Spray mist reduction by means of a high-volume evacuation system-Results of an experimental study.

<h4>Objectives</h4>High-speed tooth preparation requires effective cooling to avoid thermal damage, which generates spray mist, which is a mixture of an aerosol, droplets and particles of different sizes. The aim of this experimental study was to analyze the efficacy of spray mist reduct...

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Autores principales:	Martin Koch, Christian Graetz
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/959095c226c0462080f71246fda3e675
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spelling	oai:doaj.org-article:959095c226c0462080f71246fda3e6752021-12-02T20:08:31ZSpray mist reduction by means of a high-volume evacuation system-Results of an experimental study.1932-620310.1371/journal.pone.0257137https://doaj.org/article/959095c226c0462080f71246fda3e6752021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0257137https://doaj.org/toc/1932-6203<h4>Objectives</h4>High-speed tooth preparation requires effective cooling to avoid thermal damage, which generates spray mist, which is a mixture of an aerosol, droplets and particles of different sizes. The aim of this experimental study was to analyze the efficacy of spray mist reduction with an intraoral high-volume evacuation system (HVE) during simulated high-speed tooth preparation for suboptimal versus optimal suction positions of 16 mm sized cannulas and different flow rates of the HVE.<h4>Material and methods</h4>In a manikin head, the upper first premolar was prepared with a dental turbine, and generated particles of 5-50 microns were analyzed fifty millimeters above the mouth opening with the shadow imaging technique (frame: 6.6×5.3×1.1 mm). This setup was chosen to generate a reproducible spray mist in a vertical direction towards an imaginary operator head (worst case scenario). The flow rate (FR) of the HVE was categorized into five levels (≤120 l/min up to 330 l/min). The number of particles per second (NP; p/s) was counted, and the mass volume flow of particles per second (MVF; μg/scm3) was calculated for 10 sec. Statistical tests were nonparametric and two-sided (p≤0.05).<h4>Results</h4>With increasing flow rate, the NP/MVF values decreased significantly (eta: 0.671/0.678; p≤0.001). Using a suboptimally positioned cannula with an FR≤160 l/min, significantly higher NP values (mean±SD) of 731.67±54.24 p/s (p≤0.019) and an MVF of 3.72±0.42 μg/scm3 (p≤0.010) were measured compared to those of the optimal cannula position and FR≥300 l/min (NP/MVF: 0/0). No significant difference in NP and MVF was measurable between FR≥250 l/min and FR>300 l/min (p = 0.652, p = 0.664).<h4>Conclusion</h4>Within the limitations of the current experimental study, intraoral high-flow rate suction with ≥300 l/min with an HVE effectively reduced 5-50 μm sized particles of the spray mist induced by high-speed tooth preparation with a dental turbine.Martin KochChristian GraetzPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 9, p e0257137 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Martin Koch Christian Graetz Spray mist reduction by means of a high-volume evacuation system-Results of an experimental study.
description	<h4>Objectives</h4>High-speed tooth preparation requires effective cooling to avoid thermal damage, which generates spray mist, which is a mixture of an aerosol, droplets and particles of different sizes. The aim of this experimental study was to analyze the efficacy of spray mist reduction with an intraoral high-volume evacuation system (HVE) during simulated high-speed tooth preparation for suboptimal versus optimal suction positions of 16 mm sized cannulas and different flow rates of the HVE.<h4>Material and methods</h4>In a manikin head, the upper first premolar was prepared with a dental turbine, and generated particles of 5-50 microns were analyzed fifty millimeters above the mouth opening with the shadow imaging technique (frame: 6.6×5.3×1.1 mm). This setup was chosen to generate a reproducible spray mist in a vertical direction towards an imaginary operator head (worst case scenario). The flow rate (FR) of the HVE was categorized into five levels (≤120 l/min up to 330 l/min). The number of particles per second (NP; p/s) was counted, and the mass volume flow of particles per second (MVF; μg/scm3) was calculated for 10 sec. Statistical tests were nonparametric and two-sided (p≤0.05).<h4>Results</h4>With increasing flow rate, the NP/MVF values decreased significantly (eta: 0.671/0.678; p≤0.001). Using a suboptimally positioned cannula with an FR≤160 l/min, significantly higher NP values (mean±SD) of 731.67±54.24 p/s (p≤0.019) and an MVF of 3.72±0.42 μg/scm3 (p≤0.010) were measured compared to those of the optimal cannula position and FR≥300 l/min (NP/MVF: 0/0). No significant difference in NP and MVF was measurable between FR≥250 l/min and FR>300 l/min (p = 0.652, p = 0.664).<h4>Conclusion</h4>Within the limitations of the current experimental study, intraoral high-flow rate suction with ≥300 l/min with an HVE effectively reduced 5-50 μm sized particles of the spray mist induced by high-speed tooth preparation with a dental turbine.
format	article
author	Martin Koch Christian Graetz
author_facet	Martin Koch Christian Graetz
author_sort	Martin Koch
title	Spray mist reduction by means of a high-volume evacuation system-Results of an experimental study.
title_short	Spray mist reduction by means of a high-volume evacuation system-Results of an experimental study.
title_full	Spray mist reduction by means of a high-volume evacuation system-Results of an experimental study.
title_fullStr	Spray mist reduction by means of a high-volume evacuation system-Results of an experimental study.
title_full_unstemmed	Spray mist reduction by means of a high-volume evacuation system-Results of an experimental study.
title_sort	spray mist reduction by means of a high-volume evacuation system-results of an experimental study.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/959095c226c0462080f71246fda3e675
work_keys_str_mv	AT martinkoch spraymistreductionbymeansofahighvolumeevacuationsystemresultsofanexperimentalstudy AT christiangraetz spraymistreductionbymeansofahighvolumeevacuationsystemresultsofanexperimentalstudy
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Spray mist reduction by means of a high-volume evacuation system-Results of an experimental study.

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