J Korean Acad Conserv Dent.  2008 May;33(3):224-234. 10.5395/JKACD.2008.33.3.224.

Effect of the application time of self-etching primers on the bonding of enamel

• Jin CH
• Cho YG
• Kim SM
• Lee MS

• KMID: 2175985
• DOI: http://doi.org/10.5395/JKACD.2008.33.3.224

Abstract

The purpose of this study was to compare the normal and two times of application time of six self-etching primers applied to enamel using microshear bond strength (uSBS) test and the finding of scanning electronic microscope (SEM). Crown of sixty human molars were bisected mesiodistally and buccal and lingual enamel of crowns were partially exposed and polished with 600 grit SiC papers. They were divided into one of two equal groups subdivided into one of six equal groups (n = 10) by self-etching primer adhesives. After the same manufacture's adhesive resin and composites were bonded on the enamel surface of each group, the bonded specimens were subjected to uSBS testing and also observed under SEM. In conclusion, generally two times of primer application time increased the enamel uSBS, especially with the statistical increase of bond strength in adhesives involving high-pH primers.

Keyword

Application time; Self-etching primers; Microshear bond strength; SEM; Enamel

MeSH Terms

Adhesives
Crowns
Dental Enamel
Electronics
Electrons
Humans
Molar
Adhesives

Figure

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  Figure 1 Microshear bond test of specimen.

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  Figure 2 SEM micrographs of interface of enamel (E) and composite resin (R) treated with Tyrian SPE for normal application time (20 s) and two times of application time (40 s). Close adaptation was seen between enamel and resin in both groups, TY group (A) and TY-2 group (B)(× 4,500).

• 

  Figure 3 SEM micrographs of interface of enamel (E) and composite resin (R) treated with Contax for normal application time (20 s) and two times of application time (40 s). Close adaptation was seen between enamel and resin in both groups, CO group (A) and CO-2 group (B)(× 4,500).

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