Physical properties of novel composite using Portland cement for retro-filling material

Abstract

Objectives:The aim of this study was to compare apical sealing ability and physical properties of MTA, MTA -AH-plus mixture (AMTA) and experimental Portland cement -Epoxy resin mixture (EPPC) for a development of a novel retro-filling material. Materials and Methods: Forty-nine extracted roots were instrumented and filled with gutta-percha. Apical root was resected at 3 mm and the retro-filling cavity was prepared for 3 mm depth. Roots were randomly divided into 3 groups of 15 roots each. The retro-filling was done using MTA, AMTA, and EPPC as the groups divided. Four roots were used as control groups. After setting in humid condition for 24 hours, the roots were immersed in 1% methylene blue dye solution for 72 hours to test the apical leakage. After immersion, the roots were vertically sectioned and photos were taken to evaluate microleakage. Setting times were measured with Vicat apparatus and digital radiographs were taken to evaluate aluminum equivalent thickness using aluminum step wedge. The results of microleakage and setting time were compared between groups using one-way ANOVA and Scheffe' s post-hoc comparison at the significance level of 95%. Results: AMTA and EPPC showed less microleakage than MTA group (p < 0.05). AMTA showed the highest radio-opacity than other groups and the novel EPPC showed 5 mm aluminum thickness radio-opacity. EPPC showed the shortest initial and final setting times than other groups while the MTA showed the longest (p < 0.05). Conclusions: Under the condition of this study, the novel composite using Portland cement-Epoxy resin mixture may useful for retro-filling with the properties of favorable leakage resistance, radio-opacity and short setting time.

Biological Effects and Washout Resistance of a Newly Developed Fast-setting Pozzolan Cement

“…In this respect, a short setting time in addition to biocompatibility and sealing ability is necessary for an ideal root-end filling material (17,24). The development of fast-setting MTA has been attempted by many researchers (14)(15)(16)(17)24). However, most of these approaches were based on the addition of chemical setting accelerators, some of which showed adverse physical and biological effects (1,15,16).…”

“…Furthermore, Kim et al (22) reported that MTA failed to set in the presence of FBS. There also have been reports that the washout of MTA can occur when MTA is used as a retrograde filling material (13,14,22). Initial looseness of MTA, ie, it is not set or weakened physical condition, occurs in the presence of tissue fluid or blood flow and may threaten the hermetic sealing of communicating channels between the root canal system and the periradicular tissues, thereby resulting in the failure of endodontic surgery.…”

“…Kim et al (13) reported that washout of MTA could be mediated by continuous exudates or tissue fluid. Although MTA has excellent sealing ability, its washout can prevent the complete sealing of the retrograde preparation site of the tooth and thus eventually cause failure (13,14).…”

Evaluation of Setting Time, Solubility, and Compressive Strength of Four Calcium Silicate-Based Cements

“…While some studies suggest that longer setting times might result in increased material strength and reduced solubility, prolonging the setting time for pulp capping materials may have negative consequences, such as increased chair time, patient discomfort, and higher risks of material displacement or contamination before the material has fully set [5,[39][40][41][42][43]. Notably, the chair time is an important factor for children undergoing dental treatment owing to their specific characteristics, such as shorter attention spans and a tendency to become anxious or restless.…”