title: Preparation and characterization of new dental porcelains, using K-feldspar and quartz raw materials. Effect of B2O3 additions on sintering and mechanical properties.
abstract: The aim of this work was to determine the effect of temperature and boric oxide (B2O3) addition on sintering and mechanical properties of a newly developed dental porcelain (DP) prepared from local Algerian raw materials. Based on a preliminary work, the new selected composition was 75wt.% feldspar, 20wt.% quartz and 5wt.% kaolin. It was prepared by sintering the mixture at different temperatures (1100-1250°C). The optimum sintering conditions gave a relatively higher density (2.47g/cm(3)) and excellent mechanical properties. The three point flexural strength (3PFS) and Martens micro-hardness of dental porcelains were 149MPa and 2600MPa, respectively. This obtained 3PFS value is more than four times greater than that of hydroxyapatite (HA) value (about 37MPa) sintered under the same conditions. However, the sintering temperature was lowered by about 25 and 50°C for 3 and 5wt.% B2O3 additions, respectively. But, it did not improve furthermore the samples density and their mechanical properties. It has also been found that B2O3 additions provoke a glass matrix composition variation which delays the leucite formation during sintering.
authors.affiliation: Faculty of Exact Sciences, Physics Department, Ceramics Lab., Mentouri University of Constantine, Constantine 25000, Algeria. Electronic address: harabi52@gmail.com.
authors.forename: Abdelhamid
authors.initials: A
authors.lastname: Harabi
authors.affiliation: Faculty of Exact Sciences, Physics Department, Ceramics Lab., Mentouri University of Constantine, Constantine 25000, Algeria; Faculty of Science, Matter Sciences Department, El-Hadj-Lakhdar University of Batna, Batna 05000, Algeria. Electronic address: guerfatiha@yahoo.fr.
authors.forename: Fatiha
authors.initials: F
authors.lastname: Guerfa
authors.affiliation: Faculty of Exact Sciences, Physics Department, Ceramics Lab., Mentouri University of Constantine, Constantine 25000, Algeria.
authors.forename: Esma
authors.initials: E
authors.lastname: Harabi
authors.affiliation: Faculty of Exact Sciences, Physics Department, Ceramics Lab., Mentouri University of Constantine, Constantine 25000, Algeria.
authors.forename: Mohamed-Tayeb
authors.initials: MT
authors.lastname: Benhassine
authors.affiliation: Faculty of Exact Sciences, Physics Department, Ceramics Lab., Mentouri University of Constantine, Constantine 25000, Algeria.
authors.forename: Lazhar
authors.initials: L
authors.lastname: Foughali
authors.affiliation: Faculty of Exact Sciences, Physics Department, Ceramics Lab., Mentouri University of Constantine, Constantine 25000, Algeria.
authors.forename: Soumia
authors.initials: S
authors.lastname: Zaiou
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry*; D001896:Boron Compounds / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D003776:Dental Porcelain / Q000737:chemistry*; D006244:Hardness; D008855:Microscopy, Electron, Scanning; D017680:Potassium Compounds / Q000737:chemistry*; D011791:Quartz / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013718:Tensile Strength; D014961:X-Ray Diffraction
chemical_list: D000538:Aluminum Silicates; D001896:Boron Compounds; D017680:Potassium Compounds; D003776:Dental Porcelain; C016447:feldspar; D011791:Quartz; C042168:boron oxide
keywords: B(2)O(3) additions; Dental porcelain; Flexural strength; Martens micro-hardness; Sintering