Influence of apical patency and filling material on healing process of dogs' teeth with vital pulp after root canal therapy

Abstract

The purpose of this study was to investigate the periapical healing process of dogs' teeth with or without apical patency and after root canal filling with two types of sealers. Forty roots of premolars and incisors were utilized. The root canals were over-instrumented and dressed with a corticosteroid-antibiotic solution for 7 days to obtain ingrowth of periapical connective tissue into the canals. After this period, the tissue was removed in half of the specimens (groups with patency) and preserved in the other half (groups without patency). Canals were filled by lateral condensation technique with gutta-percha points and either a calcium hydroxide-based sealer (Sealer Plus) or a Grossman's cement (Fill Canal). The animals were killed by anesthetic overdose 60 days after the endodontic treatment and anatomic pieces were obtained and prepared for histologic examination. Data were evaluated in a blind analysis on the basis of several histomorphologic parameters. The groups without patency had better results (p=0.01) than those in which the ingrown connective tissue was removed. Comparing the sealers, Sealer Plus had significantly better results (p=0.01) than Fill Canal. In conclusion, both the apical patency (presence or absence) and the type of root canal filling material influenced the periapical healing process in dogs' teeth with vital pulp after root canal treatment. The use of a calcium hydroxide-based sealer in teeth without apical patency yielded the best results among the experimental conditions proposed.

Establishing Apical Patency: To be or not to be?

“…Dandakis et al 25 also have observed that an apical plug provides effective sealing and prevents dye penetration when cold lateral condensation obturation is used. Using patency files and calcium hydroxide-based sealers, Holland et al 26 tried to induce biological apical closure. According to their findings, biological apical closure was achieved with deposition of cementum.…”

Pharmacological Evaluation of Propolis Solutions for Endodontic Use

“…Seltzer et al (1968) noted that success in treating inflamed apical and periapical tissues is crucial to maintaining their vitality. Holland et al (2005) demonstrated that periapical connective tissues heal after control of the inflammatory reactions resulting from post-overextended instrumentation trauma.…”

Comparação entre sessão única e a utilização do "curativo de demora" no tratamento endodôntico em cães: aspectos histopatológicos e microbiológicos

“…Com relação à Endodontia, muitas pesquisas são realizadas na tentativa de se encontrar um protocolo ideal, onde se possa eliminar os "contaminantes" do canal radicular, que estão diretamente relacionados ao sucesso do tratamento (Holland et al 2005).…”