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- W2375367829 abstract "Objective:To determine the best etching time for primary teeth enamel by investigating the effects of different etching times on morphology of enamel surface and interface,shear bond strength(SBS) of composite-resin to enamel.Methods:12 primary teeth were randomly divided into four groups.Labial enamel surfaces were etched for 15,30,60,120 s in each group and then were observed by SEM.Another 48 primary teeth were divided and etched in the same way.A Light-cured resin composite restorations with an inner diameter of 4 mm and a depth of 2 mm was made on the etched enamel surface according to the manufacturer's instruction.40 specimens of them were used to measure bond strength with universal testing machine.Another 8 teeth adhered to composite resin were cut vertically through the resin-enamel interfaces and were observed by SEM.Results: SEM observation indicated that enamel surface became uniform fish scaled when they were etched for 30 s and 60 s.But a little fish scaled structures were emerged when primary enamel were etched for 15 s.Scaled structure disappeared and dentin tubule exposed when they were etched for 120 s.The mean SBS(MPa)were: 5.34(15 s),10.59(30 s),12.22(60 s),3.73(120 s).SEM observation of interface morphology showed long tag-like extensions penetrating into the decalcified enamel in both 30 s and 60 s groups.There were no tag-like extensions in 15s and 120 s groups.Conclusion: The best etching time for primary teeth enamel are 30 s to 60 s." @default.
- W2375367829 created "2016-06-24" @default.
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- W2375367829 date "2008-01-01" @default.
- W2375367829 modified "2023-09-27" @default.
- W2375367829 title "Effects of different etching times on morphology of primary teeth enamel surface and composite resin-enamel shear bond strength" @default.
- W2375367829 hasPublicationYear "2008" @default.
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