Aim. To evaluate the efficacy of PVP 2%, 5% or 10% over removal stain on HA. Methods. HA was stained in a tube by a Lipton Black Tea solution stirred. Stained HA was filtered, washed and dried. The stained HA powder was used for the test after two weeks. It was divided in 4 tubes to undergo different treatments: control: the tube was filled with water; test 2%: with a solution PVP 2%; test 5%: with a solution PVP 5%; test 10%: with a solution PVP 10%. All tubes were stirred for 5 minutes. HAs were filtered, washed and then dried. The HAs (test 2%, 5%, 10% and control) were imaged in the same picture and processed with Adobe Photoshop to calculate L*a*b* and ΔE*ab. Results. The stained HA treated with 2%, 5% or 10% PVP or control to remove stains gave the following colour parameters: water treated HA L 65 a 21 b 23, PVP 2% treated HA L 65 a 20 b 24, PVP 5% treated HA L 67 a 21 b 23, PVP 10% treated HA L 67 a 20 b 21; ΔE*ab were respectively 1.4, 2.2 and 3.5 for 2%, 5% and PVP 10% compared to control. Discussion: ΔL (luminance, strictly linked to white intensity) compared to control suggests that solutions 5% or 10% PVP are capable to remove stains from HA but this effect is not clearly visible by not expert eye. L for stained HA treated with PVP 2% is not different from control. There is no considerable difference between the solution 5% and 10%. Conclusions. results suggest that 5% and 10% PVP solutions are capable to reduce staining.
Porciani, ., M., M., G., F., Grandini, S. (2011). Removing action on hydroxyapatite (HA) stains by polyvinylpyrrolidone (PVP) at different concentrations in vitro. In Atti del Congresso del collegio dei docenti di discipline odontostomatologiche. Siena-Firenze 14-16 Aprile 2011.
Removing action on hydroxyapatite (HA) stains by polyvinylpyrrolidone (PVP) at different concentrations in vitro
GRANDINI, SIMONE
2011-01-01
Abstract
Aim. To evaluate the efficacy of PVP 2%, 5% or 10% over removal stain on HA. Methods. HA was stained in a tube by a Lipton Black Tea solution stirred. Stained HA was filtered, washed and dried. The stained HA powder was used for the test after two weeks. It was divided in 4 tubes to undergo different treatments: control: the tube was filled with water; test 2%: with a solution PVP 2%; test 5%: with a solution PVP 5%; test 10%: with a solution PVP 10%. All tubes were stirred for 5 minutes. HAs were filtered, washed and then dried. The HAs (test 2%, 5%, 10% and control) were imaged in the same picture and processed with Adobe Photoshop to calculate L*a*b* and ΔE*ab. Results. The stained HA treated with 2%, 5% or 10% PVP or control to remove stains gave the following colour parameters: water treated HA L 65 a 21 b 23, PVP 2% treated HA L 65 a 20 b 24, PVP 5% treated HA L 67 a 21 b 23, PVP 10% treated HA L 67 a 20 b 21; ΔE*ab were respectively 1.4, 2.2 and 3.5 for 2%, 5% and PVP 10% compared to control. Discussion: ΔL (luminance, strictly linked to white intensity) compared to control suggests that solutions 5% or 10% PVP are capable to remove stains from HA but this effect is not clearly visible by not expert eye. L for stained HA treated with PVP 2% is not different from control. There is no considerable difference between the solution 5% and 10%. Conclusions. results suggest that 5% and 10% PVP solutions are capable to reduce staining.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
https://hdl.handle.net/11365/36946
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