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Impact of Experimental Nano-HAP Pastes on Bovine Enamel and Dentin Submitted to a pH Cycling Model
Brazilian Dental Journal; Comar, Livia P.; Souza, Beatriz M.; Gracindo, Luiz Fernando; Buzalaf, Marilia A. R.; Magalhaes, Ana Carolina.
  • Comar, Livia P.; USP - University of Sao Paulo. Bauru Dental School. Department of Biological Sciences. Bauru. BR
  • Souza, Beatriz M.; USP - University of Sao Paulo. Bauru Dental School. Department of Biological Sciences. Bauru. BR
  • Gracindo, Luiz Fernando; USP - University of Sao Paulo. Bauru Dental School. Department of Biological Sciences. Bauru. BR
  • Buzalaf, Marilia A. R.; USP - University of Sao Paulo. Bauru Dental School. Department of Biological Sciences. Bauru. BR
  • Magalhaes, Ana Carolina; USP - University of Sao Paulo. Bauru Dental School. Department of Biological Sciences. Bauru. BR
Braz. dent. j ; 24(3): 273-278, May-Jun/2013. tab
Article in English | LILACS | ID: lil-681878
ABSTRACT
This in vitro study evaluated the preventive potential of experimental pastes containing 10% and 20% hydroxyapatite nanoparticles (Nano-HAP), with or without fluoride, on dental demineralization. Bovine enamel (n=15) and root dentin (n=15) specimens were divided into 9 groups according to their surface hardness control (without treatment), 20 Nanop paste (20% HAP), 20 Nanop paste plus (20% HAP + 0.2% NaF), 10 Nanop paste (10% HAP), 10 Nanop paste plus (10% HAP + 0.2% NaF), placebo paste (without fluoride and HAP), fluoride paste (0.2% NaF), MI paste (CPP-ACP, casein phosphopeptide-amorphous calcium phosphate), and MI paste plus (CPP-ACP + 0.2% NaF). Both MI pastes were included as commercial control products containing calcium phosphate. The specimens were treated with the pastes twice a day (1 min), before and after demineralization. The specimens were subjected to a pH-cycling model (demineralization–6-8 h/ remineralization-16-18 h a day) for 7 days. The dental subsurface demineralization was analyzed using cross-sectional hardness (kgf/mm 2 , depth 10-220 µm). Data were tested using repeated-measures two-way ANOVA and Bonferroni's test (p<0.05). The only treatment able to reduce the loss of enamel and dentin subsurface hardness was fluoride paste (0.2% NaF), which differed significantly from the control at 30- and 50-µm depth (p<0.0001). The other treatments were not different from each other or compared with the control. The experimental Nanop pastes, regardless of the addition of fluoride, were unable to reduce dental demineralization in vitro.
RESUMO
Este estudo in vitro avaliou o potencial de pastas experimentais contendo nanopartículas de hidroxiapatita a 10% e 20% (Nano-HAP), com ou sem fluoreto, na prevenção da desmineralização dentária. Espécimes de esmalte (n=15) e de dentina radicular (n=15) bovinos foram divididos em nove grupos de acordo com o valor de dureza superficial controle (sem tratamento), pasta Nanop 20 (HAP 20%), pasta Nanop 20 plus (HAP 20% + NaF 0,2%), pasta Nanop 10 (HAP 10%), pasta Nanop 10 plus (HAP 10% + NaF 0,2%), pasta placebo (sem F e HAP), pasta fluoretada (NaF 0,2%), pasta MI (CPP-ACP, fosfopeptídio da caseína-fosfato de cálcio amorfo), e pasta MI plus (CPP-ACP + NaF 0,2%). As duas pastas MI foram inclusas como grupos controles comerciais contendo fosfato de cálcio. Os espécimes foram tratados com as pastas duas vezes ao dia (1 min), antes e após a desmineralização. Os espécimes foram submetidos a um modelo de ciclagem de pH (desmineralização 6-8 h/ remineralização 16-18 h por dia) durante sete dias. A desmineralização dentária de subsuperfície foi avaliada através da dureza longitudinal (kgf/mm 2 , profundidade de 10-220 µm). Os dados foram analisados utilizando ANOVA a dois critérios e teste de Bonferroni (p<0,05). O único tratamento capaz de reduzir a perda da dureza de subsuperfície do esmalte e da dentina foi a pasta fluoretada (NaF 0,2%), a qual diferiu significativamente do controle nas profundidades de 30 e 50 µm da superfície (p<0,0001). Os outros tratamentos não foram diferentes entre si ou quando comparados ao controle. As pastas experimentais Nanop, independentemente da presença de fluoreto, não foram capazes de reduzir a desmineralização dentária in vitro.
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Full text: Available Index: LILACS (Americas) Main subject: Toothpastes / Tooth Demineralization / Durapatite / Dental Enamel / Dentin / Nanoparticles Type of study: Prognostic study Limits: Animals Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2013 Type: Article / Project document Affiliation country: Brazil Institution/Affiliation country: USP - University of Sao Paulo/BR

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Full text: Available Index: LILACS (Americas) Main subject: Toothpastes / Tooth Demineralization / Durapatite / Dental Enamel / Dentin / Nanoparticles Type of study: Prognostic study Limits: Animals Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2013 Type: Article / Project document Affiliation country: Brazil Institution/Affiliation country: USP - University of Sao Paulo/BR