Reação do tecido subcutâneo de rato à implantação do MTA branco e Ultrapex com e sem própolis / Reaction of connective tissues rats to implantation of white MTA and Ultrapex with or without propolis

O objetivo deste estudo foi comparar a reação do tecido subcutâneo de rato, frente a implantação de MTA branco-Angelus® e Ultrapex® com e sem própolis. Tubos de polietileno, preenchidos com MTA branco, MTA branco+própolis, Ultrap ex® e Ultrapex®+própolis foram implantados em tecido subcutâneo de 21 ratos Wistar (Rattus norvegicus). Os animais foram mortos aos 30, 45 e 60 dias. O tecido contendo o implante foi removido e processado histologicamente.Cortes seriados de 5μm foram corados pela hematoxilina e eosina em que se avaliou a intensidade do infiltrado inflamatório, característica da cápsula fibrosa e dispersão do material. A esses dados foi aplicado o teste do Qui-quadrado o qual se observou diferença estatisticamente significante entre os quatro materiais experimentais. O MTA branco+própolis foi o que apresentou uma menor reação tecidual, seguido do MTA branco, Ultrapex®+própolis e Ultrapex®. A adição da própolis melhorou o comportamento biológico dos materiais em teste

The aims of this study was to compare the reaction of white MTA-Angelus® and Ultrapex® with and without propolis. Polyethylene tubes filled with white MTA, white MTA+propolis, Ultrapex, Ultrapex®+propolis were implanted in subcutaneous tissue of 21 Wistar rats (Rattus norvegicus). The animals were killed at 30, 45 and 60 days. The tissue containing the implant was removed and processed histologically. Serial sections of 5μm were stained with hematoxylin and eosin. They were evaluated the inflammatory infiltrate, and characteristic of fibrous capsule anddispersal of the material. The data was applied to the Chi-square where there was a statistically significant difference among the four experimental materials. White MTA + propolis showed a more favorable tissue reaction, followed by white MTA, Ultrapex® + propolis and Ultrapex®. The propolis has improved the biological behavior of materials under test

The influence of calcium chloride on the setting time, solubility, disintegration, and pH of mineral trioxide aggregate and white Portland cement with a radiopacifier.

This study evaluated the influence of addition of 10% calcium chloride (CaCl(2)) on the setting time, solubility, disintegration, and pH of white MTA (WMTA) and white Portland cement (WPC). A test of the setting time was performed following the #57 ADA specifications and a test of the final setting time according to the ASTM. For the solubility tests disintegration and pH, Teflon rings were filled with the cements and weighed after setting. After 24 h in a desiccator, they were once again weighed. Thereafter, they were immersed in MiliQ water for 24 and 72 h and 7, 14, and 28 days, with maintenance in the desiccator and weighing between periods. The pH of water in which the rings were immersed was measured immediately after contact with them and in the other periods. The addition of CaCl(2) provided a significant reduction (50%) in the initial setting time of cements. The final setting time of WMTA was reduced in 35.5% and the final setting time of WPC in 68.5%. The WMTA with CaCl(2) absorbed water and gained weight with time, except for in the 24-h period. The addition of CaCl(2) to the WPC reduced its solubility. The addition of CaCl(2) increased the pH of WMTA in the immediate period and at 24 and 72 h and for WPC in the immediate period and at 24 h. The addition of CaCl(2) to WMTA and WPC reduced the setting times and solubility of both and increased the pH of cements in the initial periods.

Mineral Trioxide Aggregate with or without Calcium Chloride in Pulpotomy.

The aim of this study was to evaluate the reaction of the pulp tissue against mineral trioxide aggregate (MTA) with or without 10% calcium chloride (CaCl(2)). Pulpotomies were performed in 4 canines and 8 premolars of two 8-month-old dogs. MTA with or without CaCl(2) was applied on the pulp tissue. The animals were killed after 90 days, and the specimens were processed for the microscopic analysis. Pulp tissue response was similar for MTA with and without CaCl(2). Pulp vitality was present in all specimens, along with pulp repair with formation of mineralized tissue bridging. The addition of CaCl(2) to MTA did not change its biologic properties in formation of mineralized barrier after pulpotomy.

Repair of large periapical radiolucent lesions of endodontic origin without surgical treatment.

The aim of this paper is to present two case reports of pulp necrosis and radiolucent periapical lesions, which were treated without surgical treatment. The first was a mandibular molar with periapical lesion of endodontic origin extending towards the furcation in a 20-year-old woman, and the second affected a maxillary right lateral incisor with a large periapical lesion in a 22-year-old woman. The endodontic treatments were carried out in two sessions, with crown-down instrumentation, irrigation with 2.5% sodium hypochlorite and intracanal medication with calcium hydroxide paste. After 30 days, the root canals were filled with gutta-percha and Sealapex sealer by the lateral condensation technique. The clinical and radiographic examination after 1 year revealed complete repair. The appropriate diagnosis of lesions of endodontic origin and the treatment and obturation of the infected canals allowed complete repair of these large radiolucent periapical lesions without surgical treatment.

Sealing ability of MTA and radiopaque Portland cement with or without calcium chloride for root-end filling.

The aim of this study was to evaluate the influence of calcium chloride (CaCl(2)) on the sealing ability of three Mineral Trioxide Aggregate (MTA) cements, ProRoot MTA, MTA-Angelus, and radiopaque White Portland cement (WPC), for retrograde root filling. Seventy roots of extracted single-rooted teeth were instrumented and obturated. After sectioning the samples at 2 mm from the apex, they received one layer of Araldite and two coats of nail enamel, except for the apical dentinal surface submitted to apicectomy. Standardized retrograde cavities were prepared, filled with one of the materials, and immersed in 0.2% Rhodamine B solution for 72 hours. Dye leakage was analyzed on a light microscope with ocular micrometer. Kruskal-Wallis and Miller tests were used to compare groups arranged in increasing order of leakage, according to mean rank of scores: WPC+CaCl(2), MTA-Angelus+CaCl(2), ProRoot MTA+CaCl(2), MTA-Angelus, ProRoot MTA, and WPC. CaCl(2) improved the sealing ability of all three MTA cements.

Tratamiento de una perforación radicular con trióxido mineral agregado CPM / Treatment of a root perforation with mineral trioxide aggregate, CPM

Se presenta un caso de un paciente masculino de 29 años de edad, quien concurrió a la Clínica de Endodoncia, Facultad de Odontología, Baurú, Brasil, para efectuarse un retratamiento endodóntico del incisivo lateral superior izquierdo. Por medio de la evaluación clínica y radiográfica se diagnosticó una perforación radicular lateral a nivel cervical. Radiográficamente, el diente presentaba un perno, tratamiento del conducto radicular con lesión periapical crónica, una perforación lateral con sobreobturación de gutapercha a nivel cervical lateral de la raíz. El tratamiento consistió en la remoción de la gutapercha, retratamiento del conducto radicular y el sellado de la perforación radicular con trióxido mineral agregado (CPM). A los 12 meses la pieza dentaria retornó asintomática y radiográficamente con reparación de los tejidos periodontales en el lugar de la perforación y en la región periapical

Tratamiento de una perforación radicular con trióxido mineral agregado CPM / Treatment of a root perforation with mineral trioxide aggregate, CPM

Se presenta un caso de un paciente masculino de 29 años de edad, quien concurrió a la Clínica de Endodoncia, Facultad de Odontología, Baurú, Brasil, para efectuarse un retratamiento endodóntico del incisivo lateral superior izquierdo. Por medio de la evaluación clínica y radiográfica se diagnosticó una perforación radicular lateral a nivel cervical. Radiográficamente, el diente presentaba un perno, tratamiento del conducto radicular con lesión periapical crónica, una perforación lateral con sobreobturación de gutapercha a nivel cervical lateral de la raíz. El tratamiento consistió en la remoción de la gutapercha, retratamiento del conducto radicular y el sellado de la perforación radicular con trióxido mineral agregado (CPM). A los 12 meses la pieza dentaria retornó asintomática y radiográficamente con reparación de los tejidos periodontales en el lugar de la perforación y en la región periapical (AU)

Tratamiento de una perforación radicular con trióxido mineral agregado CPM / Treatment of a root perforation with mineral trioxide aggregate, CPM

Se presenta un caso de un paciente masculino de 29 años de edad, quien concurrió a la Clínica de Endodoncia, Facultad de Odontología, Baurú, Brasil, para efectuarse un retratamiento endodóntico del incisivo lateral superior izquierdo. Por medio de la evaluación clínica y radiográfica se diagnosticó una perforación radicular lateral a nivel cervical. Radiográficamente, el diente presentaba un perno, tratamiento del conducto radicular con lesión periapical crónica, una perforación lateral con sobreobturación de gutapercha a nivel cervical lateral de la raíz. El tratamiento consistió en la remoción de la gutapercha, retratamiento del conducto radicular y el sellado de la perforación radicular con trióxido mineral agregado (CPM). A los 12 meses la pieza dentaria retornó asintomática y radiográficamente con reparación de los tejidos periodontales en el lugar de la perforación y en la región periapical (AU)