Eficácia da associação de inibidores da bomba de prótons com pasta de hidróxido de cálcio como medicação intracanal em dentes de ratos com lesões periapicais

• Ano de defesa: 2011
• Autor(a) principal: Wagner, Cláudia
• Orientador(a): Campos, Maria Martha
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Pontifícia Universidade Católica do Rio Grande do Sul; Porto Alegre
• Palavras-chave em Português: ODONTOLOGIA; ENDODONTIA; HIDRÓXIDOS; LESÕES PERIAPICAIS; MEDICAMENTOS
• Link de acesso: http://hdl.handle.net/10923/502

Objectives: To evaluate the efficacy of the association of a proton pump inhibitor (omeprazole) with Ca(OH)2 as intracanal medication in a rat model of periapical lesions. Methods: Periapical lesions were induced on the first right mandibular molar of male Wistar rats (6 per group) and left open in the oral cavity for 28 days. After that period, the distal canal of each tooth was prepared, filled with the respective dressing (Negative Control - PEG 400; Positive Control - Ca(OH)2 + PEG400; Test - Ca(OH)2 + Omeprazole + PEG 400), and sealed with amalgam for 15 or 28 days. Microbiological samples were taken in three periods: S1 - after 28 days of lesion induction; S2 - after the biomechanical preparation; S3 - after the abovementioned medication periods (15 and 28 days). The animals were euthanized, and the teeth were processed for radiographic and histological analysis. Results: The radiographic and histological analysis revealed that both test and positive control groups had a reduction of periapical lesion areas, at 28 days, when compared to the negative control group. The reduction of periapical lesions and of inflammatory cells infiltration was significantly improved by associating omeprazole to Ca(OH)2, with a visible increase of reparative bone areas. The microbiological assessment showed a significant decrease of CFU counting from S1 to S2 or S3 collecting times, but no differences were observed between the S2 and the S3 time-periods, or among the experimental groups within the S3 period, either at 15 or 28 days of medication. However, further bacterial characterization showed a possible selective activity of the medications, despite the similar CFU count results. Conclusions: Our data showed that association of omeprazole to Ca(OH)2 favored a superior repair of periapical lesions in rats, and seems to display different selective activity over the endodontic microbiota, in comparison to the conventional Ca(OH)2 dressing.