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Effect of different light
curing systems on the shear bond strength of resin-modified
glass ionomer cement and polyacid-modified composite resin
Oya Bala, Hacer Deniz Arisu*, Bagdagul Helvacioglu Kivanc
and Sara Samur
University
of Gazi, Faculty of Dentistry, Department of Operative
Dentistry and Endodontics, Ankara, Turkey.
*Corresponding author. E-mail:
hdenz@yahoo.com,
hacer@gazi.edu.tr.
Tel.: + 90 532 6461244, + 90 312 3802405. Fax: +90 312
2239226.
Accepted
16 June, 2009 |
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The aim of this study was to determine in vitro shear
bond strength of resin-modified glass ionomer cement (RMGIC)
and polyacid-modified composite resin (PMCR) polymerized
with conventional halogen light curing unit (LCU) or light
emitting diode (LED). Twenty-four mandibular molar teeth
were used. Enamel was removed from buccal and lingual
surfaces of the teeth to expose superficial dentin. Teeth
were embedded in acrylic resin molds. Plastic rings were
placed on the buccal and lingual-exposed superficial dentin.
The teeth were then randomly divided into four groups. The
study groups were designed as: Group A: PMCR, polymerized
with conventional halogen LCU, Group B: RMGIC, polymerized
with conventional halogen LCU, Group C: PMCR, polymerized
with LED LCU, Group D: RMGIC, polymerized with LED LCU. The
shear bond strength for each specimen was measured with a
universal testing machine at a cross-head speed of 0.5
mm/min. Data were analyzed with ANOVA and Turkey tests at a
preset α of 0.05. Values in Group 1 were significantly lower
than in Groups 2, 3 and 4 (p < 0.05). There was no
significant difference between Groups 2, 3 and 4 (p > 0.05).
The shear bond strength values of LED LCU were significantly
higher than that of halogen LCU (p < 0.05). The shear bond
strength values of RMGIC were significantly higher than that
of PMCR (p < 0.05).
Key
words:
Resin
modified glass ionomer cement, polyacid modified resin
composite, halogen, light emitting diode, shear bond
strength. |
