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Assessment of methyl methacrylate genotoxicity by the micronucleus test
Araújo, Amarildo Mariano de; Alves, Guilherme Rodrigues; Avanço, Guilherme Trevisan; Parizi, José Luiz Santos; Nai, Gisele Alborghetti.
  • Araújo, Amarildo Mariano de; Univ do Oeste Paulista. Presidente Prudente. BR
  • Alves, Guilherme Rodrigues; Univ do Oeste Paulista. Presidente Prudente. BR
  • Avanço, Guilherme Trevisan; Univ do Oeste Paulista. Presidente Prudente. BR
  • Parizi, José Luiz Santos; Univ do Oeste Paulista. Presidente Prudente. BR
  • Nai, Gisele Alborghetti; Univ do Oeste Paulista. Presidente Prudente. BR
Braz. oral res ; 27(1): 31-36, Jan.-Feb. 2013. ilus, tab
Article in English | LILACS | ID: lil-660448
ABSTRACT
The aim of this study was to evaluate the genotoxic potential of methyl methacrylate (MMA) vapor by simulating standard occupational exposure of 8 hours per day and using the micronucleus test. We used 32 adult male Wistar rats divided into three groups A - 16 rats exposed to MMA for 8 hours a day, B - Eight rats receiving single subcutaneous doses of cyclophosphamide on the first day of the experiment (positive control), C - Eight rats receiving only water and food ad libitum (negative control). Eight rats from group A and all of the rats from groups B and C were sacrificed 24 hours after beginning the experiment (acute exposure in group A). The remaining animals in group A were sacrificed 5 days after the experiment began (repeated exposure assessment in group A, simulating occupational exposure 40 hours/week). Femoral bone marrow was collected from each rat at the time of sacrifice for use in the micronucleus test. Two slides were completed per animal and were stained with Giemsa staining. Two thousand polychromatic erythrocytes were counted per animal. The Kruskal-Wallis test followed by a multiple comparisons test (Dunn test) was used for statistical analysis. The median number of micronuclei was 7.00 in the group exposed to MMA for 1 day, 2.00 in the group exposed to MMA for 5 days, 9.00 in the group exposed to cyclophosphamide (positive control) and 0.756 in the negative control group (p < 0.0001). MMA was genotoxic when measured after 1 day of exposure but was not evidently genotoxic after 5 days.
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Full text: Available Index: LILACS (Americas) Main subject: Methylmethacrylate / Dental Cements Type of study: Evaluation studies Limits: Animals Language: English Journal: Braz. oral res Journal subject: Dentistry Year: 2013 Type: Article Affiliation country: Brazil Institution/Affiliation country: Univ do Oeste Paulista/BR

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Full text: Available Index: LILACS (Americas) Main subject: Methylmethacrylate / Dental Cements Type of study: Evaluation studies Limits: Animals Language: English Journal: Braz. oral res Journal subject: Dentistry Year: 2013 Type: Article Affiliation country: Brazil Institution/Affiliation country: Univ do Oeste Paulista/BR