839 A new class of Fillers for Dental Composites

Friday, March 23, 2012: 2 p.m. - 3:15 p.m.
Presentation Type: Poster Session
D. KRUBER1, T. DOEGE1, and R. GOEBEL2, 1Quarzwerke GmbH, Frechen, Germany, 2Friedrich Schiller Universitšt, Jena, Germany
Objectives:

Development of new filler materials for light curing dental composites

Methods:

The formulations were prepared containing Bis-GMA (2,2-bis[4-(2-hydroxy-3-methylacryloxypropoxy)-phenyl]propane associated with TEGDMA (2-methyl-2-propenoic acid). The photoinitiatior system was composed of camphorquinone  and 2-(dimethylamino)ethyl methacrylate. Fillers were added up to the filling degree described.

The preparation of dental composites using Quarzwerke MICROSPAR® filler took place by mixing all parts by hand to a visible bubble free paste.

Results:
flexual bond strength [MPa] shear bond strength [MPa] vickers hardness [HV 5-20] Roughness4); Ra [µm]
reference 0.7 µm 1) 115,6 22,6 47,0 -
reference 1.0 µm 2) 145,0 31,3 54,4 -
MICROSPAR 1351-980 MST 144,0 19,7 48,5 0,05
MICROSPAR 1351-900 MST 212,0 29,7 53,9 0,05
MICROSPAR 1351-600 MST 205,0 28,2 51,3 0,05
MICROSPAR mixture3) 203,0 31,3 47,6 0,05
1) GM 39923 UF 0.7; 6,0% Methacrylsilane
2) GM 27884 UF 1.0; 4,6% Methacrylsilane 
3) Mixture MICROSPAR 1351-900 MST / MICROSPAR 1351-600 MST; 40 wt% / 60 wt%
4) polishing methode
1st step: roughening via hard metal grinder
2nd step: CompoMaster Coarse (Shofu)
3rd step: CompoMaster  (Shofu)
4th step: DirectDia Paste; Super Snap Buff Disk  (Shofu)

Conclusions:

  • Compared to the common dental fillers based on Sr-Glasses and Ba-Glasses respectively, MICROSPAR® systems show in the mechanical data similar or better performance
  • All MICROSPAR® systems show very good cure depth
  • The linear shrinkage values are between 1.4% and 1.7%
  • High filling degrees are practicable
  • Good processability at high filler levels is ensured
  • Highly transparentàno influence to the color adjustment
  • Excellent polishing behavior of resulting fillings

Keywords: Acrylics, Composites, Dental materials, Filler and Polymers
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