Monteiro Bramante Clóvis, Demarchi Ana Claudia Cardoso Oliveira, de Moraes Ivaldo Gomes, Bernadineli Norberti, Garcia Roberto Brandão, Spångberg Lars S W, Duarte Marco Antonio Hungaro
Department of Operative Dentistry, Dental School of Bauru, University of São Paulo, Bauru, SP, Brazil.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2008 Dec;106(6):909-13. doi: 10.1016/j.tripleo.2008.07.018. Epub 2008 Oct 4.
The presence of arsenic in various types of mineral trioxide aggregate (MTA) and Portland cements were evaluated to verify if they comply with the ISO-recommended limit for water-based cements of 2 mg arsenic/kg material.
An amount of 5 mL of hydrochloric acid was added to 2 g each of MTA and Portland cement to be analyzed. After 15 minutes, the material was filtered and the volume of supernatant was diluted with reagent-grade water up to 40 mL. Atomic absorption spectrophotometry readings were performed in triplicate.
The following mean values were obtained: CPM (Egeo, Buenos Aires, Argentina) 11.06 mg/kg; CPM sealer (Egeo) 10.30 mg/kg; MTA-Obtura (Angelus, Londrina, PR, Brazil) 0.39 mg/kg; Experimental MTA: 10.30 mg/kg; White MTA-Angelus (Angelus) 1.03 mg/kg; Gray MTA-Angelus (Angelus) 5.91 mg/kg; ProRoot-MTA (Dentsply/Tulsa Dental Specialties, Tulsa, OK) 5.25 mg/kg; Gray Portland cement (Votorantim Cimentos, Cubatão, SP, Brazil): 34.27 mg/kg; and White Portland cement (Cimento Rio Branco, Rio de Janeiro, RJ, Brazil) 0.52 mg/kg.
All tested materials presented arsenic in their composition. The form of arsenic was not analyzed nor the toxicity of the arsenic found. Only MTA-Obtura, White MTA-Angelus, and White Portland cement presented arsenic levels below the limit set in the ISO 9917-1 standard.
评估不同类型的三氧化矿物凝聚体（MTA）和波特兰水泥中砷的含量，以验证它们是否符合ISO推荐的水基水泥中砷含量上限2毫克/千克材料的标准。
向2克待分析的MTA和波特兰水泥中各加入5毫升盐酸。15分钟后，对材料进行过滤，并用试剂级水将上清液体积稀释至40毫升。采用原子吸收分光光度法进行三次读数。
获得以下平均值：CPM（阿根廷布宜诺斯艾利斯Egeo公司）11.06毫克/千克；CPM封闭剂（Egeo公司）10.30毫克/千克；MTA-Obtura（巴西隆德里纳Angelus公司）0.39毫克/千克；实验性MTA：10.30毫克/千克；白色MTA-Angelus（Angelus公司）1.03毫克/千克；灰色MTA-Angelus（Angelus公司）5.91毫克/千克；ProRoot-MTA（美国俄克拉何马州塔尔萨市Dentsply/Tulsa Dental Specialties公司）5.25毫克/千克；灰色波特兰水泥（巴西圣保罗州库巴唐Votorantim Cimentos公司）：34.27毫克/千克；白色波特兰水泥（巴西里约热内卢Cimento Rio Branco公司）0.52毫克/千克。
所有测试材料的成分中均含有砷。未对砷的形态进行分析，也未分析所发现砷的毒性。只有MTA-Obtura、白色MTA-Angelus和白色波特兰水泥的砷含量低于ISO 9917-1标准规定的限值。
