|
| 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] |
|
