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Effects of Dispersion Toughening of ZrO2 and Al2O3 in the Bioglass-Ceramic CaO-MgO-SiO 2-P2O5-CaF2F2 System

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Abstract

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1. ¾Ë·ç¹Ì³ª¿Í ºÎºÐ¾ÈÁ¤È­ Áö¸£ÄڴϾÆÀÇ Ã·°¡·®¿¡ °ü°è¾øÀÌ Çü¼ºµÈ ÁÖ°áÁ¤»óÀº ¾ÆÆÄŸÀÌ
Æ®, ¿ù¶ó½ºÅ䳪ÀÌÆ® ¹× ¥â -TCP·Î ³ªÅ¸³µ´Ù.
2. 2Ãà±ÁÈû°­µµ¿Í Æı«ÀμºÄ¡´Â ¾Ë·ç¹Ì³ª¿Í Áö¸£ÄڴϾÆÀÇ Ã·°¡·Î¼­ °³¼±µÇ¾úÀ¸¸ç, ¾Ë·ç¹Ì
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3. À¯»çü¾× Áß¿¡¼­ÀÇ ÀλêÄ®½·ÀÇ ¼®Ãâ¾ç»óÀº ¾Ë·ç¹Ì³ªº¸´Ù Áö¸£ÄڴϾƸ¦ ÷°¡ÇÑ °æ¿ì¿¡
º¸´Ù Ä¡¹ÐÇÏ°Ô ¾ÆÆÄŸÀÌÆ® ÃþÀÌ Çü¼ºµÇ´Â °æÇâÀ» º¸¿´´Ù
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Bioactive glass-ceramics can form tight chemical bonds with bone, however, their
poor mechanical properties may limit their clinical applications. Alumina ceramics show
good biocompatibility and high strength but can`t form chemical bonds with bone.
Hydroxyapatite ceramics and bioglass form chemical bonds with bone but their strength
and fracture toughness are relatively low. Glass ceramics containing apatite and
wollastonite crystals can form tight chemical bonds with bone and show relatively high
strength and fracture toughness. Bioactive glass-ceramics toughened by alumina and
tetragonal zirconia polycrystals show relatively high mechanical strength. Both bioactive
and high strength ceramics will be widely applicable to many clinical applications. In
this study, bioactive glass-ceramics toughened by alumina and zirconia polycrystals
were fabricated, and crystallization behavior, biaxial flexure strength, fracture toughness,
and bioactivity were measured.
The results obtained were summarized as follows;
1. The major crystaline phase in the matrix glass were observed to be apatite,
wollastonite, and ¥â -TCP.
2. Biaxial flexure strength and fracture toughness values were more improved by the
dispersion toughening of alumina and zirconia, and the improvement of mechanical
strength was more higher in the dispersion toughening of zirconia than that of alumina.
3. The bioactivity, which was evaluted from apatite formation in the simulated body
fluid, was higher in the dispersion toughening of ZrO2 than that of
Al2O3.

Å°¿öµå

bioactive glass-ceramic; Biaxial flexure strength; fracture toughness; Bioactivity;

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