J Adv Prosthodont.  2011 Sep;3(3):126-131. 10.4047/jap.2011.3.3.126.

Curing efficiency of various resin-based materials polymerized through different ceramic thicknesses and curing time

• Lee JW
• Cha HS
• Lee JH

• KMID: 2118120
• DOI: http://doi.org/10.4047/jap.2011.3.3.126

Abstract

PURPOSE
The aim of this in vitro study was to examine the curing efficiency of various resin-based materials polymerized through ceramic restorations with 3 different thicknesses. Curing efficiency was evaluated by determining the surface microhardness (VHN) of the resin specimens.
MATERIALS AND METHODS
Four kinds of resin materials were used. Z350 (3M ESPE Filtek(TM) Z350: A2 Shade), Z250 (3M ESPE Filtek(TM) Z250: A2 Shade) and Variolink(R) II (VL: Ivoclar vivadent, base: transparent) either with or without a self-curing catalyst (VLC: Ivoclar vivadent, catalyst: low viscosity/transparent) were filled into the silicone mold (10 mm diameter, 1 mm thick). They were cured through ceramic discs (IPS e.max Press MO-0 ingot ivoclar vivadent, 10 mm diameter, 0.5, 1 and 2 mm thicknesses) by LED light-curing units for 20 and 40 seconds. Vicker's microhardness numbers (VHNs) were measured on the bottom surfaces by a microhardness tester. Data were analyzed using a 3- way analysis of variance (ANOVA) at a significance level of 0.05.
RESULTS
The thickness of ceramic disc increased, the VHNs of all four resin types were decreased (P<.05). The mean VHN values of the resins light cured for 40 seconds were significantly higher than that of LED for 20 seconds in all four resin materials (P<.05). VLC showed significantly higher VHN values than VL regardless of other conditions (P<.05). Z350 and Z250 showed higher values than VL or VLC (P<.01).
CONCLUSION
Thinner ceramic disc with increased curing time resulted higher VHN values of all resin materials. The use of a catalyst produced a greater hardness with all polymerization methods. Restorative resin materials (Z350, Z250) showed higher VHN values than resin cement materials (VL, VLC).

Keyword

Dental ceramic; VHN; Resin-based material; Light curing

MeSH Terms

Acrylic Resins
Ceramics
Composite Resins
Fungi
Hardness
Light
Polymerization
Polymers
Polyurethanes
Resin Cements
Silicones
Waxes
Acrylic Resins
Ceramics
Composite Resins
Polymers
Polyurethanes
Resin Cements
Silicones
Waxes

Figure

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  Fig. 1 Schematic drawings of the test specimen set-up.

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  Fig. 2 Graph of the mean square microhardness according to porcelain thickness (Light curing time for 20 seconds).

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  Fig. 3 Graph of the mean square microhardness according to ceramic thickness (Light curing time for 40 seconds).

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