The effect of the renewal of calcium hydroxide paste on the apexification and periapical healing of teeth with incomplete root formation
| Autor: | M. C. S. Felippe, Márcia Martins Marques, João Humberto Antoniazzi, W. T. Felippe |
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| Rok vydání: | 2005 |
| Předmět: |
Materials science
chemistry.chemical_element Dentistry Calcium Statistics Nonparametric Bone resorption Calcium Hydroxide Root Canal Filling Materials chemistry.chemical_compound Calcification Physiologic Dogs Tooth Apex stomatognathic system Premolar medicine Animals General Dentistry Inflammation Wound Healing Calcium hydroxide business.industry Periradicular medicine.anatomical_structure chemistry Sodium hypochlorite Pulp (tooth) Apexification business Extravasation of Diagnostic and Therapeutic Materials |
| Zdroj: | International Endodontic Journal. 38:436-442 |
| ISSN: | 1365-2591 0143-2885 |
| DOI: | 10.1111/j.1365-2591.2005.00959.x |
| Popis: | Aim To evaluate the influence of renewing calcium hydroxide paste on apexification and periapical healing of teeth in dogs with incomplete root formation and previously contaminated canals. Methodology Forty premolars from four 6-month-old dogs were used. After access to the root canals and complete removal of the pulp, the canal systems remained exposed to the oral environment for 2 weeks. Canal preparation was then carried out using Hedstroem files, under irrigation with 1% sodium hypochlorite, 1 mm short of the radiographic apex. After drying, the canals of one premolar in each dog were left empty (group 4-control), and those of the other nine teeth in each animal were filled with a calcium hydroxide-propylene glycol paste. All teeth were restored with reinforced zinc oxide cement (IRM) or IRM and amalgam (group 4). The paste was renewed and the teeth restored again 1 week later. Then, the nine teeth in each animal were divided into three experimental groups: group 1 – paste not changed; group 2 – paste renewed every 4 weeks for 5 months; and group 3 – paste renewed after 3 months had elapsed. The teeth were restored with IRM and amalgam (groups 1 and 3) or IRM (group 2). The animals were killed 5 months later, and blocks of the teeth and surrounding tissues were submitted to histological processing. The sections were studied to evaluate six parameters: apical calcified tissue barrier, inflammatory reaction, bone and root resorption, paste extrusion and microorganisms. Results of experimental groups were analysed by Kruskal–Wallis nonparametric tests and by the test of proportions. The critical value of statistical significance was 5%. Results Significant differences (P |
| Databáze: | OpenAIRE |
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