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Apatite formation on dental ceramics modified by a bioactive glass
Author(s) -
Kontonasaki E.,
Papadopoulou L.,
Zorba T.,
Pavlidou E.,
Paraskevopoulos K.,
Koidis P.
Publication year - 2003
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.2003.01072.x
Subject(s) - simulated body fluid , apatite , bioactive glass , materials science , ceramic , scanning electron microscope , fourier transform infrared spectroscopy , dental ceramics , composite material , energy dispersive x ray spectroscopy , glass ceramic , immersion (mathematics) , coating , mineralogy , chemical engineering , chemistry , cubic zirconia , mathematics , pure mathematics , engineering
Summary Restorative dental materials are considered biocompatible without exhibiting any bioactive behaviour. The aim of this study was the investigation of surface structure changes on conventional dental ceramics used in metal‐ceramic restorations modified by a bioactive glass, after immersion in SBF for various time periods. Bioactive glass powder was mixed with porcelain powder with three different weight ratios: 1:1, 1:2, and 2:1. The two powders were mixed with porcelain modelling liquid and the mixture was transferred and spread on the surface of pre‐fabricated ceramic disks. Coated ceramic specimens after being exposed to a specific thermal cycle as it is recommended for dental ceramics were soaked in Simulated Body Fluid (SBF) at 37 °C for various periods of time. After soaking, specimens were studied using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). Results revealed the development of a non‐stoichiometric, biological apatite layer on their surface after exposure in SBF for several time periods. The onset of apatite‐layer formation is directly dependent on the amount of bioglass in the coating and its thickness reduces within the specimens of the same bioactive glass–porcelain proportion with time, reaching an average thickness of 15 μm at the longest immersion time, for all the specimens.