Microleakage and shear bond strength of orthodontc brackets bonded to hypomineralized enamel following different surface preparations
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Microleakage and shear bond strength of orthodontc brackets bonded to hypomineralized enamel following different surface preparations

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Microleakage and shear bond strength of orthodontc brackets bonded to hypomineralized enamel following different surface preparations

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dc.contributor.author Shahabi, Mostafa es
dc.contributor.author Ahrari, Farzaneh es
dc.contributor.author Mohamadipour, Hamideh es
dc.contributor.author Moosavi, Horieh es
dc.date.accessioned 2014-05-22T10:06:47Z
dc.date.available 2014-05-22T10:06:47Z
dc.date.issued 2014 es
dc.identifier.uri http://hdl.handle.net/10550/35393
dc.source Shahabi, Mostafa ; Ahrari, Farzaneh ; Mohamadipour, Hamideh ; Moosavi, Horieh. Microleakage and shear bond strength of orthodontc brackets bonded to hypomineralized enamel following different surface preparations. En: Journal of Clinical and Experimental Dentistry, 2014, Vol. 6, No. 2: 110-115 es
dc.subject Odontología es
dc.subject Ciencias de la salud es
dc.title Microleakage and shear bond strength of orthodontc brackets bonded to hypomineralized enamel following different surface preparations es
dc.type info:eu-repo/semantics/article en
dc.type info:eu-repo/semantics/publishedVersion en
dc.subject.unesco UNESCO::CIENCIAS MÉDICAS es
dc.description.abstractenglish Objectives: This study investigated the effects of several conditioning methods on shear bond strength (SBS) and microleakage of orthodontic brackets bonded to demineralized enamel. Study Design: One hundred premolars were selected and immersed in a cariogenic solution for 12 weeks. The teeth were randomly assigned into 5 groups. In groups 1 and 2, the teeth underwent acid etching for 30 and 120 seconds, respectively. In group 3, a combination of laser and acid etching was employed. A self-etch primer (SEP) was applied in group 4 and in group 5, the teeth were exposed to acidulated phosphate fluoride (APF) for 4 minutes before etching. After bracket bonding, the teeth were immersed in methylen blue for 12 hours and then were mounted in acrylic resin. SBS was determined with an Instron Universal Testing Machine and the amount of microleakage under the brackets was assessed under a stereomicroscope. Results: The lowest SBS was related to the SEP group and the highest one was observed in the specimens prepared by APF+acid etching. There was a significant difference in SBS (p=0.009), but not in microleakage (p=0.971) of the study groups. The SBS of the specimens treated with SEP was significantly Lower than the other groups, which were not significantly different from each other. The SEP group displayed a higher frequency of bond failure at the enamel-adhesive interface. Conclusion: Enamel preparation with SEP provided the lowest SBS among the groups. All groups showed some degree of microleakage. There was no significant correlation between SBS and microleakage. es

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