Abstract
Root perforation represents an undesirable complication that may lead to an unfavorable prognosis. The aims of this study were to characterize and to compare the presence of calcium oxide (CaO) on the chemical composition of materials used for root perforation therapy: gray and white mineral trioxide aggregate (MTA) and Portland cement (PC), gray MTA+5%CaO and gray MTA+10%CaO. The last two materials were analyzed to evaluate the increase of CaO in the final sample. CaO alone was used as a standard. Eighteen polyethylene tubes with an internal diameter of 3 mm and 3 mm in length were prepared, filled and then transferred to a chamber with 95% relative humidity and a temperature of 37ºC. The chemical compounds (particularly CaO) and the main components were analyzed by energy-dispersive X-ray microanalysis (EDX). EDX revealed the following concentrations of CaO: gray MTA: 59.28%, white MTA: 63.09%; PC: 72.51%; gray MTA+5%CaO: 63.48% and gray MTA+10%CaO: 67.55%. The tested materials presented different concentrations of CaO. Even with an increase of 5 and 10% CaO in gray MTA, the CaO levels found in the MTA samples were lower than those found in PC.
Highlights
Root canal perforation is a pathological or technical accident that results in an artificial communication between the pulp cavity and the periodontal tissues, capable of affecting the prognosis of endodontic treatment
In a well-known study [3], calcium hydroxide (CH) and mineral trioxide aggregate (MTA) were inserted into dentin cylinders, implanted in the subcutaneous tissue of rats and analyzed by polarized light and Von Kossa staining for calcium salts
The materials used in this study were distributed in the following groups: Gray MTA-Angelus® (GMTA; Angelus, Londrina, PR, Brazil); White MTA-Angelus® (WMTA; Angelus, Londrina, PR, Brazil); Portland cement (PC; CP II-F-32; Cia. de Cimento Itaú, Itaú de Minas, MG, Brazil); Gray MTA-Angelus® (Angelus) with addition of 5% calcium oxide (CaO)
Summary
Root canal perforation is a pathological or technical accident that results in an artificial communication between the pulp cavity and the periodontal tissues, capable of affecting the prognosis of endodontic treatment. The capacity of MTA to properly seal communications between the tooth and the external surfaces has been demonstrated [5,6]. This material has been evaluated in a series of in vivo and in vitro investigations that reported good sealing ability and tissue behavior [5,6,7]. CH showed formation of calcite granulations birefringent to the polarized light near the tube lumen. Under these granulations, a Von Kossa positive bridge of hard tissue was formed. It has been shown that Portland cement (PC) contains the same main chemical elements
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