The aim of this study was to determine the tensile strength of crowns cemented on metallic substrate with four different types of luting agents. Twenty human maxillary molars with similar diameters were selected and prepared to receive metallic core castings (Cu-Al). After cementation and preparation the cores were measured and the area of crown's portion was calculated. The teeth were divided ...

In the 1980s, a pilot study conducted in Tanzania demonstrated a reduction in the need for tooth extraction after removal of soft demineralized dentin from dental cavities that were then filled with polycarboxylate cement [1]. Remarkably, only one of the twentyeight permanent teeth treated in this manner was extracted while the remainder was asymptomatic nine months after treatment [2]. This te...

INTRODUCTION The aim of this study was to evaluate the effects of eugenol-free temporary cement's remnants on the retentive strength of full metal crowns luted via zinc phosphate and resin cement (Maxcem) to the tooth structure. MATERIALS AND METHODS Forty complete standardized Ni-Cr crowns in four groups were cemented by two types of permanent cements: zinc phosphate cement and resin cement ...

AIM This study was undertaken to examine the effect of root canal (RT) sealers content and the cleaning procedure of RT walls on bond strength (BS) of a fiber reinforced composite (FRC) post cemented with resin-based or zinc phosphate cement. MATERIALS AND METHODS Forty bovine roots were divided into 2 groups (n = 20) and obturated with gutta-percha points plus Sealer 26 sealer or gutta-perch...

The effect of polycarboxylate superplasticizer on the fluidity and rheology cement - silica fume water paste was investigated. changes dispersion degree, yield stress plastic viscosity with different content were analyzed. results show that rheological properties conform to Herschel-Bulkley model. shear thinning slurry is manifested as a typical yielding pseudoplastic fluid characteristic. When...

AIM In an effort to control postoperative sensitivity, dentin sealers are being applied following crown preparations, with little knowledge of how crown retention might be affected. A previous study demonstrated no adverse effect when using a gluteraldehyde-based sealer, and existing studies have shown conflicting results for resin-based products. This study determined the retention of the cast...

The electrical properties of carbon nanotubes (CNT) cement-based composites have been modeled in previous works by circuit models or homogenization theories. An alternative approach is the use an effective medium theory with induced polarization: In this work, a new model based on generalized polarization (GEMTIP) cylindrical inclusions proposed. presented results and discussion show its applic...