|
Additives | Comments | References |
|
Glass fibers, particles or whiskers, quartz, and silica | Decreased mechanical properties after storage in water | Guo et al. 2012 [72] |
Not strong enough | Lin et al. 2008 [64] and |
Not radiopaque and not strong enough | Mirsasaani et al. 2011 [4] |
Reduced radiopacity |
Cruvinel et al. 2007 [117] |
Polyethylene fibers | Poor interaction between the fibers and the matrix | Geerts et al. 2008 [10] |
Alla et al. 2013 [13] |
Ultrahigh molecular weight polyethylene fibers | Impractical for the dental laboratory practice | Uzun et al. 1999 [42] |
Nylon fiber | Fiber pullout from the matrix | Lin et al. 2008 [64] |
Carbon and Kevlar fibers | Aesthetic unsatisfactory and poor adhesion with acrylic resin | Tandon et al. 2010 [1] and Alla et al. 2013 [13] |
Complicated etching process required to improve their incorporation into PMMA | Uzun et al. 1999 [42] |
Metal wires and metallic fillers | Poor adhesion between wires and the acrylic resin |
Mowade et al. 2012 [37] and Alla et al. 2013 [13] |
Aesthetic unsatisfactory | Young 2010 [26] |
PA and sapphire whiskers, fibers | Break up the homogeneity of acrylic resin | Mowade et al. 2012 [37] |
ZrO2 | Not compatible with the matrix | Kitayama et al. 2009 [7] |
Insufficient radiopacity |
Carrodeguas et al. 2003 [33] |
BaSO4 | Adverse effect on mechanical properties and color instability | Young 2010 [26] |
Comonomers containing rubber phase | Increased cost | Mowade et al. 2012 [37] |
Deterioration of flexural properties | Jagger et al. 1999 [2] |
Reduction of the resin's translucency | Jung et al. 1998 [28] |
Comonomers containing heavy metals | Poor mechanical properties and aesthetic unsatisfactory | Young 2010 [26] |
|