Production and characterization of feldspathic-muscovite glass composite for dental prosthesis
Abstract The principal objective of this studywas to produce and characterize a machinable glass ceramic containing muscovite-mica as the main crystalline phase to be used as a dental restorative material. The secondary objective was to evaluate the use of muscovite-mica to improve machinability and...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Sociedade Brasileira de Pesquisa Odontológica
2025-08-01
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| Series: | Brazilian Oral Research |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-83242025000105100&lng=en&tlng=en |
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| Summary: | Abstract The principal objective of this studywas to produce and characterize a machinable glass ceramic containing muscovite-mica as the main crystalline phase to be used as a dental restorative material. The secondary objective was to evaluate the use of muscovite-mica to improve machinability and generate a toughening mechanism in the experimental glass ceramic. After fine milling of a feldspathic glass frit was milled and then mixed with muscovite-mica, die-pressed, and sintered under vacuum at 850 to 1,150 °C. The resulting sintered composite was characterized by X-ray diffraction, scanning electron microscopy, and had its fracture toughness evaluated by micro-indentation. The results were as follows: (a) improved thermal stability of muscovite-mica crystals in the composite; (b) improved leucite crystallization in the feldspathic glass matrix by increasing sintering temperature in the studied range ; (c) the composites consisting of glass + 10% muscovite and glass + 20% muscovite sintered at 1,050°C presented fracture toughness values of 9.0 ± 1.2 and 8.4 ± 0.6 MPa.m1/2, respectively, which are higher than those found in the literature for glass ceramics. Feldspar frit blocks with addition of muscovite-mica (up to 20%) can be densified at temperatures between 1,050 and 1,150°C. This material was stable at a temperature substantially higher than the stability limit of pure muscovite and also showed indentation fracture toughness values greater than those reported in the literature for other glass ceramics. |
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| ISSN: | 1807-3107 |