect by 32% and 15% in the case of 30% and 40% HP gel. Better results were obtained approximately six times faster than with a procedure suggested by the bleaching gel manufacturer. Optical emission spectroscopy proved that plasma has a chemically active role on the gel. After the APP treatment, pH values of bleaching gels dropped to about 50-75% of their initial value while the surface temperature increased by 8-10˚C above baseline. CONCLUSION: The use of plasma jet provides more effective bleaching results in a shorter period of time without a significant temperature increase which may cause damage of the surrounding tissue.
Authors: Juliana G Magalhães; Angela R K Marimoto; Carlos R G Torres; Clovis Pagani; Symone C Teixeira; Daphne C Barcellos Journal: Acta Odontol Scand Date: 2011-07-25 Impact factor: 2.331
Authors: Rafael Guerrero-Preston; Takenori Ogawa; Mamoru Uemura; Gary Shumulinsky; Blanca L Valle; Francesca Pirini; Rajani Ravi; David Sidransky; Michael Keidar; Barry Trink Journal: Int J Mol Med Date: 2014-07-11 Impact factor: 4.101