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document
An in vitro comparative analysis : scanning electron microscopy of dentin/restoration interfaces . One hundred maxillary premolar teeth were randomly allocated to ten groups . Each group was restored with one of ten different restorative techniques . The teeth were stored in deionized water for 7d prior to longitudinal sectioning in a mesio-distal plane . Following sectioning , ten specimens from each group were chosen at random from the 20 available sections . The sectioned surfaces were polished using 600-grit SiC abrasive paper and etched for 10 s with 50 % phosphoric acid to remove the smear layer produced by sectioning . Five tooth sections from the dentin bonding resin groups were allowed to dry at 20 degrees C for 24h . The glass ionomer-based groups were reimmersed in deionized water during this period . The remaining five sections from each group were replicated using an addition-cure vinyl polysiloxane impression material and an epoxy resin . A comparison was made of the sections and the replicas . All tooth specimens were sputter-coated with gold for 4 min and examined using a scanning electron microscope . Replicas were gold-coated for 3 min . Different tooth/restoration interfaces , associated with different materials , were observed . A marked difference between the replicas and tooth sections was observed for glass ionomer-based restorations but not for resin-based bonding systems . Representative samples of replicas and specimens are shown , and the significance of the observed differences is discussed .
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Intervention_Physical
ten different restorative techniques
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Intervention_Physical
600-grit SiC abrasive paper
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Intervention_Physical
addition-cure vinyl polysiloxane impression material
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Intervention_Physical
epoxy resin
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Intervention_Physical
sputter-coated with gold
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Intervention_Physical
glass ionomer-based restorations
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Intervention_Physical
resin-based bonding
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Participant_Sample-size
One hundred